Oval Piston Motorcycle Engine

But lurking amongst these rows of down-to-earth and often stripped-down motors sits a far more exotic beast. 1979 to 1992 Honda NR Oval Piston motorcycle history.

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The oval piston engine had had its day on the racetrack.

Oval piston motorcycle engine. It combined Hondas most advanced technology with the wide use of exotic materials. What it came up with was the NR500 a machine with a number of innovations not least of which was a remarkable engine equipped with oval pistons. The gearbox is a six-speed one served by a hydraulic multi-plate wet clutch system.

The engine was a V4 which was unremarkable but it had eight con rods eight spark plugs and 32 valves as we might expect in a four-stroke engine with twice the number of cylinders. Hondas concept of an oval-pistoned engine or more correctly a borepiston with straight sides and semicircular ends began with the development of the 1979 NR500 GP machine. On its release in 1992 the Honda NR750 aka the RC40 cost 50K was limited to a run of just 200 motorcycles and was the only chance the motorcycling public got to own a bike using Hondas oval piston engine which they had been developing since the 1970s.

This was followed during the 1980s by a 750cc endurance racer version known as the NR750. Honda wanted a V8 - needed a V8 - to compete with the 2 strokes. The biggest reason Honda pursued oval pistons was to increase 4-stroke engine speeds to compete with 2-stroke engines without exceeding 4 cylinders.

Honda The incredible complexity of the design meant that the engine took longer than expected to reach its potential and even when it lived up to Hondas power goals the bike wasnt a particularly winning machine. The Honda Akademie in Erlensee not far from Frankfurt is full of Honda engines car motorcycle outboard and power equipment used for practical technical training. In 1992 Honda produced around 300 street versions of a 750cc model the NR with a 90-degree V angle.

The oval piston concept allowed for eight valves per cylinder which generated more power due to the increased airfuel mixture and throughout compression. The oval pistons later found their way in the 1980 NR750 endurance racer and the road going NR. In 1979 Honda produced the worlds first engine which featured oval pistons with the introduction of the NR500 Grand Prix racer.

Even star designer Massimo Tamburini was inspired by the underseat exhaust system of the NR 750 for the style icon Ducati 916 presented two years after the NR. Honda NR750 Pushing Boundaries With The Oval Piston Engine. The Honda NR was a V-four motorcycle series started by Honda in 1979 with the 500cc NR500 Grand Prix racer that used oval pistons.

The oval piston in the motorcycle GP world was Hondas last 4-cycle stand in the 500cc GPs. It all started with Hondas re-entry into GP racing but they wanted to use a 4 stroke motor. The power output of the 90 degrees V4 oval piston DOHC engine was estimated at 125hp delivered at an incredible 14000 RPM helping the bike to reach a top speed of 160 mph.

Irimajiri who had earlier created the 1966 RC166 250cc GP racer and the 1978 CBX1000 production six-cylinder. According to Fukuis calculation the engine. When I look back at it Im not sure if we were experimenting with cutting-edge technologies or obsessed with foolish ideas recalled Toshimitsu Yoshimura an engineer involved in the development of the NR500s oval piston engine.

The adoption of an elliptical piston and cylinder achieved a compact layout of eight valves which consists. A Honda Oval Piston engine sectioned for display. With eight valves lined up atop the pistons each supported by two connecting rods the teams new 4-cylinder engine looked like an 8-cylinder.

The idea of a V4 with oval pistons was conceived by the brilliant engineer S. The oval pistons connect to the crankshaft by eight connecting rods and the cylinder head holds eight valves per cylinder. January 9 2020.

The FIM had introduced a limit to the number of cylinders which for the 500cc GPs was 4. Oval pistons eight valves per cylinder and over a decade of development time. Honda NR500 Oval Pistons in the Engine Assembly Photo Credit.

Irimajiri returned to the idea in 1990 with the NR750the ultimate V4. The oval piston engine 0X engine developed in 1979 was a product of Hondas drive to conquer technical challenges. Honda developed a 750cm 3 V-4 engine adopting an elliptical piston and began selling the NR motorcycle with the engine installed in 1992.

But they werent allowed. As a side benefit although friction losses from piston rings and valve train were comparable to a V8 crank shaft losses were closer to. The 2 strokes had all but taken over by the late 70s and early 80s.

Ovality is necessary for the piston to move up and down in the cylinder bore as the crankshaft and connecting rod try to force the piston upward and combustion forces the piston downward ovality allows the piston to move without binding in the round cylinder bore. The horsepower per-liter-ratio is similar to the current CBR1000RR.

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