Jets
New User
Joined: Feb 2004
Posts: 21
Likes: 0
From: Tri-Cities, WA
Also, to go from elevation (Denver) to sea level, would you increase jet size or decrease? My 77 F-150, 400, is running pretty rich at 300 ft.
Last edited by sdkoz; Dec 14, 2004 at 11:32 AM. Reason: duplicate
Laughing Gas
Joined: Jul 1999
Posts: 1,047
Likes: 22
From: Lacey, WA
sdkoz,
The 1850 carb does not have jets in the secondaries. It has a metering plate with holes drilled into it that serve the same purpose as jets. 134-9 is the number of the plate.
The air at sea level is "thicker" than the air at the Mile high city, so at sea level you would run leaner and your carb would require jetting up to compensate. Now this does not go along with you saying your running rich at 300 ft. You should be running lean. Hum?
Lee
The 1850 carb does not have jets in the secondaries. It has a metering plate with holes drilled into it that serve the same purpose as jets. 134-9 is the number of the plate.
The air at sea level is "thicker" than the air at the Mile high city, so at sea level you would run leaner and your carb would require jetting up to compensate. Now this does not go along with you saying your running rich at 300 ft. You should be running lean. Hum?
Lee
New User
Joined: Feb 2004
Posts: 21
Likes: 0
From: Tri-Cities, WA
That was one of those questions that after you ask, you go, "Duh." If running rich (and nothing else is messed up), you'd jet down. It was running rich in Denver (and has been for some time even before the carb needed work) and the carb needed rebuilding, which I just finished. I dropped down 3 jet sizes on the primary (66 to 63). Don't have a feel for whether that is too much so I'll find out tonight if I am able to work on it. If so, I'll try again.
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