| [ Total Views: 820 | Total Replies: 5 | Thread Id: 105085 ] |
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 spearsy
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| posted on February 15th, 2014 at 03:39 PM |
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Dellorto carbs
I have a set of 40mm Dells on my car which are running well but I am trying to get my head around some theoretical issues.
Carby feeding No's 1 & 2 cylinder mixture screws are between 1 and 2 turns out.
Carby feeding No's 3 & 4 cylinder mixture screws are between 3 and 4 1/2 turns.
Also 1 & 2 carbs idle speed screw is 2 to 3mm further out than 3 & 4 carb but butterflies are open the same amount(3 thou).
Why would this be so?
Carbs have been synced with a uni-syn and all 4 barrels are the same.
I have been pondering over this for a week or so and can't seem to figure it out. Any ideas? cheers Adam
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vwo60
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| posted on February 16th, 2014 at 09:56 AM |
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I run a set of 48mm DRLA's on my ghia, have you checked the idle jet sizes with a jet gauge, if they have the same size stamped on all four it does
not mean they have not been drilled out, this is what i would do with all the jets so you know you have all the same sizes . then you have a known
starting point.
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vassy66T1
A.k.a.: Marcus Vass
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| posted on February 17th, 2014 at 08:25 AM |
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Agree with the above.
Have you also had the idle mixture screws out to check they are in good condition?
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 matberry
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| posted on February 17th, 2014 at 09:13 AM |
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Or the idle mixture screw O-rings? Or any of the seals and O-rings for that matter
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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spearsy
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| posted on February 17th, 2014 at 01:41 PM |
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Thanks guys, do you know what size O rings the idle mixture screw takes as I would be able to get some from work. Jets are definitely the same size.
cheers
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matberry
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| posted on February 17th, 2014 at 02:12 PM |
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My guess is around 4 x 1.5 but that is purely by memory
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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