![]() ![]() ![]() ![]() “In forced induction (FI) applications, erring on the low side is much safer than pushing your luck on the high side. On the high side carries greater risk in tuning and potential component failure if appropriately better fuel is not used,” says Alan Stevenson of JE Pistons. “Too little compression will usually result in unmet performance expectations. write the number on the piston as your checking for easy comparison. Move the indicator to the deck plane of the piston to read how far the piston is below or above the deck of the block. First, bring the piston to TDC, then zero the dial indicator on the deck surface of the cylinder block. The compression ratio is affected significantly by the deck clearance volume, The distance between the piston crown at TDC and the height of the deck surface.
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