Originally Posted by Chip-3Door
Originally Posted by JjCoDeX75
Right - I think I have it - In Jamesspeak, if the compression ratio is higher, then the fuel is compressed more. There is a point where that compression leads to knocking as you efectively cand retard the ign enough to compensate ???
JJ
Kind of, but bear in mind that its more about the burn, and the extra gas that releases and how that interacts with the compression ratio, even at 20:1 you wouldnt see det from comrpession alone.
Okay - I always understood the ignition advances role to ensure that the combustion occurs just after TDC (so that the piston and rod is pushed down nice and evenly, and creates optimum power). I dont think I am quite following exactly how the compression ratio affects the burn, other than if the compression ratio is lower, it had more space to create the combustion reaction.
I am having a 'Durrrrr' moment!
JJ