Author Topic: racing my 66 Comet  (Read 12463 times)

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Jim Comet

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racing my 66 Comet
« on: July 24, 2019, 10:43:46 AM »
I am running my Comet at Grove Creek this weekend and to play off of the guess my hp threads, how about guess my ET? I will post my results on Sunday.

Performance Summary:

   1st time out with new motor and car set up: June 2019
      1/8 mile ET: 7.559               1/8 mile MPH: 95.26
      60 foot time: 1.54
      Track: Grove Creek raceway, MN

    40 passes later/car is getting sorted out: October 2019
      1/8 mile ET: 6.811               1/8 mile MPH: 99.79
      60 foot time: 1.463
      Track: Rock Falls raceway, WI

      1/4 mile ET: 10.74               1/4 mile MPH: 124.50
      60 foot time: 1.463
      Track: Rock Falls raceway, WI


Vehicle Use: Bracket racing strip only
(For example, occasional strip use, street/strip with regular strip use, or strip only)

Vehicle Specifications:

Model Year: 1966

Model: Comet

Style:2 door hard top, subframe connectors and 8 point roll bar.

Engine Details : See my guess my horsepower post for specifics: 416ci dyno'd at Jay Browns 600hp@6800rpm

Transmission: C6 fully rollerized. Low ratio kit. 1st/2.72, 2nd/1.54 and 3rd 1:00 NO trans brake. Will leave off of 2 step.

Torque converter details (if automatic): ATI 5000? stall, Spec'd by Blair Patrick

Clutch details (if manual):

Driveshaft: 3" stock big block shaft w/upgraded yoke.

U-joints: 1330/1350 performance joints

Rear end type: 9 inch Yukon aluminum center.

Differential type: 35 spline PEM spool

Gear Ratio: 4.11
 
Axles:35 spline Quick performance

Front tires:Moroso 6.5-15?

Front wheels: Centerline Convo pro: 15x4

Rear tires: M/T slicks 28x9

Rear wheels: Centerline Convo pro 15x8

Front suspension information:custom home made. similar to stock. but shock towers removed. w/Afco single adjustable shocks.

Rear suspension information: 2" leaf springs with home made Caltrac style bars. poly spring bushings. Caltrac single adjustable shocks.

Ready-to-race vehicle weight, including driver:3560 lbs, fiberglass bumpers, fenders and deck lid.
« Last Edit: February 23, 2022, 09:32:05 PM by Jim Comet »

6667fan

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Re: guess my 1/8 mile ET?
« Reply #1 on: July 24, 2019, 11:16:58 AM »
I like the format here but cannot supply a guess.
An observation however. I will be surprised if you get to your peak hp rpm in the traps. That is a tall tire combined with the 4.11s.
Do you have any data loggers on board besides eyeballs?

Good luck and have fun!
JB
JB


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Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’

e philpott

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Re: guess my 1/8 mile ET?
« Reply #2 on: July 24, 2019, 11:30:46 AM »
that's a lot of First gear with 5K stall , if it dead hooks should be a blast

My guess 6.9?'s at 102-ish MPH if it hooks

gt350hr

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Re: guess my 1/8 mile ET?
« Reply #3 on: July 24, 2019, 11:39:13 AM »
   6.60 @ 108 w 1.42 60' hope you go faster than that though.
      Randy

blykins

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Re: guess my 1/8 mile ET?
« Reply #4 on: July 24, 2019, 12:14:44 PM »
7.20.
Brent Lykins
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Stangman

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Re: guess my 1/8 mile ET?
« Reply #5 on: July 24, 2019, 12:29:39 PM »
6.78 @ 102.80. I would think your car weighs less, do you run a full interior? Still sticking with my guess my car is 250 lbs less but I have 50-60 HP less and I run 7.08. Good luck!!!
« Last Edit: July 24, 2019, 12:33:36 PM by Stangman »

BattlestarGalactic

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Re: guess my 1/8 mile ET?
« Reply #6 on: July 24, 2019, 12:55:01 PM »
Lack of gear(only 4.11) will slow the 60ft down a touch even with the loose converter(my opinion, may be totally wrong).  That is the same tall tire I run(but 10.5")

You're 250# light of my car/driver, and 25 hp down.

