Quote:
Originally Posted by steve25
The most distructive level of detonation that takes place at full throttle you will never hear even with closed exh, but you would have sure as hell seen it on your spark plugs if you knew what to look for , or even first off knew how to determine if you even had the needed heat range of plug in your motor for it to live at full throttle time after time.
If a motor is on the edge with jetting at full throttle and you combine that with a wrong heat range plug your guaranteed to have issues.
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Why throwing soem higher octane race gas is no convertors or 100 octane race/unleaded and see if the motor picks up HP on the dyno or time in the 1/4. My zero deck RAIV 400 picked up 8 HP on the dyno with race gas and no audible detonation-and on dyno we ran mufflers!
There is a point where higher octane and it's slower "burn" can hurt you. Friend with a 66 Acadian(Pontiac Chevy II) and a pump gas SBC ran out of gas at the track and all they had was race gas. Slowed down 0.2 seconds!