can anyone tell me what is different in a 6g72 turbo and a 6g72 non-turbo engine besides the camshaft. where do the different comp. ratios come from. a couple exhaust valves staying open a little longer than the other doesn't seem to me to account for this difference.
i've looked through every manual i can find on the two engines and this is the only difference i see.

 

They are a lot different, heres a list

1) Intake plenum air flow
2) Head CC's, flow on those heads is lower, not as efficient
3) Yes cam profile is much different
4) Different types pistons, which explain the higher compression, which is one of the many reasons you can not run much boost.
5) Connecting rods, along with crank

I'm sure there are other smaller difference, but thats just a quick run down of some of the internal differences, hope that helps.

 

thanks, this does help. i want to find an engine to build up and switch w/ the one in my vr4 which has alot of miles on it. i'm just wondering if i can start w/ the n/a short block and build on the top. i'm used to american cars and may ask some dumb questions, but if the engine id #s are are both 6g72 it would have to share the same short block right?

 

No they are not the same short block or even the block at all. If you are going to take time to build your own motor just make sure its a 4 bolt bottom end, and a 6g72t (turbo motor).