An overhead valve engine will produce more power and efficiency than a flat head engine. I replaced the flathead engine on my garden tractor with a over head valve engine and was shocked at the difference in economy. It uses about a third less gas to mow the same lawn! The smaller area of the combustion chamber walls is one reason. Any fuel molecules that touch the walls, either burn at much slower rate or maybe not at all. That's why engines with precombustion chambers haven't worked out. I had a Mazda diesel with precombustion chambers. It would never deliver the fuel mileage that it should have. Even the older large truck engines won't deliver the mileage that direct injection engines will.
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Today's Featured Article - Oliver 4340 Plow Setup - by ShepFL. How to properly setup your Oliver 4340 plow plus many tips and pointers that may apply to many other brands of plows as well.
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