any answer? Also whats the diff between pressed fit rods and bushed?

 

pressed pins are held in place by pressing them through the connecting rod. floating are held in place by snap rings. lt1 cars come with pressed pins.

 

which is best, and can you convert from press pin to floating

 

i really only have experience with pressed pins so i can't really answer this question. i pretty sure you could covert but you will need new pistons.

 

In a pressed fit pin/rod combination, the pin is larger than the small end of the rod by a very small amount, and is pushed into the rod with a press, or the rod end is heated to enlarge the pin bore, the pin and piston are assembled and the rod cools and shrinks onto the pin. The interference fit keeps the pin from moving back and forth in the piston. The pin cannot turn in the rod, so must rotate in the piston as the rod goes around the crank. This is the "pressed pin" or "pressed fit rod"; sme thing.

In a floating pin/rod combination the small end of the rod is a tad larger than the pin, just like the piston pin bore so the pin can turn or "float" in the rod as well as in the piston. A steel pin rubbing on a steel rod isn't too good, so the small end of the rod has a bronze sleeve or bushing pressed into it for the pin to rub against. Hence the "bushed' rod for the "floated piston".

To keep the floating pin from hitting the cylinder walls, retaining rings are put into grooves in the ends of the piston pin bores.
Yes, to convert from pressed pins to floating pins you would need to modify the pistons by machining the retaining grooves in the pin bore, and modify the rods by bushing the small ends. lots of work for a small gain.

IMO, modifying stock or inexpensive pistons for floating pins is a waste of money. Same for stock rods, since good, moderately priced rods are readily available. Pressed pins have worked just fine for some pretty healthy engines. If you get to the point of needing stronger pistons and rods, yes, do the floaters.

 

cool Because i was looking at a pistons and rods and couldnt tell so now I will purchase the floaters with bushed rods. Thanks for all you help. does floating give more hp?

 

Not that you'll notice, nor be able to measure.