Can 911 cylinders be fitted on a type 4?, thinking aloud... Options

[Aaron Cox]

some cool materials available, along with some in between bore sizes....

things to worry about...
stud pattern?
lip where they meet the head?
Bottom where they meet the case?

just curious if it had been done, IIRC ive seen it...

[Jake Raby]

doing it as we speak... The only advantage to using them is if you need the extra head sealing capability of the RSR cylinder/Head gasket from the Big Turbo engine... OR if you want to run 911 heads. I'm doing it for 4 other reasons on this engine that I'll share later on another channel-

I am using a set of Charles' 911 cylinders in the 102mm bore size (3.8 RSR) to create a 2680cc Intercooled Turbo for a customer in Germany. We just started the case mods now and the project will take clear through May 2006 to finish because of so much one off work.. (FYI Charles has an RSR customer pumping 40 PSI boost through a set of these same 911 cylinders)

The key to make it all work you need to attach two pieces of blanchard ground Aluminum plate to the case with several different attachment methods and then rebore the new stud pattern into the plate as well as the cylinder registers. I used .700 Aluminum plate because the RSR cylinder is .650 shorter than a TIV cylinder from seating surface to seating surface and it will allow me the capability of creating equal length head studs to overcome another engineering faults that our buddies at VW gave us.....(wit till you see how we are doing this- you'll freak)

So....... Don't even think about doing this unless you have a full machine shop at your disposal- The normal person would never have to even worry about it- Just buy TIV Nickies and be done...

But making 400 Reliable ponies and holding 25 PSI boost is another whole world.... We need all the help and tricks we can throw at it. Hell I have 30 hours labor in it so far and I don't even have the welding and initial machine fitting done yet!!!!!