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Old 12-14-2012, 03:44 PM
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Quote:
Originally Posted by cdminter59 View Post
In your short block measure the distance from the top of the block to the top of the piston at TDC. You probably will have .025. This area from the bottom of the head to the top of the piston at TDC is call Quench.
Ummm, not altogether correct. The distance from the crown of the piston to the block deck where the heads bolt on, with the piston at top dead center, is called Piston Deck Height, not to be confused with Block Deck Height, which is the measurement from the centerline of the main bearing bore to the block deck where the heads bolt on.

Quench, also called Squish, is the distance from the piston crown to the underside of the cylinder head WITH THE HEAD GASKET IN PLACE and the piston at TDC. It is the sum of the piston deck height and the gasket thickness.

Quote:
Originally Posted by cdminter59 View Post
The recommended Quench is .040.
Ummm, actually, 0.035" to 0.045" is acceptable to most builders. I believe David Vizard found the limit at around 0.027", where he encountered a piston/head collision. I have no idea what the weight of components was, so that is another variable.

Not trying to give you a hard time CD, just trying to keep the nomenclature correct so that those who are learning from reading these threads will get it correct.
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