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Yellow Fever said:
I know that when you run a TT set up the likelyhood of engine Knock increases significantly due to the air being pumped into the cylinders under pressure by the turbocharger, and then being further compressed by the piston . From what I've gathered the Knocking happens because as you compress air, the temperature of the air increases and The temperature may increase enough to ignite the fuel before the spark plug fires.

I ran my Blown C5 at 12PSI boost with minimal to no knock , would this be a safe amount of pressure to run my Viper on 91 Oct ( Providing we didn't pull to much timing out )??

Thanks !


Jeff, knock happens when the air/fuel mixture ignites BEFORE it is supposed to while the piston is on the way up. When this happens, the piston gets a ghetto ass whipping on the way up instead of a hammer on the head for the way down on the powerstroke. This may not be the most scientific way to explain it, but it is the way I understand it.......I think a lot depends on the compression ratio{are you getting the motor rebuilt?} and the type of tuning you will have. I know Heffner will be using the AEM with knock sensors. I am no tuning expert, but I am sure he will figure it out. Just make sure you get a fresh tank of 91 octane in the car before you send it to Heffner.
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