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Mankind · 06-01-2010, 10:00 PM

The main reasom you can use 87 in these engines is because when the computer pulls timing it also affects the timing of the injectors opening with 500+ psi behind them.

The SS will without a doubt knock audibly if using 87 octane when you have it under load. The injection system is different and is not as percise with the moment the injector opens. This is due to the lower fuel pressures. 87 will predetonate and cause the "knock" to be rather aweful.

Maybe they need to look into the V8 not being a push rod engine and doing away with the fuel being injected into the intake port.

06-01-2010, 10:00 PM	#45
Mankind Whats a Millwright? Drives: 2LT/RS SIM, 05 Wht Denali Join Date: Feb 2010 Location: Holden, LA Posts: 410	The main reasom you can use 87 in these engines is because when the computer pulls timing it also affects the timing of the injectors opening with 500+ psi behind them. The SS will without a doubt knock audibly if using 87 octane when you have it under load. The injection system is different and is not as percise with the moment the injector opens. This is due to the lower fuel pressures. 87 will predetonate and cause the "knock" to be rather aweful. Maybe they need to look into the V8 not being a push rod engine and doing away with the fuel being injected into the intake port. Last edited by Mankind; 06-01-2010 at 11:38 PM.