The big problem for these conversions is compression ratio. Propane needs a lot higher ratio to work properly. If you installed pistons that gave about 11 to 1 ratio that would solve some of it but there'd be no going back to gasoline. You'd still have the spare fuel portability issue and the cold weather thing. Rob mentioned minus 35 temps causing problems but at minus 40 propane simply won't vaporize. I worked on a seismograph crew in Alberta in the early 1970s and when it got lower than about 20 below F we'd light the tiger torch and direct the flickering flame at the 100 pound bottle for 15 or 20 minutes before the liquid would vaporize enough to make the torch burn properly. That made some of the crew get a little nervous but "ya gotta do what ya gotta do!" I remember filling those bottles for $3 but then crude oil was $1.86 a barrel too. Talk about the good old days!
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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