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Old 04-07-2008, 07:17 AM
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Quench Clearance

Hey everyone I am just looking for a little information on engine terminology.

What exactly is "quench clearance"?

Thanks alot

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Old 04-07-2008, 08:49 AM
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Normally referred to as "quench" it is the distance from the top of the piston to the bottom of the cylinder head.

So if your piston is .010" down in the cylinder and your heads gasket is .040" compressed thickness, your quench would be .050"
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Old 04-13-2008, 10:43 AM
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lincoln Yblock

Hallam Quench area is important , 040 seems to be the magic number for good combustion with out detonation and to make good power and economy, i am building a LIncoln Yblock and we cut 040 off the cylinder deck to get it as near 040 Quench area as possible, Some engine building books like Speedomotives tell all about Quench area and why it is so important. hope this helps Rick Martin hydromatic
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Old 04-13-2008, 07:32 PM
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Here's the Speed-O-Motive link......
http://www.speedomotive.com/t-showbymodel.aspx
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Old 04-13-2008, 07:39 PM
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Some engines use the gasket as a Quench area,the term comes from the fact that the flame is is in effected Quenched as the burning gasses are forced into the combustion chamber.
Some of the engines I work on have the pistons protruding above the deck height by as much as 020.
The less quench you can run ,the less chance of preignition.
Chevs Need 040 Minimum Clearance because of rod stretch and crank whip ,both of which happen at high revs ( 6-9000 rpm).
When building an engine ALWAYS do a 'mock up build' and measure the crown to deck height and include a squashed gasket of the type you intend to use. Especially if you go with steel shim type. Nothing worse than the sound of pistons hitting heads....at idle. .I have had two 350 SBC's last week which had been rebored 030 and the pistons were .100 down the bore at TDC. Needless to say both ran like dogs at full throttle with loud detonation.
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