compression ration

Turbine · June 28, 2005

Hey guys, has anyone tried this setup

RB20DE bottom end with a RB25DE cylinder head.?????

I'd love to know what sort of compression ration this comes up with, or if they will actually bolt on.

Turbine

blind_elk · June 29, 2005

C/R will be much lower than the current RB20DE setup, because the combustion chamber of the RB25 is much bigger than the RB20's.

It will probably bolt on to the RB20 block, but will probably not work too well because of the additional bore diameter of the RB25.

FATAZZ · June 29, 2005

well can you bolt on a rb20det head on a rb25det bottom end?

and will it be good for the runs?

RB30-POWER · June 29, 2005

RB20 heads and RB25 heads are not interchangeable.

The RB20 has a smaller bore and also the water galleries are all out the shit, between them.

Turbine · June 29, 2005

RB20 heads and RB25 heads are not interchangeable.
The RB20 has a smaller bore and also the water galleries are all out the shit, between them.

Ok so it sounds like they just wont bolt up. No worries guys thanks for that, I'll try something else

Turbine

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