Piston Pin Bushes
Piston Pin Bushes
(OP)
Interested in the opinion of others as to the practically, and suitable materials, for the manufacture of bushes to be inserted into a piston pin boss to allow use of a smaller piston pin. Hoping to adapt a piston with 16mm pin to a crankshaft with 14mm pins. Initially thought bronze to be a suitable material, but is steel an option.





RE: Piston Pin Bushes
Looks like VW deezuls did as recently as 2004. Looks bronze-y, but there are dozens of flavors of bronze.
https://dyw03owr7vs3n.cloudfront.net/public/assets....
I think some efforts to bush high performance Corvair car pistons didn't work out well. I believe differences in thermal expansion and heat transfer from piston to bushing were suspected as issues.
http://www.speedtalk.com/forum/viewtopic.php?p=895...
Have you investigated modifying the con rod for the larger pin? That gives you the option of equalizing the rod length, and creating a straight rod without resorting to bending the conrod to correct misalignment.
RE: Piston Pin Bushes
RE: Piston Pin Bushes
Correct.
RE: Piston Pin Bushes
Some have quite elaborate measures to feed some oil to the wrist pin bores.
http://www.racetep.com/media/wysiwyg/others/jeopti...
http://www.us.mahle.com/media/motorsports/features...
http://www.us.mahle.com/mahle_north_america/en/pro...
http://www.mooregoodink.com/news/wp-content/upload...
Also, pictures of uses wristpins often show pretty significant surface changes in all regions. Wear and heat discoloration.
http://www.928sg.com/images/wrist-pins.jpg