4 replies to this topic

[dyshipfakta]

As above going to put a 12g295 on my 998 my calculations give me roughly 9.2 compression ratio. Will this be usable? My plan is a turbo conversion down the line but would like the option to do it in stages.

[DomCr250]

Standard 12G295 on dished 998 low compression pistons works fine - it will rev a little better but you wont get the power gains that a slightly higher ratio would give you.

 

So you might make a handful extra HP.

[unburntfuelinthemorning]

The compression ratio on non A+ non Cooper 998cc engines was only 8.3:1

[dyshipfakta]

That is what I was thinking to be honest I have just never driven one. Only high compression 998s. I’ll plonk it on she how she goes then. Thanks

[absx2]

It will be fine and you can use cheap super market fuel with no running issues.

I think the 998 cooper CR was 9:1 or maybe 9.4:1 so you`re pretty much on the money.