clutch pedal vibrates when not warmed up

[deegaw11]

my clutch pedal vibrates when it isnt warmed up, i put in an ACT HDss about 1500 miles ago. once i drive the car for a lil while till it warms up then it goes away. is this normal? i dont have any lock out issues.

[Duh Panda]

ACT clutches suck... shouldve gone with at least an Exedy..
throw out bearing? not properly aligned? or maybe your still breaking the clutch in...

[EVIL MR]

Mine now does the same thing cold or hot + all the lockout you need. ACT is very ****y clutches for evos.

[EVOIXreno]

Originally Posted by EVIL MR

Mine now does the same thing cold or hot + all the lockout you need. ACT is very ****y clutches for evos.

that's he truth. Had a street disk from act and went to exedy a couple weeks later!!

[Sales@ACT]

Originally Posted by deegaw11

my clutch pedal vibrates when it isnt warmed up, i put in an ACT HDss about 1500 miles ago. once i drive the car for a lil while till it warms up then it goes away. is this normal? i dont have any lock out issues.

Since the clutch has no idea whether your car is warmed up or not, the vibration has nothing to do with the clutch.

[bluebanana23]

^ I'm no clutch expert or even a novice but we all know metal expands when heated...If it's any constellation, my stock exedy engages a little funny until it warms up. No, it's not slipping.

[Sales@ACT]

Originally Posted by bluebanana23

^ I'm no clutch expert or even a novice but we all know metal expands when heated...If it's any constellation, my stock exedy engages a little funny until it warms up. No, it's not slipping.

Yes metal expands when it is heated up, that was never in question here. The OP inferred that after his car (engine) was warm the pedal stopped vibrating. So we are not talking about the same thing here.

His engine may have a vaccum leak that may cause the engine to vibrate on cold start and cause vibration through the clutch pedal but I'm certain it's not directly related to the actual clutch. Possibly the installation.

Both the stock clutch and any of the ones that we manufacture do not require a certain amount of heat to reach optimal clamp load or performance since that is determined by the diaphargm on the pressure plate. Carbon on carbon clutches work that way, and get better as they are heated up. The only time where heat becomes a factor on a organic or puck style clutch is if it is heated past a certain point (either the pressure plate casting or the friction material) where the material warps and the clutch slips.

[94AWDcoupe]

Originally Posted by deegaw11

my clutch pedal vibrates when it isnt warmed up, i put in an ACT HDss about 1500 miles ago. once i drive the car for a lil while till it warms up then it goes away. is this normal? i dont have any lock out issues.

This is not normal. It is same as having warped brake rotors. Brakes are smooth when cold. Brake pedal "pulses" when rotors are hot. The pulse comes from the rotor wobbling under the brake pads. If a clutch pedal has a vibration or a pulse its because the fingers on the pressure plate are "warped" this causes the throw out bearing to wobble. The problem could be any one of the clutch components. fly, disc, pressure plate, or throw out bearing.

And I disagree with above statement by the act man. no way would a rough idle be felt at clutch pedal. engine moving around does not cause clucth pedal to move around. fluid beling puched backwards causes the pedal to move. and that happens only when the TOB is not spinning true.

[bluebanana23]

[quote=Sales@ACT;6086104]Yes metal expands when it is heated up, that was never in question here. The OP inferred that after his car (engine) was warm the pedal stopped vibrating. So we are not talking about the same thing here.


Not trying to be a dick but there's ambiguity here and my logic is not exactly flawed. Yes, the OP did state after he drove the car awhile the vibration is gone but you cannot expect him not to use the clutch while driving. So therefore the clutch "warms up" to operating temperature. But, of course, your advice and insight is much more of value since you actually sell the clutch.

[razorlab]

Originally Posted by bluebanana23

If it's any constellation, my stock exedy engages a little funny until it warms up.

Which constellation would that be? Andromeda? Aquarius? Orion?

[ultimatesteve]

Lmao!!!

[Sales@ACT]

Originally Posted by 94AWDcoupe

This is not normal. It is same as having warped brake rotors. Brakes are smooth when cold. Brake pedal "pulses" when rotors are hot. The pulse comes from the rotor wobbling under the brake pads. If a clutch pedal has a vibration or a pulse its because the fingers on the pressure plate are "warped" this causes the throw out bearing to wobble. The problem could be any one of the clutch components. fly, disc, pressure plate, or throw out bearing.

To achieve greater clamp load our pressure plate diaphragm is heat treated in an oven then aneeled and sees greater tempratures than it will ever see bolted to a flywheel. In addition the diaphram fingers do NOT make contact with the friction surface like a brake pad does with a rotor. That is the job of the pressure plate casting.

If the fingers on the diaphram were bent it would stay bent and based on your theory it should cause vibration through the pedal at all times since it is not possible for it to bend and return to it's proper state after cooling. The same goes for the disc and the flywheel. In fact from the OP's statement the problem goes away after the car is warm so it has even less to to with the warped brake rotor rationale.

[bluebanana23]

lol, I meant consolation. Wow, past my bedtime!

[Sales@ACT]

Originally Posted by bluebanana23

lol, I meant consolation. Wow, past my bedtime!

Yeah that was pretty funny but I wasn't going to call you on that.

[deegaw11]

im guessing the vibration goes away after the clutch warms up because my car idles smooth as hell so it has nothing to do with the engine i think, also is it normal that sometimes my engagement is smooth as hell with the ACT but sometimes it would chatter extremely bad??