classic motorcycle forum

Motorcycle Discussions => Identify these bikes! => Topic started by: VintageBike on October 22, 2008, 06:53:57 PM

Title: What is this sidevalve barrel?
Post by: VintageBike on October 22, 2008, 06:53:57 PM

Can anyone help me identify this NOS barrel from my garage?

No part numbers to help us....

Title: Re: What is this sidevalve barrel?
Post by: VintageBike on October 22, 2008, 06:54:28 PM

..

Title: Re: What is this sidevalve barrel?
Post by: 33d6 on October 22, 2008, 11:37:36 PM

The inlet port appears to slope downward. If so it is probably either the front barrel off a vee twin or the barrel from a 'sloper' single.
The sloper fashion was started by BSA in the late 20's and the cast in valve chest as used on this barrel was a late 20's innovation also.
BSA liked to use that style of valve cap rather than the fircone style used by other makers.
BSA made both vee-twins and sloper singles using this style of barrel so I lean towards it being BSA.
I'll be interested to know what it is if you get a firm identification.
Cheers,

Title: Re: What is this sidevalve barrel?
Post by: m3bobby on October 23, 2008, 01:29:09 PM

This is a difficult one, I dont know of any manufactures who made a barrel with integral head and a timing chest cover. And its a 2 screw cover rather than the single point fixing of most manufactures.

I had a look at various 1920-30's BSA sidevalve engines and nearly all had BSA cast into the barrell.

I'm wundering if this could be a barrell from a stationary engine or similar?