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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@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@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@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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--001a1143ff346b2cc0052b4cb171
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">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.=C2=A0 <br>In the photo that I see, the cams =
are placed from left to right - not top to bottom. Starting with the far le=
ft 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 appear=
s to have 3 grooves ... if that makes it a 2 ring cam then it is also a 100=
-6 cam.<br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Mon, Feb 8, 2016 at 3:16 AM, Chris Dimmock <span dir=3D"ltr"><<a href=
=3D"mailto:austin.healey@gmail.com"; target=3D"_blank">austin.healey@gmail.c=
om</a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">And here's a=
picture.<br>
Pic the wrong one out.<br>
<br>
<br><br>
Sent from my iPhone<br>
<br>
> On 8 Feb 2016, at 10:07 PM, Chris Dimmock <<a href=3D"mailto:austin=
.healey@gmail.com">austin.healey@gmail.com</a>> wrote:<br>
><br>
> Andy.<br>
> There are 2 gear drives on a camshaft.<br>
> One for the distributor.<br>
> One for the oil pump.<br>
> The drive for the distributor was always the same number of teeth.<br>
> Always on a C series engine. Same same same.<br>
> Oil pump? That's different.<br>
> Same size gear for both?<br>
> No. Smaller? That's early<br>
> Bigger gear for oil pump?<br>
> That's later. Bigger gear.<br>
> That's the one I'll be using.<br>
> Your pic tells me nothing.<br>
> All c series engines have identical distributor drive gears.<br>
> Don't try to identify anything by 50 year old ridges or grooves.<b=
r>
> Or do. Your call.<br>
><br>
> Sent from my iPhone<br>
><br>
>> On 8 Feb 2016, at 6:21 PM, Andy Thorp <<a href=3D"mailto:bce257=
@yahoo.co.nz">bce257@yahoo.co.nz</a>> wrote:<br>
>><br>
>> Hi Guys,<br>
>><br>
>> A while ago I read that there is a difference in early and later e=
ngines in that the cam has 13 vs 12 teeth on the gear that drives the oil p=
ump. This supposedly coincided with the change from a lobe type to a gear t=
ype oil pump.<br>
>><br>
>> I have a mid 57 BN4, a late 57 Austin A105 sedan, an BJ8 engine an=
d 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 betwe=
en #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.<br>
>><br>
>> Can anyone decode the ridges on the cam?<br>
>><br>
>> Andy.<br>
>> <DSC00888.JPG><br>
>> _______________________________________________<br>
>> Support Team.Net <a href=3D"http://www.team.net/donate.html"; rel=
=3D"noreferrer" target=3D"_blank">http://www.team.net/donate.html</a><br>
>> Suggested annual donation=C2=A0 $12.75<br>
>> Archive: <a href=3D"http://www.team.net/archive"; rel=3D"noreferrer=
" target=3D"_blank">http://www.team.net/archive</a><br>
>> Forums: <a href=3D"http://www.team.net/forums"; rel=3D"noreferrer" =
target=3D"_blank">http://www.team.net/forums</a><br>
>><br>
>> <a href=3D"mailto:Healeys@autox.team.net";>Healeys@autox.team.net</=
a><br>
>> <a href=3D"http://autox.team.net/mailman/listinfo/healeys"; rel=3D"=
noreferrer" target=3D"_blank">http://autox.team.net/mailman/listinfo/healey=
s</a><br>
>><br>
>> Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/optio=
ns/healeys/austin.healey@gmail.com" rel=3D"noreferrer" target=3D"_blank">ht=
tp://autox.team.net/mailman/options/healeys/austin.healey@gmail.com</a><br>
>><br>
<br>_______________________________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
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<br>
<br></blockquote></div><br></div>
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