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#21
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Cool build and I'm curious to hear how it does in the car.
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Chris D 69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60' |
#22
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I would expect more HP out of 248/253 cam. I think Steve25 is correct with his 450 estimate. Extrapolating the torque curve, I would guess a peak of 3600 to 3700 at 558 to 586 torque. what brand dyno was he using. We pulled down to 3000 with the SuperFlow 901 with 697 peak torque.
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GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
#23
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Quote:
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#24
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What dyno
Ken, On the paperwork I am now looking at it says " Super Flow WinDyn V3.2 " I don't know if that tells you anything I know little about this.
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#25
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Here is the dyno sheet:
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#26
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Quote:
If one had a dyno session using a RPM intake with a 850 DP but made a pull using one of those pinch down adapters and then made pulls with a std 4 hole you would get a better idea what they cost in terms of horsepower. This is a very cool build and i was wondering if that adapter cost him the 15 HP more it should have made. It might have. |
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#27
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A profile more suited to the application and rpm range. In YOUR engine, with 9.5 compreasion and those lobes, that 112 is hurting you. With Edelbrock heads , a single pane and 10.5 compression, it would be a different conversation. That cam wants to shine up top, and can't due to heads and intake, so torque drops like a stone. If 5500 rpm is what you were after, a profile more suited to work there would have yielded better results. Not knocking what you have. Just an observation.
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#28
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Rocker ratio?
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#29
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Windyn is just the Superflow computer program for the dyno.
Run it as is for now and see if you want more top end and if so take 2 degrees of that 4 out of the cam.
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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! |
#30
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Similar power from this 455
http://forums.maxperformanceinc.com/...d.php?t=802889 |
#31
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Paul,
Thanks for the dyno sheet. That seems like a strange fuel usage curve. Any idea why? 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 |
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#32
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1.65 rockers used
Last edited by taktikian; 10-10-2021 at 07:13 PM. Reason: incomplete response |
#33
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I think carb way too big. Thinking of trying to get the SMI functional and do away with adaptor plate. Don't ask me the cost of the Holley he slapped on-it is embarassing but I am the one who said go ahead so it is what it is.
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#34
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#35
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I doubt the carb size hurt the numbers. If anything the 950 size probably helped a bit up top and wasn't run low enough to matter. In reality all that comes into play with drivability anyway, and that's not something that can be determined on an engine dyno.
I've seen those 950 carbs on 350's on up over 500ci, they are pretty versatile. Once jetted properly for the combo they work pretty well. I think you did well for the combo you have. I personally would have liked to see more compression with that cam, or maybe a cam more suited to the compression you have, but overall it's not bad and should be pretty fun once in the car. Plug it in and enjoy it. |
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#36
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Len Williams 455 with stock heads rated about 425 HP.
http://www.lenwilliamsautomachine.co...ong_Block.html Seems stock intake / heads are the bottleneck around that power level. Last edited by pastry_chef; 10-10-2021 at 11:13 PM. |
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#37
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Quote:
https://forums.maxperformanceinc.com...errerid=134156 A RAIV head and manifold flows considerably better and has a larger port volumes. Last edited by PAUL K; 10-11-2021 at 08:50 AM. |
#38
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Quote:
http://www.wallaceracing.com/ultimateflow.htm |
#39
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#40
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FWIW…Here are one of my friends 614 bone stock flow numbers with the stock original valve job. I think they likely vary more than the d ports though. It has been said there are some 250 cfm bone stock ra4 heads around.
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