[Fot] quench clearance

[Rick Parent]

.035 is fine with the stock gasket. 

    On Monday, July 30, 2018 6:08 PM, John H. Hasty via Fot <fot at autox.team.net> wrote:
 

 Not apples to apples, but just for info. We used a squash of .020, no gasket, O ring, & turned 13 to 14 rpm with our 2 stroke 250cc motors. Cannot remember the cc’s for the heads. But it took many, many hours with 400 wet paper, WD40 & a surface plate to achieve the desired combo.

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On Jul 30, 2018, at 4:56 PM, fubog1 via Fot <fot at autox.team.net> wrote:


If you have good race rods and all of the clearances are to spec, you could pop it up a few thou but I wouldn't go any less than .030.Yes you can run it a little tighter but that's the point where there won't be any carbon buildup on top of the piston, and all it takes is a missed-shift to turn it into junk.
Considering that the gasket may compress a few thou, depending on what gasket you're using, you'll likely be fine with 0-deck, as you're planning.Glen


-----Original Message-----
From: don--- via Fot <fot at autox.team.net>
To: fot <fot at autox.team.net>
Sent: Sun, Jul 29, 2018 7:27 pm
Subject: [Fot] quench clearance

Amici, 
Building a small journal 1296cc Spitfire.Running Venolia’s over Carrillosbeen know to go to 8500K rpm (occasionally).
Going to have the block/pistons decked to zero. (can someone tell me a better way to say this?)Anyway, I realized that my quench clearance would be the crush thickness of the head gasket..035 ~.0385In the Comp Prep manual it states .025 as plenty of gap. 

Just want to see what y’all say.Thanks, Don

DON COUCH PHOTOGRAPHY
www.dcphotos.com
(512)-680-3540
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