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Camshaft Identification
https://ausmini.com/forums/viewtopic.php?f=2&t=99344		 Page 1 of 2
Author:  cooperess [ Mon Sep 23, 2019 6:47 pm ]
Post subject:  Camshaft Identification
I am rebuilding a Mk2 1275 Cooper S engine.
Can anyone help with identifying the camshaft pictured below. It has 1/2" lobes. There are no numbers anywhere to be seen.
Attachment:
Mini Camshaft (3).JPG
Attachment:
Mini Camshaft (2).JPG
Attachment:
Mini Camshaft (1).JPG
Author:  gtogreen1969 [ Mon Sep 23, 2019 7:18 pm ]
Post subject:  Re: Camshaft Identification
Does it have any raised rings between lobes 1 & 2?
Author:  cooperess [ Mon Sep 23, 2019 10:07 pm ]
Post subject:  Re: Camshaft Identification
gtogreen1969 wrote:
Does it have any raised rings between lobes 1 & 2?

No raised rings anywhere.
Author:  TK [ Tue Sep 24, 2019 7:10 am ]
Post subject:  Re: Camshaft Identification
1100S
Author:  cooperess [ Tue Sep 24, 2019 11:42 am ]
Post subject:  Re: Camshaft Identification
If it is an 1100S camshaft, how do I check that the cam lobes are suitable for the Mk2 motor.
Author:  drmini in aust [ Tue Sep 24, 2019 12:14 pm ]
Post subject:  Re: Camshaft Identification
cooperess wrote:
If it is an 1100S camshaft, how do I check that the cam lobes are suitable for the Mk2 motor.

It looks like it needs refreshing, I would get Graham Russell to regrind it to his 'S' grind. Or similar, eg. his 266SS if you want sportier..
Author:  cooperess [ Tue Sep 24, 2019 1:46 pm ]
Post subject:  Re: Camshaft Identification
How can I find out if this camshaft has already been taken to Cooper S or any other specifications.
Author:  TK [ Tue Sep 24, 2019 4:25 pm ]
Post subject:  Re: Camshaft Identification
take it to a cam grinder. they will tell you the spec
Author:  low n blown [ Wed Sep 25, 2019 10:04 am ]
Post subject:  Re: Camshaft Identification
Having it profiled will cost almost as much as a regrind. If you want a genuine S cam I will have one here.
Author:  cooperess [ Thu Sep 26, 2019 4:39 pm ]
Post subject:  Re: Camshaft Identification
If I use a dial gauge on lobes, and measure the lift, will that help ID the camshaft?
Author:  GR [ Thu Sep 26, 2019 6:27 pm ]
Post subject:  Re: Camshaft Identification
Hi Cooperess
If you measure the overall height of the lobe and compare it with a a std lobe that will tell you if it has been reground or not.
The MK2 S, 1100 S, 1275 sprite and other BMC engines had the same grind, if you are going to rebuild the engine why would you not get it reground?
PS the MK1 grind is a much better grind.
Graham Russell
Author:  cooperess [ Fri Sep 27, 2019 9:26 am ]
Post subject:  Re: Camshaft Identification
GR wrote:
Hi Cooperess
If you measure the overall height of the lobe and compare it with a a std lobe that will tell you if it has been reground or not.
The MK2 S, 1100 S, 1275 sprite and other BMC engines had the same grind, if you are going to rebuild the engine why would you not get it reground?
PS the MK1 grind is a much better grind.
Graham Russell

Thanks Graham, I am rebuilding the engine because I bought it from an 80 odd year old who said he had rebuilt it and never ran it. The camshaft looks like it has never been used and the bearings look new, so don't I need to know the camshaft ID in order get the timing right?
Author:  Stibbsy [ Fri Sep 27, 2019 10:28 am ]
Post subject:  Re: Camshaft Identification
GR wrote:
The MK2 S, 1100 S, 1275 sprite and other BMC engines had the same grind,

That's good to know. My Mk2 also has an 1100S cam. With 73mm bore and 1 3/16" exhausts and still running the 1 1/4" SU's. The only change I made when doing the engine was fit 1.5 ratio roller rockers.
It revs well and quite nippy.
Author:  GR [ Fri Sep 27, 2019 8:09 pm ]
Post subject:  Re: Camshaft Identification
Hi cooperess
You don't need to know what cam it is to set it up,you can set it up by splitting the over lap at top dead centre by that i mean when the exhaust valve is closing the inlet valve is opening at TDC.
Just put 2 push rods in, one on number one exhaust and one on number one inlet put a dial indicator on the inlet and measure how far the inlet is open at TDC.
With out moving the motor move the dial indicator across to the exhaust pushrod set it on zero then turn the motor till the indicator stops this will tell you how far the exhaust valve is open at TDC, I like to set it up with the inlet open .010 tho more than the exhaust this will work fine.
See how easy it is clear as mud :D give it a go.
Graham Russell
Author:  cooperess [ Fri Sep 27, 2019 10:31 pm ]
Post subject:  Re: Camshaft Identification
As I only have a metric dial indicator I guess the reading would be 0.254mm.
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