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Location:
Vancouver
Registered:
June 2004
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Re: Possible stupid question regarding valves.
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Fri, 08 October 2004 17:41
 
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the NR750 was made to compete in european superbike races during the era of the 500GP 2-strokes. I think I made that pretty unclear, so this is what I menat - the NS500 2-stroke raced the "500GP" class, and the NR750 was supposed to take over for the RC30/VFR750 in "superbike"; different classes...
The 750 engines run a maximized balance of internal geometry that has rpms up to the best compromise of what can be achieved between bore vs. stroke vs. rpm vs. flame front travel of the fuels. Then only way to get a significant power advantage was to run higher rpms, and the only way to do that without having a smaller diameter cylinder was to run more cylinders. Because they were limited to 4 cylinders, they decided to make a V-8ish motor that had the geometry reminiscent of a V-8, but had the cylinder pairs linked to skirt the "4 cylinders" rule. What ended up happening was a production run of 500 bikes (called the NR750), necessary to homologate the bikes under competition rules to allow them to run them in the race series. Once the competitors caught news of this, and the almost assured domination, they protested, and the sanctioning body agreed that it would kill the class, so they amended the rules to describe "4 ROUND cylinders", leaving Honda with 500 VERY expensive motorcycles that collectors all snapped up in a heartbeat. Incidentally, the NR750 has a redline of something higher than the other companies could ever match, so Honda put a rev limiter in the bikes so the collectors who did ride them wouldn't blo them up (apparently the 750 is alright even up to about 17000rpm)
Incidentally, Honda used to make a bike with a 250cc V-8 that I seem to remember reading that Mike Hailwood rode in the '71 or '72 season
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| | Subject | Poster | Date |
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Possible stupid question regarding valves.
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matt_84 | Thu, 07 October 2004 14:17 |
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Re: Possible stupid question regarding valves.
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Jayem | Thu, 07 October 2004 14:22 |
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Re: Possible stupid question regarding valves.
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ViPeR_NiPPleX | Thu, 07 October 2004 14:23 |
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Re: Possible stupid question regarding valves.
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oldcorollas | Thu, 07 October 2004 14:27 |
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Re: Possible stupid question regarding valves.
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ViPeR_NiPPleX | Fri, 08 October 2004 02:18 |
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Re: Possible stupid question regarding valves.
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dingaling | Fri, 08 October 2004 02:28 |
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Re: Possible stupid question regarding valves.
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oldcorollas | Fri, 08 October 2004 03:11 |
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Re: Possible stupid question regarding valves.
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Henn | Thu, 07 October 2004 14:33 |
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Re: Possible stupid question regarding valves.
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gianttomato | Thu, 07 October 2004 15:58 |
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Re: Possible stupid question regarding valves.
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Ben Wilson | Fri, 08 October 2004 03:24 |
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Re: Possible stupid question regarding valves.
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Henn | Fri, 08 October 2004 03:59 |
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Re: Possible stupid question regarding valves.
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spirokeet | Fri, 08 October 2004 05:10 |
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Re: Possible stupid question regarding valves.
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river | Fri, 08 October 2004 12:13 |
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Re: Possible stupid question regarding valves.
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mrshin | Fri, 08 October 2004 13:03 |
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Re: Possible stupid question regarding valves.
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spirokeet | Fri, 08 October 2004 15:37 |
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Re: Possible stupid question regarding valves.
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510rob | Fri, 08 October 2004 17:41 |
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Re: Possible stupid question regarding valves.
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Jayem | Fri, 08 October 2004 22:10 |
