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Old 11-22-2012, 06:09 AM
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cobalt327 cobalt327 is offline
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Lets say for argument's sake that quench does nothing for performance or emissions or economy or to help prevent detonation.

When talking about the compression ratio of an engine, if a quench figure isn’t specified, then all the parameters would need to be listed individually.

An example would be saying the CR was based on a 0.040” quench, OR it would need to be stated that the CR is based on what the piston to deck measurement is, what the compressed head gasket thickness is, what the deck height of the block is, and what the compression height of the piston is along with what the chamber and dish/dome volume is.

So it is easy to see how using a quench figure that encompasses ALL the measurements (except the combustion chamber and piston dish/dome volume) is much simpler than listing each measurement individually.

BTW, the 0.040" quench figure is used because it's generally viewed as being optimum for a steel rod street/strip engine using a wedge combustion chamber. If the actual quench measurement in question is other than 0.040”, the difference in the CR can be easily found using a compression ratio calculator.

The same principals apply to proper valve train geometry. Sure- the engine will run most times using stock length pushrods. But is it somehow wrong to set the valvetrain up correctly? It doesn't cost any more for the right length p-rod than it does the wrong length p-rod, so what's the problem?

As far as "guys arguing over .005 in quench", "swirl port heads" and "talk about pushrod length for hundreds of pages", I'll chalk that up to hyperbole and maybe too much caffeine.

As to "I will use "Quench" for everyone that loves that word, but when you read it please remember i prefer Squish", squish and quench are two entirely different phenomena. So if you're going to preach at least get the terminology right. "Quench" is used for expedience only. Again, see Quench for more on the subject of quench and what it all really means.

But what you will not see me do is dumb anything down to make it more palatable for those too lazy or uncommitted to do the best job they can.

Last edited by cobalt327; 11-22-2012 at 06:14 AM.
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