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914World.com _ 914World Garage _ Jets are too small, how do I replace?
Posted by: ronan Dec 31 2022, 02:17 PM
I just bought a 1975 1.8L, with dual weber 40mm carbs. The car was in an elevation of 7000 feet, but I live at 1300 feet, so it runs lean and dies when it tries to idle. Does anyone know about how difficult it is to replace the jets for my elevation? What is the proper size of jet? Any videos of how to do this?
Posted by: 930cabman Dec 31 2022, 05:44 PM
Was the engine running good at the higher elevation? I would not assume the jets are incorrect. Could be plugs, spark timing, clogged jets, .....
Have you checked the AFR with an accurate gauge?
Posted by: 914043 Dec 31 2022, 07:17 PM
I just bought a 1975 1.8L, with dual weber 40mm carbs. The car was in an elevation of 7000 feet, but I live at 1300 feet, so it runs lean and dies when it tries to idle. Does anyone know about how difficult it is to replace the jets for my elevation? What is the proper size of jet? Any videos of how to do this?
Go to Piercemanifold.com Much info about Weber carbs. you wont be sorry
Posted by: stownsen914 Jan 1 2023, 10:37 AM
Below is a pic of Webers. The jet stacks are the tall brass things between the air intake stacks. They unscrew, and the jets are assembled in a stack. Here's a http://www.914world.com/bbs2/index.php?showtopic=101860 from right here on the forum showing/describing how to disassemble the jet stacks.
Posted by: slivel Jan 1 2023, 12:08 PM
Elevation makes a big difference in performance especially with carbs. From sea level tracks to Miller Motorsports near Salt Lake the change in elevation required one or two sizes smaller main jets for my car depending on air temperature/density.
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