Bristol 400, 1950 question about a button
 

Dear all,
I have just bought a nice fantastic Bristol 400.
My question is about the button "CARB". Can someone explain what that button is about and how to use it.
Thanks Roman

Push or pull the button...then turn the key and perhaps pull the choke. Motor will start and you will then turn the switch off.
It powers a solenoid that feed fuel to the manifold. Will NOT work if you try to operate it with the key on first!

Dorien

Roman ,
Congratulations on your purchase. What carburettors are fitted to the engine ?? Solex or SU

The Carb button is a switch to a Solenoid which activates an enrichment device incorporated with the float chamber of the front SU carburettor only .
It will only work if the ignition is on .
There is also a Mixture button which operates a pull cable to a lever on the centre SU carb .
The rear carb has no enrichment /coke device fitted.

In cold weather from a cold start you usually have to activate both buttons , if it starts without it indicates the carbs are set way too rich.

If three Solex cabs are fitted the Carb button is not used , only the Mixture cable .


Could you please advise the chassis and registered number of the 400 and post a few photos on the Forum or direct to me to update the 400 Register

Thanks
Geoff Dowdle
BOC Joint 400 Registrar

Ho Dorien,
thanks for the explanation. A last question regards the button if you do not mind. What is the purpose of the button and when should it be used?
Thanks and have a great day!
Best regards,
Roman

Goeff,
thanks for the feedback. I will post some pictures in the next days. Best regards Roman

Geoff,
so in other words, if it is a Solex Carburettor the button CARB does not have a function, it only works with a SU carburettor?
Best regards,
Roman