48 mm Weber Jets 13b
 

Hi
can anyone tell me what size jets they are running
on an 85 street port 13b with a 48 mm weber and
racing beat intake and ex.
thanks
Rod

Fawking search man. This has been answered hundreds of times...

Every engine is different. No two port jobs are exactly the same. Your exhaust will play a role in what jets you will require as well as what size chokes your running in your weber. Best thing i can say is get a A/F ratio meter and go for a drive and see where it is. As for me I'm running a 50mm diameter port in my 13B-PP with a weber 48IDA. I have 46mm chokes with 240 main jets, and 120 air correctors( which are too small and will be replacing just before race season with either 125, 130, 135 or 140's) and 90F10 idle jets (which are also too small)

Tuning a car takes time.....

Thanks for the help. All I could find was 12a stuff for a DCOE.
I have a 13b with a IDA

your starting point

43 venturies
70 idle jet
150 air
210 main

The way I jet a carb depends on gear, weight of the car. You want usable power, bigger chokes might give you more peak power up top BUT If you will run slow in the bottom end. Tell us more about what car its going in and gearing, how tall your tire is. My suggestion on a large street port is 40mm choke, On smaller street port 39mm choke If you are using a 48mm ida carb. The jetting/e-tube combo you are going play with.