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shim shuffle - KTM WP forks
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[QUOTE="James Dean, post: 24427, member: 18501"] Michael, Your points are well made when searching for a perfect solution. My comments were made hoping for good discussions. ***Keep in mind those WP forks have 14mm cartridge rods. They push more fluid through the valve and are more sensitive to pressure than a 12mm rod. (36% more fluid compounded with 36% more area on the rod) -Low speed clickers work in parallel with the LS shims. They overlap within a range. There is a point where I would aggree with your arguement and for me it is more like 1/5 rather than 1/3. This may just be 5 clicks vs. 8 clicks to increase LS-comp and help reduce bottoming. Not an ideal answer though. -The crossover expansion should be looked at with the 14mm rod in mind. An expanded crossover gap from .15 to .20 will not be nearly as noticeable as on a 12mm rod fork. Also, the effect of reduced stiffness on the HS stack will match the damping of an increased crossover gap WITHOUT reducing the HS stack stiffness at some "uncertain" velocity. My point is to look at tension vs. deflection instead of stiffness alone. The 2 stackings will have similar damping, although to be precise you are correct that it's not exactly the same. That said, here's my suggestion- 24 x 0.1 2x 15 x 0.1 (a little more support for the 24's) 12 x 0.1 (total gap now = .2) 22 x 0.1 18 x 0.1 (remove the 20 x 0.1) 16 x 0.1 14 x 0.1 12 x 0.1 (this just looks better on paper [img]http://dirtrider.net/ubb2/wink.gif[/img] ) 10 x 0.3 If I were a KTM engineer for a day, the SX would use the current compression valve and the EXC/MXC would get a valve with 40% greater port area. They should have different valves for their intended uses IMHO. Square ledges are HS damping at 20mph just as much as rounded are at 50mph. Gut feeling is this design is never going to be as plush as the Marzocci's of years past. --------------------------------------- ***** The pro's on the forum will disagree, for certain. The party line is generally a soft single stage, maintaining shim seat pressure as best possible on the stock piston and use the port restriction for high speed damping. It works for the 12mm rods, but will it for the 14mm?? It didn't for me 3 years ago so why should it now? [img]http://dirtrider.net/ubb2/smile.gif[/img] A different suspension tuner was involved and the promise of relief from square edges was never achieved despite their valve mods. I made lots of shim stacking tests along the way too. All the way to mush, and the HSCD harshness was still there. [img]http://dirtrider.net/ubb2/biggrin.gif[/img] ------------------------------------- BTW - Christmas was good this year, a '00 KTM 250EXC found it's way into my garage. YAHOO!! (already had the comp valve apart and it had shims just like yours plus the 12 x .1 in the HS stack) James [This message has been edited by James Dean (edited 12-28-2000).] [This message has been edited by James Dean (edited 12-28-2000).] [/QUOTE]
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MX, SX & Off-Road Discussions
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shim shuffle - KTM WP forks
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