Burman gearbox AP

[Kuutiopää]

Hi,

Anyone knows which marque/s used this 4-speed Burman gearbox model AP? Thanks!

https://cybermotorcycle.com/gallery/burman/Burman-Type-AP.htm

[R]

You have such a box ?
The NMC has a spares list for it, dated 1933 as a hand change box,
so that would narrow the field down a bit ?

http://www.nationalmotorcyclemuseum.co.uk/product/burman-gboxes-1933-illustrated-spares-type-ap-gearbox-and-clutch-hand-change-only-overhead-pivot-lug-burman955f/

There are a heck of a lot of types listed also at that link you used,
and they don't even have the common 3 speed of the 1920s.

[Kuutiopää]

Thanks for the link. I think I have seen that spares list somewhere in an internet.

I have not found any photos of any motorcycle with such a gearbox.

I do have such a gearbox.

[R]

Could your Dunelt have used it ?
Can you use it on your Dunelt. ?

If there is so little info on it, no-one can argue about it "not being right" !

[john.k]

I have never seen or heard of one.....but .logically ,it is the first of the "new" series Burmans from 1930 onwards,the missing "A" from the B,and C lineup......incidentally the P means pivoted mount ,a patent of Walter Moore,while he was at Norton......BSA first infringed the patent,deeming it "fraudulent",then losing that argument,worked around it ,the first BSA having a Moore pivot was the SA  A7/10 of 1954,long after the patent expired.

[Kuutiopää]

Thanks for input guys.

The Dunelt T had Sturmey, two stud bottom fitting. I have an Albion 4-speed 2-stud bottom fitting, which Im going to use, if I dont find a frame and then
correct Sturmey gearbox.

I still have not found any photo of any bike with Burman AP gearbox.

[john.k]

On the size of the casing,I dont see 4 speeds fitting inside......more like a 3 speed...........They made a lot of different boxes ........one time I had a big Burman 3 speed F&R,from a shunting locomotive,engine was a Ruston 4 VPH,which is a pretty big engine...........incidentally,the last manager of Burman is still living in Birmingham,and is trustee of the Burman Trust.......but I dont think they give out money to sick and ailing gearboxes............the family were quite prominent in the University of Birmingham.

[vintage_keith]

Definitely a 4 speed hand change box, fitted to New Hudson, Calthorpe and OK Supreme.
You can see a Calthorpe fitted with one at: https://www.youtube.com/watch?v=T3_XfC19FSc