Re: Xeber concern
Posted: Sun Jun 17, 2018 5:54 pm
Esprit2
I thought the main circuit started taking affect as low as 1500 RPM's. This would be at odds with your quotes below. I guess I have to read through my Weber books again.
"50F8 is the combined Idle Jet (50), and the Idle Air Corrector (F8). The Idle Circuit feeds the engine up to 4000 rpm, then hands off to the Main Circuit. When you get the engine running, do the following tests to evaluate the Idle jets:
Take the car for a drive on a road that has little traffic, and make a full throttle acceleration run in an intermediate gear... 2nd or 3rd (you'll rip through 1st too quickly to be helpful, and 4th will just get you a speeding ticket). If the engine stumbles approaching 4000 rpm, then the Idle Jet is too lean. Go richer until the stumble 'just' disappears, no further. If the engine doesn't stumble on the first run, then you can't be certain if the Idle Jet is correct, or too rich. So go leaner until a stumble just becomes apparent, then go back a step richer until the stumble just disappears.
The Idle Jet and Idle Air Corrector affect one another. So if you do end up having to make a change to the Idle Jet, then go back and re-check the Idle Air Corrector once again. Adjust the Idle Air Corrector for off-idle hesitation, and the Idle Jet for a full throttle stumble at around 4000 rpm."
I thought the main circuit started taking affect as low as 1500 RPM's. This would be at odds with your quotes below. I guess I have to read through my Weber books again.
"50F8 is the combined Idle Jet (50), and the Idle Air Corrector (F8). The Idle Circuit feeds the engine up to 4000 rpm, then hands off to the Main Circuit. When you get the engine running, do the following tests to evaluate the Idle jets:
Take the car for a drive on a road that has little traffic, and make a full throttle acceleration run in an intermediate gear... 2nd or 3rd (you'll rip through 1st too quickly to be helpful, and 4th will just get you a speeding ticket). If the engine stumbles approaching 4000 rpm, then the Idle Jet is too lean. Go richer until the stumble 'just' disappears, no further. If the engine doesn't stumble on the first run, then you can't be certain if the Idle Jet is correct, or too rich. So go leaner until a stumble just becomes apparent, then go back a step richer until the stumble just disappears.
The Idle Jet and Idle Air Corrector affect one another. So if you do end up having to make a change to the Idle Jet, then go back and re-check the Idle Air Corrector once again. Adjust the Idle Air Corrector for off-idle hesitation, and the Idle Jet for a full throttle stumble at around 4000 rpm."