race fuel or ??
04-13-2003, 10:12 PM
#1
Racer
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race fuel or ??
OK, I have a hybrid type motor I just finished building. 1996 993 case with '97 varioram heads,GE 100 cams, 993 crankshaft, 12.5:1 CR, twin plug,slide valves, Autronic EFI, mild porting (43.5mm intake), headers, megaphones, race only, crank fired. Do I need to run 108 octane fuel...or mix 108 (leaded) and pump 92, equally, for 100 octane? Or is straight 108 needed?
Thanks in advance !
Thanks in advance !
04-14-2003, 02:03 AM
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I run Sunoco GT-Plus 104 octane, unleaded. The compression ratio on high boost is just about 20:1 and the MoTeC does not have anti-knock capabilities. Makes more H/P than Sunoco's 113 octane leaded fuel.
04-14-2003, 05:19 AM
#3
RL Technical Advisor
Hi Howard:
IMHO, you should use the 108 octane fuel for that engine displacement and compression ratio.
The detonation threshold is dynamic and changes with cylinder head temperature.
IMHO, you should use the 108 octane fuel for that engine displacement and compression ratio.
The detonation threshold is dynamic and changes with cylinder head temperature.