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Unrecorded engine number

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Trying to understand engine number

Posted by christian_wyss at November 30. 2018

Hello,

Recently saw an unknown engine number, even in the records. Engine is a Manx or Inter and have this number G10T 45XXX.

Does somebody knows what the T stands for?

Thanks

Christian

Re: Unrecorded engine number

Posted by christian_wyss at November 30. 2018

... Well after a nice phone call with Stu Rogers, he told me that it just stands for Trial and the only difference with a road or race bike would be a low compression piston.

 

Christian

Re: Unrecorded engine number

Posted by richard_cornish at November 30. 2018

Hi Christian,

   The letters and numbers are G = 1952, 10 = 350cc International, T = trials. I think there were some special ISDT featherbed works machines built that year, so it could possibly be one of those or could be a one-off for a favoured rider or dealer. This engine would possibly have milder cams for low speed torque, perhaps to the CJ profiles.

Regards,  Richard. 

Re: Unrecorded engine number

Posted by roger_deadman at December 01. 2018

Hi Christian

I have been looking through a letter from Peter Roydhouse ,i cant find a G10 T but for 1953 there is a H10 T which refers to a 350 ohc ISDT sidecar outfit i hope this is of interest

Regards Roger

Re: Unrecorded engine number

Posted by christian_wyss at December 01. 2018

Hi Richard and Roger,

Thank you for your inputs. It's always interesting to talk with passionate people.

I got some new stuff from Michael Rettie, in fact Norton records data sheet.

I found the H10T in it.

 

And just as you Roger, no G10T.

 

But, might be a bug in those records, because for a 1951 500T stamped F3T, the records shows G3T.

 

What do you think about that?

 

Regards,

Christian

Attachments

Re: Unrecorded engine number

Posted by richard_payne at December 01. 2018

The beginning of September, after the works returned from the summer break was traditionally the point where production of the following year's models started. It's not hard to imagine that a clerk who had started writing 'G' slipped up when a special build that had been held up in the comp shop came along the line.

Prior to WW2, when frame and engine numbers were not matched, spare engines were taken from stock and bore a number from the sequence in the engine book. However, with the matched post-war numbers, this cannot have been the case.

I think that you have to  submit the engine number to the NOC and ask what details the factory records show for it. Dealer and other specifications may give a clue as to whether it had a 'T' originally.

Re: Unrecorded engine number

Posted by christian_wyss at December 01. 2018

OK, thanks for that.

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