Fork adjusters

[yorkie_chris]

Originally Posted by alpinestarhero

You guys should teach!

They seem to be doing a pretty good job of that in this thread already

Originally Posted by zadar

with cartridge fork you can tune brake dive to degree.

Thats the point of them isn't it? To be able to set some difference between high and low speed compression damping, or at least keep the level of damping the same rather than the square law that results from fluid flow through a compression hole in damper rod forks.

dive is separate from low/high speed.I am not talking about adjusters for damping.

[yorkie_chris]

Surely dive is the forks compressing, so any control of dive must be done by increasing the level of damping?

Are you meaning anti-dive systems which change this by action of the brakes' hydraulics?

yes,it is increase of damping but not one you thinking off.you want adjusters in range,you slow down dive internally.newer generation of forks has midvalve but there are other ways.
anti dive system of past is something that does not work.you dont see it any more.there are many ways to stop forks from diving but most dont work to good because they screw up rest of movement.

Originally Posted by Blue_SV650S

An ‘emulator’ is basically just that, it is emulating this superior cartridge setup. In the SV you drill the damper rods to lessen/try and negate their effect and slot the emulator in there. The emulator has/is a little (yet basic) petal stack – job done!! … unfortunately its not as good as a full cartridge as the emulator only works on the compression damping (and is very basic/crude in design) …

The low speed compression damping on an Emulator is controlled by the bleed hole in the centre brass washer that is under the spring and high speed is controlled by the spring force on the same washer/top hat.
The pre-load and rate of the emulator spring determines what point the damping crosses over from low to high speed.
The shim in the middle of the emulator is just a check valve to allow oil flow on the rebound stroke.

There is a pretty large amount of adjustment available from an emulator, with different spring rates, oil weights and bleed sizes, they are very good at what they are intended for.
A cartridge gives alot more scope for adjustment and control, but for a simple design the emulator performs really well.

Originally Posted by zadar

yes,it is increase of damping but not one you thinking off.you want adjusters in range,you slow down dive internally.newer generation of forks has midvalve but there are other ways.
anti dive system of past is something that does not work.you dont see it any more.there are many ways to stop forks from diving but most dont work to good because they screw up rest of movement.

The new Matris forks now come with an external adjustable bottom out system, ive yet to get inside a set to see how they've done it.

Their cartridges have a bottom out cup on top of the compression stack with a valve that is shimmed for both directions on top(or underneath ) the rebound stack.

shim stack on other side of rebound valve(replacing check plate)is called midvalve.
06/07 gsxr's come stock with it.but valves also have bleed holes.

No sorry I didn't explain very well, the bottom out cup is about 3" long and has a thread on it which is the nut for the compression stack and the rest of the stack/valve is normal shimstack and check valve.
The rebound valve stack nut is about 1" long with a simply valve on the end of it with a basic shim stack on either side of it, the rebound valve stack and check valve are as normal with no mid valve just normal check valve.

So the bottom out can be re-shimmed as required and I assume their forks have this setup but with an adjustable bleed.

I started to draw it but my pc died whilst in photoshop, I'll try and get some pics, they're beautifully made (over engineered), right down to the thrust bearing/finger preload adjusters.

[dirtydog]

Jeez it all sounds a bit complicated to me, think i'll just stick with my progressive springs, 15w oil, adjustable fork tops and just eat less pies!

Oops Sorry another thread Hijack