Posted by pete 23 on February 14, 2010 at 10:29:25 from (173.87.0.197):
In Reply to: m head swap posted by lee. s on February 13, 2010 at 20:42:41:
A 400 gasoline head will give you a considerably higher compression ratio than you have with a kerosene head. Should gain a few ponies. I think I would try both carburetors to see which one gives you the best performance. As the 400 used a 25 degree spark advance at full throttle, you may need to adjust your M ignition. Most M's used 40 degree with battery ign and 35 with magneto. Bore size will also affect comp ratio. I would only resurface head if it is needed for flat true surface
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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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