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model code of RC40. One of the most expensive road motorcycles yet offered for sale, a limited number of the NR models (300 examples) were sold in 1992 with a 750 cc version of the engine, capable of developing approximately 130 PS (96 kW; 128 bhp) at 14,000 rpm in standard form. The
Japanese market motorcycles were restricted by law to 77 PS (57 kW; 76 bhp) at 11,500 rpm. Although a heavy machine by modern standards, it incorporated a range of technologies and design features that have now appeared on more common models.
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innovative solution of constructing a 'V8' engine in the form of a four-cylinder. This was achieved by designing an oval piston that allowed a total of 8 valves per cylinder, and connecting two con-rods to each piston. Such a configuration led to almost unprecedented complexity in terms of engine design, with 32 valves and eight con-rods incorporated into the dimensions of a regular four-cylinder motorcycle engine.
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Development and testing of the new engine proved fraught with difficulty (prompting some motorcycle journalists of the time to comment that NR meant "Never Ready") but Honda eventually succeeded in meeting the original performance criteria for the engine. The final 500 cc race version was capable of
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which generated more power due to the increased air/fuel mixture and throughout compression. In 1992 Honda produced around 300 street versions of a 750 cc model, the NR (often referred to as the NR750), with a 90-degree V angle. Whereas the NR500 had used an oval piston with straight sides, the
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The oval piston concept continued in the NR750 endurance bike, which made a brief appearance during the 1980s. Finally the technology was transferred to the road, at least on a limited basis, with the bike simply referred to as the Honda NR. This is usually distinguished by using Honda's internal
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To achieve this aim Honda could have looked to follow their 1960s practice of increasing the number of cylinders to produce more power. However, Grand Prix rules at the time required a configuration with maximum of four combustion chambers. Honda engineers therefore came up with the highly
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developing approximately 130 bhp at over 20,000 rpm. However, this rarely translated into success on the track for the NR500, and Honda subsequently redirected its Grand Prix campaign in the form of the
340:[The Honda NR750, which caused a stir along with the NSX, sold for about 10.8 million yen! Why was it so cheap considering that the total number of units produced was only 322?].
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in the late 1970s following an absence since their highly successful participation in the 1960s. During the absence of Honda, Grand Prix racing came to be dominated by
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equivalent. Honda had long preferred to concentrate on four-stroke development and therefore decided to produce such a machine to challenge their
Japanese rivals.
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road going NR750 used an elliptical piston with curved long sides. The bike became the most expensive production bike at the time, selling for $ 50,000.
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In 1983/84, a 250 cc V-twin using a supercharger and the 8-valve oval piston technology was developed but never seen in public.
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101.2 mm / 50.6 mm × 42 mm (4.0 in / 2.0 in × 1.7 in)
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racer which used oval pistons. This was followed during the 1980s by a 750cc endurance racer version known as the
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oval-piston, DOHC , 8 Valve per cylinder
Individual gear driven cam banks per cylinder.
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The origins of the 'NR' series of motorcycles lie in Honda's return to
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338:"「NSX」とともに世間をザワつかせたホンダ「NR750」が約1080万円で落札！ 総生産台数はが322台の割に格安だった理由とは"
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machines that could easily attain a higher specific output than a
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344:(in Japanese). Kotsu Times Sha Co., Ltd. Archived from
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17 L (3.7 imp gal; 4.5 US gal)
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From
Fantasy to Reality: Completion of the 0X Engine
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361:"Honda V4 motorcycle concept with trick engine"
109:66 N⋅m (49 lbf⋅ft) @ 11,000 rpm
99:115.8 hp (86.4 kW) @ 14,500 rpm
315:"From the NR to Le Mans and Production Bikes"
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49:747.7 cc (45.63 cu in)
321:. Honda Motor Co., Ltd. Archived from
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173:244 kg (538 lb) (
167:223 kg (492 lb) (
89:159.8 mph (257.2 km/h)
150:: 1,090 mm (42.9 in)
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140:: 2,150 mm (84.6 in)
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394:The Oval Piston Engine (1979)
367:. Edmunds.com. Archived from
336:Kondo, Akifumi (2024-06-07).
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240:Grand Prix motorcycle racing
145:: 700 mm (27.6 in)
129:1,435 mm (56.5 in)
359:Holland, Bob (2008-10-08).
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221:concept allowed for eight
159:785 mm (30.9 in)
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319:Honda History: Challenge
295:Cologne Motorcycle Show
206:in 1979 with the 500cc
419:Grand Prix motorcycles
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270:two-stroke machine.
195:(New Racing) was a
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202:series started by
16:Type of motorcycle
414:Honda motorcycles
388:model information
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77:Compression ratio
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386:Honda NR750 RC40
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380:External links
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371:on 2008-10-10.
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348:on 2024-06-09.
342:Auto Messe Web
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325:on 2006-08-13.
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369:the original
365:Straightline
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346:the original
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323:the original
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280:Oval pistons
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217:. The oval
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115:Transmission
34:Manufacturer
248:four-stroke
234:Development
156:Seat height
408:Categories
301:References
244:two-stroke
211:Grand Prix
200:motorcycle
134:Dimensions
261:Rear view
125:Wheelbase
86:Top speed
293:In 2008
227:cylinder
193:Honda NR
51:4-stroke
20:Honda NR
289:Concept
119:6 Speed
223:valves
219:piston
197:V-four
164:Weight
105:Torque
81:11.7:1
67:stroke
45:Engine
268:NS500
215:NR750
208:NR500
204:Honda
95:Power
38:Honda
225:per
191:The
63:Bore
53:90°
175:wet
169:dry
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65:/
55:V4
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148:H
143:W
138:L
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