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Twin choke SU DU6

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Old Jan 25th, 2020, 04:27   #11
Ron Kwas
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...looks like a single central float and fuel bowl from the pictures...I don't see any reason to have separates...
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Old Jan 25th, 2020, 10:20   #12
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In real life, what would be the advantages?
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Old Jan 25th, 2020, 10:56   #13
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...looks like a single central float and fuel bowl from the pictures...I don't see any reason to have separates...
Agreed it looks like a central float bowl but what happens under had acceleration? Does the rear half flood and the front half starve?
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Old Jan 25th, 2020, 11:26   #14
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In real life, what would be the advantages?
Size mainly, the option to get twin carb performance in a tight space. If you look at the pics, one of them has suggestions of engines they may fit including the Coventry Climax (think HIllman Imp) where space is at a premium and other carbs wouldn't necessarily fit.

On something like a B18/20, the possibility no doubt exists to fit a pair of these, giving one choke per cylinder operation.
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Old Jan 25th, 2020, 11:39   #15
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So in our Volvo case,a vanity program.Probably a real pita.
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Old Jan 25th, 2020, 11:57   #16
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So in our Volvo case,a vanity program.Probably a real pita.
Quite likely, it's hard enough setting up a pair of normal twin carbs at times with their own separate float chambers but i suspect these would be even harder to set up. Probably get better results overall once set up correctly but would it be worth the extra grief to get there?
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Old Jan 25th, 2020, 13:25   #17
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Did quite a bit of investigation of this setup recently and found that as constructed the carbs were only used for racing. One issue with them is as constructed they do not idle properly, but for racing that is not a problem.
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Old Jan 25th, 2020, 22:51   #18
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I am a real fan of the SU and they have to be one of the best carbs going. As nice as this version is I do not see them being practical for road use.

What would be a interesting carb to play with is the Fish, I have never seen one but they should be a great carb and not sure why they did not take off

https://en.wikipedia.org/wiki/Reece_Fish_Carburettor

or much more detail
http://minnowfishcarbs.co.uk/full-history
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Old Jan 25th, 2020, 23:58   #19
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I don’t have a Volvo with SU carburetors but I do have them on a Riley: ~ The attached had been on that forum regarding adjustments & faults—thought that it may be of interest to others.
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