Quote:
Originally Posted by Daox
If your header is creating more low end torque, wouldn't it make sense that it also creates more knock? Higher charge density = more knock, right?
Higher charge density at the same ignition timing should always mean better efficiency (assuming everything else is constant). However, if your engine must retard timing for a higher charge density, then you can obviously lower efficiency. It sounds like this is what is happening to you ever_green.
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If the new header lessened reversion and therefor the amount of (hot) residual exhaust gases in the cylinder the more power could be made as well as reducing the chances of detonation.