Quote:
Originally Posted by wparsons
How does pulling timing lower cylinder pressures? Higher octane fuel isn't more resistant to cylinder pressures, but it does burn slower. Running richer can prevent detonation, which actually increases cylinder pressures since there is more fuel (which can't be compressed).
I 100% agree that you won't get the same power (assuming equal quality tunes on the same engine) on 87 octane as 93, I already said that above.
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It lowers peak cylinder pressure by dumping more heat out the exhaust, not good. Best way to lower cylinder pressure is to reduce the desired torque output :P