[Fot] quench clearance

[John H. Hasty]

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.

Sent from my iPhone

On Jul 30, 2018, at 4:56 PM, fubog1 via Fot <fot at autox.team.net<mailto: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<mailto:fot at autox.team.net>>
To: fot <fot at autox.team.net<mailto: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 Carrillos
been 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 ~.0385
In 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<http://www.dcphotos.com>
(512)-680-3540

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