"bob and john" (bobandjohn)
10/07/2016 at 10:45 • Filed to: None
2
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"bob and john" (bobandjohn)
10/07/2016 at 10:45 • Filed to: None | 2
| 10 |
closest you will ever get to a F1 car on the street. They arent THAT expensive either, if you can FIND them.
Now, if you will excuse me, i have an importer to contact :)
DynamicWeight
> bob and john
10/07/2016 at 10:54 |
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That’s nutty. Gotta wonder what that feels like because I’ve always thought of 10k-16k as the place on bikes that ruins you for cars. No car I have ever been in comes close to matching the acceleration of a bike in that zone.
Snuze: Needs another Swede
> bob and john
10/07/2016 at 10:55 |
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This is awesome. I’d love to find an old Honda CBR-250RR which was basically the H’s equivalent to this bike.
And wow, that ZX2R looks sooo much like my old CB-1.
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bob and john
> DynamicWeight
10/07/2016 at 11:06 |
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oh, this bike is slower then my SV650.
it just sounds like god unleashed
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bob and john
> Snuze: Needs another Swede
10/07/2016 at 11:13 |
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look up in canada, there were a few for ~ the 3k mark here recently
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DynamicWeight
> bob and john
10/07/2016 at 11:18 |
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I did not realize it was such tiny displacement. I assumed it was a fancy 600. Oh well.
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bob and john
> DynamicWeight
10/07/2016 at 11:19 |
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nope, just a tiny 250.
I wonder how high it would rev if you replaced all of the rotating gear and mass with lightlight stuff....
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DynamicWeight
> bob and john
10/07/2016 at 11:27 |
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Probably not much faster. As I understand it, these kind of speeds are kind of the max for a piston/cylinder style motor. IIRC valve float starts becoming a pretty serious issue that can’t be solved by traditional springs anymore. A little googling saw mention of a Ducati that made it to 22k during braking with mechanical lifters.
This makes me want to take a moment to say springs are fucking crazy. Perfect example of “easy to learn, impossible to master”. As an engineer it constantly blows my mind how other, trained engineers, will screw up even linear spring calculations.
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Snuze: Needs another Swede
> DynamicWeight
10/07/2016 at 12:01 |
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You are absolutely right. A long time ago piston speed was a huge limiting factor in rpms because the metallurgy just wasn’t there. Now pistons, rods, wrist pins, are all super strong & light weight (relative to the old days) so it’s really not much of a limit anymore. But that’s why people persist with the notion that only big bore/short stroke motors are good for high RPM. There is some truth to the statement, but not for the above reason.
Valvetrain stability and the ability to control valve float is what determines your rev limit, and it’s all in the spring selection, and getting your components as light as possible.
BobintheMtns
> DynamicWeight
10/07/2016 at 12:37 |
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Desmo valves for the win!
sdwarf36
> DynamicWeight
10/07/2016 at 21:25 |
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