New Ohlins front end review

**Mishy** · 29th May 2009, 21:43

Originally Posted by Robert Taylor

Thin''scrubbing'' shims. In regular ''single tube'' systems the more agressive the stack ( especially on midvalve ) the greater the chance of cavitation. I need to describe and show you this one on one. JD may want to elaborate in writing.
I disagree with you about stiction.
Night.

So i'm assuing that the strong mid valve can be what causes the pressure imbalance that causes cavitation ? if i remember rightly the mid valve would need to be weaker than the base valve to allow a re-balance of pressure as the fork compresses, and a strong midvalve would lead to over use of the base valve, with a corresponding drop in pressure above the midvalve ?

**JD Racing** · 29th May 2009, 23:04

Originally Posted by Mishy

So i'm assuing that the strong mid valve can be what causes the pressure imbalance that causes cavitation ? if i remember rightly the mid valve would need to be weaker than the base valve to allow a re-balance of pressure as the fork compresses, and a strong midvalve would lead to over use of the base valve, with a corresponding drop in pressure above the midvalve ?

The midvalve needs to be weaker than the base and weak enough at low cartridge pressure to prevent cavitation, it's generally used to supplement the base, it's not that big a deal, it's not the only method to add damping.

**Robert Taylor** · 30th May 2009, 10:28

Originally Posted by Mishy

So i'm assuing that the strong mid valve can be what causes the pressure imbalance that causes cavitation ? if i remember rightly the mid valve would need to be weaker than the base valve to allow a re-balance of pressure as the fork compresses, and a strong midvalve would lead to over use of the base valve, with a corresponding drop in pressure above the midvalve ?

Also the base valve works on shaft displacement, primarily.