flat tank sizes

Information relating to Matchless and AJS Models built prior to 1939
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flat tank sizes

Postby tom reid » Mon Sep 10, 2018 9:58 am

Hi All
I am about to have a tank made for what I believe is a 24 OHV.
I have access to another 24 and have found this frame has a longer tank that would not fit in my frame.

My frame number is 40391.

Can anyone shed some light why this would be different and is there any measurements or patterns I can use in existence.
My only other option is to use the longer tank as a model and shorten it as required.

My preference is to make this project as close to original specs as possible.

I welcome any advise received with thanks.

Regards
Tom

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Re: flat tank sizes

Postby Rob Harknett » Mon Sep 10, 2018 11:35 am

40391 is a frame number for a 1924 model B3 350 OHV. I would need the other frame number which has the longer tank to tell you the year and model. However, you will not gain much by knowing this, as the tank is too long. So this frame is probably for a 500 or v twin. Which had a longer tank. Tanks did vary even on the 350's, year and model, see attached from 1921/26 350 parts list pictures.
Ashampoo_Snap_2018.09.10_12h10m53s_001_.png

Attached below will give you some idea of the B3 tank you need, note the shape and position of tank caps and oil pump, for easy clues to spot.
Ashampoo_Snap_2018.09.10_12h26m42s_003_.png

You may like to join the prewar e-group. This will put you in touch with other owners who may have had tanks made etc. You can contact me direct via prewar@jampot.com I could activate the group website to send an invite to join the group, to your e-mail address. This would make the application to join procedure easier, as I would have already given my approval for you to join the e-group.
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Re: flat tank sizes

Postby tom reid » Tue Sep 11, 2018 2:08 am

Thank you Rob I really appreciate your assistance
I believe I am already a member of the e group. I thought this was the forum how I put out an email to it.

I will try to establish the correct measurements, this has been difficult because I cannot source the correct tank in Perth.

I will send an email through the pre-war.

Regards
Tom Reid

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Re: flat tank sizes

Postby SPRIDDLER » Tue Sep 11, 2018 2:12 pm

Here's the tank and top frame on a pal's 350cc 1927 H4 if it helps to give you a clue.......

CIMG4528 (640x480) (2).jpg


CIMG4531 (640x480).jpg
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Re: flat tank sizes

Postby tom reid » Wed Sep 12, 2018 12:36 am

Thank you
This helps a lot.
When I get this work done is there anything I can do to record the information for future use.
Regards
Tom

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Re: flat tank sizes

Postby tom reid » Sun Sep 16, 2018 3:00 am

Hi Rob
I now have a tank sample that look like someone has re-engineered.
Can you tell me how I can upload an image

Regards
Tom

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Re: flat tank sizes

Postby Eamonn » Sun Sep 16, 2018 7:56 am

tom reid wrote:Can you tell me how I can upload an image


Follow the instructions in this link:
http://www.jampot.com/forum/viewtopic.php?f=53&t=12424


(If you're referring to the pre-war eGroup, Rob will advise on that method)

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Re: flat tank sizes

Postby Rob Harknett » Sun Sep 16, 2018 11:44 am

tom reid wrote:Hi Rob
I now have a tank sample that look like someone has re-engineered.
Can you tell me how I can upload an image

Regards
Tom

Not sure if I have lost the plot, I thought you wanted a tank for a 1924 B3 frame, This tank is nothing like 1927 H4, which is clearly seen by the position of the filler caps and oil pump. 1927 all three are on the left. Not so with 1924. Of cause there are other differences, Look at the tanks on the 1924 bikes here. http://archives.jampot.dk/promotional/S ... alogue.pdf

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Re: flat tank sizes

Postby tom reid » Sun Sep 23, 2018 12:15 pm

You haven't lost the plot.
24 B3 is correct I will try and upload these photos.
Tom

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