<div dir="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. <br>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.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Feb 8, 2016 at 3:16 AM, Chris Dimmock <span dir="ltr"><<a href="mailto:austin.healey@gmail.com" target="_blank">austin.healey@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: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="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.<br>
> Or do. Your call.<br>
><br>
> Sent from my iPhone<br>
><br>
>> On 8 Feb 2016, at 6:21 PM, Andy Thorp <<a href="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 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.<br>
>><br>
>> 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.<br>
>><br>
>> Can anyone decode the ridges on the cam?<br>
>><br>
>> Andy.<br>
>> <DSC00888.JPG><br>
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