2100 CARB
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
WHAT SIZE ARE IN THERE NOW? IT'S VERY COMMON FOR PREVIOUS OWNERS TO MAKE CHANGES OVER THE YEARS. THE FORD TRUCK SHOP MANUAL WILL PROVE INVALUABLE FOR INFORMATION SUCH AS THIS.
KEEP IN MIND THE CORRECT POWER VALVE SIZE IS ALSO A CONSIDERATION. 1200 FEET SHOULD NOT TECHNICALLY REQUIRE ANY CHANGES FROM THE STOCK OEM COMPONENTS AS SPECIFIED, BUT THE STOCK SIZE JETS MAY RUN TOO RICH OR TOO LEAN DEPENDING ON YOUR APPLICATION.
KEEP IN MIND THE CORRECT POWER VALVE SIZE IS ALSO A CONSIDERATION. 1200 FEET SHOULD NOT TECHNICALLY REQUIRE ANY CHANGES FROM THE STOCK OEM COMPONENTS AS SPECIFIED, BUT THE STOCK SIZE JETS MAY RUN TOO RICH OR TOO LEAN DEPENDING ON YOUR APPLICATION.
Cargo Master
Joined: Nov 2009
Posts: 2,364
Likes: 117
From: starship enterprise
I don't know on a 2100 but my 2150s run 57 jets, 55 are too lean, now I would wonder since my 2100s seem to be slightly larger butterflys than my 2150 but that may or may not require larger jets. airbleeds and venture design effect this as well. I am at 6000 ft and my 2100s had 55 or 57 in them when dismantled, but you may very likely need a size or two on me, more air. I notice when I go up to 8000-9000 feet in the mountains, I don't even notice a rich condition.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Carb ID
Other numbers on the Side of Bowl & on the Base ?
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Good place to start. Was the truck issued with that particular 2100 carb though? The Shop manual has the carb size... and jet size for that engine.. with the OEM carb.. And Venturi size.. and booster cluster.. After 40 or 50 years no telling what's on there. I'd throw some 53s in it and go from there.
Logistics Pro
Joined: Dec 2003
Posts: 3,777
Likes: 863
From: Foothills of NC
I would run between 62-67, and probably settle on a 64. You may be suprised with better fuel mileage once carb and timing are adjusted, plus better cold start performance and power.
You are feeding a lot of cubic inches, with a very big intake to draw the fuel across.
You are feeding a lot of cubic inches, with a very big intake to draw the fuel across.
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