oversize small end wrist pin bushings
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is it a possible thing to aquire oversize small end bushings? my con rods have been enlarged but oversize bushings don't seem to get listed.
cheers-Jim
cheers-Jim
36/6612
1967 S3 Coupe (left the factory in 66)
original rego PPC 8E
original owner B.M. Wetherill ..are you out there?
1967 S3 Coupe (left the factory in 66)
original rego PPC 8E
original owner B.M. Wetherill ..are you out there?
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dgym - Third Gear
- Posts: 358
- Joined: 05 Apr 2014
dgym wrote:is it a possible thing to aquire oversize small end bushings? my con rods have been enlarged but oversize bushings don't seem to get listed.
cheers-Jim
some people may use that kind of trick for offsetting pistons... as mentioned above cost are likely to rise when some machining is required: have your conrods been enlarged true and square, or is it the result of an incident? if the former the cost should remain reasonable (Si Bronze, or possibly Al Ni Bronze - clearance will likely need to be larger than with the factory backed bushings so that tolerance is proper at operating temperature - 1 thou or a bit more would be my guess) .
Bill Bradford, one of the Denver, Colorado, based engine builders has developed a scheme where he machines the connecting rod, small end bushing bore to accept an oversized bushing. After installation of the oversize bushing, he machines the bushing ID off center, towards the connecting rod big end, and gains additional piston to deck clearance. Bill says that up to .015" can be gained using this method. Although not sanctioned by the SCCA, as an approved modification, it has become the preferred method of gaining additional deck height in Rocky Mountain Vintage Racing. It is the opinion of RMVR's and Bradford's that the .015" shorter connecting rod effective length provides no performance advantage.
S4SE 36/8198
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nmauduit - Coveted Fifth Gear
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- Joined: 02 Sep 2013
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