Laurel Pearl schrieb:
> I was just looking around on Douglas Greville's page and came upon the
> warning regarding pre-selective gearboxes. Having only driven a manual
> and an auto, i have never heard of this type of transmission. Would
> someone be so kind as to explain how they work/are driven?
>Dear Laurel,
>a pre selective gearbox is a mechanical gearbox with a mechanical clutch.
>The difference is, that you don't have a big gearshift lever. You only
>have a little (most electrical) switch. To shift the gears they don't use
>your muscle power, they use electric power or air pressure or vacuum.
>
Hi,
Andreas is quite right in his description, however you will find the Wilson
pre-selector in the Ferret, Saracen and Saladin a little different in that
there is a "clutch" pedal in the expected place which isn't in fact a clutch
at all but the gear change pedal; people who have mistakenly used it as such
rapidly burn out the epicyclic gearbox brake bands.
These vehicles have a fluid flywheel so you can think of them as a "1/2"
automatic and will therefore start and stop using only the brake and
accelerator.
Richard
(Southampton UK)
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