A point or two on this general thread that I don't understand.
Is there anything intrinsically wrong in using an 80W/90 gear oil as
recommended by the factory?
I've always used it in the Triumphs I've had down the years and with no problem
at all. What are the
benefits (proven or otherwise) of using a lighter weight oil? Is it to enable
faster changes - or
what?
With regard to engagement, some overdrives 'slur' into work, others engage with
a mighty thump. Am I
reading here that users prefer the violent to the more gentle? If so, then the
'thumper' on engaging
is putting a strain on the engine as it somehow has to suddenly lose some
500-750rpm and the
flywheel needs immediate slowing. It's different on dis-engaging as an extra
500-750rpm has to be
found and its all the moving parts from the tyre tread forwards to the engine
that does this - wheel
splines, diff gears, diff nose piece, hardy spicers, gearbox, clutch, flywheel,
crank and conrods
suddenly get accelerated. It's not surprising there's a jerk!
Maybe I've been plain lucky because all my overdrives have been of the 'slur'
type and I wouldn't
have it otherwise. Perhaps it's my own driving style but with or without
overdrive I can't stand
jerkiness or transmission snatch, so I always match engine speed to roadspeed
as closely as I can on
down changes. 'Dipping' the clutch to achieve the smoothness I seek is usually
the only way to get
what I want but even so, it can be done quite fast. Fred Thomas once told me he
thought I drove an
overdrive car differently to others he knew and to this day, I'm still not sure
what he meant :)
Jonmac
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