I think you'll be 7.0's, but MPH will be questionable.  It will likely not pull hard until after the 1/8 mile.  I run 96-97 mph commonly.  I think you will be a couple under that.  (my guess, again might be totally off).

60ft?  Once you get the shocks set, it could get really good>  How lucky you are the first day?  I think the 4.11 gear will still be a hindrance.   Mid 1.5's,
Larry

Jim Comet

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Re: guess my 1/8 mile ET?
« Reply #7 on: July 24, 2019, 02:08:47 PM »
I do have front race seats, carpet, factory interior trim panels and the rear seat in it. Jim

JamesonRacing

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Re: guess my 1/8 mile ET?
« Reply #8 on: July 24, 2019, 02:43:43 PM »
First time out with the car and combination?  7.90.  Should go 7.00 when you get the bugs worked out.
1966 Fairlane GT, Silver Blue/Black 496/C4 (9.93@133)
1966 Fairlane GT, Nightmist Blue/Black 465/TKO (11.41@122)
1966 Fairlane GTA Conv, Antique Bronze/Black, 418EFI/C6
1966 F250 C/S, Rangoon Red, 445/T19
1965 Falcon Futura 4-door, Turquoise, EF! Z2363/4R70W

gt350hr

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Re: guess my 1/8 mile ET?
« Reply #9 on: July 24, 2019, 03:10:56 PM »
   You have the same low gear ratio as a 4.57 with a stock C6 That along with a 5,000 stall convertor WILL leave well. My combination runs 7.0s @ 98 ( 1.48-1.50 60') with 75 less HP and 600 less lbs. You have MUCH more torque than my 331ci SBF . if your corrected altitude is around 1,000 or less you will run good numbers. If it's above that you might only run 6.90s. My '67 Ranchero with a 408W ( 480 hp) C4 with stock 11" convertor , 4.30 gears and 275 drag radials went 8.0s through the mufflers  right off of the street and the weight is at least what yours is. You will be over a second faster with more , more , more.
   Randy

thatdarncat

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Re: guess my 1/8 mile ET?
« Reply #10 on: July 24, 2019, 03:43:49 PM »
   .... if your corrected altitude is around 1,000 or less you will run good numbers. If it's above that you might only run 6.90s...

Actual elevation of Grove Creek is around 1140’, forecast for Saturday is for a high of 90 and pretty humid, so corrected altitude will be much higher. Spring & fall we can get some pretty good air days occasionally, especially when the temps are in the 30’s. A couple times at Grove Creek we’ve had to wait in the morning for the water to thaw in the burnout box before we could race lol.
Kevin Rolph

1967 Cougar Drag Car ( under constuction )
1966 7 litre Galaxie
1966 Country Squire 390
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1972 Gran Torino wagon
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jayb

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Re: guess my 1/8 mile ET?
« Reply #11 on: July 26, 2019, 05:16:32 PM »
I'm going to guess 7.45, but I hope it goes faster...
Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
- 1969 Shelby Clone, Drag Week 2015 Winner Modified NA (Average 8.98 @ 149), 585" SOHC

   

Jim Comet

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Re: guess my 1/8 mile ET?
« Reply #12 on: July 26, 2019, 09:10:04 PM »
Thanks everyone, I am loaded and set to head out. Car starts and runs flawlesslay in the driveway ;D Hopefully it works tomorrow. My guess is 7.20 by the end of the the night. Jim

thatdarncat

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Re: guess my 1/8 mile ET?
« Reply #13 on: July 27, 2019, 01:42:16 PM »






« Last Edit: July 27, 2019, 01:47:04 PM by thatdarncat »
Kevin Rolph

1967 Cougar Drag Car ( under constuction )
1966 7 litre Galaxie
1966 Country Squire 390
1966 Cyclone GT 390
1968 Torino GT 390
1972 Gran Torino wagon
1978 Lincoln Mk V

