 Downsize a Weber 44 to 40?, carbs |
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| r3dplanet |
 Aug 22 2013, 02:48 PM
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#1
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Senior Member  Group: Members Posts: 679 Joined: 3-September 05 From: Portland, Oregon Member No.: 4,741 Region Association: None  |
I'm new to Weber carbs. I have in my possession a pair of Weber 44 carbs, but I need 40s. Here and there I've read that these carbs have the same body but can be switched from one size to another by swapping parts.
If true, which parts? Gotchas? Anyone care to specifically conceptualize this for me? Thanks, Marcus |
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Replies(1 - 9)
| SirAndy |
Aug 22 2013, 03:42 PM
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Resident German Group: Admin Posts: 41,675 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(r3dplanet @ Aug 22 2013, 01:48 PM)  I'm new to Weber carbs. I have in my possession a pair of Weber 44 carbs, but I need 40s. Here and there I've read that these carbs have the same body but can be switched from one size to another by swapping parts. If true, which parts? Gotchas? Anyone care to specifically conceptualize this for me? You can choke down 44s by running smaller venturis and downsizing your jets etc. (IMG:style_emoticons/default/shades.gif) |
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| tomeric914 |
Aug 22 2013, 05:38 PM
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One Lap of America in a 914! Group: Members Posts: 1,259 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States 
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QUOTE(SirAndy @ Aug 22 2013, 05:42 PM) You can choke down 44s by running smaller venturis and downsizing your jets etc. (IMG:style_emoticons/default/shades.gif) Which is the beauty behind Webers. Here's a link to a chart of what comes from the factory for Webers: http://www.cbperformance.com/SearchResults.asp?Cat=152 44's come with 36mm venturis, 40's come with 28mm venturis. The smallest I've seen that you can get down to is 32mm for 44's. http://www.cbperformance.com/SearchResults...w=90&page=1 |
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| Mblizzard |
Aug 22 2013, 07:41 PM
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
I did this for my 1.8. Went with a 28 vent and a fairly large idle jet. Ran pretty well. The cool that was that I just upped to a 2056. Changed a few that is and they work on the 2056.
I went through a lot of trial and error to get mine right. It could be worthwhile to have them professionally set up. |
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| wndsnd |
Aug 23 2013, 03:29 PM
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#5
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You wanted a horse, but got a goat. Nobody wants a goat.... Group: Members Posts: 2,861 Joined: 12-February 12 From: North Shore, MA Member No.: 14,124 Region Association: North East States  |
I am going through this now.
I bought brand new 44IDF's from Pierce Manifold for a 2056+ build I am commissioning. In the mean time, I am going to run them on a 1.7. They came with 36mm Venturi's 60 idles and 135 mains Pierce recommends for the 1.7 30mm Venturri's #71507.300 55 idles (74405.055) and 125 mains (73401.125). We shall see how they run! John |
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| DBCooper |
Aug 23 2013, 04:14 PM
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
Hey John, is Pierce cool or what? Totally under the radar unless you want Webers on your V8, but I love those guys.
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| ChrisFoley |
Aug 23 2013, 06:06 PM
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#7
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I am Tangerine Racing Group: Members Posts: 7,934 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(wndsnd @ Aug 23 2013, 04:29 PM) I am going through this now. I bought brand new 44IDF's from Pierce Manifold for a 2056+ build I am commissioning. In the mean time, I am going to run them on a 1.7. They came with 36mm Venturi's 60 idles and 135 mains Pierce recommends for the 1.7 30mm Venturri's #71507.300 55 idles (74405.055) and 125 mains (73401.125). We shall see how they run! John try 30 vents 47 idles 110 mains 140 air corr. 55 idles are way too rich for low speed running. |
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| CptTripps |
Aug 23 2013, 06:31 PM
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:: Punch and Pie :: Group: Members Posts: 3,584 Joined: 26-December 04 From: Mentor, OH Member No.: 3,342 Region Association: Upper MidWest |
I had 44s in a 2.0 and it was a bit temperamental on the throttle. Set it up with 40s and it ran like a champ. Great move.
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| wndsnd |
Aug 23 2013, 06:57 PM
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You wanted a horse, but got a goat. Nobody wants a goat.... Group: Members Posts: 2,861 Joined: 12-February 12 From: North Shore, MA Member No.: 14,124 Region Association: North East States |
QUOTE(Racer Chris @ Aug 23 2013, 08:06 PM) QUOTE(wndsnd @ Aug 23 2013, 04:29 PM) I am going through this now. I bought brand new 44IDF's from Pierce Manifold for a 2056+ build I am commissioning. In the mean time, I am going to run them on a 1.7. They came with 36mm Venturi's 60 idles and 135 mains Pierce recommends for the 1.7 30mm Venturri's #71507.300 55 idles (74405.055) and 125 mains (73401.125). We shall see how they run! John try 30 vents 47 idles 110 mains 140 air corr. 55 idles are way too rich for low speed running. Too late - Pierce ships quick! |
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| wndsnd |
Aug 23 2013, 06:57 PM
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#10
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You wanted a horse, but got a goat. Nobody wants a goat.... Group: Members Posts: 2,861 Joined: 12-February 12 From: North Shore, MA Member No.: 14,124 Region Association: North East States |
QUOTE(DBCooper @ Aug 23 2013, 06:14 PM) Hey John, is Pierce cool or what? Totally under the radar unless you want Webers on your V8, but I love those guys. I do too..... Mr. Racer Chris turned me on to them...... |
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