[Frank Lee]

I haven't really played with adding diesel to a gasser, except for a few rare occasions of putting in a dab for "top end lube".

I have the impression from reading things like Smokey Yunick's work that anything oily in the combustion chamber promotes detonation. I have nothing to go on except the knowledge that diesel is oily, but I wonder if too high a diesel content in a diesel/gas blend would leave oily deposits behind? My thinking is the gassers don't have that nice super high compression and that nice super atomized in-cylinder injector, so the diesel might not combust as completely.

Were I to try it, I think I'd be watching the exhaust pipe, and periodically pulling spark plugs to see if things are getting dirty. Then I'd back off on the diesel or stop.

Which brings me to another guess; lawnmower engines- at least the old side-valve stuff I'm familiar with- have much lower compression than autos so I don't know how much knowledge would transfer over.

By all means play with it, though! There may be a benefit. Who knows, I haven't researched it at all.