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04-26-2014, 02:06 PM
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CC Member
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Join Date: May 2006
Location: Manchester,
MO
Cobra Make, Engine: Hurricane - FE
Posts: 627
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Not Ranked
FE Tuning - canted manifold
I am working on my Weber setup - 10 degree canted manifold on an FE - 48 IDA's. I've done some graphical analysis of the canted carburetor and the affect on fuel level.
With the float height set to 5.5-6mm, the fuel level is 43mm from the floor of the jet well. I have confirmed this both by layout and by physical measurement with fuel in the bowl.
When the carburetor gets tilted the 10 degrees, the fuel level in the emulsion tube well increases 1.75mm. The tilt changes the relationship of the fuel level to the venturi discharge port and also to the holes in the emulsion tube. If I understand the Webers correctly, this would cause the mid-range points to run a little richer than that of a carb setting level.
To anyone who is running an FE with the tilted carbs, have you tried lowering the float level this amount to see what affect it has on performance and tune?
Paul
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04-26-2014, 02:52 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Paul: This has been a suggested tip for the Weber equipped FE for quite a while. Sometimes they suffer from the dribble from aux venturi or pump jets as well after shutdown and the reduction of float level will help this as well.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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04-26-2014, 08:12 PM
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CC Member
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Join Date: May 2006
Location: Manchester,
MO
Cobra Make, Engine: Hurricane - FE
Posts: 627
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Not Ranked
?
Rick
Has anyone quantified the amount to lower the level?
My calc's are showing 2mm but it would be a big confidence boost if someone confirmed or identified the number.
Thanks
Paul
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04-26-2014, 08:58 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Paul: With the carbs tilted 10 degrees, remove the jet screens, and the main jet emulsion tube assemblies and look at the relationsip of the fuel level and the passage to the auxilliary venturies. As long as the fuel level is below the opening it will not drip unless the fuel is heated and percolates. Adjust the float to achieve the required level. Doing so will probably change the requred Emulsion tube from what is necessary for an uncanted carb.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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