Dad rebuilt his M back in 78 or 79 or so. Its had some hard hours put on it since and hasnt been touched since. The gauge always pegged out at full throttle, at idle it would go a little above half way. We always wrote it off to a bad gauge, but ran it anyways. After he died and I restored it, I put a pressure gauge on it to check the oil pressure to see if I needed to do any engine work. Wide open, it was 70 +-, at idle 55 +-. Put a new oil gauge on it and it still pegs the gauge to this day.
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Today's Featured Article - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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