2.2T piston upgrade question

[Dangqd]

Hi all,
I have a 1971 911 2.2T that needs rebuilding. I was wanting to replace the 2.2T pistons with JE 2.2S pistons to increase compression. Can I do just this without changing anything else (no changes in cylinder heads/crankshaft/cam shafts). Thanks for everyone's help in advance.

[BK911]

Yes. Check for valve clearance but you should be fine with the stock T cams.

But, while you are in there...

I would go with a 2.4 crank/rods and E cams. Vroom vroom!!

[Dangqd]

Thanks. I want to keep it simple. High compression pistons don't seem to much different in cost from the low compression ones.

[jpnovak]

Just be careful as the JE pistons may have too much dynamic compression. The T cam does not have as much lift, nor rate of lift during opening. This can create a situation where you have too much dynamic compression at low rpm which can cause detonation. You might want to consider a different cam to match your higher compression pistons. Even an E cam or Solex would do wonders for the engine for not much cost input.

[T77911S]

^^what he said.
the E cam would be nice or up to a 2.4

sorry, i am not a fan of the JE pistons. they dont have the offset the mahles have. i have also heard they can be noisey at startup when cold.

[kenikh]

JEs are fine. And yes, change cams. E or Solex. I have a spare set of Solex cams and your be shocked how much they wake up a motor with S pistons AND they work awesome on T port specs.