engine dyno numbers
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Well if he has a C6, I could see it knocking the HP down that far..on a chassis dyno!! whats the rule of thumb? dana 60 and a C6 25 to 30%... That 80Hp to add to his what..268..so thats 348 @ the Flywheel...
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
here are the details 390 standard bore ported c8ae-h heads edelbrock streetmaster intake with demon carb 750 cfm i think. cam specs are int lift .600 exh lift .750 lobe center 116.5 valve overlap 22 int duration 254.0 exh duration 256. set 12 btc
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Is that a roller cam? Are those the .050" duration specs? Also, that 12BTC is for the ignition timing, not cam advance, right?
Sorry for all the questions, I just think we need a little more information.
Sorry for all the questions, I just think we need a little more information.
Posting Guru
Joined: Aug 2001
Posts: 2,117
Likes: 0
From: Evanston, WY
Holy crap! What kind of cam is that? What rockers do you have? If those are .050 numbers on the cam then I think we found the culprit. Are you sure it's .750 on the exhaust? I'm running a 511 with 12:1 and BIG heads and my cam is on the edge of being too much with a .262 duration @ .050, and I only run .695 Gross lift on both valves!
We definately would like more info on this one.
-Scouder
We definately would like more info on this one.
-Scouder
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
yeah the shop that ground it ground it to those specs and the cam is 12btc and i am runnuing roller rockers at least it makes good torque
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
You mean you advanced the cam 12 degrees? Well that's what's doing it. Set the timing straight up on the cam and I think you'll have the problem solved! 
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Posting Guru
Joined: Aug 2001
Posts: 2,117
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From: Evanston, WY
Don't know if it was chassis, or engine. The engine itself looks to have a decent match of parts, but that cam is something else. It seems to be all over the map. A TON of lift on the exhaust, WIDE lsa, and I don't know if those are .050 numbers on duration, so it's either way to much or way to little duration for those heads and intake.
-Scouder
-Scouder
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
I think that's a good torque number, especially at 2000rpm. It would probably make even more torque at higher RPMS if the cam wasn't so odd. Not to mention the HP, should step up a good bit.
Do you have a Dyno graph? How about air/fuel graph?
Do you have a Dyno graph? How about air/fuel graph?
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