Need advice on twin 45 webers QLD

Nick

Hello guys ive got twin 45 webers on my 240. ive got a b23 in it with the kjet holes plugged off and its not running 'perfectly and i was wondering what would be the correct venturi and jets to be used with just a stock motor. the motor seems like it like how it is at the moment, and rips pretty well but im just wanting to double check everything.

thanks gurus

Spac

My suggestion would be to take it to a competent, old school Weber guru.

The will most likely be an old Italian car specialist or a race/rally specialist.

Some dyno specialists are also very good, some are clueless.

You can’t jet on the internet. I have seen significantly different setups both work well on supposedly identical motors, and I have seen relatively minor differences in engines make a nice set of carbs suddenly run like pooh.

Ben240s

It's sounds like you could have multiple things going on,

As said above you can't jet on the net , every car is different.

Do you know if they are in tune with one another ? Are they even synced ? Another issue you'll have and running like poo

As said above your better off going to a tuner

dmc

Try Daniel at Weber Performance, he will recommend choke and venturi sizes after asking you a lot of questions. This would be the first step.

As above it is tough to get jets right from just research. What air filters? K&N?

I sorted out a single weber years ago (on a B20) by getting the chokes and venturis sorted, then the pump jets, then the idle jets (which are also progression ports on a Weber) then the mains and air bleeds - in that order. In the end it was great and the O2 sensor agreed - it took time though. And it HAULED!

A good dyno shop will sort this in a few hours, or you can get really close to perfect by doing it yourself with some simple tools and an O2 sensor/air fuel ratio meter.

Be aware, Weber parts are expensive! The carb tune above was $400 in parts! The twin DCOEs on my 1800 were about the same money some years ago just to get them the same, they had different parts in them :-(.

They are just balanced and not really tuned, they are close enough and it is a 'one day' thing. It is in many pieces at the moment waiting for paint.

Call Dan, he will help. And sell you really expensive jets and chokes etc.