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!
Full Version: Weber 40 or 44 on 1.7?
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
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.
1911cc? 28mm venturis.
Dead on the money!
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
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
Got it! Thanks everyone! I appreciate the help.
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.
Click to view attachment
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
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.
Click to view attachment
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
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.This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.