Maintenance & Technical > KX500 Original
Foam cuts down vibration?
USMC 500:
There is this foam in a can that once sprayed it expands and hardens. Electricians use it to fill holes in studs that they have run wiring through in construction projects. I hope everyone knows what I'm talking about :roll:. Anyways, (in an old timers acent) "back in my good ol' day of racin'" :-D I used to spray this foam into the frame of my KX500 and try to completely fill the frame. Once it dryed and hardened I would cut the excess off where ever it came out and retap all bolt holes in the frame. This action would cut down on the notorious 500cc 2-stroke vibration by a HUGE margine. I would also install street bike bar end weights which would also cut down vibration at the handle bar. I dont really understand the physics of this all but it worked great and it would cut down the rider fatiuge factor. Has anyone heard of these methods or tried them? Or am I just a nutcase that has landed on his head a few times too many? :lol:
Dutch-K5 Fan:
You can buy inserts for the handelbars to reduce vibration.
I believ that because of the weight the bars can't(or at least a lot less) vibrate.
Construction foam( Purschuim in dutch):
Like on a guitar the frame is a resonance-box. With the foam you block the air to
to move and vibrate. And so elimenate resonance of the frame.
Sounds good to do.
Dutch
bigbellybob:
i wonder how it would effect frame rigidity. i know mx frames are designed to have a little flex. now is this flex good or bad for handling? uni-body race cars fill the uni-frame like rails with some kind of expanding foam to stiffen the body witch helps the handling of the car. if a stiffer frame on a mx bike is better for handling, i would think the foam would also help the handling of the bike.
Dutch-K5 Fan:
I think that the olderbike were rigid and benafit from les flex.
Remenber the first alu honda's and is 20 inch wheels. They were to rigid
and in mx bikes you need some i gues.
Sould construction foam be so strong that it makes the frame stronger.
Maybe in those race cars they use a stronger type of foam.
Don't know were you get the info from, but maybe you could find that out??
Dutch
bigbellybob:
a link to look at i first seen it on a speed channel show. and yes the do use a application specific foam
scroll down to Foam-Filling the Chassis
http://www.sportcompactcarweb.com/projectcars/0006scc_project_nissan_300zx_part_5/index.html
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