[Healeys] Camshaft differences

[richard mayor]

After many years of racing I became aware of the rings on the cams and I
made a few notes from time to time. After reviewing my notes I hope I can
shed some light.
In the photo that I see, the cams are placed from left to right - not top
to bottom. Starting with the far left cam - the one with no rings - I
believe to be a very late 3000 cam. This one should have a part # stamped
on the end. (I once saw a BJ7 cam with no rings and it had part #12B594
stamped on the end). The next two cams have a single ring and I believe
these are early 3000 cams. The 4th cam with a 2 rings is a 100-6 cam. The
5th cam on the far right is not clear, it appears to have 3 grooves ... if
that makes it a 2 ring cam then it is also a 100-6 cam.

On Mon, Feb 8, 2016 at 3:16 AM, Chris Dimmock <austin.healey at gmail.com>
wrote:

> And here's a picture.
> Pic the wrong one out.
>
>
>
> Sent from my iPhone
>
> > On 8 Feb 2016, at 10:07 PM, Chris Dimmock <austin.healey at gmail.com>
> wrote:
> >
> > Andy.
> > There are 2 gear drives on a camshaft.
> > One for the distributor.
> > One for the oil pump.
> > The drive for the distributor was always the same number of teeth.
> > Always on a C series engine. Same same same.
> > Oil pump? That's different.
> > Same size gear for both?
> > No. Smaller? That's early
> > Bigger gear for oil pump?
> > That's later. Bigger gear.
> > That's the one I'll be using.
> > Your pic tells me nothing.
> > All c series engines have identical distributor drive gears.
> > Don't try to identify anything by 50 year old ridges or grooves.
> > Or do. Your call.
> >
> > Sent from my iPhone
> >
> >> On 8 Feb 2016, at 6:21 PM, Andy Thorp <bce257 at yahoo.co.nz> wrote:
> >>
> >> Hi Guys,
> >>
> >> A while ago I read that there is a difference in early and later
> engines in that the cam has 13 vs 12 teeth on the gear that drives the oil
> pump. This supposedly coincided with the change from a lobe type to a gear
> type oil pump.
> >>
> >> I have a mid 57 BN4, a late 57 Austin A105 sedan, an BJ8 engine and a
> Wolseley 6/110 Mk1 cam which are all interchangeable. The only obvious
> difference is that there are different ridges or grooves in the shaft
> between #5 cylinder lobes. The BN4/sedan engines have one ridge, 3000
> engine has two ridges, 6/110 engine has three grooves, yet all of them have
> 12 teeth on the oil pump drive gear. Both the BN4 and sedan engines have a
> lobe type pump whereas the later engines have gear pumps. I have met one
> person who got caught by the different number of teeth on the gear when
> swapping a cam so the change must have been earlier on.
> >>
> >> Can anyone decode the ridges on the cam?
> >>
> >> Andy.
> >> <DSC00888.JPG>
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