Weber 44 IDF Question |
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Weber 44 IDF Question |
orbit398 |
Nov 1 2016, 09:57 AM
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#1
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Member Group: Members Posts: 139 Joined: 29-April 15 From: League city, Texas Member No.: 18,681 Region Association: Southwest Region |
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. |
72hardtop |
Apr 24 2017, 04:54 AM
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#2
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Member Group: Members Posts: 120 Joined: 11-September 13 From: Seattle/HB Ca./Fujieda-Japan Member No.: 16,378 Region Association: Pacific Northwest |
With a 2L you'd be miles ahead with 40IDF's (better low RPM flow) than with the bigger throat 44's.
Jetting for a 2 liter with 40IDF's: 28mm vents 50 ildes 120-125 mains 180 air corrector jets F11 tubes Fuel pressure no more than 3.5lbs max And get your hands on an LM-2 Wide band |
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