I am working on a motor swap of putting a modern engine into an old car. In the process I am adding a clutch master cylinder off of a 1994 BMW 530i because it's mounting and design will work well in my application. But my question is for the ones that know something about hydraulics. On the BMW that it is coming off of, it has about 3 feet of steel line going around in a loop before connecting to the rubber hose for the slave cylinder. What is the purpose of all this extra tubing? In my application the Master is less than 1 foot away from the slave cylinder. Do I need to add a few feet of steel tubing in between them? Here is a link to diagrams of the BMW setup. http://www.realoem.com/bmw/showparts.do?...hg=21&fg=10
Hydraulic Question
- Thread starter Nicolai
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I imagine it's to supply enough fluid to operate the clutch system.
Wouldn't work so well with a few ounces of fluid.
My first rule of thumb when working on vehicles =
Don't argue with the original engineers.
Wouldn't work so well with a few ounces of fluid.
My first rule of thumb when working on vehicles =
Don't argue with the original engineers.
ls1mike
$50 Site Donor 2025
Could be for expansion of the hose as well. My Trans Am has a Hydraulic clutch and it has nothing like that.
Maybe for cooling to keep hot fluid away from the master cylinder?
That must be the secret magic behind BMW's smooooooth clutch take up lol.
It's only purpose is to absorb vibration so the metal line does not break. It does not have any other function. You can use a line as short as you like with no problems.
Volume has nothing to do with it.
It is for flex and movement, . A short solid line would fatigue and crack.
It is for flex and movement, . A short solid line would fatigue and crack.
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+3 ..the displacement is done with the piston/bore on the master. The lines are just for transmission.
That said, Nicolai has to hope that the volume displaced at the master is enough to move the slave the appropriate amount of travel ..this assumes that they are not matched (he only stated that he was using the clutch master cylinder and not the master/slave combo.
Jeeper's who mix parts up run into this from time to time. If the wheel cylinder is too big in diameter it won't push the shoes out enough for braking. It will distribute the volume over too broad and short an area/depth. Same displacement, less motion.
That said, Nicolai has to hope that the volume displaced at the master is enough to move the slave the appropriate amount of travel ..this assumes that they are not matched (he only stated that he was using the clutch master cylinder and not the master/slave combo.
Jeeper's who mix parts up run into this from time to time. If the wheel cylinder is too big in diameter it won't push the shoes out enough for braking. It will distribute the volume over too broad and short an area/depth. Same displacement, less motion.
Originally Posted By: mechtech2
Volume has nothing to do with it.
It is for flex and movement, . A short solid line would fatigue and crack.
Exactly correct. The master cylinder is mounted on the body, the slave is mounted on the engine/trans. That moves around a lot. The rubber line can only bend, it can't absorb the other types of motion that will occur.
If your application is set up to make sure the hard lines won't be flexed and the rubber line can endure all the motion, you don't need them. But if it was my setup, I'd make sure strain and stress relief was overengineered. I'd hate to lose the clutch in a weird scenario.
Volume has nothing to do with it.
It is for flex and movement, . A short solid line would fatigue and crack.
Exactly correct. The master cylinder is mounted on the body, the slave is mounted on the engine/trans. That moves around a lot. The rubber line can only bend, it can't absorb the other types of motion that will occur.
If your application is set up to make sure the hard lines won't be flexed and the rubber line can endure all the motion, you don't need them. But if it was my setup, I'd make sure strain and stress relief was overengineered. I'd hate to lose the clutch in a weird scenario.
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