Re: Dumb question of the day

Posted by KEB on December 05, 2006 at 15:50:11 from (192.31.106.35):

In Reply to: Dumb question of the day posted by Mike CA on December 05, 2006 at 08:24:12:

Mike, ignore the knucklehead comments below.

In a flat head engine, the valves are in the block beside the cylinder, instead of in the cylinder head above the piston. The combustion chamber is kind of oblong shaped to cover the top of the individual cylinder and extend out over the top of the associated valves. From the outside, the top of the cylinder head is more or less flat, with the spark plugs sticking directly out the top. In a flathead engine, the manifolds are mounted to the block, in an overhead valve engine the manifolds are mounted to the cylinder head, since that"s where the valves are located.

In the flathead engines I"ve seen, the valve lifters ride directly on the camshaft & push directly on the bottom of the valve stems. No pushrods, rocker arms, etc.

Most automative engines were flatheads up until the 50"s & early 60"s. I"m assuming it was because they were cheaper to produce, as they certainly didn"t have any performance advantage over a overhead valve engine.

Kind of suprised me that tractors from the 1920"s had overhead valve engines when most of the autos were using flatheads.

Keith

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