Weber jet recommendation |
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Weber jet recommendation |
SKL1 |
Nov 22 2015, 09:32 PM
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#1
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Senior Member Group: Members Posts: 1,603 Joined: 19-February 11 From: north Scottsdale Member No.: 12,732 Region Association: Upper MidWest |
2.0 with Webcam and Mallory distributor. Timing set and carbs synched, but really flat just off idle. Runs better when further up in the revs.
At 1800' in AZ. Currently: 40 IDF, 200 air correction, F11 emulsion tube, 115 main, 58 idle, 55 float bowl, 28 venturis TIA... |
jmill |
Jan 14 2016, 03:29 PM
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#2
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
The reason you have that flat spot is due to the idle jets dropping out before the mains come in (lean transition). You're trying to fix that flat spot by increasing your jet size. It helps a bit but it's not going to eliminate it. You have to do 1 of two things and maybe even both to fix it.
#1 - Smaller venturis - increase vacuum signal to the mains to bring them in sooner #2 - Emulsion Tube - get an emulsion tube that works on a lower vacuum signal and provides a richer transition like the F7 You'll then find your idle jets are too large and you'll have to drop down to 50-55. If you go with the F7 you may even need to drop down your main jet size and step up the AC jet to lean it up at the top. |
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