Dual carb question, Dellorto 40s on a 1.8L to be exact |
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Dual carb question, Dellorto 40s on a 1.8L to be exact |
terrymason |
Jul 14 2007, 07:00 PM
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#1
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Member Group: Members Posts: 346 Joined: 23-November 05 From: Virginia Beach Member No.: 5,174 |
The problem - The car will go very lean around 2500 rpm, as if the pump jets were too small.
History: New fuel pump (3.5 PSI to each carb) 55 idle jets 55 pump jets 140 main jets 175 air correctors These carbs are new to the car, and I'm trying to dial them in. The car is lean when I first start it (16 / 17 on my air / fuel gauge), but then levels out to a nice 14.7 idle when warmed up. While driving, I can give the car 20% or so of the pedal, and drive up to highway speeds nicely, but when I goose it, it will go very lean (18-22 on my gauge) followed by a series of backfires and loss of power. I started off with 35 pump jets, and have moved up to 55s, which appear to be the most popular around here. I've also adjusted the pump jet linkage, from the nut fully loosened, and moved it in as far as it would go before affecting the main throttle shaft (like 60 turns or something). What do you guys think, do I need 75 pump jets? |
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