i have dual 40 weebers and my buggy smokes black on idle and if i rev up and let off so im guessing idle jets my motor is a 2221 and the idle jets that are in now are 50s what is suggested i should have in them
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| Author: | jesse [ Sun Sep 18, 2011 8:41 pm ] |
| Post subject: | idle jet question |
i have dual 40 weebers and my buggy smokes black on idle and if i rev up and let off so im guessing idle jets my motor is a 2221 and the idle jets that are in now are 50s what is suggested i should have in them
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| Author: | jesse [ Sun Sep 18, 2011 10:27 pm ] |
| Post subject: | Re: idle jet question |
anyone? |
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| Author: | Aaron Creech [ Sun Sep 18, 2011 11:42 pm ] |
| Post subject: | Re: idle jet question |
50's sound about right. How far out are the mixture screws? Have you taken the tops off and checked the float levels? Also what is your fuel pressure? |
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| Author: | perrib [ Wed Sep 21, 2011 1:47 pm ] |
| Post subject: | Re: idle jet question |
LIke stated 50s sould be close, fuel pressure is critical as is float level. Also make sure the needle and seats are not seeping fuel at idle making it rich. Venturis are usually 2-6 mm smaller than the intake valve size.The smaller venturi the more bottom end torque. Fuel pressure is critical. 2.5 psi. Float level 10-11 mm. Start with 10.5 mm Emulsion tubes F-11 are the most popular Idle jets 1.6xs the size of the venturi. Mains 4.1-4.3 xs the size of the venturi. a little rich is better than too lean. Air 1-2 sizes larger than the main 1500 -2000 rpms is controlled by the idle circuit 2000-3000 is fed by the idles and the mains idle jet size and float level are what you use to tune this rpm range. 3000-4000 is fed from the mains 4000-5000 from the mains and airs acc pump jet use the smallest you can and still accerate. Adjusting the rod can make a significant change. It seems to work ok for most engines with small to medium sized valves. |
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