 Carburetor jetting, Recommended base line jets for Weber 40s |
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| Slanski62 |
 Jan 10 2017, 11:14 PM
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#1
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Newbie  Group: Members Posts: 2 Joined: 22-October 16 From: Chapel Hill, NC Member No.: 20,520 Region Association: South East States  |
Hello. I'm new to the forums here but have been reading and learning a lot. Thank you.
I have a pair of Weber 40s I plan to use on a 2056 I'm building. The carbs are used, and I don't know how they're jetted. Can anyone recommend a base line? I'm at an altitude of 486 feet. I appreciate any suggestions! Steve |
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| jmill |
Jan 12 2017, 05:57 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 |
145 isn't out of the ballpark if he's using an ethanol blended fuel. The 220 AC jet will also lead to a leaner mixture at higher velocities. 200 is base with with less than leading to enrichment and greater than leaning the mixture.
X3 on checking for vacuum leaks and increasing idles. You also didn't state if it was exhaust or carb pops. Also check for exhaust leaks if exhaust pop. |
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| amfab |
Jan 13 2017, 01:04 PM
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#3
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Member Group: Members Posts: 401 Joined: 17-May 16 From: Los Angeles Member No.: 20,004 Region Association: None 
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QUOTE(jmill @ Jan 12 2017, 03:57 PM)  145 isn't out of the ballpark if he's using an ethanol blended fuel. The 220 AC jet will also lead to a leaner mixture at higher velocities. 200 is base with with less than leading to enrichment and greater than leaning the mixture. X3 on checking for vacuum leaks and increasing idles. You also didn't state if it was exhaust or carb pops. Also check for exhaust leaks if exhaust pop. Thx for all the replies I get both. Exhaust popping on decell when cold. carb pops on initial start up and randomly every minute or two when warm and cruising. I have no velocity stacks, could that help? No idea what my gas has in it out here in Southern CA -Andrew |
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Posts in this topic
Slanski62 Carburetor jetting Jan 10 2017, 11:14 PM
stugray First question: What venturis does it have?
If you... Jan 11 2017, 07:58 AM maf914 Here is a jetting guide from the Weber Tech Manual... Jan 11 2017, 08:12 AM jmill The chart above doesn't include the IDF.
My b... Jan 11 2017, 01:59 PM john77 If all else fails, you can email a guy called Bud ... Jan 11 2017, 02:09 PM
Slanski62
If all else fails, you can email a guy called Bud... Jan 11 2017, 08:03 PM Steve Pratel From my notes Dell 36's (flow similar to Weber... Jan 11 2017, 10:26 PM amfab I have a set of IDF 36s with 32 venturis
It has 4... Jan 12 2017, 10:37 AM stugray
I have a set of IDF 36s with 32 venturis
It has ... Jan 12 2017, 11:03 AM porschetub
I have a set of IDF 36s with 32 venturis
It has... Jan 12 2017, 03:58 PM jmill You'll know if it has ethanol in it. There... Jan 13 2017, 04:40 PM amfab Great! Sorry for the thread hijack, I saw this... Jan 13 2017, 06:28 PM jmill It's been awhile since I've ordered jets. ... Jan 13 2017, 06:41 PM michael7810 I like Pierce for Weber parts and advice Pierce Jan 13 2017, 09:37 PM stugray I have used this place recently with good service:... Jan 14 2017, 10:56 AM jmill
I like Pierce for Weber parts and advice Pierce
... Jan 14 2017, 06:54 PM michael7810
[quote name='michael7810' post='2443690' date='Ja... Jan 15 2017, 06:05 AM Tedman5 Aircooled.net is a great source for Weber parts al... Jan 15 2017, 03:05 AM |
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