Turbo 3.6 P&C's in a 964 motor?

[WydRyd]

Would 100mm turbo P&C's from the 3.6 Turbo 965 or 993TT slip right into a 964 motor, or are the heads different and would require machining to make them fit?

[beepbeep]

Certain year of 993TT engines have dished heads where part of piston goes into the head.

But if you only install the pistons and leave the rest as it is (=use 964 heads and cylinders) I believe it will work.

[WydRyd]

Thanks, Goran. Finding 993TT pistons is like finding a pin in a hay stack

[Henry Schmidt]

Simply machine the tops of the 964 pistons to make the compression you want for your turbo.
We have done it many times with excellent results.

BTW: I think we have 100mm turbo pistons and cylinders for sale.

[beepbeep]

Originally posted by WydRyd
Thanks, Goran. Finding 993TT pistons is like finding a pin in a hay stack

No it's not I did it twice. Just check with companies that do big $$ tuning of 993TT's. Chances are they'll have a used set lying around since they swapped them out for JE's or Mahle Motorsports.

But frankly, why don't you just buy a set of JE's? They are less than half price of new set of OEM 993TT's...

Also, when running 993TT pistons in 3.6 with hot cams, you'll probably need to machine valve pockets on pistons somewhat deeper.

[red9]

Wyd- I have a new set of 993 TT pistons that are for sale-- very convenient to you!

[Henry Schmidt]

BEFORE 11.4:1 compression


AFTER 8.5:1 compression

[Lukesportsman]

Cool Henry. So Mahle doesn't have hollow domes? How thick are the top of the pistons after machining them? I know some aftermarket, different marque pistons follow the outside shape internally to some degree. Obviously not to closely with the 993's......handy.

[Henry Schmidt]

It varies. We put a slight dome on the pistons for more compression and better flame propagation and that leaves the dome at around .300"+.

Cut them flat for 7.5:1 you get around .280".

[sprbxr]

Resurrecting this thread from the dead.

Henry

Is the .280" this new thickness of the piston crown?

Any room for increasing valve pocket on the top of the piston?

Thanks

[Henry Schmidt]

Originally Posted by sprbxr

Resurrecting this thread from the dead.

Henry

Is the .280" this new thickness of the piston crown?

Any room for increasing valve pocket on the top of the piston?

Thanks

When cut the dome thickness is in excess of .280" . 280" is the number I use for minimum dome thickness for a turbo charged engine.

[sprbxr]

gotcha.

Thanks.

[911TT33]

Resurrecting this thread from the dead too.

Henry, what do you charge to machine 964 pistons down to 8.0:1 C/R?

Also, what do you charge to have the set of 964 cylinders and heads flame ringed?

[Henry Schmidt]

I may already have a set of pistons to suit your needs sitting on the shelf at a reasonable price. give me a call on Tuesdays.

As for flame rings: ever since we started using Supertec head studs, we find that flame ring heads are unnecessary.

[911TT33]

Originally Posted by Henry Schmidt

As for flame rings: ever since we started using Supertec head studs, we find that flame ring heads are unnecessary.

Interesting. At what boost levels though?

[Henry Schmidt]

Originally Posted by 911TT33

Interesting. At what boost levels though?

A few years back one of our customers made 846 crank hp @ 1.2 bar from his 3.4.
The heads were torqued to 34 lb and upon regular freshen ups showed no sign a head movement or compression release.

[911TT33]

That's impressive! My motor is already running ARP fasteners.

The 3.6 question was related to another project I've got in mind

Curious, how much does it typically cost to bore Nikasil jugs from 95mm to 98mm and replate? Is this something you also do?