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#1
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400 with Speedmaster Dyno Results
Just thought I would post the results of a recent dyno session. It is a .040 400 with Icon flattops, Eagle rods and HR cam. The Heads and cam were bought from Pontiac Speed Shop. All pulls were made with a 770 Street Avenger
carb. The sheet posted was with a TII and a 1/2" Super Sucker spacer. We tried an RPM and it made as much HP and a little more torque but it took a 1" spacer and since I am putting this in a 79 TA that won't work very well if. Peak numbers were 434 HP and 458 TQ. I was told this was a conservative Stuska Dyno. |
#2
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Run the better intake with a drop base air cleaner. It looks better, and turns your shaker into a functional cold-air intake.
Nice numbers for a 400! https://butlerperformance.com/i-3164...tegory:1234772
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, 11.61@116.07 in the quarter...still tuning. |
#3
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So does that mean you run out of the box speedmaster alu heads..?
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#4
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Yes, no porting but Randy setup the springs for the cam. Also, this was with 32 degs total timing.
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#5
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Wow, that's nowhere near enough timing.
It's got to be a combination of frustrating and encouraging to get a good dyno sheet but know that a whole bunch of power was left on the table with a simple adjustment.
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, 11.61@116.07 in the quarter...still tuning. |
#6
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What compression ratio?
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#7
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Quote:
Not sure about that, the KRE d-ports do not need a lot of timing. Good numbers, I think it could use a little more cam. |
The Following User Says Thank You to ponjohn For This Useful Post: | ||
#8
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Good numbers and the Speedmaster heads seem pretty capable as it didn't need a lot of cam either.
/ Way back when the KRE's first came out a 400 build made right at 450hp with the 221/229/112 Crower cam about 10 more HP with the 228/235/112 cam. Torque peaked in the 460-470 range. They didn't like much timing either, right around 30-32 degrees nearly as I can remember......
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
The Following 2 Users Say Thank You to Cliff R For This Useful Post: | ||
#9
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I must be honest by saying that I am not impressed!
Here’s a dyno test of a 364 cid SBC with Trickflow heads that I ported up to 260 cfm. The motor had 10.25 compression and a Crower cam. Two flat tappet hydro cams where tested . The final cam as used in this test made 9 more ft lbs of torque and 17 more hp. The cam specs where 220/226 Cam Lift .462” .470” 1.6 rockers where used and the cam was advanced from 112 to 109. A 700 Holley was used on top a Victor jr manifold that I had blended the plenum on and gasket matched,
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 02-20-2021 at 02:23 PM. |
The Following User Says Thank You to steve25 For This Useful Post: | ||
#10
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I thought we decided comparing results from different dynos was “iffy” at best. Maybe I misunderstood.
Murf Sent from my iPhone using Tapatalk Pro |
The Following User Says Thank You to Murf For This Useful Post: | ||
#11
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Not if in both dyno test being compared the correction factors are clearly stated and realistic and using the BSFC and fuel poundage per hour numbers match up with the uncorrected hp numbers , in which case yes, they can both be directly compared!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#12
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Quote:
What kind of dyno was that? Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#13
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Quote:
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#14
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lose that street avenger carb... bet a true double pumper or even a properly set up Q-jet would get much better numbers (& mpg with the q-jet) with everything else the same.
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The Following User Says Thank You to 78w72 For This Useful Post: | ||
#15
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Was it dyno'ed with Headers or R/A manifolds or StockLog manifolds ? Guessing you picked up probably at least 35-45 extra horses versus same build with un-touched Iron D-Ports. i think thats about the power range of a fairly well prepped RamAir IV engine. If it has good driving manners with street gears i would be real happy with it. |
#16
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Stan the dyno test was done on a inertia type dyno with a capacity of 2500 hp as I recall.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#17
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400 with Speedmaster Dyno Results
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Edited my post, as I miss read the dyno sheets. Don’t know, seems like a nice build for a driver to me. I think the RPM & Qjet would be a good set up though. Murf Sent from my iPhone using Tapatalk Pro Last edited by Murf; 02-20-2021 at 04:38 PM. |
#18
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Quote:
Few years back I had built & dynoed a 69' T/A RAIII 400 with stock iron heads, 10:1 CR & Lunati 227/233 cam and made 380 hp.
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Carburetor building & modification services Servicing the Pontiac community over 25 years |
#19
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i had one of the 770 street avenger carbs, was brand new & came on a stroker motor i bought, they guy bought it because it was shiny & looked cool... i sold it to a friend who used it on a aluminum head stroked ford, the shop that built the engine said it was horrible to get running good on the dyno & they had to rebuild it to get it to run decent & even then suggested he find a different carb to use. |
#20
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