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Post by oxfordshirejohn on Aug 20, 2020 16:36:39 GMT
I have at last got my Wall Auto-Wheel registered - done at the same time as my Cucciolo. Can legally ride it on the public road now, not sure I would want to in today's modern traffic, but the option is there. More to the point I can also apply for a "pioneer certificate" from the Sunbeam M/C it being just old enough being made in 1914, will report back when (if) successful. You can if interested read all about how it came to be put together here :- www.britbike.com/forums/ubbthreads.php/topics/587663/wall-auto-wheel-yes-it-is-a-bsa#Post587663 |
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Post by oxfordshirejohn on Aug 28, 2020 12:45:18 GMT
Can anyone hear tell me the bore and stroke of a Wall Auto-Wheel engine? A search of the net failed come up with an answer, in fact some web sites couldn't even agree on it's capacity (in cc). Thanks.
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Post by JamesCentral on Aug 28, 2020 13:50:39 GMT
Can't you just measure it? You could measure the stroke without dismantling anything by using a length of stiff wire through the priming tap.
Then, as the capacity is 7.2 cu.in. (118cc), you can calculate the bore. In an engine of this age the dimensions are going to be some convenient number of inches & fractions.
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Post by matthew on Aug 30, 2020 11:18:39 GMT
1910 The Wall Auto Wheel appeared as an attachment that fitted to the right side of a bicycle rear wheel. It incorporated a 1.75 two-stroke engine with a Bosch magneto. The mudguard was formed to act as the petrol and oil tanks, and two flexible clamps secured the wheel to the bicycle and acted as crude shock-absorbers.
1911 The Auto Wheel now had a 110cc flat-twin two-stroke engine, with a vertical crankshaft and magneto above, and flywheel below the crankcase. A spiral gear appeared and this was followed by a bevel gear.
1912 The final form of the design was produced, with a vertically mounted 1hp four-stroke engine.
1914 As the unit was reputedly made for A. W. Wall by BSA, some were sold as the BSA auto wheel de luxe, and one was fitted between the rear wheels of a tricyle.
1920 At least three firms were using the unit as the motive power in the manner of the early Singer.
1921 Late that year the Auto-Wheel Motorette appeared with the rear wheel powered. It was sold by Gamages of London as the Dyson Motorette.
1922 The Auto Wheel was no longer listed after that year.
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Post by matthew on Aug 30, 2020 11:20:07 GMT
Sadly no information about bore and stroke
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Post by oxfordshirejohn on Aug 31, 2020 11:29:28 GMT
Thank you Matthew, your second link did in fact provide the answer - Bore & Stroke 52.5mm x 54mm. The info was buried in an article about The Silva Scooter, a devise that made use of the Wall engine. 54 x 52.5 equates to 117cc a figure often quoted in some web sites as well 118cc in others. This figure compares well my calculated figure of 54 x 52.44 so I am happy to go along with this. Attachments:
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Post by oxfordshirejohn on Sept 2, 2020 16:23:02 GMT
Update on the bore and stroke. Today I received from the NMM a photo copy the Wall Sales Catalogue which tells me that the bore & stroke are 2 1/8" x 2 1/8" which comes out to volume of 7.54 cu. ins. One wonders if there was not a certain amount of "rounding up" for the benefit of advertising copy. On the other hand the catalogue is for the earlier model, the one with long curved exhaust pipe, as opposed to mine, the later model - made by BSA - which has the exhaust box formed in the crankcase next to the front engine mount. Just as a thought, I wonder what the Advertising Standard Agency of today would think of the "glowing" terms and descriptions contained within the catalogue.
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Post by JamesCentral on Sept 2, 2020 16:48:02 GMT
How were motor cycles taxed in 1914? Cars were taxed on their RAC rating, rounded down to the nearest HP, and the RAC rating is calculated on the bore, ignoring the stroke. I know motor cycle ratings were quoted to 1/4HP, were they taxed to the nearest 1/4HP? Reducing the bore from 2-1/8" to 2-1/16" would drop the rating from 1-3/4HP to 1-1/2HP so it could be they reduced the bore on later models for that reason.
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Post by oxfordshirejohn on Mar 4, 2021 10:38:50 GMT
With the clubs assistance I was able to have my Wall-Autowheel registered - Thank you. I can now record that the Sunbeam M/C have now issued a Pioneer Certificate, could in theory ride in the Brighton Pioneer Run. Although I think that would evolve rather more peddling that I think I'm up to.
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