Author Topic: Guess the horsepower game....  (Read 27762 times)

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e philpott

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Re: Guess the horsepower game....
« Reply #120 on: September 18, 2018, 12:25:05 PM »
If you want to compare what this engine did against other engines, we can do that...

Even if a dyno corrects 87%, it's still valid to compare against other builds on the same dyno.  The reason for the uncorrected numbers was so that the engine could be compared against other engines from other builders, on different dynos.  Most everyone will have access to the uncorrected figures.

So this engine made 538hp @ 6000 here, with 515 lb-ft @ 5000.  With the Dominator, it made 540 hp @ 6250 and carried it to 6500, with 515 lb-ft available @ 4750.

Other engines in my records that have similar horsepower to this one:

1.  445FE, Survival Motorsports heads, as cast, 235/241 @ .050", .613/.575, Performer RPM, 10:1, 525 hp @ 5500.
2.  433FE, ported C5AE-F heads, Sidewinder intake, 235/241 @ .050", .600/.600, 10.5:1, 526 hp @ 6000.
3.  438W, AFR 220cc heads, RPM Air Gap intake, 240/246 @ .050", .586/.590, 10.3:1, 535 hp @ 5700.
4.  408C, Edelbrock 351C heads, Performer RPM Air Gap intake, 240/244 @ .050", .622/.628, 10.5:1, 522 hp @ 6100.
5.  347 Clevor, CHI 185cc 3V heads, CHI 3V intake, 223/227 @ .050", .628/.635, 10.5:1, 517 hp @ 6250.
6.  347SBF, AFR 185cc heads, Victor Jr. intake, 230/236 @ .050", .600/.600, 11.25:1, 538 hp @ 6500.

I think the 390 did pretty stinkin well.
[quote Brent
Totally agreed !! the 390 holds up well against the others listed !! Brent what is the Torque comparison between the 347 AFR185 and this 390 ?? curious if the 347 holds up against the 390 on the torque for similar power
« Last Edit: September 18, 2018, 12:27:26 PM by e philpott »

blykins

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Re: Guess the horsepower game....
« Reply #121 on: September 18, 2018, 01:24:07 PM »
No sir, it doesn't.  It was a wilder cam, so the powerband was shifted up.  Horsepower went up, but torque went down.  That 347 makes about 450 lb-ft, corrected, on this dyno. 
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
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69Shakar

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Re: Guess the horsepower game....
« Reply #122 on: September 20, 2018, 12:08:23 AM »
I was looking at the build plan and was wondering why the stock rockers instead of roller rockers with larger ratio??

blykins

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Re: Guess the horsepower game....
« Reply #123 on: September 20, 2018, 05:05:18 AM »
I was looking at the build plan and was wondering why the stock rockers instead of roller rockers with larger ratio??

The larger ratio would have just added about .009" lift. 

The important issue here is the weight of the non-adjustable rocker versus the adjustable rockers with the large adjusters and nuts hanging off the back.   This build, from the get-go, had a plan to try and peak the horsepower at around the 6200-6300 rpm mark.  In times past, with other builds, we have often had trouble getting there without issue; the lifters usually want to give up at around the 6000 rpm mark because of the size of the FE valves and valvetrain components.  The non-adjustable rocker arms help in that respect, as reducing the weight gives us some extra "rpms".  This one pulled to 6500 with no issue, even though it didn't have the cam to keep it going up that high. 

The non-adjustable rockers are the bees' knees IMO, so much that I have contracted a US company to make non-adjustable FE rocker arms for me, with roller tips, and with both bushing/bearing fulcrums, so that we can use them with some higher spring pressures and smaller stemmed valves.
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
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66FAIRLANE

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Re: Guess the horsepower game....
« Reply #124 on: September 20, 2018, 08:31:35 PM »
Is there any reason you can't/shouldn't gun drill the stems on normal valves and run lash caps to remove some weight?

Joe-JDC

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Re: Guess the horsepower game....
« Reply #125 on: September 20, 2018, 09:05:13 PM »
Ferrea sells hollow stemmed valves that are relatively light and strong that are a viable option for titanium.  Joe-JDC
Joe-JDC '70GT-500

Barry_R

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Re: Guess the horsepower game....
« Reply #126 on: September 20, 2018, 09:10:54 PM »
Is there any reason you can't/shouldn't gun drill the stems on normal valves and run lash caps to remove some weight?

You theoretically could. 

The drilling would need to be absolutely perfectly straight and concentric with the stem OD, and have zero internal machining marks or flaws to prevent the creation of a stress initiation point.  I have heard of current hollow stem valves being drilled top down prior to installation of a friction welded hard tip, or with the drilling going in from the valve head end and being welded shut at that end.

Not something you are going to do at home even with the top of the line Craftsman drill press, or a Makita and a good bench vise...    ;D

66FAIRLANE

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Re: Guess the horsepower game....
« Reply #127 on: September 21, 2018, 01:22:54 AM »
Point taken on the "at home" & "machining marks" comment, although I do have a small lathe.

I wonder if you could drill undersize & then ream to finish to minimize these marks. Also the use of a sizing drill (where the corners are rouned off) may help to minimise any marks. I am just surprised this doesn't seem to have been tried much.


My427stang

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Re: Guess the horsepower game....
« Reply #128 on: September 21, 2018, 05:39:44 AM »
Seems like it'd be tough to keep runout in check building heat in the stem.  Not a machinist, but that's a deep hole to drill
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blykins

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Re: Guess the horsepower game....
« Reply #129 on: September 21, 2018, 05:44:12 AM »
Seems like it'd be tough to keep runout in check building heat in the stem.  Not a machinist, but that's a deep hole to drill

Yep.  Easier to just buy hollow stem valves.
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
Instagram:  brentlykinsmotorsports
YouTube:  Lykins Motorsports

gdaddy01

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Re: Guess the horsepower game....
« Reply #130 on: September 21, 2018, 06:54:43 PM »
thanks for a good laugh , Barry .