Super Charged Compression Ratio

[melhookv12]

Looking at different engines. I currently own a Jaguar XKR V8. Stand a Rd compression ration is 8.9:1. The piston and cylinder head are damaged. Piston not available.

The NA 4.0 litre has a compression ratio of 10.5:1.

What would be the issues using the higher compression engine ? Would I need to run less boost? Would pump fuel be OK to use.

Thanks for any replies.

[melhookv12]

GavinPearson said:

I would use a second hand piston.

The NA piston has way too much CR for the engine and isn't sufficiently strong.

Can't find a second hand one. No new stock from Jaguar. If I rebuild will probably go forged.

Thanks