[Healeys] Camshaft differences

[Chris Dimmock]

And here's a picture. 
Pic the wrong one out. 

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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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