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snippage.....
As stated, propane is a fuel. A fuel which has a much higher flash point than diesel and a higher expansion rate.
Now fuel is injected into an engine at an exact moment. That's what we all know is timing. Inject too early and you have un atomized fuel being compressed and going off at or before top dead center. Resulting in a windowed block. Same goes for too much timing. Now. Why on Gods green earth would you inject a fuel that spikes cylinder pressures to an unsafe level without controlling when the fuel is injected? People do it. Some get lucky and it lasts a little while longer than others. Eventually though it'll bite em.
First post, researching these engines as a possible swap into my yota Xcab 4x4 when this caught my eye. Can't speak to the expansion rate, but the flash point statement is wrong if an SAE publication is to be believed. "Alternative Fuels Guidebook" (R. Bechtold, 1997 SAE; ISBN 0-7680-0052-1) pg. 66 has a listing of Propane and diesel fuel properties side by side. Flash point for diesel is 165*f; flash point for Propane is -156*f