For decades Honda saw itself as motorcycling’s technology leader, The NR750 defined, in the metal exactly what that meant to the company. The entire concept of the NR goes back to the time between 1979 and 1981 and the NR500 Grand Prix racebike. That bike was a 499.5cc V4 four stroke with oval pistons that allowed eight valves per cylinder and eight total spark plugs. Its complexity and innovation ended up being its undoing. The monocoque chassis, 16-inch wheels and the difficulty of matching the era’s potent two strokes drove Honda to abandon the concept after two unsuccessful years of trial and error. The 748cc liquid cooled 90 degree V4 engine was of course the showstopper, At the time Honda had around 200 patents on it. The reasons Honda had gone down this rabbit hole in the first place were cylinder head flow and combustion efficiency, the elliptical pistons essentially gave the NR the combustion chamber volume of a V8, allowing eight valves per cylinder to be tightly packed into the chamber. But making the pistons oval meant they were 30 percent smaller than a pair of pistons taking up the same space, This according to Honda’s original NR brochure, resulted in a major reduction in sleeve related friction. This quasi V8 required a lot of doubling down on components, twin connecting rods made of titanium, two spark plugs, eight valves and two EFI throttle bodies per cylinder. Getting rid of the gases was, of course a complex labyrinth of an exhaust system in an 8 into 4 into 2 into 1 into 2 configuration.
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