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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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