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                           JabiruEngine-List Digest Archive
                                      ---
                     Total Messages Posted Sun 06/02/13: 1
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Today's Message Index:
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     1. 06:15 AM - piston pin offset  (mike p)
 
 
 
________________________________  Message 1  _____________________________________


Time: 06:15:20 AM PST US
From: mike p <mymvagusta@yahoo.com>
Subject: JabiruEngine-List: piston pin offset

For those who are interested,
I scrutinized all the information I had saved on this topic, (as well as ca
lled and talked to the =9Ctech=9D people at a few Piston manufa
ctures),
In every case the conclusion I draw is
=C2-
The pin will TRAIL the crank rotation not lead it.
(If your goal is to minimize slap) 
=C2-
This is regardless of how you are viewing the engine, where the intake/exha
ust valves are, which way is =9Cup=9D, or anything else.
=C2-
=C2-
http://f1.grp.yahoofs.com/v1/LGyOUSKspbjjDMgHK6qpOP_qfkWMaV0Ft0Zc6A6FZFzVZx
ghgIm41VsoNaR_ssN3MkxzAtks0E8Xfx3DBnysOvYKmDfPJXYL/Piston%20offset.pdf=C2
-=C2-=C2- Leading Juabiru (manufacturer)
http://restorersscrapbook.com/?p=173=C2-=C2- pin offset trailing rota
tion
http://www.924board.org/viewtopic.php?p=279002&sid=59ff63380e2b5e7401db
e3a5e0f21980=C2- trailing 
http://forums.nasioc.com/forums/showthread.php?p=33776928=C2-=C2- tra
iling
http://www.jepistons.com/TechCorner/Pin-Offset.aspx=C2- trailing
http://www.rosspistons.com/index.php=C2- trailing (MANUFACTURER)
http://www.hainesengineering.com/rhaines/corvair.htm trailing
=C2-
=C2-
If their consensus is that piston pin should lead the crank rotation to max
imize power, I believe them. 
(Incidentally the same way that Jabiru (by accident or design) specifies th
e pistons should be fitted).
=C2-

 

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