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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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