Question on Pistons....

[Chris A]

From what I've seen of the Mahle pistons, they all have the same great cosntruction. But I can't guarantee these pistons will.

[sleeperred90tgp]

Go to the Mahle site and decide four yourself. There on the same page so I would assume they have the same charestisic. Didn't see one that suits you perfectly although there is a 599810 with no specs.

Be carefull. Who ever gave you that 3'' dish distance for the 60 piston is wrong. It's 2.795 on the std and +.040. The distance for the 50 could be wrong to. Thats the one spec that I couldn't find on ther site. In the picture they look the same.




http://www.mahleinc.com/obj.nsf/479CBD429BAE04CA85256C390040EBE1/$FILE/2003-04%20MAHLE%20CATALOG%20P.15-60.pdf

http://www.mahleinc.com/am_na/am_na.nsf/out/1.5.0.0?OpenDocument&6,447571E-02

Jud

[Mick]

I believe you could use the GEN III 3100 piston design if you desire to stick with a hyper rather than forged using the iron heads.

They offer an increased compressed height over the 3.1 MPFI piston, which results in a static compression ratio increase with aluminum heads from 8.9:1 to 9.6:1.
Pretty safe to assume that this 0.7 increase would also apply
when an iron head is used rather than the alum. head.

Using the 3.1 MPFI piston (either NA or TGP) with iron heads will result in a cr (< 7:1) which is really not advantageous for anything other than a high boosted strip application, since it would not be very steeetable due to the lack of off boost torque.
The 0.7 increase would not just make this a more feasible approach from a cr standpoint, the increased compressed height was employed when GM finally caught on to the fact that optimized piston quench was actually an important factor in engine design. :)
Thus, by using the GEN III piston design with iron heads, your quench height should also be close to optimized.

Optimized quench translates into a decreased detonation threshold, which allows one to obtain a marked increase in boost levels without the corresponding increase in fuel octane that would normally apply.