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Old 01-28-2009, 05:36 AM
albanycobra's Avatar
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Join Date: Mar 2005
Location: Perth, wa
Cobra Make, Engine: Pace Alumina 427 #69
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Ok Here's the latest on my Weber saga.....

We cleaned out carbies found one blocked idle jet, Refitted everything
and still a major difference in carby response......anyway we decided to ignore setting idle screws to the same amount of turns and set each cylinder untill it picked up. Some cylinders needed only a turn and a half others needed nearly 3 turns but all cylinders where finally firing and the engine is idling as smooth as stocker should. We decided to drive the car and see what would happen.

Out on the road under light load we could here the carbs coughing back or sneezing through the intake. The car drove really well, if you put your foot down the engine will rev all the way to 5500rpm smoothly and with out hesitation or back firing / sneezing, Stamping on and off the throttle was awesome with no flat spots. What a great noise.

So all I need to do is sort the low speed/light load sneezing and the engine tune is sorted.

I think I need to go richer with the idle jets but when you hold the throttle open and the engine free revs at approx 1200rpm the exhaust makes a popping noise which indicates rich.
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