The last 5 gallons I put in the car prior to this last fill was from a local station in Placerville. He was down to the bottom of the barrel with 110 and had to tilt the barrel to get me 5 gallons.
That's some interesting info Greg. I didn't know higher compression likes more timing. When I originally dynode this motor in Muncie, Indiana at the builder shop we went with 38* total timing.
When I dyno tuned down here after the timing chain incident Joe thought it ran best at 32.5*.
__________________ Gaetano Cosentino
Last edited by Track Junky; 07-13-2014 at 08:43 PM.
I disagree with Greg to a point on timing needed. Compression is part of it but the efficiency of the heads/combustion chamber has a big part to do with it.
Based on your theory Greg, tell me why my motor likes 30* timing (13:1 compression) and Rob's FE likes near 40* (less than mine, around 12:1 give or take).
It's mostly due to the difference in combustion chamber, valve angle, etc.
Typical 23* headed engines do not run low timing (relatively) like 32* so that is very surprising. 36-38* sounds more like it. I am thinking Joe built in a lot of safety for you? I dunno else why. That doesn't make much sense to me based on what you've shared.
__________________
2004 NASA AIX Mustang LS2 #14
1964 Lincoln Continental
2014 4 tap Keezer
I think Dave's engine builder is the one that talked him into blending race gas with his pump gas.... that was good for about a day's worth. LOL
Wrong. The motor blew because I DID NOT add some 100 octane in that weekend like previously. Constant beating with shaky unpredictable 91 octane on a high revving 11:1 motor was not the best thing to do, but it is what it is.
Quote:
Originally Posted by Track Junky
I repeat......my motor is 14:1
Weren't you 12.5 to 1 before?
__________________
2004 NASA AIX Mustang LS2 #14
1964 Lincoln Continental
2014 4 tap Keezer
Wrong. The motor blew because I DID NOT add some 100 octane in that weekend like previously. Constant beating with shaky unpredictable 91 octane on a high revving 11:1 motor was not the best thing to do, but it is what it is.
Weren't you 12.5 to 1 before?
Nope. Build sheet shows 14:1. Piston part number shows 15:1
My car is going to use gas like a Prius compared to yours. I filled my tank at Sonoma and then ran a full session. Went back to the pumps and refilled just to get an idea of how much fuel I used........only 4.3 gallons
Brian Hobaugh SCCA National Tour June 2014
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