Honda NR (New Racing) is a series of four-engine V Honda in 1979 began with the 500cc NR500 large oval pistons.This Price runner followed in 1980, used a version known drag racing 750cc under the name of NR750. The concept piston oval eight valves per cylinder, which allows more power generated due to the increase of the air / fuel mixture flow and
compression. In 1992, Honda produced around 300 street versions of the model 750, the NR (often mistakenly referred to as the NR750). Contains 90-degree V-angle While NR500 used an oval piston with straight sides, the piston NR750 road elliptical with the sides folded used. The bike has been sold, the bike produces the most expensive at the time was $ 50,000 and the rarity today, it is rare to change hands.
The origins of the series "NR" to return to the MotoGP bikes are Honda in 1970, after a period of absence from his successful participation in 1960. During the absence of the Grand Prix Honda came for two-stroke engines, which could easily reach a higher specific power than an equivalent four-stroke dominated. Honda has long focused on four development time and decided to produce such a machine to challenge their Japanese competitors.To achieve this goal, Honda could look at their 1960 follow the practice of increasing the number of cylinders to produce more energy. However, Grand Prix rules both require a configuration with a maximum of four combustion chambers. Honda engineers came up with the innovative solution for the construction of an engine "V8" in the form of four cylinders. This was supported by an oval ball has allowed a total of eight valves per cylinder, and connecting two reached each stem. This configuration leads to complexity unprecedented in terms of engine design, with valves 32 and eight bars embedded in the dimensions of a four-cylinder engine normal motion.Development and testing of the new engine has proven very difficult (observations have led some 'motion journalists at the time, which means nr "Never Ready"), but Honda has finally managed to meet the performance criteria of the original engine. The 500cc version last race was able to develop about 130 hp at 20,000 rpm. rarely resulted in success on the track for Honda NR500 and then redirected his Grand Prix campaign as NS500 two-stroke.In 1983/84 a 250 cc V-twin engine is designed with a compressor and Technology 8-valve oval piston, but never seen in public.The concept oval piston NR750 motorcycle continued resistance, which has made a brief appearance in 1980. Finally, the technology was transferred to the road, at least to a limited extent, in the wheel "NR". Perhaps one of the more expensive bikes are offered for sale, has a limited number of models NR in 1992 to develop a version of the 750cc engine 125 hp at 14,000 rpm sold as standard. Although a heavy machine by modern standards, has integrated a number of technologies and design features that now appeared on most regular models.
Specifications
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