Joined: Aug 2017 Posts: 2,983 Threads: 166
Reputation:
37
Location: Sherwood Forest
Car type: 1938 Talbot Ten Airline
Not home-made, this was a standard feature; I'll leave others more technically minded to suggest its purpose!
Joined: Aug 2017 Posts: 877 Threads: 48
Reputation:
4
Location: North Wiltshire
Car type: 1927 Chummy, 1938 Big Seven 1/2 a Trials Chummy
Stops large bits going in the auxiliary air intake - Nicholson refers to the slow running arrangement as an auxiliary carburettor, he probably near the truth.
Joined: Aug 2017 Posts: 124 Threads: 15
Reputation:
0
Location: East Sussex
Thanks both for your replies.
We have 2 A7's fitted with this carb. One has a shield and the other doesn't and has not had in 8 years of ownership. Its idle speed has always been too high and I'm wondering if the open, threaded hole for attaching this shield may be the source of an air leak. I have now made a shield and fitted it. Weather has delayed road testing, but we'll give it a go today.
Alan
Joined: Aug 2017 Posts: 849 Threads: 123
Reputation:
1
I notice you have an extension on the "pin" ....I always found it a fiddle to lift it, so what a good idea...does the extra weight affect the needle valve?
Joined: Aug 2017 Posts: 1,230 Threads: 33
Reputation:
7
Location: Salop
Car type: '28 GE Cup. '28 AD Chummy '30 RL Saloon. '34 RP Saloon. Too Many toys!
is that an EGR valve Dave?
Joined: Aug 2017 Posts: 124 Threads: 15
Reputation:
0
Location: East Sussex
06-10-2021, 09:44 PM
(This post was last modified: 06-10-2021, 09:48 PM by Jack in the Box.)
David,
This was the arrangement on our AD when we acquired it. It is certainly easier to fill the float chamber for cold starting than our Box, that does not have this feature.
There will be slightly higher mass as you say, so maybe the fuel level in the carb is slightly different too.
Alan
Dave,
Please accept my apologies if I have used the incorrect designation. The carb is bronze, so should I have called the thread “22 FZ again” ?
Do you know what the shield is for?
Cheers Alan