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Interesting engines design consepts ~ Oval pistons
I've been doing some reading on street bikes, and ran across this OLD engine from Honda...
http://img.photobucket.com/albums/v5...ng/nr045vn.jpg That is an engineer that likes valves..... More pics.. http://img.photobucket.com/albums/v5...ing/ML1517.jpg http://img.photobucket.com/albums/v5...nrheadsoff.jpg http://img.photobucket.com/albums/v5...50_pistons.jpg http://img.photobucket.com/albums/v5...Racing/128.jpg http://img.photobucket.com/albums/v5...95-vfr750f.jpg Some interesting facts about the engine/bike... In 1992 Honda produced around 300 street versions of a 750cc model, the NR (often mistakenly referred to as the NR750), with a 90-degree V angle. Whereas the NR500 had used an oval piston with straight sides, the road going NR750 used an elliptical piston with curved long sides. The bike became the most expensive production bike at the time when it was selling for $50,000 and with the rarity, nowadays they rarely change hands. The final 500cc race version was capable of developing approximately 130 bhp at over 20,000rpm. |
looks cool, but how many shops are capable of machining an ellipse, especially one through a block? I'm sure a major company could afford it, but small shops...nah.
I wonder what benefits you would get out of oval pistons. |
Originally Posted by larsy87
(Post 4320933)
I wonder what benefits you would get out of oval pistons.
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That's wild! 8 spark plugs and the pistons are separated at the top of the cylinder to what appeared like 16 dif sets of valves. i bet R&D was interesting on that. just too expensive for mainstream you think? 130bhp out of a 500 is damn impressive, i wonder why they dropped that program.
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20,000 rpm
:eek2: |
why not oval shaped/elongated valves... seems like they'd be more efficient in moving the charge to and from the cylinder
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Originally Posted by silver-mod-o
(Post 4320981)
why not oval shaped/elongated valves... seems like they'd be more efficient in moving the charge to and from the cylinder
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Originally Posted by wastedrubber
(Post 4320966)
i wonder why they dropped that program.
I wonder if Wiseco offers pistions and rings for these... lol
Originally Posted by silver-mod-o
(Post 4320981)
why not oval shaped/elongated valves... seems like they'd be more efficient in moving the charge to and from the cylinder
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You sure would have to use some flexible rings to let them walk around those pistons.
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I remember that bike, was covered by all the mags many years ago; good to see it again!
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