What is the difference between 7:2:1 and 7:6:1 and 7:8:1 ??
I know they are different compression ratio but how is it worked out.
I may not want to go for the full 500bhp but in the future push to 400ish,
Does this mean maybe a not so low comp piston would be better.

This may sound like stupid questions to some but im a bit new to all this

Thanks