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Dirt Bike Mods & Maintenance
Thinking out loud about forks
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[QUOTE="Jeremy Wilkey, post: 69630, member: 17220"] Ok... Man this kills me... -The factors are Midvalve Float.. This impacts when the midvalve actually starts to work.... (In terms of speed.) -Then the midvalve stiffness or stack build.. These two are directly realted to the swept volume of the clyinder. Volume is related to pie r2 x h.. So a larger cartrige is massively impacting to the total swept volume. So lets look at to cases.. KX 28mm cartridge... Thge midvalve runs no float but does have .1mm bleed/float.. This stack is also only moderatly stiff however, because it pivots of a very small shim.. SO although in terms of speed the midvalve impacts lower speed ranges but the stack is not very progressive and does not impact high speeds as much as might be imagined.. Case 2... YZ fork with much more float... This set-up does not work until a slighlty faster speed, however the volume crossing the valve is much larger so apples to apples it's almost the same thing... The valving is also more progressive as it's stack is built.. A couple of more observations.. The basevalve stacks also vary greatly on these two bikes.. Why..Very simply one is stiffer one is softer. Like the circuts of a carborator the speed ranges overlap. The mid-valve of the KX has a slighly higher overall damping coeifecent and hence requires a slighly lighter valve stack and vise versa. Also the YZ has the CV which is bleeding fluid as well, also nesciating a stiffer build at the basevalve to acheive the ideal overall coifecent. Which works better? It depens on the aplication. I'll give the KX a better stadium build, and the YZ a better outdoor build. The 28mm Midvalve trades plushness for instant damping, and hence more precise handling when riden by an expert. The YZ on the other hand is more suple at very low speeds. However in big hits is often more harsh.. (Volume of mid-valve and a very stiff midvalve just stacked up on you!) Ok a couple of more issues I have talked about forever which no ever seems to remmber.. A KYB fork does not work effeceintly until the fork has compressed several inches.. That is often why pro's preffer the Showa forks.. Which work all the time. This is the problem with backyard tunners.. They really don't understand how the circuits overalap.. I get imesly frustrated when I read this topic.. I feel like I've been beating this drum for literally years and noone ever gets it.... Sorry for the rant.. Also the reason compression feels so much softer is related to a few simple things.. Compression has a much smaller volume going through base-valve. (Only the rod.) If the basevalve restricted flow on return you would have chronic fork isseues such as zero damping.. The midvalve does not impact very low speeds so you don't feel it.. Rebound very stiff active valving, with a large volume.. Ofcourse you will feel it more.. And I ask you do you think you want as much compression as you have rebound? Regards, JEr I know I can't spell and I rant but these are the issues. There are still some small fine points but this is good for now.. ------------------ "Danger is one thing but danger combined with long periods of suffering is quite another." Sir E. Hilary wilkey@mx-tech.com [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Thinking out loud about forks
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