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Hi Wayne, I have a 3.55/ 1 ratoi in the spiral bevel differential of my
early BN1. Mine is from an Austin Atlantic convertible, the fixed head used
a different ratio.
This was an available option for the BN1 and was supplied with a 140MPH
speedometer.
With the 28% overdrive it is an ideal combination for modern roads
providing 70 MPH cruising at under 3000 RPM.
I believe that Dennis Welsh have the crownwhell an pinion set available for
the 3.55/1 ratio.
It is a relatively easy installation if you are familiar with differential
assembly.
M
On Thu, May 9, 2019, 9:18 PM Curtis Arndt, <cnaarndt@gmail.com> wrote:
> Hi Wayne,
>
> First what do you mean by "early BN1?" If it's the Spiral Bevel rear end,
> then the standard 3.54 rear end conversion *will not work*. These will
> only work on the later BN1s with the Hypoid Bevel rear end starting at
> chassis no. 221536 in Nov. '54.
>
> That being said, maybe there is a lower gear option for the Spiral Bevel
> unit, but if there is, I'm not aware of who might supply it.
>
> BTW, my shop here in San Diego installed my Lempert 3.54 rear-end, and of
> course rebuilt the whole unit while they had the thing apart. Fortunately,
> the shop had done a number of Healey conversions and was very familiar with
> the process. BTW, I have one of the very early BN1 Hypoid rear end units
> with the filler plug on the carrier versus on the top of the pumpkin as on
> the later cars, but there was no problem.
>
> Anyone interested, I have an spare original 3.54 rear end that I picked up
> 20 years ago in Australia from my friend Rob Rowland at the Healey
> Factory. If interested, send me an email.
>
> Cheers,
>
> Curt
>
> On Wed, May 8, 2019 at 2:25 PM Wayne Schultz <waschu2@gmail.com> wrote:
>
>> Does anyone have the specifications for installing a 3:5 or so gear set
>> into an early BN-1 100-4 differential? I am looking for pinion preload and
>> ring gear lash etc.My friend with his 100-4 spends a lot of time on the
>> highway and would like to lower his rpm's at highway speeds. Denis Welch
>> has the gearset needed, just would need specs, available of shims, bearings
>> etc. I have done several conversions on Healey 3000's but the BN-1 third
>> member is a different animal
>>
>> Thanks
>> Wayne
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>> _______________________________________________
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> Suggested annual donation $12.75
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">Hi Wayne, I have a 3.55/ 1 ratoi in the spiral bevel diff=
erential of my early BN1. Mine is from an Austin Atlantic convertible, the =
fixed head used a different ratio.<div dir=3D"auto">This was an available o=
ption for the BN1 and was supplied with a 140MPH speedometer.=C2=A0</div><d=
iv dir=3D"auto">With the 28% overdrive it is an ideal combination for moder=
n roads providing 70 MPH cruising at under 3000 RPM.</div><div dir=3D"auto"=
>I believe that Dennis Welsh have the crownwhell an pinion set available fo=
r the 3.55/1 ratio.</div><div dir=3D"auto">It is a relatively easy installa=
tion if you are familiar with differential assembly.</div><div dir=3D"auto"=
><br></div><div dir=3D"auto">M</div></div><br><div class=3D"gmail_quote"><d=
iv dir=3D"ltr" class=3D"gmail_attr">On Thu, May 9, 2019, 9:18 PM Curtis Arn=
dt, <<a href=3D"mailto:cnaarndt@gmail.com";>cnaarndt@gmail.com</a>> wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi Wayne,<div=
><br></div><div>First what do you mean by "early BN1?"=C2=A0 If i=
t's the Spiral Bevel rear end, then the standard 3.54 rear end conversi=
on <u>will not work</u>.=C2=A0 These will only work on the later BN1s with =
the Hypoid Bevel rear end starting at chassis no. 221536 in Nov. '54.</=
div><div><br></div><div>That being said, maybe there is a lower gear option=
for the Spiral Bevel unit, but if there is, I'm not aware of who might=
supply it.</div><div><br></div><div>BTW, my shop here in San Diego install=
ed my Lempert 3.54 rear-end, and of course rebuilt the whole unit while the=
y had the thing apart.=C2=A0 Fortunately, the shop had done a number of Hea=
ley conversions and was very familiar with the process.=C2=A0 BTW, I have o=
ne of the very early BN1 Hypoid rear end units with the filler plug on the =
carrier versus on the top of the pumpkin as on the later cars, but there wa=
s no problem.</div><div><br></div><div>Anyone interested, I have an spare o=
riginal 3.54 rear end that I picked up 20 years ago in Australia from my fr=
iend Rob Rowland at the Healey Factory.=C2=A0 If interested, send me an ema=
il.</div><div><br></div><div>Cheers,</div><div><br></div><div>Curt</div></d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On =
Wed, May 8, 2019 at 2:25 PM Wayne Schultz <<a href=3D"mailto:waschu2@gma=
il.com" target=3D"_blank" rel=3D"noreferrer">waschu2@gmail.com</a>> wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr">Does anyone have the specifications for installing a 3:5 or so gear set=
into an early BN-1 100-4 differential? I am looking for pinion preload and=
ring gear lash etc.My friend with his 100-4 spends a lot of time on the hi=
ghway and would like to lower his rpm's at highway speeds. Denis Welch =
has the gearset needed, just would need specs, available of shims, bearings=
etc. I have done several conversions on Healey 3000's but the BN-1 thi=
rd member is a different animal<div><br></div><div>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Thanks</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Wayne=C2=A0</div></div>
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