- Aug 25, 2009
Well, I don't think SG raced a V4RR with a Norton engine.The V4 Was an Aprilia clone he built (poorly) just to go racing, and boost his ego
The IoM racer was just an Aprilia RSV4 motor in a Spondon frame.
Clearly, SG favored the Aprilia V4 concept.
I wouldn't call the V4RR engine an Aprilia clone though.
It differed substantially from the Aprilia, and was a joint Norton(Skinner)/Ricardo effort.
Aprilia - 65 degree V4, Norton 72 degree V4.
Crank, clutch, gearbox, and cam drive was also different from the Aprilia.
Whether the Norton V4 was a good design or not, it certainly did not benefit from the type of R & D that other manufacturers heap on their designs before production.