 jetting question |
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| last337 |
 Apr 28 2013, 07:17 PM
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Member  Group: Members Posts: 421 Joined: 4-December 12 From: New Orleans Member No.: 15,221 Region Association: None  |
Okay so I had another thread troubleshooting these carbs but I've found the jetting to be the culprit. I am looking at Bob Tomlinson's suggestions and he is suggesting bw a 1.45 and 1.55 for the main jet. I currently have only a 1.15. I have a 52 for the idle and he recommends a 55. What do you guys think? I am running a stock 2.0.
Also, any suggestions on a vendor for jets? |
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| jmill |
May 1 2013, 08:39 PM
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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 |
QUOTE(last337 @ May 1 2013, 06:45 PM)  So I talked to john at air cooled.net and he said Tomlinson's book is wrong. He think I should keep my mains at 115, go down from 52 to 50 on my idle jets and go down from 200 to 180 on my air correction. He also suggested hooking up the vacuum line on my carbs to my dizzy; I currently have the port plugged on carb and open on dizzy. What do you guys think? I agree that Tomlinsons book is heavy on the main jet sizes but he also goes with the larger AC jet which will lean the mixture (F11) at higher velocities. Remember the book was written over 20 years ago for Bug engines. Fuel was cheap and big carbs on small engines were the hot ticket. Those large jet sizes eliminated transition problems with low velocities. IMHO the 115 and 50 idles are on the small side and might leave you lean at transition. The 180 ACs will then enrichen the mixture (F11) at higher velocities. My swag at jet sizes with a stock cam would be 55 idles and 120-125 mains with a 200 AC. I have a 25 year old narrow band AFR meter and love it. They are great tuning tools. |
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Posts in this topic
last337 jetting question Apr 28 2013, 07:17 PM
ThePaintedMan
Okay so I had another thread troubleshooting thes... Apr 28 2013, 07:47 PM rhodyguy easier to keep track of what's happening and w... Apr 28 2013, 08:00 PM
last337
easier to keep track of what's happening and ... Apr 28 2013, 08:03 PM last337 So do you guys think a 150 is what I should go wit... Apr 29 2013, 02:29 PM michael7810 My 1911 has 135 mains and AF is 12.5 at WOT (IDF40... Apr 29 2013, 03:49 PM last337 I spoke to a guy at dirtyracingandrods and he seem... Apr 29 2013, 04:39 PM ThePaintedMan
I spoke to a guy at dirtyracingandrods and he see... Apr 29 2013, 05:04 PM last337 Well from what I understand the main circuit picks... Apr 30 2013, 07:14 AM rhodyguy what is the venturi size? :unsure: engine off, loo... Apr 30 2013, 08:01 AM last337 Currently this is everything I verified
115 main
5... Apr 30 2013, 08:12 AM rhodyguy thomlinsons base line guide for dual idf 1835-2000... Apr 30 2013, 08:33 AM last337 What does the main air correction jet do? Apr 30 2013, 09:25 AM rhodyguy p. 59. Apr 30 2013, 09:39 AM last337 So I talked to john at air cooled.net and he said ... May 1 2013, 05:45 PM yeahmag I think you really need an LC-1 or LM-2. The LC-1 ... May 1 2013, 05:58 PM 396
I think you really need an LC-1 or LM-2. The LC-1... May 1 2013, 08:05 PM ThePaintedMan
I think you really need an LC-1 or LM-2. The LC-1... May 1 2013, 08:29 PM jmill
A change in air correction jets results in a rich... May 1 2013, 08:49 PM |
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