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Injury
New Member
USA
37 Posts |
 Posted - 07/05/2007 : 08:42:27
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I think it's 6:1 ratio. some interesting info on unsprung weight...
Unsprung weight is weight that is not carried by the suspension of the bike. This includes both wheels, axles, brake calipers, and related parts, the lower fork legs, the oil in the forks, half the weight of the front springs (the top half is sprung weight), and the weight measured at the the rear end of the swing arm. The front of the swing arm is effectively supported by the sprung portion of the bike, as is nearly all of the weight of the rear suspension components of a modern MXer.
Unsprung components are those that must follow the contour of the ground, and thus must be allowed to move independently of the rest of the bike in order to do this. This motion needs to be controlled by the suspension in order to keep the wheels in optimal contact with the ground and give the rider the greatest possible control. The simple problem is that the heavier the unsprung components are, the more difficult it is to control them, making the suspension less efficient.
When a wheel hits a large bump, it has to roll up over it and then back down the other side. Ideally, it should never loose contact with the ground while this happens. If the wheel is heavy, its own intertia resists the bump raising it upwards, putting extra load on the tire and rim. once it gets to the top, a heavy wheel will want to keep going up off the top, and resist the efforts of the suspension trying to push it down along the ground. The same thing happens when the ground drops away from the bike. The suspension needs to be able to move the wheel down into the hole to maintain contact with the ground. Lighter components require less control, so the suspension can be "plusher" without sacrificing control.
Rotating mass contributes more to a resistance to changes in speed (acceleration and braking) and to changes of direction than to suspension operation, but many of the same components are involved.
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1993NC30,03YZ450F |
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grandpanot
Senior Member
USA
1143 Posts |
Posted - 07/05/2007 : 13:45:49
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Rallykay you are right I had not considered the reduction of rotaion mass and its effect on accelleration so there are dual benefits!
Steve, we all need to work on that weight component (it usually is the cheapest). In my case, I weigh 135, and have weighed that since high school, (I am now 50), (except when I got bad food poisoning from Venison and dropped to 126). So for me to loose weight I would have to go on the Colin Edwards diet "I would have to chop one leg off to reach Pedrosa's weight" :) |
Hello, my name is Jeff and I am a Trackaholic.(EVANSTON, Illinois) |
Edited by - grandpanot on 07/05/2007 13:49:58 |
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Lee_
Familiar Member
United Kingdom
351 Posts |
Posted - 07/05/2007 : 19:52:27
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Found some more pictures and info on it here. http://www.rvf400.de/news.htm
Couldn't really pick much up from free translation but it looks like it was based on a HRC item for an RC45 which has been shortened to fit an NC35. Anyone who is good at german can probably clarify this. 
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1998 RVF400 |
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SUNNYDAY
Senior Member
United Kingdom
1014 Posts |
Posted - 07/05/2007 : 20:08:06
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In real terms What difference will this part make to the overall performance of the bike?
SUNNYDAY. |
91' UK NC30 |
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rallykay
Familiar Member
Sweden
253 Posts |
Posted - 07/05/2007 : 21:11:40
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It´s shinier! And lighter.
Alone it probably ain´t worht much but put all the small things together and you have a 10 kg. lighter bike and thats worth something.
And your wallet will be a lot lighter too!!! |
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a_morti
Senior Member
United Kingdom
1344 Posts |
Posted - 07/05/2007 : 23:28:22
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quote:
Der nächste Reinfall, ich habe mir auf den Rat eines Händlers eine nagelneue HRC Kit-Achse von der RC 45 besorgt, der Händler meinte die Achse müßte in die NC 35 passen. *Censored* happens, sie passt nicht, ist zu lang. Jetzt habe ich gleich 2 Probleme, eine schweine teure nagelneue Kit-Achse die nicht paßt und PVM-Magnesiumfelgen bestellt, mit dem Konus für die Zentralmutter. Geht nicht gibt es aber nicht, vielleicht habe ich jemanden in Östereich gefunden der mir die Achse fertigen kann, die Zeichnung ist überarbeitet und auf dem Weg nach Östereich. Falls dies klappt werde ich Euch informieren. Hier könnt Ihr Bilder von der überarbeiteten Zeichnung sehen und von der originalen Kit-Achse. Die Bilder von der Achse habe ich leider nicht selber gemacht, da meine Kamera streikt, sind aus dem Netz, Zeichnung ist von mir angefertigt worden. Reiche noch einige Bilder von mir nach, damit Ihr den Unterschied zwischen den Achsen sehen könnt.
quote:
The next bad luck, on the advice of a dealer I got myself a brand new HRC kit axle for the RC45.The dealer reckoned it would have to fit the nc35. "Sh1t happens" (sic), it doesn't fit, it's too long. now I have two problems at the same time, a bloody expensive brand-new kit axle that doesn't fit and a PVM magnesium rim ordered with a cone for the central thread. No such thing as "won't fit" though, maybe I've found someone in Austria who can make the axle for me, the drawing is drawn and on the way to Austria. I'll let you know if this works. You can see pictures of the revised drawing here and the original kit axle. unfortunately I didn't take the pictures of the axle myself, as my camera is on strike. They're from the web. I did the drawing myself. I'll pop some pictures up so you can see the difference between the two axles.
