[Healeys] OD in 2nd gear

[m.g.sharp at sympatico.ca]

I always understood that the OD was locked out of the lower gears as the torque generated in 1st and 2nd was higher than the OD could cope with over a reasonable service period, i.e., made it more prone to breaking and reduced its longevity.  Given the cost and increasingly rarity of the bits to rebuild an OD, I would not do it.  In any case the purpose of the OD was to drop the revs at cruising speeds (i.e. in 3rd and 4th) to improve gas mileage and reduce revs on the motor, thus increasing engine longevity, One was not meant to go up  through all six ratios when accelerating,  Thus the throttle switch to drop it out of OD when overtaking.

 

IMHO, I’d respectfully suggest if one were trying to knock a few tenths of the 0-60 time, fit a modern 5 speed box from something.

 

Mirek 

 

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Roger Grace
Sent: January 24, 2021 8:37 PM
To: Healeys <healeys at autox.team.net>
Subject: [Healeys] OD in 2nd gear

 

For interest, see enclosed my Winter project to install interlocks using proximity sensors to enable OD on 2nd.gear. Now road tested and works OK.

See some notes about the project and also photos embedded in the dox.

rg

 


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