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piston pin offset

 
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mymvagusta(at)yahoo.com
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PostPosted: Sun Jun 02, 2013 5:15 am    Post subject: piston pin offset Reply with quote
For those who are interested,<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" />

I scrutinized all the information I had saved on this topic, (as well as called and talked to the “tech” people at a few Piston manufactures),

In every case the conclusion I draw is…



The pin will TRAIL the crank rotation not lead it.

(If your goal is to minimize slap)



This is regardless of how you are viewing the engine, where the intake/exhaust valves are, which way is “up”, or anything else.





http://f1.grp.yahoofs.com/v1/LGyOUSKspbjjDMgHK6qpOP_qfkWMaV0Ft0Zc6A6FZFzVZxghgIm41VsoNaR_ssN3MkxzAtks0E8Xfx3DBnysOvYKmDfPJXYL/Piston%20offset.pdf Leading Juabiru (manufacturer)

http://restorersscrapbook.com/?p=173 pin offset trailing rotation

http://www.924board.org/viewtopic.php?p=279002&sid=59ff63380e2b5e7401dbe3a5e0f21980 trailing

http://forums.nasioc.com/forums/showthread.php?p=33776928 trailing

http://www.jepistons.com/TechCorner/Pin-Offset.aspx trailing

http://www.rosspistons.com/index.php trailing (MANUFACTURER)

http://www.hainesengineering.com/rhaines/corvair.htm trailing





If their consensus is that piston pin should lead the crank rotation to maximize power, I believe them.

(Incidentally the same way that Jabiru (by accident or design) specifies the pistons should be fitted).

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