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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
explanation of fluid flow thru forks and shock
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[QUOTE="JTT, post: 478580, member: 19620"] Basically the piston is made up of, lets say for ease of discussion, 8 ports. 4 ports flow one way, 4 the other. If you were to look at the piston on one side, you would see 4 raised shouldered ports...kind of like castle tops...boy, this is hard to explain in words :think: Anyways, the shims sit on top of these shoulders covering the ports. The area below the shouldered ports are where the ports from the other side exit. The same goes for the other side of piston. Now, the fork compresses....oil flows through the piston from under the rebound shims (remember, they are up on the shouldered rebound ports and oil can flow under then through the exposed side of the compression ports. Fluid flows through these ports, and then hits the compression shim stack, flexing it and flowing through. On rebound, these shims close, creating a check valve preventing fluid from flowing back the way it came, so it find the "other" route, through the ports exposed by the shoulders. Imaging the compression shims sitting on four small vertical tubes sitting on a plate with 8 holes in it....now add four more tubes, the same as the first on the bottom side of the plate, only on the "other" four holes. The rebound shims cover these over. This is effectively how the piston is configured. Hope this makes some sense. I know it is confusing, but if you ever get to see a piston, it will all make sense...I hope. :eek: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
explanation of fluid flow thru forks and shock
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