CO level and setting up carbs

Mar 16, 2005 4 Replies
J

I am considering buying a Gunsons Gastester to set up the Solex carb on my 1972 BMW 2000 Touring, and the twin SU's on my '65 Amazon and whatever it is on my Capri 280. I have two questions:



a. Is there a standard CO figure that you always try to achieve, or does it vary per car. If the latter, where do you obtain that figure; I don't believe I have seen it in my Haines manuals.



b. How will I make sure the mixture on the SU's is the same for each carb; I have the Gunsons Carbalancer but that I use to set the throttle response...right?



Many thanks!


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N

Depends on the year the car was registered, some cars only have to meet visible smoke standards, most 4.5%CO and from 1993 onwards or near enough it was even lower..... Sorry can't help on dates and CO figures.

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C

No. You use it to balance the carbs thats why its called a Gunson Carb Balancer. You attach it to both and tweak the idle adjust on them both until its ticking over at the right speed and both are drawing an equal amount of air.

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M

Then you make sure they are both still close when you just crack the throttle a little.

CO varies by car, but older things with carbs about 2.5 is usually fine, slightly later and dejected like the 280 is 1.0 New stuff needs specialised equipment.

mrcheerful

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