Posted by Owen Aaland on February 02, 2015 at 16:08:18 from (216.47.34.37):
In Reply to: Propane instead of ether posted by Phillip Tibbetts on February 02, 2015 at 11:20:35:
Propane has a fairly narrow range of flammability. Somewhere from just over 2% to about 10%. If the air/propane mix is not in that range it will not ignite. ether has a much wider range, somewhere from about 2% to about 40% or even higher depending on the composition of the ether. (Note: One of the properties that makes acetylene so dangerous is that its flammable limits are from about 2% to 100%.)
It is very easy to get too much propane into the engine which will cause the engine to be "flooded". This happens easily when the temperature is near the boiling point of propane, about -42°F. It takes heat to convert propane from liquid to vapor. If there is not enough heat in the convertor to vaporize the propane as it moves through some of the propane goes through as liquid and then boils off in the mixer or manifold cause the mixture to be too rich to ignite.
As far as getting propane to ignite in a diesel engine it takes about 850°F to ignite propane. Diesel fuel is about 500°F.
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