Club Cobra - Weber float setting for FE

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Weber float setting for FE

For anyone that is having a problem with tuning of Webers on a BB FE with the 10 Deg angled manifold, I have a hint. The float level on Webers is critical to all performance and jetting. All of the data that I have seen for the float level setting for the 48 IDA is only for the carbs when they are level - not angled. The spec is given as the distance the float sticks up above the carb deck when the float tang closes the needle valve.

For the angled 48 IDAs: (When the fuel connection is on the inside of the carb: the carb is leaning towards the float pivot.)

1. Measure the height of the ball in the needle valve when the lid is inverted and the ball sits closed.

2. Using a piece of rubber tubing, wedge the float at the height that the tang on the float is at the same depth from the carb deck that you measured in step 1. (the height of the needle valve)

3. Measure the height of the float above the carb deck. It should be 4.2mm. (Not the 5.5-6.5mm that the Weber books call for)(be sure that you measure the body of the float and not the weld seam in the middle)

4. Bend the tang if necessary to achieve the desired height.

Hope this helps.

Hi Zimmy,
i am in the process of setting the float level after replacing the original needle and seat assy with a set of Jaycee glass ball float needles.
The question is: should the height of the float (those 5.5 or 4.2 mm like you suggest) be measured with the gasket (the one under the cab cover) in place or without it.
Since I am using a plate to hold the needle valve in its position in the carb and move the float until the tang hits the needle ball, using the gasket or not makes a BIG difference in measured float float height.
Your help is appreciated.

Today I worked on the Webers trying to set the float level correctly. The most important thing is the fuel level which has to be 5.75mm below the bottom edge of the hole which feeds the spray noozle. This is the hole on one side of the main well where the main jet goes in. In a perfectly vertical position of the Webers the float has to be 5.5-6 mm above the main bodys surface with the cover off in order to reach that fuel level of 5.75 mm below the noozle hole.
If the Webers are 10º inclined towards the float pivot, the fuel moves away from the main jet well and the level becomes about 2mm lower than specified.
Adjusting the float to 7.5mm above the main bodys surface (with the gasket on) produces the correct fuel level in the main well.
Zimmy, how did you calculate those 4.2mm ?

Eljaro:

I was given that figure by Inglese from their experience. I have since spoken to some others that say that the 10 deg doesn't make that much change and the value could stay at the 5.5mm. I am planning to take my car to Cobra Automotive this winter for a detailed tune (they have a tremendous amount of experience with Webers on 289 and 427 engines) and I'll let you know what they say and set them for.