Jim Comet

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Re: guess my 1/8 mile ET?
« Reply #14 on: July 27, 2019, 06:25:40 PM »
What a day, the good, the bad and the ugly. Our day started when I drove the motorhome towing my car through a dip in the parking lot where I used to park 12 years ago. Parking here allows the RV to sit on level ground while the trailer tires are in the dip which allows me to load and unload my car without using ramps. WELL the dip is now deeper and the bumper of my RV got hung up and I was stuck. Fortunately a fellow racer unhooked his trailer and gave me a tug out. OK unload the car and get to tech. Wait these new rear leaf springs I put on took a set while I towed to the track that was about 1 inch lower than they were before. Now my 29.5x9 slicks are ripping my wheel lip mouldings off. No way to run these tires today. Fortunately my brother is on his way to watch and happens to have a pair of 28x9 slick with him that I can use. We mount the smaller slicks and are in business. First pass I launch pretty hard and lift part way through the run since this is a brand new car setup. 1.71 60ft and 8.0 @83mph. Ok for a test hit. Nest pass I launch #3000rpm (as high as my brakes will hold) and get a 1.71 60ft time and 7.61 @93mph. Not what I hoped for but the car drives great. I make one more pass with the same results and decide to hand the driving to my son. He has not driven a drag car so he took his first pass easy and got a 7.96 @82mph with a 1.73 60ft time. I then decided to check the timeing and found we were only running 28 degrees advance. I bump it up to 33 and send the boy back out. He runs a 7.94 becuase he had to lift but he also had a 1.54 60ft time. Through all these runs we have been having shift light and rev limit issues do to a wacky ignition box which will be replaced. My sons next pass and the last one of the day was another 1.54 60ft time and a 7.56 ET @95.26mph. We went back to cool the car and when we went to check air pressure the right rear slick was flat. These slicks were not screwed on and while it didn't appear to rotate on the rim the valve stem on the tube had been torn. That ended our day before we could address our shifting and rev limit issues. So my best ET was a 7.559 @93MPH and a 1.71 60ft. If we can put the 1.54 60ft times with better shifts I believe we will be seeing 7.20-7.30 pretty easily. And it was 87 degrees today.  I am going to buy some new better sized slicks an give it another go. Engine ran great. Thanks Blair. Also thanks to Steve and Kevin for thier help. Its much appreciated. Jim

Posi67

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Re: guess my 1/8 mile ET?
« Reply #15 on: July 28, 2019, 11:32:20 PM »
First rule of running tubes in your Slicks is "don't run tubes". if you insist the rim screws are a must as you've found out. The tire will turn and tear off the valve stem. I've never run tubes and normally my tires turn about an inch then stop. Swap side to side and it goes back where I started. This isn't gospel and I'm convinced the type/brand of wheel makes a difference.

That aside, congrats on getting out and making some runs. Some work on the 60' times and I think you'll be having fun. I don't/won't run 1/8th mile so it will be interesting to see how the car runs full 1/4. 

Stangman

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Re: guess my 1/8 mile ET?
« Reply #16 on: July 29, 2019, 06:32:54 AM »
Hey Posi 67 just curious as to why you wont run 1/8 mile? Dont want to hyjack post.

gt350hr

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Re: guess my 1/8 mile ET?
« Reply #17 on: July 29, 2019, 11:29:43 AM »
  Jim,
    The 60 and MPH are better than the ET which "I" feel is off by about .3. My idea is it's "laying down" after the launch , but the horsepower is strong enough to run good MPH.
   Posi67 is right about tubes. I have 10x28 Goodyears and haven't run tubes for over twenty years. My car likes 14-15psi and "I" don't use screws . My 1.48-1.50 60s haven't shown any slippage on the rim , something I check every time I look at the air pressure in the tires.
   Not bad times for the heat ( 2-3 tenths quicker in cooler weather for sure).
  Randy

Jim Comet

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Re: guess my 1/8 mile ET?
« Reply #18 on: July 29, 2019, 12:04:37 PM »
We had rev limit and shift point issues on all runs. Our shifts were off by 500 plus rpm's and we were bouncing off the rev limiter which we were unable to raise above 6500 rpms. I am pretty sure that when I fix these, it will run consistent low sevens.

gt350hr

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Re: guess my 1/8 mile ET?
« Reply #19 on: July 29, 2019, 03:12:24 PM »
  Agreed now that I see what you were fighting! Good luck , it will go faster with a few more tweaks.

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Re: guess my 1/8 mile ET?
« Reply #20 on: July 29, 2019, 08:01:27 PM »
The M/T 28.5's will be coming your way on 8 inch wheels (4/4) ....

