Sounds like a part throttle session to me. Step on it would ya? :lol:

That's fricken funny......and you could be right :headscratch: :lol:

Sheesh! That's what I was thinking!! 4.3 gallons on a track day?!? The only time didn't use more (like 2-3 times that!) was wen it was broke on the trailer after a few runs! LoL!

;) :hello:

You do realize I'm just talking about one session out of the 4 total for the day right Jimmy :headscratch:

Well a dyno is the PROPER way to build a real tune on any motor....

I'd be running 36* in that motor to start with and see if it likes it.







It has EVERYTHING to do with combustion efficiency.... and heads and the propagation of the flame travel etc. However..... High compression only tells you what gas you're going to have to run -- it doesn't tell you what timing a motor is going to need / want.

The fuel - in this case - is what leads me to the timing in question. So assuming he has good heads - aluminum - we know he has high compression -- and the numbers he's tossing out is the STATIC compression number of the piston --- because what really counts is the CYLINDER PRESSURE -- and that depends on his cam numbers. But 114 octane gas is going to want more timing than pump fuel.










Really doesn't matter except the high compression is going to want high octane fuel in order to stave off detonation. Thus the only real reason to understand that part of the motor.







I burn about 9 gallons per session.... might have something to do with how often a guy is WOT..... LOL

BTW -- For the record --- WE ARE ALL JUST GUESSING....


Mines just a more educated guess.

We've chatted about this before. That is weird. Not sure why your using so much fuel.........Same deal at T-Hill. I use about 5 gallons a session there and our lap times as of late have been pretty close.

No, actually I didn't realize that. Not sure how big the track is there and how many laps, so I can't comment on what mine "would be" there. All I know is that I had to fill like 3 times at Putnam park when I ran there a couple different times. And that was going in with a full tank.

But glad that you may be figuring it out that it could be the gas. It sounded to me like an ignition issue, but if for some reason fuel isn't burning, then it would seem like ignition. I'm anxious to see what you find to be the real issue. Lots of discussion and learning going on here

Totally agree with you --- until we toss in the 114 octane.
You can not compare two completely different motors -- all that will tell you is that they are completely different. For many obvious reasons.


A good running MOPAR 440 --- wants 40* total on PUMP gas with good heads. That's NOT a SBC.... or a FORD for that matter. Different motors want different timing.









Good heads -- tight quench -- etc -- my 408 motor ran 34* and made best power. A dyno is going to tell you -- you don't tell it. You find it. The numbers don't lie. It was also running PUMP GAS not 114.