I agree w/ Rich. I bought a new BN7 in 1960. When I shifted out of
overdrive going down a hill or coasting, it would actually "chirp" the rear
tires to get the engine up to speed when it shifted. I took it to the
dealer and asked what was going on (had never driven a Healey until this
one). The throttle switch was not adjusted correctly at the factory, dealer
corrected it, drove many wonderful miles after that.
John Snyder
> The main purpose of the throttle switch (besides being fun to use) is that
> when correctly set it won't allow the overdrive to disengage and shock the
> entire power train down into the non overdrive ratio (and possibly cause
> harm) if the throttle is closed. In other words correctly set it requires
> the slight increase in throttle to raise the engine speed to meet the
> disengagement of the overdrive and effect a smooth downshift.
> It cost time and money to install every one on the cars when new. If the
> engineers didn't think it was necessary, they wouldn't have installed it.
>
> Rich Chrysler
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