Jim Comet

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #21 on: August 10, 2019, 09:40:01 PM »
Well we figured out the shift light, rev limit and 2 step today. I also installed a one wire 140 amp alternator so no more charging issues either. Here is a time slip with the numbers (car #115). Jim
« Last Edit: August 10, 2019, 09:42:17 PM by Jim Comet »

Stangman

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #22 on: August 11, 2019, 05:00:21 PM »
Nice!!! Your really starightning things out.

WerbyFord

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #23 on: August 11, 2019, 09:08:50 PM »
Great story with a great timeslip. Once again I missed the prediction - spending too much time Gonkulating NHRA history on HAMB.
So many Mouse combinations, all the NHRA nationals ended up infested with rodents.

First I had to hunt for the engine link, I forgot all about having already read it. Too much going on.
http://fepower.net/simplemachinesforum/index.php?topic=7119.0;all

On your 1st runs (July 27) the comment about the car laying down seems just right per the Gonkulator - good 60ft, good 1/8 MPH, slow 1/8 ET.
Gonkulator said about 7.10 ET. I used an extra full second on the 1-2 shift and that brought things in line, likely not what really happened but somewhere around the 1-2 shift the car fell asleep and then woke up again.
I calculated a DA=2643 ft on your July 27 runs, or about 95% power vs the typical weather I assume in the Gonkulator.

On your next runs (Aug 10) I had to have everything about "right on" in the Gonkulator and then things lined up pretty good:
1.48
4.41
6.89 at 98.6
10.88 at 122.97 (or 123.89mph measured the "old way").
I get a DA=2046 ft for that day, or abou 97% power vs a typical Gonkulator run.

SAE Gross Sea Level Air (ok stop laughing everybody) is about 4% better than what I use for Gonkulator air or about 7% better than the air you had. Here is what the Gonkulator gets for your car on an SAE Day if you can ever find one:
1.46
4.32
6.75 at 100.6
10.66 at 125.4 (or 126.4 out the back door)
A Magazine-Worthy story for sure.


NOTE: "Gonkulator Air" as I normally use is my guess for my 1st trip to Milan back in 1975:
64 F
50% RH
29.92 Barometer
500 ft elevation
1000 ft DA
100% Power (I like to think of air in terms of %Power instead of DA, so an SAE Day is 104% Power, Jim's day above is 97% Power, etc. Since 3% power is about 1% trap speed, it makes the conversions pretty easy.)
Funny I remember that 1st trip to Milan like yesterday, a little chilly crawling under the car on the entry road in the morning to unbolt the headers, cold enough my girlfriend stayed in the car to keep warm and fell asleep (she woke up in a hurry). Nice day later on, I didn't get hot so I know it was in the 60s.
About the best Michigan Summer race weather you could hope for.
So when I give a generic "gonkulator result" unless I know the track & weather, that's what I'm using.
« Last Edit: August 11, 2019, 09:16:49 PM by WerbyFord »

gt350hr

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #24 on: August 12, 2019, 09:46:56 AM »
 Nice going Jim matches what I suggested in reply #9. Cooler weather later in the year could be worth a couple more tenths , getting you closer to my original 6.60s ( 1/8th) prediction.

Stangman

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #25 on: August 12, 2019, 01:12:04 PM »
Or my 6.78.  8)

BattlestarGalactic

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #26 on: August 12, 2019, 01:22:08 PM »
Glad to see you got it working well!  The 1/8 and 1/4 numbers are very in line.  Nice 60ft.
Larry

Jim Comet

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #27 on: August 12, 2019, 01:29:08 PM »
My son is shifting @ 6700 rpm. Based on the dyno info, it would probably run faster if he were to shift @7100-7200rpm but I am still getting used to spinning a motor this high. Jim

e philpott

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #28 on: August 12, 2019, 01:59:34 PM »
Reply #2 my 6.9? at 102 if it hooks , lol

BattlestarGalactic

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #29 on: August 12, 2019, 02:54:58 PM »
Nobody but you can decide at what to shift it at.  If you want to do fast, shift it higher.  If you are happy with it...shift it at 6700.
Larry

gt350hr

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #30 on: August 12, 2019, 03:04:38 PM »
  Sometimes the 1-2 can be shorter than the 2-3 and see a difference. I short shift mine by 500 rpm on the 1-2 and it likes it. More runs will let you know what it likes best. Great numbers , more to come for sure.
    Randy

