KiwiBacon wrote:darinz wrote:KiwiBacon wrote:The story is the system had several user selectable "power levels". Turns out the "most power" one wasn't so good for the engine.
So this is the same as having different boost levels and expecting everything else to cope. The whole point of a gas system is it puts in more fuel so unless you add more air the egt will go up.
Yes, that's exactly it.
darinz wrote: The detonation is caused by too much gas for the timing.
No, unlike a petrol timing is not the cause of detonation. The detonation is caused by the cylinder temperatures and pressures being too high for the gas.
We can't simply retard the timing to cope like a petrol can.
umm no
cylander presure is the reason for det in a petrol engine as well
and timing will not always fix it
run to lean ... you get det and burnt valves
run to rich .. you get bore wash
run to much timing you get det and burnt valves
run to little timing you get massive egt's
run to much compresson .. you get det
run to little compression.. it wont go
then we go onto cam phasing air intake temps the quality of your swirl and tumble boundry layer effects pulse tuning of the intake and the exhaust, valve material
there are so many reasons you get det its not funny in a petrol engine .. seriously
if all you have to do with a d is thrown in fuel and boost untill it goes bang then you have it easy
petrols and more specifically 2 strokes make d's look like kids playfrom a tuning aspect
so please ... dont make it sound like a petrol is eazy ... when its far from it
come on guys think about.... 
