What does tolernace group 0 mean? hurry

[jkrustchinsky]

im looking at a set of pistons and rods, its from an 84, the rods are forged, ive heard that the forged rods are stronger and desirable when building a strong motor. the auction says they are tolerance group 0. what does this mean. im not familiar with terms yet. thanks josh

[idontknow]

There are 6 tolerence groups for pistons.

Group 0 was 99.98mm pistons
Group 1 was 99.99mm
Group 2 was 100mm
Group 1 0 was 100.48
Group 1 1 was 100.49
Group 1 2 was 100.5

The groups were made to match up engine case castings to better fit the pistons.

Aren't all the rods forged? Forged pistons may be what you're looking for?

[jkrustchinsky]

im not yet familiar with different internals, are there forged pistons? i just plan on picking up a set of good pistons and rods desirable for building a motor later on down the road. thanks josh

[idontknow]

There are forged pistons, the turbos had em and possibly some 83 models had em.

The turbo pistons are a lower compression though if you're looking for pistons that could take a beating, those would be them.

Someone posted a while ago that early 83 944s had forged pistons but never found a hard reference.

[legoland951]

I don't think any of the 944 series pistons are forged. I know the early cars have forged rods and all late 944 2.5L rods are NOT forged other than the turbo.