Pressed vs bushed rods? ---

[alwayscode390]

I am starting to learn a little about the bottom end of the engine ... whats the advantages or disadvantages of going bushed vs pressed pins on the rods? I noticed the bushed are slightly more expensive. Thanks guys ---

 

[ffmeltdown]

Re: Pressed vs bushed rods? ---

Basicly divides the friction between 4 points (bushed) or 2 points (pressed). Bushed is slightly less friction.

 

[alwayscode390]

Re: Pressed vs bushed rods? ---

Great explanation, thanks ... now do you have to have a certain crank or pistons to use either style ... or are they pretty much universal? ---

 

[ffmeltdown]

Re: Pressed vs bushed rods? ---

The connecting rods will determine if they are pressed or bushed. the piston/wrist pin universally floats in the piston on all designs. Its the rod that is machined differently at the small end. Does not affect the crank end in anyway.

 

[turbodig]

Re: Pressed vs bushed rods? ---

I am starting to learn a little about the bottom end of the engine ... whats the advantages or disadvantages of going bushed vs pressed pins on the rods? I noticed the bushed are slightly more expensive. Thanks guys ---

Unless you run a lot more revs than Sy/Tys normally run, you'll see very little difference in pressed vs. full float.

The really nice thing about floaters? You can take 'em apart/put 'em together without having a press.

 

[ffmeltdown]

Re: Pressed vs bushed rods? ---

Yes, above is true. But pistons intended for use with 'bushed' rods Ie, full-floating pins, have grooves machined into the pin bore for retaining rings. You don't have to use these grooves for pressed-pin rods if they are present, but they better be present for full-floating.

In a nut-shell: You can't use stock pistons with full floating pins. No pin retainer provisions. But I don't know why you would want to.

So, not only the rod is different, but the piston needs to provide retainer provisions as well.

Crap!! Sorry bout the misinformation!! Didnt think it through, been a while.