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Messages - jcarlson

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FE Technical Forum / Re: Specs on AC,AD carbs
« on: October 21, 2019, 01:05:50 PM »
Thanks Drew, I have a set of BD carbs also, so that's good info.
Interesting about the spring, I hadn't thought much about that with the different booster. I'll try different springs next year and see what happens. For some reason, I cannot find a set of "plain" springs. I'm sure I have a set, but who knows where. At what rpm would you expect them to be open fully, if ever?

2
FE Technical Forum / Re: Specs on AC,AD carbs
« on: October 21, 2019, 11:54:20 AM »
Uh thats not right. 98 mph not 118

3
Private Classifieds / Re: 66 67 Fairlane Original Shifter and Rods
« on: October 21, 2019, 09:27:13 AM »
Do you have a handle? Is there a difference between small block and big block?
Jim

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FE Technical Forum / Re: Specs on AC,AD carbs
« on: October 21, 2019, 08:01:11 AM »
Just an update from Saturday's race.
I jetted the carbs per Drew's specs (70 jets) and put a long yellow spring in each secondary. BTW, those spring colors are poorly marked by Holley. In any event,  on Friday night I looked at the weather report and saw 30's-40's predicted for Saturday morning.  Kinda worried about being too lean, I succumbed to internal pressure and re-jetted to 72's....racing vintage 427's can make one do funny things! Set the timing to 40 degrees total.
1st pass: 6.99 at 118
2nd pass: 7.01 at 117 (leaky needle and seat in one of the secondaries, replaced it with a new one)
3rd pass eliminations: 6.992 at 118 (6.99 dial, but red bulb)
A best ever 60ft of 1.51.....very happy! I can actually feel the difference off the line.

These carbs work great. Now I can look at the 6.99 dial on my window all winter long! Been aiming for the 6's for 20 years.

Thanks Drew!

5
FE Technical Forum / Re: Should you buy a Tunnel Wedge intake? Think again...
« on: October 09, 2019, 02:30:08 PM »
A few years ago, I was very interested in this subject since I have both manifolds. I took the actual numbers from Jay's book on his largest engine figuring at least I have a 600HP engine. Jay was smart enough to publish the actual dyno numbers at each rpm not just the curves. I plotted from 4000 rpm (my converter stall) to 6500 (shift point) and found no difference between the two manifolds. As I remember the average horsepower was within 1 HP !! The numbers are the same all the way up.
Another anomaly, was the fact that the TW had slightly more torque than the dual plane down low (around 3000 rpm by my bad memory).
I am now using the BT MR intake and it idles better in the pits than the TW. It could be my imagination but the idle mixture screws seem easier to tune.

Is the BT intake available anymore? It is well executed.

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FE Technical Forum / Re: Specs on AC,AD carbs
« on: October 09, 2019, 11:00:10 AM »
Thanks Drew,
I'll visit your FB page later today.
I'm going to jet down from the 77's and see if the car likes it.
I ran the light yellow springs in the 1850's and it seemed pretty good, although to be honest it is hard to tell unless you make big changes to these springs. It seems to affect when the secondaries pull in, not how much they open.
Of course making ignition timing changes also affects the carbs....almost too many tuning parameters!! The car likes around 40 degrees total, but it starts too hard as I have the timing locked out. So I have it set at 36 for the moment. I'm going to re-curve/unlock the Duraspark distributor before the 19th to cure that problem.

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FE Technical Forum / Re: Specs on AC,AD carbs
« on: October 09, 2019, 10:07:08 AM »
Drew,
This is awesome stuff. Thanks.
I've always wanted these carbs and so I'm excited to play with them. I know they are probably "tuned" for the TW intake, but I'm trying them on the dual plane. The old Muscle Parts books say to use them on either intake. The bell boosters are the key for me as I have a heavy car with only 4000 stall converter. I have the pink cams and 28 squirters for longer shot of fuel off the line and it seems to be working with a best so far of a 1.52 60ft. The car leaves much harder than with the 1850's I ran previously.
The idle seems a bit rich, but maybe jetting down will help. I'm not familiar with the idle circuits on other carbs so it is hard for me to compare.
I'm going to start with the plain spring in the secondaries.
Hopefully, the weather on the 19th will give some good results!
 

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FE Technical Forum / Re: Specs on AC,AD carbs
« on: October 08, 2019, 06:32:23 PM »
Thanks. 
Those are the specs I’m looking for. These are original carbs and I tried the 77 jets and is too rich. I’ll go down in size since they came with 70’s. I suspect the 77’s are what Ford suggested to be safe. I’m running them on a BT dual plane intake so the signal is probably stronger.
I’ll play with the secondary springs.
One day of racing left here in Buffalo !!


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FE Technical Forum / Specs on AC,AD carbs
« on: October 08, 2019, 04:42:32 PM »
I have a set of 2x4 carbs C8OF-9510-AC/AD carbs. I'm looking for some info on jetting, plates, secondary springs, etc. Hoping someone here has the original specs. I looked at MustangTek website and they have them listed, but there is an error in that they say they have a power valve and these do not. I know Ford listed these as 652's for drag racing only. Holley tech has no information.

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Non-FE Discussion Forum / Re: Strange axle issue
« on: May 26, 2019, 06:44:55 PM »
Thanks everyone. It seems that both colors could be correct. I may try tye file test when i get back from the holiday

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Non-FE Discussion Forum / Strange axle issue
« on: May 23, 2019, 04:15:26 PM »
Received my 33 spline axles from Strange the other day. Something doesn't seem right to me. These are Pro Race 33 spline. The longer axle is silver color and the shorter axle has the usual dark brownish black finish.  I'm concerned that one axle, the silver one, wasn't heat treated. I called Strange and they said it was due to the axles being part of different heat treating batches. I'm hardly convinced. Anyone here have these axles and can share some insight? Otherwise they look great. 
Jim

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