On a preseed fit wrist pin the rod end has to be heated and the pin pushed in, not something you want to do at home. On a bushed fit wrist pin the pin can be put in and taken out without the need of a machine shop to do it, spiral locks hold it in place. Both work just about as good as each other but the bushed pin in mainly for racers that tear their engine down a lot for freshening
Thanks Mike. stock engines have a pressed fit design, that ive seen.... so if you have pistons with lock rings included with them, you would need bushed fit? or will either work?
I am not 100% sure on this answer so dont crucify me if I am wrong. The pin size on a rod would be a different size than a pressed fit pin, the rod small end would have to have the correct id for which ever you are going with. You could possible take your rods and have the small end bored or just get new rods
Pins are smaller on floaters.You can have your stock rods bushed for floating pins. If you use a good machine shop it aint a biggie for em to do it.
Pin diameter is the same for both. The rod small end is bored bigger to accomdate the pin bushing. Pistons with spiro loc grooves can still be used with pressed pins. And pressed pins do not cause undue wear on the piston, unless something goes wrong. There are thousands of cases where stock pistons last well over 200K miles with pressed pins. Floating pins are nice to have, but not necessary for most applications.
Im building a 4.7 cid Jeep inline 6. Im just going to hone the rods and drill a oil hole, And run em. (full floating)
And installing Spirolocks are frustrating until you get the hang of it. They're even worse to get out.
