Need help figuring up piston cc's needed

[edbaus]

Looking to make some 2.2L pistons for a turbo.

What I need to know is what the dome cc's are supposed to be to give me about 7.3:1 compression ratio.

What I have heard is that the heads (2.2L twin plugged) are approx. 69cc's

The piston skirt gap is 1 mm.

If this is correct, then it looks like I need a 9cc dome.

This seems odd. I would have thought I needed a dish.

Anyone see a problem with my calculations?

Thanks

Ed

[cgarr]

I think you might plug in your numbers here and come up with the dome you need? might have to convert some to mm

http://www.csgnetwork.com/compcalc.html

[kstylianos]

Assuming bore of 84mm, stroke of 66mm, deck height height of 1mm, and your given head cc of 69: Piston dome needs to be 16.5cc for 7.30:1 CR

Changing deck height to 1.25mm: Piston dome needs to be 18cc for ~7.31:1 CR

I can send you the .xls file to make these calculations easier.

[edbaus]

Does anyone have a set of 2.2 or 2.4L heads that they can cc for me. Mine are out and I want to make sure that 69 is right.

Thanks

Ed

[2.7RACER]

Ed,
I came up with the same as Charlie, 16.4 dome with a 1mm deck height.
Bruce Anderson says "the 2.2 to 2.7 heads are in the 68mm range"

[edbaus]

Does anyone have a set of 2.2 or 2.4L heads that they can cc for me. Mine are out and I want to make sure that 69 is right.

Thanks

Ed