Quench
Thread Starter
Instructor
Joined: Sep 2006
Posts: 133
Likes: 0
From: Mt Pleasant Michigan
Quench
Once again my eyes hurt from searches
Lots of good reading though (mostly)
Anyway, is anybody running less than .039 quench area ( example: 0 deck with a FelPro 1010) or any other combo, KB pistons suggest .040 for the least some books say as low as .025-.030 Just wondering what some actual engines are running.
Thanks
Joe
Lots of good reading though (mostly)Anyway, is anybody running less than .039 quench area ( example: 0 deck with a FelPro 1010) or any other combo, KB pistons suggest .040 for the least some books say as low as .025-.030 Just wondering what some actual engines are running.
Thanks
Joe
Racer
Joined: Oct 2007
Posts: 478
Likes: 1
On my L98 I'm running the pistons .007" down the hole and the GM .028 head gasket. I'm currently shifting at the 6100 mark and with my new cam upping that to 6300rpm. I would not go less than a .035" quench as there is apparently no advantage to it. Most say .035" to .040" is good.
Thread Starter
Instructor
Joined: Sep 2006
Posts: 133
Likes: 0
From: Mt Pleasant Michigan
Den9omic85
Yes the 1010 is a .039 Gasket the original at least on some years (I have read, I think Alum Heads 87 up) is.051. My 85 had steal shim type (around .015- .020 I think), but that is the HUGE port 76cc head.
89 TransAm,
Are you running a stock bore or a fresh bore with your .035 quench?
Joe
Yes the 1010 is a .039 Gasket the original at least on some years (I have read, I think Alum Heads 87 up) is.051. My 85 had steal shim type (around .015- .020 I think), but that is the HUGE port 76cc head.
89 TransAm,
Are you running a stock bore or a fresh bore with your .035 quench?
Joe
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
Aside from theory, the quench distance should be between about
.037 and .044 (the distance between the cylinder head and the piston deck). If you run less than about .035, and at high rpm levels the pistons might hit the cylinder heads. If you run more than about
.044 thousands the quench effect of forcing the fuel/air mix to the center of the cylinder from the cylinders edge area looses both speed and effectiveness.
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Dead on. I usually go .005" in the hole and a felpro-1010 on my builds.
Some guys I know run sub .030", with a high silicoln alloy forging with very low expansion properties and H beam rods. I'm running the same, but I still keep it around .044" because even the slightest bit of expansion at high RPM and you might get a tap. really crappy forgings will expand tons.
-- Joe
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski