 air bypass screw, weber 40 idf |
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| ruddyboys |
 Sep 20 2004, 11:53 AM
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#1
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Hummel eigentümer  Group: Members Posts: 595 Joined: 3-March 04 From: Monroe, NY Member No.: 1,749 Region Association: North East States  |
I am not sure if turning the air bypass screw out or in gives you more air to the carb?
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Replies(1 - 2)
| maf914 |
Sep 20 2004, 12:11 PM
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#2
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None 
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The Haynes Weber manual states that when synchronising the throats on a single IDF carburator, the bypass screw locknuts should be loosened and the screws then gently screwed in to the seats. If the throats flow differently then the bypass screw for the one with less flow should be adjusted. I assume this means that the flow will increase as the bypass screw is screwed out.
On my dual 40 IDF's I had one carb that was balanced with both bypass srews seated and the other carb required one bypass screw to be adjusted. |
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| rhodyguy |
Sep 20 2004, 12:23 PM
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#3
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,240 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
opening them up allows more air to enter without going thru the butterflies. so opening them causes a leaner condition. tomlinson's book states that they should be no more than 1 1/2 turns off seated.
kevin |
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