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Evo Engine / Turbo / Drivetrain Everything from engine management to the best clutch and flywheel.
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Old Jan 20, 2010, 12:23 PM   #1
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PULL type clutch? Someone Please Explain

I have done multiple searches and can't find ANYTHING that can help a visual guy like me.

So i understand how a normal clutch works, But what i cant seem to wrap my head around is our "pull" type clutch works.

So, when i press the pedal in, it pulls the clutch disk away from the flywheel?

at what point is there NO load on the TOB? when the clutch pedal is IN? or while the clutch is disengaged (in neutral at a stop light) and there is no foot on the clutch pedal?

any visual aids would help, Im a noob to these vehicles, so thanks for the input.

Mark
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Old Jan 21, 2010, 06:58 PM   #2
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You're in luck. I was trying to explain how a pull clutch works to a dude online and for the life of me he didn't get it so I dug up this picture. It makes it pretty clear.

Click the image to open in full size.
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Old Jan 22, 2010, 07:38 PM   #3
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The illustration is great, but unfortunately the logic in the text is flawed. When it comes to a simple change in leverage, you cannot get something for nothing. Whenever you lighten up the pedal effort by a change in geometry, you reduce the lift of the pressure plate from the disc and suffer from inadequate disengagement or less torque capacity in order to make up for the lighter pedal effort.

The real advantage to the pull type system is that the pressure plate is a lot more efficient. Because the pressure plate is loaded in one direction only (toward the transmission) and the diaphragm is supported closer to the clutch bolt flange, there is significantly less deflection (flex) which is basically wasted travel. Any time you reduce travel to accomplish the same clamp load and lift, you can take advantage of the better efficiency by reducing pedal effort or pedal stroke.
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Old Jan 22, 2010, 07:52 PM   #4
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^+11ty billion... best explanation I've seen in a while. figures coming from Clutch-man.. hahaha..
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Old Jan 22, 2010, 08:32 PM   #5
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Nevermind where the dashed lines are, the two lever arms in the illustration are about the same.
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Old Jan 23, 2010, 08:43 AM   #6
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thank you!
this is very helpful and is EXACTLY what i've been trying to hunt down.
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Old Dec 26, 2010, 10:45 PM   #7
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Old Dec 26, 2010, 10:45 PM
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adjustment, advantages, clutch, diagram, disc, double, evo, install, mack, pull, truck, type, work, works, wrx

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