Lower exhaust gas temperatures can be a result from a more effecient engine, however the act of lowering exhaust gas temperatures will not necessarily make a more effecient engine.Quote:
am I correct in thinking that an internal combustion engine will be most efficient when exhaust gas temperature is lower
As a mixture is leaned, power and EGT increase up to a point and then decrease.
Max power is approx 50C below and richer than peak EGT
Max economy is approx 25C below and leaner than peak EGT
So low exhaust temps can also be created by a less effecient rich mixture
Lean mixtures and high power settings lead to detonation
Advancing the timing and high octane fuels will conteract detonation
