sprbxr

I am converting a N/A 3.6 964 to turbo setup. I want to keep the displacement at 3.6L. Is there a piston/cyl that is recommended for this application?

Metal Guru

You should take this question over to the 911 Turbo forum. Us 964 Turbo owners don't even change our own oil, it turns out
By the way, what is a piston?

JamesE

I wouldn't use JE psitons, so stick with Mahle or Omega. Perfect Bore barrels are a good choice. You could speak to my builder to see if he has a good used set, PM me if you want his details.

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Jerz

Hi . I am gathering parts and info for similar project. The obvious options are 993tt, 3.6 965 , JE and other custom pistons, and even milling your stock 964 pistons. The last has been done by some big name tuners, so do your research. What CR do you want to go with? There is tons of info on PelicanParts board.

Metal Guru

Some good info here: http://forums.pelicanparts.com/911-e...964-motor.html

Colin 90 C2

Ruf cut down the stock pistons for the RCT. There is a lot of meat on the stock piston tops.
Are your plans for a single turbo or twin?
what are you going to use for engine management?
I have done tons of research on the subject.
I have also done tons of parts collecting. Just not enough time to actually complete the project.

sprbxr

Twin Turbo. I have an EFI Technology system now but I am thinking about going MOTEC. I think I am going with the 964 pistons milled down for lower compression. Going to build my exhaust and intake plumbing. Probably build the IC too. Not sure about the intake yet. Have a few different options at the moment.

grsilvia1

I have a 90 C2 that was turbo'd in 2002. The factory pistons were machined down to ~8 to 1 compression with factory cylinders. I had to replace the rings and pistons in 2007 as most of the rings were broken (the motor was burning oil, as you can imagine). I used 8.5 to 1 JE pistons and Goetze rings with the same cylinders and all is well so far.

I'm running a T4 Garrett/intercooler and 10 psi. When the motor was first done in 2002 it put out 410 hp on an engine dyno with 7 psi. Not sure where we are now.

Hope that helps.
-Gary

IrocMan

Hi,

James, why not using JE pistons ?

cheers

JamesE

I forget the materials, but in simple terms, as I understand it, JE are stronger but expand more than Mahle. So when cold they "slap" quite badly. I now use Omega which are better than JE and Mahle and don't slap.

Charles Navarro

The JE Piston is made from 2618 which has no silicon, which means it expands more than a Mahle piston, which is more similar to a 4032 high silicon forging, which expands less. The problems experienced over the years with JE pistons and Mahle cylinders stem from running them too tight (treating them like Mahle pistons). Yes, when set up with the appropriate clearance, then can be noisy in a Mahle cylinder when cold. JE doesn't offer a 4032 forging, where other manufacturers do in a forging suitable for a 911.

When we were coming up with the alloy for Nickies, we were building around a JE piston's 2618 forging and expansion rates, so a JE Piston is perfect for use in Nickies, where a Mahle piston can be noisy in a Nickies cylinder!