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FE 390 with 48IDA - need help for setting
Hi guys,
I have a FE390 stroked to 454cui with 4 48IDA Webers on top. Actually I try to find agood setting of A/F ratio.... Here is what I have : IdleJets : 60 / 70F10, Main jets : F11/75, cam110. I turned in all idlejets screws and turned them out 1 full turn. Engins runs good and blows a little bit black dust out of pipe while acceleration.....but when I relese the gas pedal the the engine "bangs" out of the pipes ! What do you think is the problem ? Any help and suggestions would be fine - Thanks ! Best, Stephan |
1 Attachment(s)
I've attached an example of the weber jetting survey I did a while back. Every engine has different needs so, nothing is set in stone. Two things are pretty certain, when you have your idle circuit sorted out. It'll idle w/o smelling rich & setting the main circuit will be a lot easier. Obviously, the best method for doing all of this is is with an A/F bung on each header pipe. I didn't/don't use this method & it's been a long process.
From what I read, popping out the pipes means too rich. Out of the carbs, too lean. |
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