CARB. ADAPTOR SLEEVE Thread

[pierodn]

Hi All.
Please, what is the thread of the Amal ADAPTOR SLEEVE?.
Thank you.
Piero

 

[xbacksideslider]

Piero - can you be more specific?

 

[Time Warp]

I thought it might have been the thread for the screw on adapter to a air filter rubber as in the thread on the back of an Amal.
I couldn't find my imperial micrometer but got 45.5 OD which didn't make much sense converted to inch.
The only pitch gauge that seemed to match the thread said 24G 3/16 whatever that means.

 

[L.A.B.]

I couldn't find my imperial micrometer but got 45.5 OD which didn't make much sense converted to inch.
The only pitch gauge that seemed to match the thread said 24G 3/16 whatever that means.

3/16 BSW is 24 TPI as I expect you are using a Whitworth pitch gauge so 20G is likely to be marked 1/4, and 32G is 5/32 etc. however, Amal threads can be CEI/BSC so possibly 1.8" (45.72mm) x 24 as there are 24 TPI Cycle threads and some with decimal diameters (1.29, 1.45") although the largest diameter on a CEI/BSC chart that I have found so far is 1 5/8 x 24.
https://www.motalia.com/Html/Charts/cycle_chart.html

 

[Mr. Rick]

I can't even tell which part we are talking about!
Are we discussing the exterior threads on the intake side of the Amal 932, where a velocity stack might be fitted?

 

[L.A.B.]

I can't even tell which part we are talking about!
Are we discussing the exterior threads on the intake side of the Amal 932, where a velocity stack might be fitted?

https://andover-norton.co.uk/en/shop-details/14983/carb-adaptor-sleeve

 

[dynodave]

At approx 1.809" actual, allowing for normal thread crest clearance I'd use 1-13/16 X 24 if I was going to have a custom tap made for cutting velocity stacks. Probably 60 degree. Without access to an optical comparitor anymore it would be hard to tell the angle...

 

[Mr. Rick]

Both Andover and Amal refuse to disclose this information?
Doesn't seem like it wd be a very big secret...