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Engine & Engine Build Terms
TBolt USA Tech Database!


TECH-0113


Square Bore - An engine with the same bore x stroke , example 54mm x 54mm 

Under Square - An engine with smaller bore than  stroke , example 52.4mm x 57mm 

Over Square - An engine with a larger bore than stroke , example 51mm x 57mm 

Deck height - The distance from the top edge of the cylinder to the outer edge of the piston crown at top dead center.

Pin height - The distance from the center of the wrist pin to the upper edge of the piston crown or face.

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