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Old 03-30-2013, 06:01 PM
SF_SN888KE's Avatar
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Join Date: May 2006
Location: San Francisco, CA
Cobra Make, Engine: Cutting Edge Replicas, 427 World block SBF, TWM Injection
Posts: 309
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Default Weber Intial setup - back to basics help

been reading a lot of the weber tuning on this and other sites.

Have SBF 347, mild cam, 10:1 compression. New Jim Inglese system with turkey pan for Daytona replica.

If you are familiar with Inglese linkage, sync main carb (cyl 3-4) with carb on cyl 1-2, then sync carb on cyl 7-8, then carb on cyl 5-6. Could not get carb on cyl 5-6 to come up, so added idle screw and brought it up. essentially all carbs are very close. (cyl 5 is lower than cyl 6 - but that is another story).

Question for "best lean". It is my understanding that ALL of the mixture screws should be set the same. for example start ALL at 3/4 out from bottom and then listen for sound / rpm. Does this mean adjust "ALL" screws out/in the same? I tried this in the first go around and 2 plugs were nice and brown, 3 were white lean, 3 were black and my eyes were tearing! Gas mileage sucked. MPG dropped 3 from the Holley! Seems to me that each mixture screw should be set independently. Which is correct?

Then: if the 3 are lean white/ 3 black rich, I assume that you would change jets?

In a perfect world with a perfect engine / identical carbs - it makes sense to me that all mixture screws and jets would be the same. Should only the 4 middle carbs be synced and the 4 outter carbs go for the ride (or bend cyl 5 to match cyc 6?) Should ALL mixture screws be the same position from bottom? Should ALL jets be the same?

Want to get the carbs a little closer.

Thanks for the help ...
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