Max power is when every molocule of oxygen gas a gasoline molocule attached to it. To make this happen there needs to be surplus fuel (rich). Some of the surplus fuel goes up the stack or into the crankcase unburned or partly burned. Engine makes max power. Exhaust contains high % of carbon monoxide. HP per gallon per hour drops. Black soot can be seen and coats engine components. Engine combustion chamber temps drop some as the rich mixture burns cooler and the raw unused fuel absorbs some heat. Less prone to detonation.
Max economy is when every molocule of fuel has an oxygen molocule attached. To make this happen there has to be a surplus of oxygen molocules(lean). Less carbon monoxide up the stack. Less crankcase oil dillution with raw gasoline. Engine bore/ring life is longer. Exhaust valve life can be shorter due to higher operating temps. Engine can be more prone to detonation/knock/ping. Engine will have best HP per gallon per hour rating. Peak HP will be a few % less than at max rich. Extra cost of wasted fuel making the rich mixture and max power doesn't pay. Unless tractor pulling and that extra 1-5HP is needed.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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