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Re: [EVDL] Basic drivetrain questions, was Re: Looking for a Conversion Kit for a 192

I think to keep the losses down, you'd need a lockup converter, which adds
some complexity. Plus, the nature of a torque converter is to allow the ICE
to increase RPM during acceleration to where it generates torque, and to
allow the torque converter to do some torque multiplication. So you'd have
to make sure the stall speed was at an RPM where you'd still have enough
volts to keep the motor torque up. But I don't think that would be a
problem with a stall speed lower than an all out drag race convertor. I
think stock converters stall between 1800 and 2400 RPM.

You might get around the heat issue by using a torque converter from some
Vega transmissions. They used the convertor for cooling, with holes in the
bell housing. No cooler on the trans. But I think you'd still need
pressurized oil, and want a lock up feature for efficiency and heat
reduction. And you still have no reverse or park.

Oh, but would there be a way to cruise at highway speeds at 3000 RPM for
efficiency, and upshift to drop the RPM into the motor power band to pass?

Actually, GM used a switchable stall speed converter on some Turbo 400's in
the sixties. I put one in my 68 Camaro back in the day. It was pretty
trick. But again, it takes pressure to switch it.

Marty

----- Original Message -----
From: "Jeff Shanab" <[email protected]>
To: <[email protected]>
Sent: Sunday, August 12, 2007 8:27 AM
Subject: Re: [EVDL] Basic drivetrain questions, was Re: Looking for a
Conversion Kit for a 1929 Ford.


> Probably not. the torque converter is for the low statring torque of the
> ICE. It is the reving motor slipping clutch equivilent of a human being.
>
> But in this case we were talking about a lightweight vehicle with a
> single 9" dc motor, My suggestion was to abuse a torque converter as a
> CVT.
> They are about 4:1 gear ratio as the rpm's pass thru 500 and become
> close to 1:! by 3000 rpm at which point you could lock it in. We would
> almost want a "low stall" unit.
>
> The other issue with this device is that the stock ones expect the oil
> to be cooled externally.
>
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