M2 270 Camshaft

Side valve, 803, 948, 1098., 1275 and Vizard mods
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Sleeper
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M2 270 Camshaft

Post by Sleeper »

Dear All
Just taking engine B apart and have found it's +0.060 ( I think that makes it 1330cc ? ) and has marking of M2 270 on the camshaft , does anyone know the spec of this?
Nothing in Mr Vizards book about it...

John ;-)



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Panky
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Re: M2 270 Camshaft

Post by Panky »

I think a 270 cam is considered to be a fast road cam, that's going by the Piper Cams site. Worth an extra 8 - 10 bhp apparently :D


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Re: M2 270 Camshaft

Post by Custard »

Surely not on its own!

I presume that is only with corresponding carb and exhaust changes?

If it is a Piper then the catalogue is here;

https://www.pipercams.co.uk/pdfs/2017-C ... EBSITE.pdf

And it should match this. Not sure what the M2 is though, it could possibly be the blank its machined from or denote the oil pump drive type.

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Re: M2 270 Camshaft

Post by Panky »

That was the page I was quoting from too. I guess those figures would be the maximum you can expect with the other mods you've listed plus a decent worked head head. But worth keeping it all the same.


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Re: M2 270 Camshaft

Post by Sleeper »

Thank you , but I think I'll go for a standard cam, and need to change the oil pump drive to match..

John ;-)



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Re: M2 270 Camshaft

Post by philthehill »

The 1275cc Midget, Sprite, Marina & Ital use the same camshaft and all use the spider/star drive for the oil pump so you will not have to change the oil pump.

The M stands for Magnum.



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Re: M2 270 Camshaft

Post by Sleeper »

Thank you, the camshaft I've got lined up for it is supposed to be from an Ital and is slot drive ( also P37 in the haynes manual shows slot drive ? ) ... but it's good practice ( so I've been told ) to change the oil pump at every occasion , as it pumps unfiltered oil ?

John ;-)



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Re: M2 270 Camshaft

Post by philthehill »

You are right about the oil pump in the Haynes Ital manual No: 705, it does show a slot drive oil pump.
Fitting the slot drive oil pump and respective slot drive camshaft must have been a late incorporation into the 12V engines as all the Ital and Mg Midgets engines I have stripped and rebuilt have been the star drive type oil pump Pt No: 12G2790 (Holburn Eaton) or Pt No: 12G1128 (Concentric).
The respective camshaft for the star drive is Pt No: AEG523.
My own Ital 'A' Plus block bored to 1380cc had a star drive oil pump.
Towards the end of Marina/Ital production BL were using blocks with liners and goodness knows what other parts were incorporated from other BMC vehicles with the 'A' Series engine to keep the production lines moving.
It is always best to change the oil pump as part of an engine rebuild unless the oil pump is within service limits.
Phil



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Re: M2 270 Camshaft

Post by philthehill »

Interestingly - looking at BL's Austin Morris Repair Operation Manual Supplement Pt No: AKM4580/1 Ital 1980 onwards to be used with Marina Repair Operation Manual AKM4580 the oil pump is describes as Internal gear, splined drive from camshaft. The splined drive is the spider.

I have not come across a later supplement regarding the engine specification.



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Re: M2 270 Camshaft

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..as an aside is it correct the A+ engine was only built 1980/84 and only fitted in the Ital? ( 1980-84 ).

" Marina Repair Operation Manual " ?

John ;-)



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Re: M2 270 Camshaft

Post by philthehill »

I have to admit that I have never come across a confirmed date for the introduction of the 'A' Plus engine and to what model(s) it was originally fitted to.
For more details of the 'A' Plus engine see the link below:-
https://en.wikipedia.org/wiki/BMC_A-ser ... s_versions
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Re: M2 270 Camshaft

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From the FMM site..

" Re: Ital Marina 1275 A+ engines..
Unread post by locost_bryan » Fri Jun 25, 2021 2:28 am

Good point, Kilroy, although the Marina never had the A+, as it was officially launched in the Ital in 1980.

This Ital ad mentions stellite faced valves, twin manifold exhaust, viscous coupled fan, and an award-winning temperature-controlled air intake. "

John ;-)



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