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PostPosted: Sun Apr 14, 2019 11:53 am 
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848cc
848cc

Joined: Sun Mar 16, 2014 11:01 am
Posts: 370
Location: TOWNSVILLE NQ
Can the experts on here clarify something for me? Are all 'S' cam oil pump drives peg drive?
My Mk2 has a star drive and have been told that mine is probably an 1100S cam.
There is currently a star drive cam on eBay stating that it is a Cooper S cam.


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PostPosted: Sun Apr 14, 2019 1:04 pm 
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Joined: Wed Sep 08, 2004 9:27 pm
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Location: Wodonga - Vic/NSW border
yeah, should be a peg/pin drive, but it doesn't matter what type of drive the cam has, it's the way it's been ground. Likely your engine has been rebuilt, someone took an 1100S camshaft and had someone grind some hot profile into it. Often the grinder needs a cam with a bit more meat on it, so they use a cam with a milder profile as a starting point.

Are there any numbers engraved into either end of the cam?

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PostPosted: Sun Apr 14, 2019 2:46 pm 
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848cc
848cc

Joined: Sun Mar 16, 2014 11:01 am
Posts: 370
Location: TOWNSVILLE NQ
Don't know about any numbers as it is now in the engine and running.
Before it was stripped down, engine always run very smooth. I discovered it has 73mm bore. Big ends & mains all std. Head has 1 3/16" exhaust and runs 1 1/4" SU's.
Now running 1.5 roller rockers. Go quite well. Only been on the road a couple of weeks.


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PostPosted: Mon Apr 15, 2019 9:41 am 
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998cc
998cc

Joined: Wed Sep 22, 2004 5:46 pm
Posts: 697
Location: Melbourne
Originally they were all pin drive pumps.
If you fit a different cam with star or slot drive you need to drill additional holes to mount the oil pump as the bolt arrangement is different.
Pin drive pump has 3 bolts, star drive had 4 bolts and slot drive has 2 or 4??? bolts.
Looking at images for A series oil pumps there seem to be a number of different bolt arrangements for the slot drive pumps and star drive pumps.

RonR

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PostPosted: Tue Apr 16, 2019 1:15 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 38810
Location: near Baulkham Hills, NSW
Slot drive 1275 pumps all use 2 of the 4 original star drive pump's bolts.
There are also 2 Phillips head screws that hold the pump together.
Current star drive (splined shaft) pumps are also 2 bolt fixing.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Peak ignition system fitted. :mrgreen:


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