The NR 750 (New Road) is a model of sport bike, designed and marketed by the company Nippon Honda.
The competition, since the beginning of the bike, was the way for manufacturers to display their technological expertise and showcase their innovations. If some of the techniques used in competition are found on road machines, very few models of competition have been reworked to be counterparts. Ducati has been on the market in 2006, extrapolated MotoGP machine, the Desmocedici RR. But this is not the first attempt. 15 years ago, Honda has also marketed a machine incorporating many technologies used in Grand Prix, on his NR 500 since 1979, then Endurance on NR 750 in 1987.
The oval piston engine of the NR 500
The most dramatic and best known of these technologies is probably the oval piston engine.
For more power, increase the filling of cylinders. The simplest is to increase the number of valves. But this technique quickly shows its limits and it must play on the diameter of the valve and privilege either the admission or exhaust if you go beyond four or five valves [1].
The solution chosen by Honda to create oval cylinders, to place eight valves. It must nevertheless 2 candles to ignite properly each combustion chamber. Each operates two piston rods.
The engine is composed of four of the cylinders in V, open to 90 degrees. The bolt must withstand 32 valves and 8 candles. It gets 130 horsepower at 14 500 rpm and a limited diet for the sake of reliability at 15 000 rpm, but could give more.
This engine is obviously fueled by electronic injection PGM-F1 with two injectors per cylinder.
NR 750 of the road is presented at the Geneva show in 1991.
The fairing is entirely carbon fiber. It has been widely studied in wind tunnel to give the best airfoil. The numerous fins, gills cooling and other aerodynamic appendages give it a futuristic look. The exhaust goes under the saddle and let the view of the swingarm. This single-sided swingarm is a direct result of studies in partnership with ELF.
We find the general shape of the NR 750 of the VFR RC 36 II.
Téléhydraulique inverted fork with 43 mm diameter is fully adjustable.
To gain a little weight, the wheels of 16 inch front and 17 inches at the rear of magnesium. The machine still weighs over 220 kg dry.
As in the cockpits of fighter jets, bubble receives a surface treatment to titanium. The dashboard offers the driver a lot of information: a fuel gauge, temperature and oil pressure, water temperature, a digital speedometer, a tachometer …
This bike has also been the subject of more than 200 patent applications.
Of the 322 copies produced at a rate of 3 copies per day, only 34 were available in France. However, each buyer can pay the requested 375 000 F (about 57 168 €), Honda offered a keychain silver.
Incidentally, a version inflated to 155 horsepower and reduced to 180 kg beaten successively records kilometer rolling start at 299.825 km / h, the mile flying start at 299.788 km / h, the mile with standing start 221.219 km / h and 10 kilometers standing start at 283.851 kilometers per hour It was driven by Loris Capirossi on the ring Nardò.
This machine has appeared in several episodes of the television series Commissaire Moulin, the actor taking the lead role, Yves Renier being possessor of one of these machines.
Legend has it that production has declined to provide the true NR, the bike that appears on the screen is a mere 750 VFR remaquillée.
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