Part identification

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ianstephens
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Part identification

Postby ianstephens » Thu Feb 09, 2017 1:39 pm

Hello

I recently brought a 1934 LH Red Hunter 250cc which came complete with a 'box of spare bits'!

In there is what appears to be a new old stock (unused) bronze cylinder head. I am trying to identify whether this type would ever have been fitted to my bike but haven't been able to find any information. It is stamped with the part number A7391JSB and wondered if anyone can help!

Many thanks

Ian

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Leejm
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Re: Part identification

Postby Leejm » Thu Feb 09, 2017 3:28 pm

I do know ariel offered bronze heads for competition riders in the 1930's. Better cooling and higher compression can be used. I don't know about parts numbers. But bronze heads are rare! I would use it if I had.
1948 NH, BSA D10 SPORTS. 1953 VHA (project)

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adrie.degraaff
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Re: Part identification

Postby adrie.degraaff » Thu Feb 09, 2017 5:07 pm

I think A7 is a 500 head, these where made for competition only.

ianstephens
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Re: Part identification

Postby ianstephens » Mon Feb 13, 2017 6:53 pm

Hi All. Many thanks for all of the information so far, I thought I would attach a couple of photos to see if this helps. I believe it is a 250 head and wondered if anyone knows when/if these might have been made/fitted to my bike?

Many thanks for all of your help and advice.

Ian
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IMG_1039.JPG
IMG_1036.JPG
IMG_1031.JPG

ianstephens
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Re: Part identification

Postby ianstephens » Fri Feb 17, 2017 10:30 am

Well, mystery solved. It seems that it's a copper coated iron 250cc head!

Many thanks to everyone for all of your help and advice.

Ian

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paul.jameson
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Re: Part identification

Postby paul.jameson » Fri Feb 17, 2017 6:16 pm

A7 / 391 is the drawing number for a 1933 250cc head. For 1934 the drawing number is A7 / 391A. So what the JSB means I have no idea!
Paul Jameson
36 4G, 37 VH, 53 ex ISDT KHA (project), 54 KH(A), 54 4G Mk IV (project), Healey 1000/4 (project)
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser.

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Re: Part identification

Postby nevhunter » Fri Feb 17, 2017 9:35 pm

IF it was bronze, it would be weighty. I reckon it's a gold coloured engine paint, rather than plating. It's hard to get plating down the base of the fins unless it's done electroless or by a special current pulsing and reversing technique. Nev

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Re: Part identification

Postby Mike Nash » Sat Feb 18, 2017 8:04 am

Is it magnetic? MikeN.

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Re: Part identification

Postby ianstephens » Mon Feb 20, 2017 1:27 pm

Hi All

Many thanks for all of your responses, really helpful.

It is magnetic which I guess proves that sadly it isn't bronz, but at least it was made at the same time as my bike so will serve as a good spare.

It is hard to tell whether it has been plated or painted but when I look at it very closely I think it may have been plated to look like bronze.

Cheers

Ian


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