Four-engined kart

#1
Does anyone know who built this amazing kart? It looks like the engines may be CV joint coupled together by their cranks, with drive to the wheels from the rear most engine. I wonder if the fuel tank is pressurized. They look like Mac engines to me. Something like 1-2-4-3 firing order, or do they all pop at the same time? It looks kind of like if could be started with a motor/rubber cone pushed into the aluminum piece on the crankshaft of the leading engine, like RC airplanes.

Four engine kart.jpg
 
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