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One thing I have considered using propane in a gasoline engine for is a fuel trim adjustment.
How it would work is set the carb on the leaner side, use engine vacuum and throttle position to automatically detect the proper conditions for enrichment, maybe I could even find a wide band O2 meter with an output that energizes when certain air fuel ratios are met as a control.
Use a needle valve or possibly a hvac stepper valve to meter propane into the carb.
This would also aid in cold starting a carb with a good lean tune since they tend to run really bad at first.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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