CaptCobrajet

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #31 on: August 14, 2019, 08:04:58 AM »
Yes, the 1-2 should be about where peak power is on the dyno sheet.  The 2-3 about 500 past peak.......but, as BSG said, you don't have to shift it that high all the time.  My vote is to get your 29" tires back, put a 5.00 gear in it, and then short shift it for some 6.40s and 10.30s..........just a thought.:)

That little baby camshaft and SPP heads seem to do pretty good in that combo.  I think you did have bad gas when you can it at Jay's, because it is going to end up going faster than the dyno numbers would have indicated at your weight, with a C6 trans.  There is .25 in the bank if you ever decide to put a C4 in there down the road.
« Last Edit: August 14, 2019, 08:12:09 AM by CaptCobrajet »
Blair Patrick

6667fan

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Re: guess my 1/8 mile ET?updated w/ 1/4 mile stats
« Reply #32 on: August 18, 2019, 07:17:37 PM »
That’s awesome Jim. You must be thrilled. Congrats on getting in the 10s with it.

JB
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482 cid 636/619.
Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’

Jim Comet

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Re: switching from 850 to 1100 cfm carb.
« Reply #33 on: June 25, 2021, 09:00:00 PM »
So after some discussion with Blair, he sent me a custom built 4150 for me to try when I get out on the weekend of the 4th. I either need to slow to 11.0 or speed up to the 10.50 class. The car with my plain Jane 850 dbl pumper has been running consistent 10.7*'s 1/4 mile ET's. He also sent 2 of his custom spacers to try (1" and 2"). The car has been 60 footing very consistently at 1.47 to 1.48 no matter what the timing was changed to (28 to 31deg) trying to slow the car. I will post how the new 1100 cfm carb runs compared to my previous setup. Jim

Jim Comet

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Re: switching from 850 to 1100 cfm carb.
« Reply #34 on: September 29, 2021, 08:27:54 PM »
Hey all, this post maybe should be how not to tune a car. This spring, Blair was nice enough to send me a custom 1100 cfm carb to test (vs my basic 850 dbl pumper) to see if it would get me closer to my 10.50 target ET. This test was at BIR on a very hot 4th of July. It was so hot they actually shut down racing for the first time ever due to hot track temps. They put water on it to cool it and later in the day got it dry and resumed racing. Due to the heat, Blair suggested I dial in a little more timing. Previous runs had my trap speeds from 122-123mph. With the 1100cfm and more timing I was now running 124-125mph trap speeds. Unfortunately my 60ft times were now in the low 1.50s instead of the 1.45-1.47 I had been running. I chalked it up to the extreme heat at the time. I made 10 passes with the 1100 carb. during those passes I tried both jetting and suspension changes to try and improve my times, but they made no difference. I wanted to verify if it was the carb or the timing that improved my trap speed so after the 10 passes with the 1100, without making any other changes, I put my old 850 on and the car ran the exact same times and trap speeds as it had with the 1100 carb. Based on that I decided to send the carb back to Blair and have since been focused on slowing the car to run the 11.0 index. I even have run a 780 vacuum secondary carb. With the secondary's locked out the car runs 11.60's on 2 barrels. I drilled some holes in my vacuum diaphragm rod and can control how far the secondary's open by moving a hair pin to higher or lower holes. This seemed to work pretty well, although this winter I think I may install a changeable restrictor plate setup to control my ET's. I like the thought of that better as the carb will be wide open and running fully on the mains and not stuck running off the transition circuits on the rear 2 barrels. Then I can just run my 850 dbl pumper again and change restrictor plates as needed to dial the car in. One thing for sure is the motor likes more timing than we initially thought. Blair had us run 32 degrees (locked out dist) for my dyno test at Jay's where the motor made 600hp. I think with the switch from the Harland Sharp rockers to the T&D's and running more timing the motor may be making more power as I am now consistently running trap speeds of 125-127mph. My new problem now is, even with new slicks, I cannot get my 60ft times back under 1.50. Sorry for the long rambling post. I love my BP motor. It is running stronger all the time. Jim 
« Last Edit: September 30, 2021, 06:47:14 AM by Jim Comet »

