10.8 mm is within the tolerance for the major diameter of an M11 thread
(Max-10.968 mm, Min-10.732 mm), so that may well be what you have.
Mike
Michael J Marr, P.E., CEng.
Albion Technical Services
W5918 Hackbarth Rd
Fort Atkinson, WI 53538
Cell: 630-202-0065
Email: mmarr@albiontechnical.com
-----Original Message-----
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Greg Gelhar
Sent: Wednesday, October 21, 2020 7:48 PM
To: 'Roger Elliott' <elliottr@rmi.net>; triumphs@autox.team.net
Subject: Re: [TR] Thread of Stromberg 175 Needle valve
A machine job shop with thread milling capabilities could do the work. No idea
what they would charge. I don't have access to a thread micrometer, so that
thread might even be M11 x 1.5 at least that size is on some charts.
-----Original Message-----
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Roger Elliott
Sent: Wednesday, October 21, 2020 3:03 PM
To: triumphs@autox.team.net
Subject: Re: [TR] Thread of Stromberg 175 Needle valve
Thanks Greg,
Sounds like finding a tap for that is out of the question.
I know I read a post somewhere about someone changing the inlet side for a
triple carb set-up, but I have not been able to find it again.
Roger
On 10/20/2020 3:52 PM, Greg Gelhar wrote:
> This could be one of those times where a manufacturer uses a
> proprietary
thread size. I measure that thread to be M10.8 x 1.5 an odd ball for
sure.
>
> Greg G,
> Osseo, MN
>
> -----Original Message-----
> From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Roger
> Elliott
> Sent: Tuesday, October 20, 2020 2:05 PM
> To: triumphs@autox.team.net
> Subject: [TR] Thread of Stromberg 175 Needle valve
>
> Hi,
> I would like to change the side that the fuel inlet comes in on a
Stromberg 175 CD-2. It looks like it will be real easy to do, but the threads
on the needle valve don't seem to match anything in my tap set.
>
> Does anybody know what the thread is on the needle valves?
>
> I know I could get a different carb body, but I am trying to avoid that.
>
> Thanks,
> Roger Elliott
>
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