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Albion gearbox internals
#777406 06/27/19 2:20 pm
Joined: Sep 2004
Posts: 93
Bigdook Offline OP
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Hello all,
I have a set of gears and shafts for a 4 speed Albion gearbox which I think is for a Royal Enfield.
I have checked the various on line spares manuals but cannot match up the number of gear teeth with the illustrations. All the parts look the same but the teeth count is different. It possibly a trials gear set?
This is what I have:-
Main shaft 17t,21t,26t,30t. Lay shaft 31t,27t,22t,18t.
Any ideas?
Cheers BD

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Re: Albion gearbox internals
Bigdook #777615 06/30/19 2:34 pm
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Hello BD, There is a chart for gears in Albion 'boxes in Service Bulletin #1 (reprinted by Gene Shillingford and Sons of Philadelphia, Cooper Motors of L.A. in March 1963, and the REOC in a year end publication signed by Paul and Jane, if that helps identify an edition of The Gun for folks to get their own copies.) The closest match I can find is the "H" series of gears in the older gearboxes. These are finer toothed gears that were superseded by coarser "HG" gears around 1959 as engine power increased. The counts in the list are: mainshaft 18, 21/25, 30; and layshaft 30, 27, 23, 18. The simple, straight gears seem to lend themselves to varying the tooth counts. I acquired a collection of ex-dealer spares that includes many NOS gears with oddball counts. I have no information at hand on the gear counts in the unit construction 250 Crusader series, but expect you would find that on HMC's site.

Off your topic, I note your address and will be in Kirkcaldy from mid-August to early September. I am looking for RE and old bike connections, and hoping to find some trials events to watch.
Chris Overton, Rossland, BC, Canada [email protected]

Re: Albion gearbox internals
Bigdook #777621 06/30/19 3:24 pm
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I know that the "H" series of boxes has a No. 13 box where those are exactly the same tooth counts. This box was considered a standard ratio for trials bikes.

As you may know, the gear material selected for these boxes was substandard. Hard use will break teeth.

David

Re: Albion gearbox internals
David Dunfey #777688 07/01/19 2:36 pm
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Hard use will break teeth alright, but it is hard to fault the materials used. Increasing horsepower is the culprit. The H series 'boxes came into use when hp was in the low 20's. The 'boxes and clutches stood up well. Improving fuels and engine design soon created more power, which was accommodated by using heavier teeth. Those gearboxes stood up to 750 Interceptor's 49 hp in hard racing conditions, and they stood up in Shell Thuet's Fury's. Straight cut gears are crude, and cheap, as they had to be then. Fault the choice of gear style if you like, as straight cut gears do not spread the load over several teeth.

David, do you have a catalogue or resource material for Albion gearboxes? This is the first I have heard of a No. 13, having always used the letter prefixes to the serial numbers to differentiate gearboxes.

Re: Albion gearbox internals
Chris Overton #778065 07/07/19 8:27 am
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Bigdook Offline OP
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Thanks for the info chaps. I will try and upload a photo.
I'll see if there are any classic trials events and get back to you Chris.
Cheers


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