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Main : Misc A12 industrial engine OEM piston dish

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A12 industrial engine OEM piston dish
A12 industrial engine OEM piston dishPopular
SubmitterfemtnmaxMore Photos from femtnmax   Last Update2008/12/15 2:49    Tell a friendTell a friend
Hits1889  Comments2    0.00 (0 votes)0.00 (0 votes)
Piston dish is 6 cc.  Decked block for piston 0.006 inch above deck.  Felpro head gasket is 0.041 inch compressed, so quench clearance is 0.035 inch.

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Poster Thread
A14force
Posted: 2008/12/15 6:15  Updated: 2008/12/15 6:15
No life (a.k.a. DattoMaster)
Joined: 2003/12/3
From: Christchurch NZ
Posts: 3706
 Re: A12 industrial engine OEM piston dish
.035 is getting pretty tight. I read a thread at moparts which was saying that 40thou was about right. I guess datsun A12's aren't quite the same as 440's lol.

Poster Thread
ddgonzal
Posted: 2022/3/16 6:36  Updated: 2022/3/16 6:36
Moderator
Joined: 2001/5/3
From: 48 North
Posts: 31575
 Re: A12 industrial engine OEM piston dish
0.035 inch is good for a precision small-bore engine like the Datsun A12. Precision as in tight piston-to-bore clearances which reduces piston rocking at high RPM

35 thousands is good, 30thou is even better and makes about 2% more HP than 40thou. That's like the gain from a 1 point compression increase. And all without causing more detonation. Like an octane booster!

See Quench