Floating Pin Pistons with Press-Pin rods

[ieatrice]

Somebody keeps arguing that pistons that were designed for floating pin rods will work with the pressed pin rods... is this true?

Mahle only makes press-pin pistons for the standard bore... being my problem.

Also has anyone used the Keith Black pistons for our engines?
Part #KB268
Would I be able to use these pistons with my press-pin rods?

[MoparBoyy]

full floating wrist pin pistons use a snap-ring or something to hold the pin from coming out the side of the piston.. press in style don't have that option. I'm not positive, but i would never interchange the two. KB pistons i have never used, i only use JE..

ANYONE OUT THERE USE THEM? i would like to know more about them myself

[MM Racing]

Mahle does not make only pressfit pin pistons in the stock bore. The 2.5 uses a common bloxk which uses the same rods as a 2.2 turbo 2 which are the forged floating pin pieces.

Technically you could use a floating pin piston with a non floating pin if you had the small end of both the rod and piston machined to the proper tolerances.

WHy would you go with KB pistons? Are you talking about the Silvolite brand name? I beleive those are hypercraptatic. Whats wrong with Venolia, Ross, Wiesco, and JE all of which have been used before succesfully in a 2.2 liter.

Ian

[ieatrice]

Mahle doesn't make 2.2 pistons for the pressed rods in anything but the stock bore, so I'm looking for alternatives. I hate those friggen clips, and forged aren't an option.

[MachineHead]

You can use the Mahl's with a pressed pin. The pin will be held in place by the rod, so you can get rid of the clips. The pins will need to be pressed in by a machine shop this way though.

[ieatrice]

That's what I want to hear! So I can buy the Mahles (that claim they're for floating pins) and use them with my '85 fixed pin rods? Just don't use clips?

[MachineHead]

Exactly. What they really mean when they say the pistons are for floating rods is that they have grooves cut for the clips. You can safely use them with the 85 rod and no clips.

how about the other way around press pin pistons with floating pin rods? could u just get the wrist pin machined to fit?

[MachineHead]

Quote:

how about the other way around press pin pistons with floating pin rods? could u just get the wrist pin machined to fit?

That way won't work. Press pin pistons don't have any way to hold the pin in. It would just slip to the side right away and ruin the cylinder wall.

You could get the pistons machined for keepers to hold the pin, but unless you already have the pistons, it is easier to buy the correct type.