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Old 09-18-2004, 11:55 PM
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Why domed pistons are not recommended on a street engine is due to the compression created, back in the day as you refer to when high performance small blocks came with domed pistons, there was 117 octane leaded gasoline right around at the corner station that also had a anti detonation agent added in with it. Today the highest grade gas is 93 octane unleaded with no anti detonation agent. high compression on low octane fuel spells detonation which will quickly destroy a engine. the cam plays a role on the street with high compression since bigger cams bleed off some cylinder pressure at low RPM`s but this don`t make it any safer since it makes up for it at high RPM when you can`t always hear detonation. there are several additives you can add to help. setting a good Quench also helps to fight off detonation, another thing you can do is make sure there are no sharp edges anywhere on the piston top or the combustion chamber, as these develop hot spots that can cause detonation. Less spark advance will also help, but less power output will be the result.
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