Weber 44 IDF Question Options

[orbit398]

Just looking to see if someone can help pin point an issue I am having – assume it’s a carb issue.

Here is what I have: 2.0 liter with flat top pistons (euro style), has ~160 psi on all cylinders, carb cam, bursch exhaust, dual Weber 44 IDF carb set up, idle jet = 55, main jet = 145, F11 emulsion tube, 200 air correction. Carbs are synced and pull the same at idle as well as about 1500. I live in Houston (sea level).

I have read and followed several write-ups on tuning the Weber carbs. Overall, the car runs great above about 2200 rpm. It idles excellent.

Issue: Still getting the occasional popping. More importantly, while under easy acceleration (throttle slightly opened/just limping along in traffic) ~around 2000/2200 rpm, the engine seems to be missing or it shutters. If I open the throttle just a bit more, it disappears and runs great. I cannot replicate this by just revving the motor up in neutral; does this only under a load??

What could be the issue here? I plan to recheck synchronization/insure carbs pulling equally, spray carb cleaner/starter fluid to check for air leaks, try to ensure butterflies are opening equally. Just puzzled at what it could be.

[BigFour1973]

Thank you all for the responses, I'm a newbie to the Webber 44s. Although not a newbie to carburetors themselves so I get the principal.

I tweaked the mixture screw on #4 cylinder and got it to come back to life. Drove her over to the car wash a couple miles away and on my way back I lost cylinder #2. Same issue, except this time I could back the screw all the way out with the car running and there was no change. Screwed it all the way in and again, no change.

Spark notes:
All things noted below are issues at idle, off idle/transition to main.

- lost cylinder 4, messed with mixture screw and got it back to life
- lost cylinder 2, messed with mixture screw to no avail.

Could it be bad gas?
Could it be due to the desert climate that the car was parked in for the last 4 months gunking up the jets?

[Elliot Cannon]

Thank you all for the responses, I'm a newbie to the Webber 44s. Although not a newbie to carburetors themselves so I get the principal.

I tweaked the mixture screw on #4 cylinder and got it to come back to life. Drove her over to the car wash a couple miles away and on my way back I lost cylinder #2. Same issue, except this time I could back the screw all the way out with the car running and there was no change. Screwed it all the way in and again, no change.

Spark notes:
All things noted below are issues at idle, off idle/transition to main.

- lost cylinder 4, messed with mixture screw and got it back to life
- lost cylinder 2, messed with mixture screw to no avail.

Could it be bad gas?
Could it be due to the desert climate that the car was parked in for the last 4 months gunking up the jets?

After my car has set for a few months without running, the carbs will dry out resulting in clogged idle jets.