Help me analyze my cam vs. Horsepower vs. RPM range

rkammer · Jun 30, 2020

No Lift said: ↑

Doesn't matter how the engine only had 24* of timing just that it didn't have around 34* like you now have it. I'd take it to a chassis dyno and extrapolate how much HP 10* less timing costs you. For less than $100 they usually let you get in 3 runs as long as they aren't tuning the car. Make sure the car is cool going in with the timing at 24*. Make a run to 5500. Reset timing to 32* and make a pass to 5500. I'm sure there will be a big jump. Make a third pass to 5500 just to have some fun. Doesn't matter what it actually puts out. What ever the difference is at the wheels between run 1 and 2 you can pretty much add to all the test points of your original engine dyno test and get an idea of what it can do at the flywheel. Not exact but ballpark. Also this will tell you where you engine is really making peak power at.

I hope the engine guy gave you a discount for the dyno run because it was his screwup.
Click to expand...

Once I get the fuel system all upgraded your suggestion will be fun to try. As for the dyno runs, it was all part of the engine build deal. I do wish he'd gotten it right while I was there to witness the runs.

LARRY70GS · Jul 1, 2020

rkammer said: ↑

True but, when he set max timing without a load on the engine the 10 deg. vacuum advance would still be in as it was connected to full time vacuum. Larry's response considered that as you've probably realized.
Click to expand...

That's no excuse, it is still his screw up, and it pretty much negated any results you got with that session. 10* is a lot of timing at higher RPM. I don't know exactly what you lost, but it was substantial.

rkammer · Jul 1, 2020

LARRY70GS said: ↑

That's no excuse, it is still his screw up, and it pretty much negated any results you got with that session. 10* is a lot of timing at higher RPM. I don't know exactly what you lost, but it was substantial.
Click to expand...

It wasn't meant to be an excuse, but rather the reason he screwed up. All he could do at the time was apologize. How do you assign a dollar amount to that since I'd since corrected the issue. I did chew him out pretty good and told Richard how unhappy I was for getting a bad dyno run. Richard was present for the runs but didn't witness the setting of the timing.

LARRY70GS · Jul 1, 2020

rkammer said: ↑

It wasn't meant to be an excuse, but rather the reason he screwed up. All he could do at the time was apologize. How do you assign a dollar amount to that since I'd since corrected the issue. I did chew him out pretty good and told Richard how unhappy I was for getting a bad dyno run. Richard was present for the runs but didn't witness the setting of the timing.
Click to expand...

I understand. At least you know it is not the cam.

Log in or Sign up

Help me analyze my cam vs. Horsepower vs. RPM range

rkammer Gold Level Contributor

LARRY70GS a.k.a. "THE WIZARD" Staff Member

rkammer Gold Level Contributor

LARRY70GS a.k.a. "THE WIZARD" Staff Member

Share This Page