Stromberg Temperature Valves

Talk about the E-Type Series 3

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Doddsy
Posts: 23
Joined: Sun Jan 01, 2017 8:53 am
Location: Teddington
Great Britain

#1 Stromberg Temperature Valves

Post by Doddsy » Fri Jul 24, 2020 10:05 am

Im still not satisfied with the idle setting on my car but learning a lot. I would like to take the temperature valves out of the equation but not so as to permanently destroy them ie so not just by bending the bi-mettallic strip (just in case I decide to put them back). I presume they need to be set to an open position and not closed. How should one do this ?
Teddington UK. Series 3 OTS 1972. Owned since 1982.

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baganz.sven@web.de
Posts: 126
Joined: Tue Mar 21, 2017 7:58 pm
Germany

#2 Re: Stromberg Temperature Valves

Post by baganz.sven@web.de » Fri Jul 24, 2020 1:20 pm

Hi,

after reading a lot of posts in the forum (and discussion the item with a carb specialist in Germany) I have set mine to closed position using the fixing screw.
Doing so it is easy to reactivate them without bending.

Most of them were stuck in closed position anyway.

You can find a lot of different positions in the forum, I have had the same discussion 3 years ago.
You can find the discussion here in the forum: "Stromberg carb temperature compensators"

Best regards

Sven
Sven
'71 S3 coupe LHD manual

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Topic author
Doddsy
Posts: 23
Joined: Sun Jan 01, 2017 8:53 am
Location: Teddington
Great Britain

#3 Re: Stromberg Temperature Valves

Post by Doddsy » Fri Jul 24, 2020 9:24 pm

Thanks Sven. If they are set closed, is the idle then set with the throttle valve being just a bit more open? (I presume this will then compensate for the loss of additional airflow past the throttle valve when open).

By screwing down the adjuster screw inside the temperature compensator, I assume that the valve doesn't open at operating temperature at all, even slightly would mess things up.

I have just tried inserting a couple of washers under the bimetallic strip. This then means the the valve is held open (and would be moved to even more open at temperature). I wonder has anyone tried this?
Teddington UK. Series 3 OTS 1972. Owned since 1982.

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Bob.
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Joined: Fri Sep 18, 2015 9:05 pm
Location: North Gloucestershire
Great Britain

#4 Re: Stromberg Temperature Valves

Post by Bob. » Mon Jul 27, 2020 4:29 pm

Hi Nigel
The temperature compensator is an emission control device intended to compensate for variations in fuel air ratio caused by heat transfer from the engine to the carb body, eg when car is stationary. It is intended to be fully closed up until 45°C (approx) and fully open by 60°C.
If you want to block it off for trial purposes it is not necessary to do anything other than remove the air cleaner and block the passage to it with a piece of tape, although it is essential that the rubber seal between the compensator and the carb body is intact to avoid air entering here.
If you want them to work as intended, all four should open at the same temperature and you can have hours of fun setting them up using a kettle, two bowls of water and two thermometers. If they have been closed down by tightening the nuts fully, the bimetallic strips will have been distorted and will need careful bending before correct operation can be achieved again. (it doesn't really take hours)
Hope this helps
Bob

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Bob
'71 S3

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