i'm confused reading this. someone mentioned that the 944 S2 is a 16v motor. Wouldn't that means the pistons are already configured for 4v operation since its a 4cyl motor?

 

Mark, 944 S2 and 968 have same 104mm bore, 88mm stroke, 2990cc and 16V head.

2.7L 944 (non S, last year model) has 104mm, 78.9mm, 2681cc and 8V head. This was done to allow factory to get away with just one piston style on non turbo four cylinder blocks. Or was it other way around, 100mm and 88mm.

Anyway. both 944 S4 and 968 pistons are usable.

 

I'm sure I saw a set of 968 pistons on ebay last week but there gone now, does that help?

 

I saw some 968 pistons the other day outside my work. they were still in the engine though (which was still inside the car). ok... so I guess I didn't really see the pistons themselves, but I assume they were in there

 

Mark, You may want to check the Pelican Board, sometimes they have 968 and S2 engine parts listed.

 

Thanks Scott,
That would be great. Yes I can use the S2 piston but I much prefer the 968.

 

It does if I can ever get my time machine working.

 

but, you have to cut valve reliefs on the 944S2 pistons, right? (944S2 is the 3 liter 2valve version)

MK

 

944S & 944S2 are both 16V engines.

 

H-P,
The 944S has 100mm pistons with 4 cutouts.

 

Let me guess. The time machine only needs some 968 pistons to get it going.

I guess they might not have as long of a sucess record yet, but aren't there one or more racers sucessfully using Nickasil plated blocks with custom forged pistons? Would that be a more economical way to go? Didn't Adam B. or Tony H. have some future stroker motor pistons laying around at one time? Might be worth checking with them.

 

There are some racers out there with the Nicasil method but as far as I know none approach the hours and miles I've put on the stock Ausil so I'll stay with stock. Yes the pistons are cheaper but the block prep is more so the overall cost is not much different.

 

I was thinkng 16 valver for 928s. what i should have said is 4 valve or 2 valve per cylinder. doesnt the S2 have 2 valve, not 4 valve per cylinder.

if it is a 2 valve and the 968 is a 4 valve, then the 2 valve pistons would have to be notched for the 4 valve. that was my only question. (point)

confused

mk

 

I know - I have one sitting right here on my desk. Just pointing out the S2 & S are both 4-valve pistons.

 

MK,
both the S2 and 968 are 3.0L with 4valves per cylinder. How many times do we have to say it lol


Why the 968's over the S2? forged vs. cast? I know nothing about modified 928 engines. I've seen Tom's ex-Tilo car at my shop, but that is it