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Thread: Max choke size for weber 48 dco/sp

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    Bodger

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    Max choke size for weber 48 dco/sp

    Can anyone help, What is the maximum usable choke size to put in a 48 dco/sp carb? Iv read that a to big choke will reduce the signal strength over the main jet but is this only a factor at lower rpm's?

    will going from the std 42mm choke to 45-46mm help with a powerband of 6000-8500rpm

    acording to the weber chart/graph "Venturi size vs rpm at peak power" 42mm will be on the conservative size I want to make perk power as high as possible.

    I have experimented with 38 and 40mm chokes in a 45 dcoe and found no difference. This testing was on a drag strip and not a dyno so there are obviously other variables but the car would run within a few hundredths with either chokes.

    I'd be appreciative if anyone has any info or back to back results they have found

    thanks joe
    https://www.youtube.com/watch?v=OE7B0lspsmQ

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    Re: Max choke size for weber 48 dco/sp

    You don't say what engine and cc it is.

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    Bodger

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    Re: Max choke size for weber 48 dco/sp

    The 48,s are going on a 2023cc pinto. Drivability below 5500rpm is unimportant as the car is only used for drag racing and will be launched at 8000rpm. I have read if a choke becomes over a certain size the aux Venturi becomes the flow restriction and the too large choke only reduces the signal strength over the main jet.
    https://www.youtube.com/watch?v=OE7B0lspsmQ

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    Re: Max choke size for weber 48 dco/sp

    i cant imagine any 2.0 pinto needed bigger than a 42mm choke
    Last edited by Graham; 07-05-2017 at 08:19.

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    Re: Max choke size for weber 48 dco/sp

    Almost all Pinto's I've ever seen on 48 DCO had smaller chokes like 38 mm fitted. I'm wondering any Pinto 2 ltr would need a 48 DCO. I can hardly believe they can outflow a correct setup 45. Reason why you probably did not noted a difference between 38 and 40 mm choke in the 45 DCOE

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