Originally Posted by
Rob_DOHC
I guess the above is talking about peak power... making peak power at high rpm = high comp etc...?
as i cant see the problem with having a high compression ratio and reducing advance at high load to eliminate det as most modern cars seem to do?
If you do that on big boost, you will end up with high EGT's as a result.
As far as i understand it, CR vs Advance is a bit of a trade off, its whether a high compression ratio with less advance makes the same power as a low compression ratio and more boost. There are many obvious advantages to having a higher compression ratio.
Is that correct Chip?
Yes, but if you end up retarding the timing too much the power you are losing is because the burn hasnt happened quickly enough in the cycle so the energy ends up as heat rather than used to push the piston down.