Hepolite G12/31 CSR pistons 15036 what C/R?

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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Hepolite G12/31 CSR pistons 15036 what C/R?

Postby CAB » Wed Aug 03, 2011 7:23 pm

Hello
I have seen some new old stock Hepolite +0.060 G12/31 CSR pistons for sale. The part number is W 15036/N.OV but I can't find any references that confirm that these are correct for a G12 CSR and have a 8.5:1 compression ratio.
Can anyone help?
Thanks
CAB

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Hepolite G12/31 CSR pistons 15036 what C/R?

Postby Rob Harknett » Wed Aug 03, 2011 8:12 pm

W15036 are for 1958/59 G12 CSR & are 8.5 -1 cr. Only you know if they will be OK for your engine as you did not state the year.

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Hepolite G12/31 CSR pistons 15036 what C/R?

Postby Don Madden » Wed Aug 03, 2011 8:16 pm

The Welworthy list indicates that the W15036 pistons are for the 1958/59 650cc engine. Presumably they mean fall of 1958 as there was a special model of the 1958 engine with 650cc for export. The 1960-up pistons are very different & do not interchange with prior. So there are 1958, 1959 & 1960-up 650cc engine varients, each with different pistons, barrels, heads & manifold and all not interchangable with each other. What do you have? Cheers, Don.

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Hepolite G12/31 CSR pistons 15036 what C/R?

Postby CAB » Wed Aug 03, 2011 10:02 pm

Hello
Thanks for the replies. Mine is a 1961 G12 CSR.
Regards
CAB

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Hepolite G12/31 CSR pistons 15036 what C/R?

Postby John Donne » Thu Aug 04, 2011 10:46 am

So now we all know what the famous Don Madden now looks like, after that picture was placed in this months Jampot. Nice to put a face to name.

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Hepolite G12/31 CSR pistons 15036 what C/R?

Postby Merlin » Thu Aug 04, 2011 12:00 pm

[quote]
So now we all know what the famous Don Madden now looks like, after that picture was placed in this months Jampot. Nice to put a face to name.
[/quot
Should that not read infamous
Chemists do it with test tubes

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Hepolite G12/31 CSR pistons 15036 what C/R?

Postby Don Madden » Fri Aug 05, 2011 1:49 am

Cheers, Don.

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