[Reason077]

I've driven manuals most of my life. Before stop/start came along, I was in the habit of just holding the clutch pedal down while stopped at intersections or in traffic. Anecdotally, I think most drivers do the same.

Now, when driving stop/start equipped vehicles, I always try to use it. But in a manual, it does takes more thinking and effort and I wonder how many casual drivers actually bother.

The thing is, most of the time you don't really know how long you're going to be stopped for. Will that light take 3 seconds or 30? A manual makes you decide whether to stop the engine, but an automatic just does it every time without having to think about it or perform extra steps. (although, you can override it if you know it's going to be a short stop by just pressing the brake lightly.)

[djsumdog]

I drove a WRX for five years and the clutch was kinda heavy. Not terrible, but enough that I'd put the car I'm neutral at a red light of I was there for more than five seconds.

I'm glad start stop is supported on manuals this way. It makes sense. I thought the stop start systems didn't really save much fuel, but I've read some real world tests that clock in at 8~10% savings. All that idle time does really add up.

[blub]

I consider holding the clutch down really unusual. Never did myself except when I was pretty sure that start/stop would trigger unnecessarily.

Now I just don't care about that, since it was too annoying at stop lights, which has led to incidents of auto-stop and immediate start and even a half auto-stop. Didn't notice and bad effects on the car.

[mnw21cam]

> I was in the habit of just holding the clutch pedal down while stopped at intersections or in traffic.

If you take a driving test in the UK and do this, that would be a minor fault. You can only have a few minor faults before you fail the test. The rationale is that you need to be in full control of the car at all times, and when you set off you mustn't drift backwards at all. The easiest way to do this without needing three legs is to use the handbrake. Unless you have a diesel engine that has enough torque without any pressure on the accelerator pedal to pull away.

[JetSetWilly]

There's lots of minor faults that don't reflect how people actually drive.

For example if you are turning right and waiting for oncoming traffic to clear, then someone pauses and flashes their lights to let you turn, if you then turn that would be a minor fault in Driving Test conditions - where you are supposed to ignore the driver inviting you to turn and sit like a diddy.

Also you are allowed 15 minor faults before failure, which is quite a lot really.

[Reason077]

Huh? Whether or not you put the shifter in neutral has no effect on handbrake (hill) starts. You can still (more quickly, in fact) perform a hill start without also having to put the car back in gear.

And now days, newwer cars have the "hill hold" feature which automatically prevents you rolling backwards anyway.

[Annatar]

Before stop/start came along, I was in the habit of just holding the clutch pedal down while stopped at intersections or in traffic. Anecdotally, I think most drivers do the same.

I usually keep my foot to the side, as I was explicitly taught in driving school by a professional instructor to do. And if the master cylinder ever starts to malfunction, since the plate spacing is really tight, keeping the clutch pedal depressed while stopped could prematurely burn up the clutch and the torque plate.

[JoeAltmaier]

Its called 'riding the clutch'. But all you have to do to avoid the wear is keep it fully depressed. End of moralizing.

[Shorel]

I don't hold the clutch for too long because that will increase the effort from my left foot, and I don't like how it feels after a week of driving that way.

So, it may require more thinking, but I can rest my feet while the light is red and it actually feels good.

[vetinari]

By holding down the clutch pedal, you are literally destroying the clutch. When I was in the driving school, I was taught to never do this. If you are stopping, even for just few seconds, put in the neutral. It becomes automatic movement in a short time.

Few years ago, I had colleagues who came from a certain foreign country and were not used to manual transmission. They got a company car with manual transmission. The clutch was burned in one month.

[JetSetWilly]

I don't think having the clutch down destroys the clutch, how would it do that? It is having the clutch partially engaged for a very long time that would destroy the clutch.

A clutch is destroyed by friction - slippage between the two plates that comprise it. This is a useful characteristic when pausing on a hill for a few seconds but I suppose there must be some people that keep the clutch partially engaged for a very long time.

But if you are sitting at a junction with the clutch entirely depressed for a long time the plates are disengaged and no damage is done. That's a bad habit for other reasons, such as if you get rear ended your car is still in gear and could then cause a further accident.

[Reason077]

That's right. Driving with the clutch partially engaged will wear it out. But having it fully engaged while the vehicle is stopped won't do any harm.

[jpindar]

It will wear out the throwout bearing.

[jessaustin]

Having driven manual pickup trucks for hundreds of thousands of miles, I'm sure this will happen eventually, but it hasn't yet...

[jpindar]

But do you hold the clutch in when stopped?

I generally don't. I too have driven several manual pickups, and only once had a squeaky throwout bearing. But I bought that one used so who knows what it had gone through before me.

[Unklejoe]

And crankshaft thrust bearings, which could ultimately lead to crank walk. It's more of an issue on high performance AWD cars which require extremely strong clutches. All of that clamping force (probably thousands of pounds) is essentially pushing the crankshaft "into" the engine.

Some engines are more susceptible to this than others.

[flyinghamster]

Holding down the clutch pedal when stopped won't harm the clutch, but it may put excess wear on the throwout bearing that allows it to slide back and forth.