 Weber 40 or 44 on 1.7?, Carb question |
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| Boothy |
 Jan 4 2020, 08:58 AM
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#1
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Member  Group: Members Posts: 108 Joined: 17-January 19 From: Abington, MA Member No.: 22,805 Region Association: North East States  |
Morning,
Semi-newbie here. Have a 1.7 daily driver with a big bore kit and CB street cam. Have the Weber progressive but want to switch to 40 or 44. I get the feeling that, where it's not a big engine, 40s or 44s? Again, daily driver. Don't need to set the world on fire. Thanks! |
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| Ansbacher |
Jan 4 2020, 10:40 AM
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#2
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
QUOTE(Boothy @ Jan 4 2020, 09:58 AM)  Morning, Semi-newbie here. Have a 1.7 daily driver with a big bore kit and CB street cam. Have the Weber progressive but want to switch to 40 or 44. I get the feeling that, where it's not a big engine, 40s or 44s? Again, daily driver. Don't need to set the world on fire. Thanks! Don't go over 40. Bigger is not better in this case. Ansbacher |
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| Superhawk996 |
Jan 4 2020, 10:45 AM
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#3
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914 Guru Group: Members Posts: 7,203 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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QUOTE(Boothy @ Jan 4 2020, 09:58 AM) Morning, Semi-newbie here. Have a 1.7 daily driver with a big bore kit and CB street cam. Have the Weber progressive but want to switch to 40 or 44. I get the feeling that, where it's not a big engine, 40s or 44s? Again, daily driver. Don't need to set the world on fire. Thanks! I initially ran my 1st car on Weber IDF 40's as a stock 1.7L with a 32mm venturi. It was overcarburated. After it was rebuilt to 96mm pistons it was more appropriate. I was running the stock 1.7L heads. You don't mention the displacement of your big bore but if you're around 2056 cc or so, the Weber 40 IDF's will be plenty. Low end torque was not the forte of this engine. In reality I probably should have gone down to a 30mm venturi and rejetted. Be aware that although they will run "out of the box", you'll still have to play with jetting to fit your driving style. |
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| rhodyguy |
Jan 4 2020, 10:48 AM
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#4
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,248 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
1911cc? 28mm venturis.
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| dr914@autoatlanta.com |
Jan 4 2020, 10:52 AM
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#5
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914 Guru Group: Members Posts: 8,185 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
Dead on the money!
QUOTE(Ansbacher @ Jan 4 2020, 09:40 AM) QUOTE(Boothy @ Jan 4 2020, 09:58 AM) Morning, Semi-newbie here. Have a 1.7 daily driver with a big bore kit and CB street cam. Have the Weber progressive but want to switch to 40 or 44. I get the feeling that, where it's not a big engine, 40s or 44s? Again, daily driver. Don't need to set the world on fire. Thanks! Don't go over 40. Bigger is not better in this case. Ansbacher |
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| Boothy |
Jan 4 2020, 11:29 AM
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#6
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Member Group: Members Posts: 108 Joined: 17-January 19 From: Abington, MA Member No.: 22,805 Region Association: North East States |
Got it! Thanks everyone! I appreciate the help.
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| porschetub |
Jan 4 2020, 08:35 PM
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#7
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Advanced Member Group: Members Posts: 4,873 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Just done a 1.8 carb cam motor on Dellorto DRLA's 36mm easy to tune with 28mm vents,nice idle with easy starting,I really like these carbs.
 40mm will run fine with 28mm vents on a mild small bore motor,and provide a good driving street car. I'am constantly amazed @ the amount of folks trying to run oversize carbs on these engines ,they just run like (IMG:style_emoticons/default/stromberg.gif) and are SO hard to tune due to poor vacuum signal ,leave the big carbs to the high rpm big horsepower big bore motors IMO. |
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