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Quench
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Posted: 10/26/09
01:26 PM
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How important is quench to you on an engine build? What do you believe is the proper thickness for quench?
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GibTG
Moderator
| Posts: 1904
| Joined: 10/03
Posted: 10/26/09
02:31 PM
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It's really important, and it should be to everyone - it is no secret.
"Quench" clearance depends on the application, naturally. Aluminum rod engines obviously cannot have a static piston-to-head clearance of .030". Some engines with very heavy forged pistons may not appreciate a quench of .030" at high speed either.
That being said, .040" is usually a decent "magic number" for most steel rod applications, but if the engine can handle a slightly tighter clearance that is great - it will make more power.
Clearances of .050" or above are too loose, it costs horsepower on the top and bottom, poor fuel economy and "dirty" combustion.
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Jake_S
User
| Posts: 124
| Joined: 09/09
Posted: 10/26/09
03:35 PM
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Gib,
What's your method for measuring quench?
Jake
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Posted: 10/26/09
04:00 PM
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I would say its still a secret to most of the newbies building engines. They'll ask about what type of head to use,help pick my cam,etc. If some of these people are willing to pay hard earned money for aftermarket heads,cranks,etc then dont you think they should get the most from their engines by using quench to its full benefit?
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Posted: 10/26/09
04:23 PM
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Here is a decent article:
http://www.chevyhiperformance.com/tech/engines_drivetrain/shortblock/94138_piston_head_clearance_guide/index.html
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Posted: 10/26/09
04:32 PM
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Maybe that article will enlighten somebody to how an engine works but I was hopeing to start an informative thread.
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GibTG
Moderator
| Posts: 1904
| Joined: 10/03
Posted: 10/26/09
04:33 PM
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Jake,
A dial indicator and a deck bridge.
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Posted: 10/26/09
04:50 PM
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I measure to see how far in the bore the piston is,then deck the block accordingly,head gasket compressed thickness is easy all I do is look it up in the book. Then for me its simply subtracting how far out the cylinder the piston is from the head gasket compressed thickness. EX:.038-.007=.031
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Jake_S
User
| Posts: 124
| Joined: 09/09
Posted: 10/27/09
12:18 PM
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gettn, glad to see someone knows the proper way to measure quench. A dial indicator and deck bridge will only get you so far.
On a side note, I seemed to have "lost" to posts off of this thread.
Jake
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Posted: 10/27/09
02:07 PM
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you also have to keep in mind what you need your dynamic compression to be. Quench is only part of the equation when it comes to modifiying the engine
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