997GT

Does 997.1 GT3 have forged pistons?

mr.horsepower

Yes, for improved combustion, the shape of the piston crown was changed and the overall shape was changed to make it lighter. In addition, the diameter of the piston pin was reduced from 22 mm to 21 mm, reducing the weight by approx. 30 g per piston including piston pin.
It has 100mm bore.

rbahr

I did not realize that there was a difference in piston / WP in the 3.6l motor after the 996.1 gen

I realize you are discussing the 997.1, but I was under the impression that it shared the same parts as the 996.2 motor...

Anyway, the big differences between the 3.6l, 3.8l, and 4.0l motors are:

• The 3.6l motor uses 130mm con rods, 22mm wrist pins, and 100.0mm pistons - the older 1st gen gt3 uses a shorter con rod ~127mm (I think)
  • the 3.8l uses the 3.6l crank with 130mm con rods, 23mm wrist pins, and 102.7mm pistons - the con rod is same length as the 3.6l, but the wrist pin is a bit larger in diameter.
    • The 4.0l introduces a new crankshaft with a different oil pump for clearance issues.

The OD of the 3.8l P&Cs is the same as the OD of the 3.6l P&C, which means that nothing needs to happen to the case. They just slip in!