HTH  |
WWW.HONDACB1.CO.NR
+ NC29 swingarm ('29 wheels soon), Quill T3 Ti, lots of black, blade rear hangers, beet rearsets, brembo brake. Top mods: BT45's, touring screen & rack with 50L box! Stolen recovered, scumbags best not try again. |
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a_morti
Senior Member
United Kingdom
1344 Posts |
Posted - 07/05/2007 : 23:35:19
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| Reading the rest, he got his modified-kit-part made, the magnesium 6 spoke wheel (5,5"x17") appeared, a HRC RC45 disc (internally vented) and kit rear caliper and support, and it all fitted up no troubles. Sounds like an awful lot of money to spend but then this guy sounds some kind of committed. |
WWW.HONDACB1.CO.NR
+ NC29 swingarm ('29 wheels soon), Quill T3 Ti, lots of black, blade rear hangers, beet rearsets, brembo brake. Top mods: BT45's, touring screen & rack with 50L box! Stolen recovered, scumbags best not try again. |
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Andy666
Familiar Member
United Kingdom
331 Posts |
Posted - 07/05/2007 : 23:59:18
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That's mruehl34's website. I'm sure he'll clarify.
Some people have far too much money |
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Injury
New Member
USA
37 Posts |
Posted - 08/05/2007 : 18:37:00
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Grandpanot, if you are interested here is a link to a battery that is suppose to save 3 lbs.
http://ebattonline.com/ |
1993NC30,03YZ450F |
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prauk
Familiar Member
United Kingdom
427 Posts |
Posted - 08/05/2007 : 19:25:32
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RC45 Axle,about £1500 for the full kit for anyone that feels like wasting a few quid |
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mruehl34
Regular Member
Germany
521 Posts |
Posted - 08/05/2007 : 20:51:11
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But the rc45 hrc axle didn´t fit in a rvf400. To long for the rvf400.
I can sing a song about this. Now i have one for my rvf400, specially made for the bike.
The axle is lighter than the oem part, less rotating wheight.
I like my nc35 i don´t want a newer bike, example r6, gsxr k6 or k7 duc 998.
it is nice for me sitting in the garage after the work to built my nc.
And riding my nc.
Look:
Michael |
Edited by - mruehl34 on 08/05/2007 20:52:04 |
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mruehl34
Regular Member
Germany
521 Posts |
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Dave Franciosy
Familiar Member
United Kingdom
345 Posts |
Posted - 08/05/2007 : 21:44:34
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| There was one on ebay the other week went for 80 pounds |
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Polarbear
Familiar Member
United Kingdom
314 Posts |
Posted - 09/05/2007 : 16:41:31
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| sounds and looks nice mate but playin about with titamium parts......hmm, sounds too fidgety and way too expensive for not alot of gain. id do it as a last resort, even after a 444 bore/conversion. |
The Polarbear. Bringing motogp to the open roads:) |
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Bobo_RVF
Settled In Member
Romania
146 Posts |
Posted - 24/05/2007 : 15:53:29
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| @mruehl34 - what fork do you have in the picture above ? i don't think is the standard gold Showa, it look pretty dark and tasty to me :) |
1994 Honda RVF400RR (NC35), Beringer MasterCylinder and Clutch, Galfer brake discs and pads, Yamamoto full twin stack exhaust system, *Company Name Removed* rear seat kit |
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Acid
Senior Member
Ireland
1093 Posts |
Posted - 24/05/2007 : 21:55:04
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| There Rs 250 race forks same as vfr mans i think |
The Ring !!!!!!!!
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vfrman
Moderator
USA
8005 Posts |
Posted - 25/05/2007 : 02:21:48
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| Which I need to find springs for. I am too fat for them! |
91 VFR400R
Hill AFB, Utah
USA |
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grandpanot
Senior Member
USA
1143 Posts |
Posted - 28/05/2007 : 15:42:49
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Steve
How difficult was the RS250 for conversion? What year forks did you get and I assume you got the yoke as well right? I am assuming it would be a little more complex for the NC30 as the 35 already has USD forks.
BTW I sent my stock rear axle off to the machinst to get that done in TI as well. |
Hello, my name is Jeff and I am a Trackaholic.(EVANSTON, Illinois) |
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mruehl34
Regular Member
Germany
521 Posts |
Posted - 28/05/2007 : 19:18:43
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You can fit a RS250R fork from 1993-2004.
Michael |
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vfrman
Moderator
USA
8005 Posts |
Posted - 29/05/2007 : 17:04:36
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| I lost a lot of steering when I put mine on. Now I am trying to get some custom yokes machined up. |
91 VFR400R
Hill AFB, Utah
USA |
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