mikestifel Posted April 16, 2023 Share Posted April 16, 2023 I've never really looked closely at the carbs on my car. It's always run "well enough" so I didn't want to go down that particular rabbit hole. Anyhow, during this years spring carb tune I was having an unusual issue so I dove in a little bit. It turns out that my 45DCOEs have 38mm chokes in them which strikes me as a bit much for that motor. I'm wondering what people use as a baseline for setting up carbs for that motor. I can do the fine tuning but it would save me a lot of time and money if I have a good starting point. Where I am I can get lots of advice about small block chevys but not so much with BDs. Here's what I have right now, where should I go with it?Engine:Unmodified 1700cc BDR.Carbs:45DCOE38mm chokes5mm auxiliary venturis145 main jet175 air corrector jetF16 emulsion tube60F9 idle jet45 pump jetRight now I'm thinking 36mm chokes with 45F9 idle jets and 40 pump jets. Sound like a good place to start or would I be better off going down to 34mm chokes? Link to comment Share on other sites More sharing options...
anthonym Posted April 27, 2023 Share Posted April 27, 2023 Rob at Ratrace would know - +44 7956 269605 Link to comment Share on other sites More sharing options...
toldfield Posted April 27, 2023 Share Posted April 27, 2023 You might look into Keith Franck's research and jetting athttps://vintagetechnologygarage.groups.io/g/sidedraftYou have to register to access some of the information but he has essentially reinvented the jetting for Weber carburetors. tom Link to comment Share on other sites More sharing options...
Roger King Posted April 27, 2023 Share Posted April 27, 2023 Send me a Blatmail and I'll get back to you. Link to comment Share on other sites More sharing options...
mikestifel Posted April 28, 2023 Author Share Posted April 28, 2023 PM sent.Thanks for the replies. I was ready to give up hope. Link to comment Share on other sites More sharing options...
Nigel Blandin Posted April 29, 2023 Share Posted April 29, 2023 Listen to uncle Rog, Mike.he knows the story of BDR carbs! Sorted mine years ago and they were spot on afterwards. Link to comment Share on other sites More sharing options...
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