From the physics point of view the cleanest internal shape of a combustion chamber (at low speeds like these engines operate) will provide the least surface to volume. (a sphere is the least) This limits the cold metal from contact with combustible fuel. Cold (comparatively) metal quenches flame travel and costs efficiency. I would go with the single raised dome as it has the least surface area. This assumes they both have the same volume above the block (compression increase) Modern regular gasoline is able to handle 7.5:1 ratios in slow engines (and much more in high reving engines) Jim
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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