Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Spark Plugs: Projected vs Non-Projected Tip
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Old 07-16-2012, 08:29 PM
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high compression engines

My dealing with spark plugs revolve around whether or not the piston hits them and mashes them closed. In high compression (racing engines), the piston dome can hit the plug. So two ways of stopping this is indexing the plugs or go to non protruding.
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