1700 BDR carb setup

[mikestifel]

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:

45DCOE

38mm chokes

5mm auxiliary venturis

145 main jet

175 air corrector jet

F16 emulsion tube

60F9 idle jet

45 pump jet

Right 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?

[anthonym]

Rob at Ratrace would know - +44 7956 269605 

[toldfield]

You might look into Keith Franck's research and jetting at

https://vintagetechnologygarage.groups.io/g/sidedraft

You have to register to access some of the information but he has essentially reinvented the jetting for Weber carburetors.

 

tom

[Roger King]

Send me a Blatmail and I'll get back to you.

[mikestifel]

PM sent.

Thanks for the replies.  I was ready to give up hope.

[Nigel Blandin]

Listen to uncle Rog, Mike.

he knows the story of BDR carbs! Sorted mine years ago and they were spot on afterwards.