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It won't. Unless the clutch is damaged and slipping, or slipping because your foot is resting on the pedal, it's all locked together and it's not going to wear.

It won't. Unless the clutch is damaged and slipping, or slipping because your foot is resting on the pedal, it's all locked together and it's not going to wear. You will always cause a bit of wear to the clutch while shifting, but that's a different conversation. (with all the rev matching that the newest manual transmissions will do for you, I wonder if replacing clutches during the normal lifetime of a passenger car will become a thing of the past, but it's too soon to say for sure)

greglindahl 8y ago
Well, if most cars become electric and have one gear, it's safe to say that your question will be answered "yes".
- deleted 8y ago
  [deleted]
mmt 8y ago
That was, essentially, my point. (Foot resting on the pedal heavily enough that it slips doesn't count as fully engaged, of course). > I wonder if replacing clutches during the normal lifetime of a passenger car will become a thing of the past My gut says that clutches wear far more from starting at a dead stop than from any gear changes in motion, so taking rev-matching out of the hands (foot) of the human won't make enough of a difference.
- justin66 8y ago
  That's an interesting question. There's a lot more time spent slipping the clutch getting the car started, but there are higher RPMs and more power being transmitted through the partially-engaged flywheel and clutch during some of the other shifts. But yes, intuitively, it definitely feels like starting the car is when most of that wear happens, and if I had to bet I would bet that's right, at least during everyday driving.
  - mmt 8y ago
    > there are higher RPMs and more power being transmitted through the partially-engaged flywheel and clutch during some of the other shifts. I'd argue that, if that's the case, one isn't doing it right. Ideally, there is zero RPMs difference during disengagement and engagement during routine gear shifting. One doesn't even need the clutch, if one is good enough at rev-matching. I expect the risk of damaging a gear or synchro makes this a bad idea in general practice, but it can help get a clutch that no longer fully disengages to a mechanic without a tow-truck, something important in my younger/poorer days.

greglindahl 8y ago

Well, if most cars become electric and have one gear, it's safe to say that your question will be answered "yes".

deleted 8y ago
[deleted]

mmt 8y ago

That was, essentially, my point. (Foot resting on the pedal heavily enough that it slips doesn't count as fully engaged, of course). > I wonder if replacing clutches during the normal lifetime of a passenger car will become a thing of the past My gut says that clutches wear far more from starting at a dead stop than from any gear changes in motion, so taking rev-matching out of the hands (foot) of the human won't make enough of a difference.

justin66 8y ago
That's an interesting question. There's a lot more time spent slipping the clutch getting the car started, but there are higher RPMs and more power being transmitted through the partially-engaged flywheel and clutch during some of the other shifts. But yes, intuitively, it definitely feels like starting the car is when most of that wear happens, and if I had to bet I would bet that's right, at least during everyday driving.
- mmt 8y ago
  > there are higher RPMs and more power being transmitted through the partially-engaged flywheel and clutch during some of the other shifts. I'd argue that, if that's the case, one isn't doing it right. Ideally, there is zero RPMs difference during disengagement and engagement during routine gear shifting. One doesn't even need the clutch, if one is good enough at rev-matching. I expect the risk of damaging a gear or synchro makes this a bad idea in general practice, but it can help get a clutch that no longer fully disengages to a mechanic without a tow-truck, something important in my younger/poorer days.