The problem with Herald or Spitfire type halfshafts is the left hand nut is
self loosening, and will probably be made worse on a normal clockwise track.
After reassembly of a hub onto a shaft the nut must be retorqued a few times
over some miles otherwise it will work loose and then the end of the shaft
shears off with fretting. We had two LH failures on the London to Cape Town
rally Vittesse, both fractures started at the small nick in the shaft to
stop the woodruff key going too far - but these shafts will never break from
this point with an old shaft where the hub is locked on solid.
John Kipping
----- Original Message -----
From: "Jari Tabell" <jari.tabell@pp.inet.fi>
To: "John Kipping" <johnkipping@inet.net.nz>
Cc: "Tom Strange" <tstrange@new.rr.com>; <fot@autox.team.net>
Sent: Wednesday, July 31, 2002 7:00 AM
Subject: Re: axel conversion
> I guess that the problem are the halfshafts. After...
>
> http://personal.inet.fi/koti/jtabell/bo99race.htm
> and
> http://personal.inet.fi/koti/jtabell/bo00race.htm
> and
> http://personal.inet.fi/koti/jtabell/rr014.htm
>
> ... I have ended up to the final (I hope so...) solution like this:
>
> http://personal.inet.fi/koti/jtabell/shaft1.JPG
> http://personal.inet.fi/koti/jtabell/shaft4.JPG
> http://personal.inet.fi/koti/jtabell/shaft6.JPG
>
> I hope that these pictures give some ideas. My own conclusion is that the
> initial design of the tapered fitting of the flange is just bad and either
the
> strength of the original ouput flange itself is no good for racing either.
This
> latest solution includes billet type solid shrink fitted flanges and
halfshafts
> of a bit larger diameter. These have lasted now at least 2 races...
>
> Regards
> Jari
> http://personal.inet.fi/koti/jtabell/
>
> PS. In racing use the original halfshafts _will_ break, sooner or later...
>
>
>
>
> John Kipping wrote:
>
> > It all depends which bit of the rear suspension you are having problems
with
> > as to how best to cure it. Differentials can be constructed from better
> > parts and there are reasons why halfshafts break.
> > John Kipping
> > ----- Original Message -----
> > From: "Tom Strange" <tstrange@new.rr.com>
> > To: <fot@autox.team.net>
> > Sent: Tuesday, July 30, 2002 2:54 AM
> > Subject: axel conversion
> >
> > > I have just recieved a request from Steve Adams (#55 spit from england
> > that
> > > raced with us at mid ohio)..... he is looking for info on an upgrade
for
> > the
> > > rear spit axel.... seems he is making a habbit of losing them.
> > > I am not happy with what I have on my late model spit either. If
anyone
> > has
> > > info on this (similar to the southwick conversion maybe???) please let
me
> > know
> > > & I will forward it on to Steve or you can email him directly at
> > > steve@fbracing.fsn.co.uk
> > > Thanks in advance for any help....
> > > Tom
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