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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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