To clarify, this wouldn't be used in a Spitfire - I'm
building a trike using a '79 Honda CX500 (32 foot
pounds of torque, 50 hp, shaft drive that turns the
same direction as a car's propshaft) with a Spitfire
rear end, axles, etc.
What I'd like to use (but can't find under $300) is a
3.27 differential from a non-OD GT6 - that ratio would
be sufficiently higher than the donor bike's final
drive ratio of 3.09 to compensate for the extra weight
of the trike. A 3.89 Spit diff would cut down
cruising speed too much.
What I already have is a MkIV Spitfire parts car with
OD. When combined with a 4.11 rear end, the OD would
provide an overall ratio of 3.29 - close enough to
what I really want, and free!
There'd be no powered Reverse on the trike, but I
would be pushing it backwards from time to time -
would that also "toast" the OD if engaged at the time
(or all the time)?
Given all that, are there better solutions? I've even
thought about bodging a chain and sprockets
"overdrive" like the sketch at
http://www.carcentric.com/trikeoverdrive.gif
M D "Doc" Nugent
Renton, WA
--- "Gosling, Richard B"
<Richard.Gosling@atkinsglobal.com> wrote:
> The O/D cannot handle the maximum torque it would
> receive from the gearbox
> in first and second gears - that is why there is a
> cut-out fitted that only
> allows it to work in 3rd and 4th. Worse, if the O/D
> is ever engaged and the
> car put into reverse, it is toast.
>
> Sorry, I don't think a permanantly engaged O/D is
> such a great idea!
>
> Richard Gosling
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