Jim Comet

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Re: switching from 850 to 1100 cfm carb.
« Reply #35 on: February 23, 2022, 09:31:06 PM »
Well for this 2022 season I have decided to make a couple of changes. First is I am going to try some Hooker header collectors. The collectors I had been running both on Jays dyno and at the track were merge collectors and had a 2 1/8 - 2 1/4 choke. When I revved the car up before bolting the collectors on, it shot the collectors across my shop. With this in mind I am going to try a conventional Hooker 2" to 3 1/2 collector and see if that helps. My uneducated guess says that back pressure may have been causing my wonky AFR readings above 6500rpms on Jays dyno. I also have a 1050 annular carb to try also. Another thing I found is I put in 1 1/2" longer rear shackles for more tire clearance. I did that at the same time my 60ft times slowed to 1.5s. I did some checking and found when I lowered the rear of the spring I lost 2 degrees of pinion down angle. I have corrected that for this year also. If I was smart I would just slow the car down and run 11.0s, but the motor head in me keeps searching for more speed. I will post an update in may after a couple of test and tunes. Jim

Stangman

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Re: racing my 66 Comet
« Reply #36 on: February 23, 2022, 09:49:49 PM »
 Its funny how it just dont stop. I said I would take the car to the track one time just to see what it does. The
pnly thing that did was wake up the racing bug in me. Keep plugging away Jim

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Re: racing my 66 Comet
« Reply #37 on: February 24, 2022, 03:18:13 PM »
I feel your pain, the same thing is happening with our little foxbody. Five years ago, my buddy called me up, and said the kids are grown up let's go racing. He had a 410 sitting in the shop doing nothing, and I had a car that needed a motor. So we agreed as long as we can get into the 12s we would be happy ( NOT ). Five years later were running 11.5, and were still looking for more. It's just the need for speed in all of us.
Clint

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Re: racing my 66 Comet
« Reply #38 on: March 02, 2022, 08:23:55 AM »
Jim, what degrees did you end up with after the shackle change and will you have to change tire size now?

Good Luck!
JB


67 Fairlane 500
482 cid 636/619.
Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’

Jim Comet

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Re: racing my 66 Comet
« Reply #39 on: March 03, 2022, 08:29:24 AM »
I had been running 5 deg pinion angle before I put in the longer shackles. My guess is after the new shackles were installed I had about 3 degrees. I am still waiting for my rear housing to get back to me to set up the rear. I am going to shoot for 4-5 deg of pinion angle. I am running custom made 2 inch wide springs that I have moved as far in as possible for tire clearance. I am running 29x9 Hoosier slicks currently but may try some pro bracket radials when its time to replace my slicks. My original tire clearance issue with the 29.5x9 slicks was at the back of the wheel opening and not side clearance.

6667fan

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Re: racing my 66 Comet
« Reply #40 on: March 04, 2022, 09:31:17 AM »
Jim, I have been following the back brace thread. Has a leaf spring relocation kit been considered?
It sure makes things easier under there and paves the way for bigger rubber. ( unless you are limited to 9” tire).
Thanks for sharing the driveline angle info.
JB


67 Fairlane 500
482 cid 636/619.
Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’

Jim Comet

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Re: racing my 66 Comet
« Reply #41 on: March 04, 2022, 09:22:21 PM »
I believe with what I am doing I could fit a 28x10 Hoosier slick if I want. I think any larger would require a mini tub regardless of where the springs are. I'll post some picks when the rear is back in place and all is assembled and resting on the slicks. Jim

6667fan

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Re: racing my 66 Comet
« Reply #42 on: March 05, 2022, 06:55:03 PM »
Jim, a 10.5 x 29 will fit with some mods and the relocator kit. The snubber has to go and the inner wheel well lip must be sectioned and folded back. The rim pictured is 15 x 10 with a 6.5” BS. No mini tubbing. This is on a ‘67 Fairlane.

