Re: Bob M Haas, M with gas/kerosene/diesel

Posted by Bob M on July 20, 2001 at 17:52:01 from (66.66.72.246):

In Reply to: Bob M Haas, M with gas/kerosene/diesel posted by 230,H,M on July 20, 2001 at 17:17:47:

You are correct - that's what the decompression (starting) lever does. When you pull the lever back it opens an 3rd valve in each cylinder. This opens a passage to an auxiliary (starting) chamber in each cylinder. This reduces the compression ratio from about 14:1 to about 5(?):1, making the motor much easier to crank. Each starting chamber also contains a spark plug. The starting lever also does several other things: It switches a pair of butterfly valves in the manifold so incoming air passes thru the carburetor, releases the carb float so the carb can fill with gas, and closes the circuit to the ignition coil primary. Thus pulling the starting converts a high compression, fuel injected diesel engine into a low compression, spark ignition gasoline engine. Once the motor is started and warmed a minute or two on the gasoline cycle, pushing the lever back in reverses all of the above, and enables the diesel cycle. The motor then runs like any other diesel.

It's a rather complex solution to the problem of starting a diesel engine with a low-powered electric starter. Some other mfr's - Deere and Caterpillar - solved the problem by utilizing a separate 2 or 4 cylinder gas starting (pony) motor to crank up their early diesels.

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