[Healeys] Rich ? overdrive

[Greg Mandas]

Newbie Here!!!!

Ok, I paid my $100 and spent a weekend driving around Mid-Ohio Raceway when I
owned a '79 BMW 528 and that's my track experience.

Overdrive in competition!?!? Something I never though of or about.

It sounds hard on an OD and makes me think I baby mine a bit much, which I
will continue to do because I don't want to rebuild my OD, ever, something
racing owners do all the time.

Could you talk about it a bit more? How is it used on the track? When/How do
you shift in/out of OD? What's the though about cornering with the OD,
in/out/depends?

Greg

--- On Fri, 11/5/10, PG <britishcars at shaw.ca> wrote:

> From: PG <britishcars at shaw.ca>
> Subject: Re: [Healeys] Rich ?   overdrive
> To: "'Mark LaPierre'" <lapierrem at sbcglobal.net>, "'Rich Chrysler'"
<richchrysler at quickclic.net>, "'Herbert Miller'" <hgmiller3 at qwest.net>,
healeys at autox.team.net
> Date: Friday, November 5, 2010, 1:43 AM
> I'm not sure if the overdrive
> throttle switch was for preservation of the
> overdrive or for a more comfortable drive.
>
> When I rebuilt my overdrive, I put an oversized competition
> accumulator
> piston for a faster more positive shift and removed the
> throttle switch for
> more control......works well in competition. However, it
> does give a very
> "jerky" shift.
>
> To alleviate the "jerky" feeling, I sometimes depress the
> clutch when
> shifting up or down (with a throttle blip).
>
> Works cars did not have the throttle switch.
>
> paul
>
> -----Original Message-----
> From: healeys-bounces at autox.team.net
> [mailto:healeys-bounces at autox.team.net]
> On Behalf Of Mark LaPierre
> Sent: Thursday, November 04, 2010 7:21 PM
> To: Rich Chrysler; 'Herbert Miller'; healeys at autox.team.net
> Subject: Re: [Healeys] Rich ? overdrive
>
> Rich,  What about the later MGB  boxes with the
> LH overdrive.   To your
> knowledge were the gears a different type and more durable
> cause I know
> those didn't use any type of throttle switch when
> changing  out of OD?  I've
>
> always been very curious about that since I've owned my
> Healey.
>
>  And the real beauty with the LH was that you didn't have
> to adjust the
> frigin solenoid
> to make it work ,,,,,,sometimes.
>
>
>
> Mark
>
> ----- Original Message -----
> From: "Rich Chrysler" <richchrysler at quickclic.net>
> To: "'Herbert Miller'" <hgmiller3 at qwest.net>;
> <healeys at autox.team.net>
> Sent: Thursday, November 04, 2010 5:34 PM
> Subject: Re: [Healeys] overdrive
>
>
> > The workshop manual describes it nicely. The throttle
> switch (when set
> > correctly) requires the driver not only to turn the
> o/d switch off, but
> > also
> > to increase the revs to be able to drop the overdrive
> unit out of
> > engagement. This increase in engine speed meets the
> downshift out of
> > overdrive smoothly instead of shocking the entire
> drive line as it drops
> > back to normal.
> > Early MGB's used a vacuum switch for the same
> purpose.
> >
> > Rich
> >
> > /Manage: