Originally Posted by YBP
Originally Posted by Stu @ M Developments
You must remember at all times, whilst the burn temperature of the mixture is a real issue and certainly the main reason we run richer than peak power, the advance curve of the motor changes depending not only the calorific value of the fuel but also its mixture ratio and its cylinder distribution. Leaning 0.5 of a ratio can bring on Detonation as the mixture starts to burn faster making you over advanced.
Your EGT gauge will normally not respond fast enough to show detonation, especially if its in a low speed area that isnt showing high EGT's anyway, this you then not knowing anything is wrong. EGT monitoring is superb and certainly has its place, but it sure isnt a "substitute" for an AFR monitor, more an ideal partner IMO.
True enough, it won´t show detonation instantly. But moderate to severe detonation I can easily hear, and the dangerous slight det. I hope will show up on my EGT meter before getting critical.
Obviously detonation must be avoided in any case. But that danger goes with an AFR meter too i believe. Detonation can occur with correct mixture also, and too high temps can be produced even with the correct mix.
Since I even got a fuel pressure gauge i feel pretty safe.
Pic with boost on the left, EGT in the middle and fuelpressure gauge to the right. All three with built in adjustable alarms :
where has the egt gauge come from if you dont mind me askin
cheers jay