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Double clutching to save wear on Synchros
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23-01-2010 6:32pm#1
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http://www.singster.co.uk/mascot%20mar-apr%202003%20(4).htmlIf your car has a synchromesh gearbox it is recommended you do not double-de-clutch as this can cause undue wear on the synchro rings. TC
... because you're in effect using the syncro rings twice as much
(not to mention the clutch)0 -
Hi Guys.
It would be interesting to get some opinions on this.
I always double clutch my car both up and down through the gears, I really only do it for the craic purely because I love driving(heel toe braking+double clutching=sex:D)
Anyway I reckon that doing this saves wear on the baulk rings in the box because they are not being used as much and it puts less pressure on the clutch if at the time of engagment both plates are spinning at the same speed.
I could be wrong on this but a friend reckons its completely pointless on a modern car as they have already been set up to take the extra strain and theres no need with a modern transmission anyway.
Any ideas folks?
Either way I suggest you try it because it sounds cool to:pac:
There's really no need double declutch becuase of the synchromesh, but it sounds like fun. Everyone I know who tried it nearly went through the windscreen though 0 -
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http://www.singster.co.uk/mascot%20mar-apr%202003%20(4).html
... because you're in effect using the syncro rings twice as much
(not to mention the clutch)
I thought I was eliminating their need to even be there thus saving wear.
I'm sad now:( :P
I'm still going to do it because its fun:P0 -
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**Timbuk2** wrote: »OK, sorry to sound stupid, but I still don't get the point of double clutching. When you are changing down gears, if you clutch in, aren't you taking it out of gear, i.e. neutral. Taking the clutch out in neutral won't make any difference, will it?
When you press the clutch pedal, you interrupt the connection between engine and gearbox, you're not automatically in neutral.
Neutral is when the gearstick is between gears, in the middle position.
On modern gearboxes there is no point in double clutching ...that's what the syncromesh is for.
This vid is of an old truck without syncromesh where you HAVE to double-clutch in order to shift gears ...only that yer man ins't very good at it ...listen for the crunching noises
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+1 im lost,when changing from 3rd to 4th (for example) you clutch in,put it into neutral,clutch off,???,clutch in then into 4th?
The engine/gear combination at the same speed turns slower in 4th than it would in third.
When you're shifting down from 4th at say 2000 rpm you end up in 3rd at 3500 rpm (for example)... the difference of 1500 rpm has to be matched somehow for the gears to be able to engage.
On a modern gearbox the syncromesh takes care of that.
On a non syncro gearbox you have to: clutch in - engage neutral -clutch out - spin engine & gearbox in neutral near to 3500 rpm - clutch in - select 3rd - clutch out.
If you don't get it rigth 3rd will not go in and you'll hear that terrible grinding noise instead 0 -
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My late grandfather passed his driving test 80 years ago. He had to double declutch in the small truck he passed his test in (and the indicators were hand pulled and his seat was a sack of spuds - but that's asides). And even way back then the synchromesh had already been used in some cars.
Now move on folks - it's 2010 and that silly little third pedal (counting from right to left) will be gone soon 0 -
Now move on folks - it's 2010 and that silly little third pedal (counting from right to left) will be gone soon
I have to say though, it is immensely satisfying when you get handed one of those non-syncromesh monsters (like in my vid above) and after some crunching you actually get to drive it like it's meant to be driven.
Automatics are girly stuff
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The engine/gear combination at the same speed turns slower in 4th than it would in third.
When you're shifting down from 4th at say 2000 rpm you end up in 3rd at 3500 rpm (for example)... the difference of 1500 rpm has to be matched somehow for the gears to be able to engage.
On a modern gearbox the syncromesh takes care of that.
On a non syncro gearbox you have to: clutch in - engage neutral -clutch out - spin engine & gearbox in neutral near to 3500 rpm - clutch in - select 3rd - clutch out.
If you don't get it rigth 3rd will not go in and you'll hear that terrible grinding noise instead
christ that sounds like a lot of work:)
but how would you know if you were at the right revs to downchange?0 -
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https://www.youtube.com/watch?v=Vg1FTZduqRg
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