My "Late Life Crisis"!

['69Novajoe]

Originally Posted by napa68

Really nice Joe!

There is so much that can effect the "result" from an engine dyno then going to a chassis dyno. The correction factor on each is a big one as is the air the way you mentioned it. I'm a little surprised they did not adjust timing in the engine dyno session to begin with. On the bright side, it seems as though your fuel system is up to the task. That would certainly show up on the chassis dyno. You are also driving the fan and accessories in addition to the drivetrain.

My history with different combinations (engine dyno) were to start with 32 degrees (safe) just to make a pull and see where EGT's / AFR's are. Then start adjusting the carb and timing as needed. We'd always go in 2 degree increments to see how the engine responded. 36-38 seems to be the sweet spot. My only exception was the L88 in the HM Camaro where it liked 40. That L88 though had a camshaft and cylinder heads from the stone age

I, too, for one, was surprised more "tuning" wasn't done on the engine dyno?? They were going off of what the carburetor builder suggested, which was 34 total degrees. At the chassis dyno they bumped it up to 36 and David (the son) wanted to try even more but Terry said just to leave it there. That's when we saw 13 more horses!! (but that also included revving it higher in the RPM range)