Re: Propane vs Gas Engine Differences ?

Posted by Jon Hagen on December 07, 2005 at 15:40:41 from (69.26.17.113):

In Reply to: Re: Propane vs Gas Engine Differences ? posted by colekicker on December 07, 2005 at 10:18:01:

A propane powered tractor will usually have higher compression to take advantage of the high octane fuel. Propane has no lead to lubricate the valves,so usually valves and seats were hardned. Propane goes into the engine as a vapor, so there is no need for any intake manifold heat. Cold air is dense air,so a heated intake manifold on a propane engine will actually hurt performance. Also a propane engine will usually have more initial ignition timing and may have a quicker advance curve. Most propane engines had the plugs gapped at a tight .015 because plug fouling was less of a problem and the shorter gap helped the spark jump the gap against the higher compresion/cylinder pressure of a propane engine. Some also ran a colder heat range plug because of less chance of fouling with propane fuel.

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