Originally Posted by
AndreasIt can't be that low.
The diffrence from a GTIR and a DET-DE with the same stock DET piston is 8.3 to 1 GTIR and 8.5 to 1 DET-DE. ( GTIR and DET motors share the same turbo piston the head making the diffrence in compression, GTIR head with slightly larger CC chamber )
You put a VE head on a DET or GTIR block you will get 9.3 to 1 compression. ( GTIR piston and DET piston being the same and since the VE head colume is constant the compression will be the same )
So, if you have a VE with 9 to 1 compression and you put on a GTIR head the diffrence should go down to 7.9-8 to 1 compression.
I did not use a calculator I just use some common sense. Maybe I am wrong, but the numbers add up.
That means I have the wrong number for the GTiR head, should be about 48cc, and the CR with about 0.5mm off the block would be about 8.6:1
Sorry for the wrong number before. It is a large excel spreadsheet to run what if's, and it gets easy to make mistakes.
Mike