Opinion needed from the engine masters

[Dpmulvan]

Before I install these wrist pin bushings is there any advantage or disadvantage to leaving them 1.5mm wider than stock? I can throw them in the lathe turn them down to stock width or leave them alone. Is the small added surface area hold any advantage? Or just the disadvantage of more surface area friction.

[brighton911]

I do not consider myself a master but that said, the bushing is to be no wider than the rod eye. But in your pic, the new one looks to smaller on the OD than your old one. And measuring on the screen (not accurate) they are about 1 mm smaller. 3.0 and 3.2 wrist pins are not the same size, are you sure you have the correct bushings ?

[Neil Harvey]

I'm pushing my limits stepping in under the guise of been a master too!!!

Actually is doesn't matter. In a stock engine the rod is guided at the crank end and the pin boss spacings are wider than the side clearance at the BE. Just check this and you are good to go.

Don't forget to drill the oil holes, chamfer the holes in the ID of the bushing and chamfer the pin ends.

Make sure the interference of the new bushing is correct and its always a good idea to make sure the CCL are all the same. Typically there is some material left in the bushing ID to allow for some adjustment. Even if this is a street engine, its a good idea to give the pin some extra clearance.

[Dpmulvan]

Originally Posted by brighton911

I do not consider myself a master but that said, the bushing is to be no wider than the rod eye. But in your pic, the new one looks to smaller on the OD than your old one. And measuring on the screen (not accurate) they are about 1 mm smaller. 3.0 and 3.2 wrist pins are not the same size, are you sure you have the correct bushings ?

Bushings are same size OD it’s the computer, color, angle and inside diameter difference that makes them look different. Stock bushings on a 3.0 are wider than than the rod, they stick out a couple mm on each side.

[Dpmulvan]

Originally Posted by Neil Harvey

I'm pushing my limits stepping in under the guise of been a master too!!!

Actually is doesn't matter. In a stock engine the rod is guided at the crank end and the pin boss spacings are wider than the side clearance at the BE. Just check this and you are good to go.

Don't forget to drill the oil holes, chamfer the holes in the ID of the bushing and chamfer the pin ends.

Make sure the interference of the new bushing is correct and its always a good idea to make sure the CCL are all the same. Typically there is some material left in the bushing ID to allow for some adjustment. Even if this is a street engine, its a good idea to give the pin some extra clearance.

Thanks for your input Neil.