The same as down shifting.
Match engine speed to gearbox speed.
In the case of up shifting, put the clutch in and wait for engine revs to
drop down to a suitable point. You can also use this technique to drive
without the clutch. Unload the gearbox, pop it into neutral. Let the
engine revs drop while putting slight pressure on the shift lever. When the
engine speed matches the gearbox speed, the gears will pop into mesh.
The upshifting technique is very valuable, as all synchro MGB
trannies tend to get cracked or worn 3rd gear synchro rings. Slam shifting
becomes impossible. Allowing time for the engine speed to drop between the
shift allows crunch free shifting until the trans can be rebuilt.
My daddy taught me to upshift by using a 1-2-3 cadence from gear to
gear. 1- out of gear. 2-leave in neutral. 3-into next gear. The synchros
last much longer when given some time to work.
Kelvin.
> -----Original Message-----
> From: Bill Schooler [mailto:schooler@erols.com]
> Sent: Thursday, January 27, 2000 5:11 PM
> To: David Hill
> Cc: Skye Poier; MG Nuts
> Subject: Re: double / single clutch
>
>
> David,
>
> Have you ever driven a car with a non-synchro gearbox? I
> suspect not -
> since that procedure described by Skye as "single-clutching" would be
> absolutely useless when downshifting into a non-synchro gear.
> (Think of
> a non-synchro gearbox as one with REALLY worn synchro
> cones...) Go with
> Lawrie on this issue - he's right as usual.
>
> By the way, for those who haven't used a non-synchro gearbox,
> and I mean
> all the gears, do you know what the proper clutch/throttle
> procedure is
> for upshifting?
>
> Bill
>
> David Hill wrote:
> >
> > Hello, Skye.
> >
> > IMO, single clutching is essential to the well-being of the
> synchro cones.
> > You are giving them an easy life by matching the revs of
> the engine to the
> > requirements of the new gear ratio.
> >
> > BTW, I've found that dipping the clutch when coming out of
> O/D seems to put
> > less 'shunting' strain on the trans than simply switching
> out directly. Any
> > thoughts?
> >
> > Dave Hill.
> >
> > ----- Original Message -----
> > From: Skye Poier <skye@ffwd.com>
> > To: MG Nuts <mgs@autox.team.net>
> > Sent: Thursday, January 27, 2000 10:35 PM
> > Subject: double / single clutch
> >
> > > I'm getting pretty good at double clutching when I
> downshift, but I'm
> > > curious, is there any benefit to single clutching?
> > >
> > > let's see if i've got this right:
> > >
> > > how normal people downshift:
> > > depress clutch, downshift, release clutch
> > >
> > > single clutch:
> > > depress clutch, shift to neutral, increase rpm,
> downshift, release clutch
> > >
> > > double clutch:
> > > depress clutch, shift to neutral, release clutch,
> increase rpm, depress
> > > clutch, downshift, release clutch
> > >
> > > shortshift:
> > > shifting before peak rpm or revs.. "taking it easy"
> > >
> > > speedshift:
> > > don't use the clutch at all but let off the gas
> > >
> > > powershift:
> > > don't use the clutch and don't let off the gas
> > >
> > > Thanks :)
> > > Skye
> > >
> > > --
> > > 1966 MGB - GHN3L Safety Fast! __,__\__
> > > The MGB Experience http://www.mgb.bc.ca/ (_o____o_)
>
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