4g67 head c/r?

[awdcsm]

iam looking to swap my 2g pistons out for evo 8/9 piston (the pistons that look similar 2 manley pistons)
and i have a spare 4g67 head (big ports/small cc) that am gona swap turbo shafts to,
my question is with a 4g67 head + evo 8/9 piston combo + stock head gasket what would my compression ratio be?

 

[93ETGOCART]

the 4g67 is a 1.8 head

 

[black_red_rs-t]

yea, it is a 1.8 head but its identical to the 2.0 head except for the cc size and the cams. (The cams are very aggressive down low) I ran a turbo 4g67 setup for a couple of years but I used the 4g67 9.0:1 pistons and just had them ceramic coated with a pretty thick cometic head gasket. Not sure on how to figure out what your ratio would be though.

 

[DSMTriad]

yea, it is a 1.8 head but its identical to the 2.0 head except for the cc size and the cams. (The cams are very aggressive down low) I ran a turbo 4g67 setup for a couple of years but I used the 4g67 9.0:1 pistons and just had them ceramic coated with a pretty thick cometic head gasket. Not sure on how to figure out what your ratio would be though.

The 4G67 head is always confused with the 1.6L 4G61 head. The 4G61 has the smaller 43cc chambers. Which would change the compression.

 

[BogusSVO]

the only way to know what your true CR is, is th measure/cc all ov it.

cc the combustion chamber = v1
cc the pistion dish =v2
measure the piston to deck clearance =v3
cc OR go off the published spec of the HG volume =v4
Mesure the Bore AND stroke (for swept volume) =v5

the formula will be
v1+v2+v3+v4+v5
---------------------- = CR
v1+v2+v3+v4

There are some online caculators that will do the math , but you still have to have all the measurements.