Weber tuning tutorial

[Earl J]

Originally Posted by Tennessee Tim

I've been working on this tutorial as I have been tuning my car. As little information as there is out there about tuning IDAs, I though I would try to give back and increase the knowledge base a bit. I would appreciate any feedback and particularly anything that appears to be in error.

It's not done yet, but getting close. Any feedback is appreciated.

Tim

Hello Tim,

Hats off to you for putting this in writing in a manner in which (in layman’s terms) ordinary folks can understand the workings of the Weber 48 IDA carburetor. Your writing has put my thoughts into black and white as a comprehensive piece. Very well done in my opinion and very much needed for people struggling.

I did however find (I think a typo) a needed correction. I’m not trying to be a critic:

"For the size 55 jet, the area is 0.238 mm2. The size 55 jet is therefore 21.4% larger than the 55 jet and will therefore flow 21.4% more fuel."

Shouldn’t that read 50 jet? Again I’m not criticizing at all, just a correction.

Also I know you are refining this wonderful piece. The (4) illustrations (towards the end) of the emulsion tubes and gas flow; could show the Main Jet against the body. It currently illustrates gas going up the Main Stack Well as opposed to flowing through the jet.

Lastly here is a photo on my Main Jet stack with fuel flow stains on my emulsion tubes, you can use the image if it helps any.



Best Regards,
Earl