Quote:
Originally Posted by t vago
Less fuel being injected may mean less available energy, but in the case of lean burn, it also means a larger percentage of that energy being used to do useful work.
You also have to figure out what your volumetric efficiency (VE) is at 1500 and 1700 RPMs. This is important, because lower RPMs doe not automagically mean better VE.
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The first part, correct, slower flame front.
Generally VE goes up with RPM, I think the only engines that would high VE under 2000 rpm would be some diesels and tractors etc.
Its actually surprising that so far, no one has been able to answer conclusively the question of how 'lean burn actually saves fuel?'........
I can very easily hook up an accurate RPM meter to the vehicle and prove whether or not RPM goes Up, Down or same at cruise with 'Lean burn' compared to stoich but at a cost of $50 (same cost as a tank of petrol) I think I'll pass till I am tempted to do otherwise.
