Andrew Wojteczko

Hi,

We're in the process of building our race engine, we fabricated our con rod balancing fixture and successfully balanced all 4 rods to less than a gram.

However, our brand new pistons are causing a problem. One of the 4 is from a different manufacturing date, and is 20 grams lighter than the other three. These are Porsche OEM pistons, and do not appear to have 20 grams of material to be removed.

Has anyone seen this, and if so, been successfully able to remove this amount of weight?

If not, does anyone have a piston in stock that I could compare manufacutring dates to, and possibly complete our set with another close match?

Thanks,

Andrew Wojteczko

J Chen

That heavier peace must be
from a different production batch.
I'm surprise at the massive weight
difference. Are these forged pistons ?

Andrew Wojteczko

Yeah, me too

I believe the factory pistons are forged.

m42racer

Another option is to replace the Pin for a heavier one. Pins are less expensive than Pistons, can be purchased individually, and even made to suit the required weight.

Tom M'Guinn

Turbo pistons are supposed to be 730 +/- 4 grams. If you have one that is 20 grams lighter, it is probably the wrong piston or way out of spec. I'd return it if possible.

Andrew Wojteczko

Got another piston, this one was at 735, brought them all down to 730.5 +/- 0.1g. Should rev real nice.

Andrew Wojteczko