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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.
=20
IMHO, I=E2=80=99d respectfully suggest if one were trying to knock a few =
tenths of the 0-60 time, fit a modern 5 speed box from something.
=20
Mirek=20
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Roger Grace
Sent: January 24, 2021 8:37 PM
To: Healeys <healeys@autox.team.net>
Subject: [Healeys] OD in 2nd gear
=20
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
=20
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vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>I always understood that the OD was =
locked out of the lower gears as the torque generated in 1<sup>st</sup> =
and 2<sup>nd</sup> 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.=C2=A0 Given the cost and increasingly rarity of =
the bits to rebuild an OD, I would not do it.=C2=A0 In any case the =
purpose of the OD was to drop the revs at cruising speeds (i.e. in =
3<sup>rd</sup> and 4<sup>th</sup>) to improve gas mileage and reduce =
revs on the motor, thus increasing engine longevity, One was not meant =
to go up=C2=A0 through all six ratios when accelerating,=C2=A0 Thus the =
throttle switch to drop it out of OD when =
overtaking.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>IMHO, =
I=E2=80=99d respectfully suggest if one were trying to knock a few =
tenths of the 0-60 time, fit a modern 5 speed box from =
something.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Mirek =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Roger =
Grace<br><b>Sent:</b> January 24, 2021 8:37 PM<br><b>To:</b> Healeys =
<healeys@autox.team.net><br><b>Subject:</b> [Healeys] OD in 2nd =
gear<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal>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.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>See some notes about the project and also photos =
embedded in the dox.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>rg<o:p></o:p></p></div><div =
id=3D"m_1923197911117131538DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><p =
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