L-72 Dyno Test

[69yenkoman]

Marlin:

Your car is coming along good. I like the old 1/4's haning in the background as well. Looks like you are doing a super job.:burnout
:

[YENKO DEUCE REGISTRY]

Thanks for the kudos, I can't wait to drive it. I also saved the deck lid and tailight panel, and plan on hanging them together in my garage at home. Brian Henderson has an original '69 Yenko Camaro 1/4 hanging in his shop as well, they look cool!
M

[Chevy454]

Well, guys, it's final: we put the L-72 on the dyno yesterday, and it spun it up to the tune of 420hp@5,600. This was through the exhaust manifolds, of course, but we were more after a good "break in" for the engine, and to try so different settings (jetting, timing, lash, etc.). Needless to say, we learned a LOT! The settings we ended with (lash=24,24 jets=78,84 timing=40 degrees) are a little bit different than what Pete used, but they worked the best for us, so we stuck with 'em. Now, I had better go see about getting that thing between the frame rails...

[JoeC]

WOW 420 HP with exhaust manifolds. Sounds great. Did it have mufflers hooked up also?

[Chevy454]

No, no mufflers, but the "dyno guy" said that a good set of mufflers (like a DynoMax) wouldn't change that much, except raise the torque a shade.

What we did was tune for a broad power curve, versus a higher peak. When we found that, we stuck with it. From 5,100-6,000 it was making 400hp or more, and was in the 416hp-420hp range all the way from 5500-6000. 6000rpm was about the most the engine seemed to like to run...now the only problem is keeping dad from spinning it over 7k!

[COPO PETE]

Congrats Rob....12.6 here you come!!!!!!!!
Peter

[Rowdy Rat]

Rob,

Well done!

I'll be looking forward to see how you do at the PSMCDR this year.

By the way, did you decide to use the 291s with the big exhaust valves or did you go with the 840s?

Regards,

Stan Falenski