There is a new player now in car engines davis diesel has converted the ST28 to diesel. it is on you tube at diesel st-1. the advantages are they run cooler, very good fuel econony
fast response, lots of torque and more power output, a 28 diesel conversion is equilvant to to at least a 35 glow maybe 40. I do believe this is past the RandD stage. appears to be less hassel , no glow plugs . it is of course 2stroke the VP 21 4 strk may be uo to a 25 now Mecoa, but not a barn burner ditto for OS, I am not getting into the 2stk.vs. 4stk debate
The one thing they have in common of course is fuel economy martin


\One big advantage of the diesel is since they run cooler less issues with this

I missed Gregs post on this so looks Like he has done it. intresting enough he just converted a Mag52 4 strk to diesel for me but it is slated for aircraft use, my knowledge of RC cars is limited had a traaxax 12 years ago, but I am getting the ST truck with the diesel from Davis to mess with