[Healeys] Healey BN-1 rear

Fri May 10 07:07:33 MDT 2019

Agreed. Absolutely. I’ve a 3:54 in my diff & a 28% OD. Does improve comfort of cruising…sometimes one has to go a long way/time on an autoroute/motorway/autobahn etc.

Simon

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Michael Salter
Sent: 10 May 2019 13:16
To: michaelsalter at gmail.com
Cc: healeys at autox.team.net; Wayne Schultz <waschu2 at gmail.com>
Subject: Re: [Healeys] Healey BN-1 rear

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 at gmail.com <mailto:cnaarndt at 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 at gmail.com <mailto:waschu2 at 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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