Nissan Micra CVT geerbox failure - upshot
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From: Dave Plowman (News) on 5 Mar 2007 14:31 In article <5532ppF23brovU1(a)mid.individual.net>, Ian Johnston <ian.groups(a)btinternet.com> wrote: > Apparently this one doesn't have a powder clutch - it has a torque > converter. Hmm. The idea of a TC is to bridge the fixed ratios in a conventional auto, and in doing so it wastes rather a lot of power - hence these transmissions don't get used much in small cars. A CVT doesn't have fixed ratios so has no need of a torque convertor which would negate the better efficiency of the design anyway. It could be a fluid flywheel, I suppose, but again these reduce the efficiency. I think you may need to find an auto specialist who isn't pulling your plonker... -- *I'm already visualizing the duct tape over your mouth Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Ian Johnston on 5 Mar 2007 18:02 On Mon, 05 Mar 2007 19:31:24 +0000, Dave Plowman (News) wrote: > In article <5532ppF23brovU1(a)mid.individual.net>, > Ian Johnston <ian.groups(a)btinternet.com> wrote: >> Apparently this one doesn't have a powder clutch - it has a torque >> converter. > > Hmm. The idea of a TC is to bridge the fixed ratios in a conventional > auto, and in doing so it wastes rather a lot of power - hence these > transmissions don't get used much in small cars. A CVT doesn't have fixed > ratios so has no need of a torque convertor which would negate the better > efficiency of the design anyway. It could be a fluid flywheel, I suppose, > but again these reduce the efficiency. I think you may need to find an > auto specialist who isn't pulling your plonker... Thanks. The place in question - Mackie's in Glasgow - apparently does all the overhauling for Nissan UK in Scotland under contract, so I expect they know what they're on about. "Torque converter" could have been my mishearing - of course you are quite right that a CVT box shouldn't need one. Apparently you can tell by looking at the gearbox casing: if it has an oil filter it doesn't have an electric clutch. Ian
From: MrCheerful on 6 Mar 2007 02:55 "Ian Johnston" <ian.groups(a)btinternet.com> wrote in message news:553ls8F23brovU14(a)mid.individual.net... > On Mon, 05 Mar 2007 19:31:24 +0000, Dave Plowman (News) wrote: > >> In article <5532ppF23brovU1(a)mid.individual.net>, >> Ian Johnston <ian.groups(a)btinternet.com> wrote: >>> Apparently this one doesn't have a powder clutch - it has a torque >>> converter. >> >> Hmm. The idea of a TC is to bridge the fixed ratios in a conventional >> auto, and in doing so it wastes rather a lot of power - hence these >> transmissions don't get used much in small cars. A CVT doesn't have fixed >> ratios so has no need of a torque convertor which would negate the better >> efficiency of the design anyway. It could be a fluid flywheel, I suppose, >> but again these reduce the efficiency. I think you may need to find an >> auto specialist who isn't pulling your plonker... > > Thanks. The place in question - Mackie's in Glasgow - apparently does all > the overhauling for Nissan UK in Scotland under contract, so I expect they > know what they're on about. "Torque converter" could have been my > mishearing - of course you are quite right that a CVT box shouldn't need > one. Apparently you can tell by looking at the gearbox casing: if it has > an oil filter it doesn't have an electric clutch. > > Ian depends on the year, later ones ? have a torque converter
From: Dave Plowman (News) on 6 Mar 2007 05:59 In article <689Hh.60688$1E3.54418(a)fe3.news.blueyonder.co.uk>, MrCheerful <nbkm57(a)hotmail.com> wrote: > > Thanks. The place in question - Mackie's in Glasgow - apparently does > > all the overhauling for Nissan UK in Scotland under contract, so I > > expect they know what they're on about. "Torque converter" could have > > been my mishearing - of course you are quite right that a CVT box > > shouldn't need one. Apparently you can tell by looking at the gearbox > > casing: if it has an oil filter it doesn't have an electric clutch. > > > > Ian > depends on the year, later ones ? have a torque converter With a CVT? Can you guess at why? Seems a nonsense to me. -- *Time is the best teacher; unfortunately it kills all its students. Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Duncan Wood on 6 Mar 2007 06:18
On Tue, 06 Mar 2007 10:59:02 -0000, Dave Plowman (News) <dave(a)davenoise.co.uk> wrote: > In article <689Hh.60688$1E3.54418(a)fe3.news.blueyonder.co.uk>, > MrCheerful <nbkm57(a)hotmail.com> wrote: >> > Thanks. The place in question - Mackie's in Glasgow - apparently does >> > all the overhauling for Nissan UK in Scotland under contract, so I >> > expect they know what they're on about. "Torque converter" could have >> > been my mishearing - of course you are quite right that a CVT box >> > shouldn't need one. Apparently you can tell by looking at the gearbox >> > casing: if it has an oil filter it doesn't have an electric clutch. >> > >> > Ian > >> depends on the year, later ones ? have a torque converter > > With a CVT? Can you guess at why? Seems a nonsense to me. > Well it's probably cheaper than a magnetic clutch & if it's attacged to a CVT you can lock it up almost immediatly. |