https://i.postimg.cc/ryvGpzW0/9-DA19950-320-A-49-B4-8-C4-A-080-A4599-CD71.jpg


« Last Edit: March 29, 2022, 07:51:31 AM by 6667fan »
JB


67 Fairlane 500
482 cid 636/619.
Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’

Jim Comet

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Re: racing my 66 Comet
« Reply #43 on: August 07, 2022, 09:12:48 PM »
Saturday I went to a test day with the Comet. I made 4 passes with my new 1050 carb and Hooker collectors with 18"extensions. The car ran 10.76's at 125 mph on a 88 super humid day I was happy. Wanting to do some testing, I put on my 780cfm vacuum secondary carb untouched, which I had used last year and ran high 10.70's  and the car now ran pig rich 10.0 afr (84 primary w/power valve/90 secondary no power valve) 11.76's. I then dropped the jetting down 6 steps from last years setting (78 primary w/power valve and 84 secondary w/plugged power valve) and the afr went to 11.0 but still ran the same 11.6 et. We then got rained out. while I understand 12.5-13.0 is the desired afr, Could that really make a one second difference? when I blow air past the secondary vacuum port the secondary opens. What are your thoughts. Jim

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Re: racing my 66 Comet
« Reply #44 on: August 08, 2022, 09:29:10 PM »
The wrong A/F can certainly make a huge difference, and some engines will be more sensitive to it than others.  But a whole second is a lot.  I'm not sure that A/F alone would account for that...
Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
- 1969 Shelby Clone, Drag Week 2015 Winner Modified NA (Average 8.98 @ 149), 585" SOHC

   

6667fan

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Re: racing my 66 Comet
« Reply #45 on: August 08, 2022, 09:44:23 PM »
Are those A/F numbers through the traps? What did the 1050 show for A/F at the same rpm you are noting for the 780?
Where is your A/F sensor located?

Is  the “pull” on the 780 so strong that it is causing the carb to dump more fuel than it can use?

At least you know the combo likes the 1050
JB


67 Fairlane 500
482 cid 636/619.
Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’

Jim Comet

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Re: racing my 66 Comet
« Reply #46 on: August 09, 2022, 06:38:05 AM »
The A/F numbers are from the high gear shift through the traps. The 1050 showed high 12's through the same range. I initially made 4 passes with the 1050, switched to the 780 for 2 passes before it started to sprinkle. When the rain stopped and they dried the track, Wanting to see if it was carb, weather or engine causing the slow down I switched back to the 1050 and made 2 more passes after trying the 780 and the car was right back running 10's. My A/F sensor is mounted in my RH header, just after the merge area. I do have an 18 inch extension behind it so hopefully there is no reversion messing with the sensor.

6667fan

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Re: racing my 66 Comet
« Reply #47 on: August 09, 2022, 08:02:21 AM »
Well, I guess you could experiment with the 780. Different, tunable metering blocks might net different results but it’s not like you need to with the performance the 1050 is giving.

The header extensions are a tuning device? Just curious if any passes were made without them. I realize the reversion factor could go up and skew your sensor numbers.
JB


67 Fairlane 500
482 cid 636/619.
Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’

Stangman

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Re: racing my 66 Comet
« Reply #48 on: August 09, 2022, 07:53:51 PM »
If the 1050 is in the high 12s then tune that one to low 13s and see where you are. Im a fan of 780s but that ones not right for some reason. leave it be for now
and play with the 1050.

Jim Comet

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Re: racing my 66 Comet
« Reply #49 on: August 09, 2022, 08:42:12 PM »
My main deal is that the exact same 780 ran 10.7's last year and this year with no changes other than the exhaust collectors it is has slowed to 11.6's. Almost like the secondary's aren't opening plus it is super rich. I will wait until the next test day, when there is no rain in the forecast to retry the 780. My next race is Labor day weekend to run both brackets and index class so we will see what happens running just the 1050 that weekend. Jim
« Last Edit: August 09, 2022, 08:45:34 PM by Jim Comet »

6667fan

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Re: racing my 66 Comet
« Reply #50 on: August 13, 2022, 10:58:23 AM »
Jim, whenever I doubt that the secondaries aren’t opening I put a paper clip under the pod onto the actuating rod. If the rod goes up,(indicating at least that there is movement of the diaphragm), the clip will be pushed down lower onto the rod by coming in contact with the underside of the pod body. The clip should end up close to the throttle shaft end of the rod.
This test has to be done under a load of course.
JB


67 Fairlane 500
482 cid 636/619.
Tunnel Wedge, Survival EMC CNC heads, Lykins Custom Hydraulic Roller, Ram adjustable clutch, Jerico 4-spd, Strange third member with Detroit Locker, 35 spline axles, 4.86
10.68@125.71 1.56 60’