https://youtu.be/rZC1Aklig60
In '53 International made a dozer engine that starts on gasoline, then transitions to diesel.
The left side of the engine is all diesel business, filters, ignition pump, injectors, and a decompression switch. All of the cylinders had one valve in the engine block that opened to a dead end expansion chamber, opening these valves would drop the static compression ratio to a gasoline friendly level.
The right side of the engine had an intake manifold, with a very small single barrel carb, and a typical looking distributor. And spark plugs. The carb had no throttle plate, it ran wide open with just enough CFM to make the engine idle. It did have a choke.
With the compression release pulled open the engine would roll over using just a single Group 24 battery. This is a very large engine, and with diesel compression levels would have required several batteries.
It would start up on gasoline until it was warm. Then you would coordinate the decompression lever and diesel throttle to transition to diesel power for actual operation. In gas mode, it didn't produce enough torque to actually drive the dozer.
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