[Healeys] Fw: Question for Shop Owners / Restorers Only - OD ThrottleSwitch

[John Snyder]

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