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[Healeys] Overdrive ratios

To: "healeys@autox.team.net" <healeys@autox.team.net>
Subject: [Healeys] Overdrive ratios
From: Michael Salter <michael.salter@gmail.com>
Date: Wed, 15 Jul 2026 16:05:08 +0000
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Thread-topic: Overdrive ratios
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I have 2 BN1 overdrives which I'm struggling to identify.
Unlike the later type "A" units the serial number on these is not prefixed =
with the ratio.
The serial numbers on these are :
1260/288
and
1292/2037
Anyone with information which would help identify the ratios of these?
Thanks.



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system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
I have 2 BN1 overdrives which I'm struggling to identify.</div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
Unlike the later type &quot;A&quot; units the serial number on these is not=
 prefixed with the ratio.</div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
The serial numbers on these are :</div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
1260/288</div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
and</div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
1292/2037</div>
<div style=3D"font-family: Aptos, Aptos_MSFontService, -apple-system, Robot=
o, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(33, 33, 33);" =
dir=3D"auto">
Anyone with information which would help identify the ratios of these?</div=
>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
Thanks.</div>
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es=3D"true" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-system=
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system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt;">
<br>
</div>
</div>
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o, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(33, 33, 33);" =
id=3D"ms-outlook-mobile-signature" dir=3D"auto">
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
<br>
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</div>
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