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Setup for single Weber carb

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J

jorg

Freshman Member
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Hallo,
I am new here in this Forum and have a question about the carb setup for a 1977 1500 Midget. (In order to reach the Spitfire owners I posted at the Triumph-Forum too.)

Does anybody know what the basic setup for a single Weber DCOE 45 for a standard 1500 engine is? The car should mostly run under normal conditions with rpm between 1500-5000 with intention on maximum fuel economy and less power output above 6000 rpm.

The following basic setups for a single Weber DCOE 45 I found on the internet:

Choke 33
Aux. Venturi 4.5
Main Jet 190
Emulsion Tube F9
Air Jet 175
Pump 40
Idler Jet 45F9

Choke 34
Aux. Venturi 3.5
Main Jet 150
Emulsion Tube F2
Air Jet 175
Pump 50
Idler Jet 55F8
Accel. pump (jet) 50
Ex.Valve 50

Choke 34
Aux. Venturi 4.5
Main Jet 145
Emulsion Tube F16
Air Jet 155
Pump 45
Idler Jet 55F8
Ex.Valve 40

Thanks
Jörg
Germany
 
Wilkommen Jorg,

I can't help you with the Weber carb, but someone here will chime in with the information you seek.

Just want to welcome you to the sickness.

Joel
 
This a kinda black art. There is a book. Weber Carburators. Read it carefully. Most important (here is a hint)to under stand that the idle jet affects the fuel mix across the rev range. After reading the book(focus on DCOE section) Follow the graphs in the front of the book based on cylinders, engine size and rpm. Do the math and you will be close...very close. No guess work. If you do this you will know for sure what the setting should be. The last one you listed looks pretty good, but you would do better to do the leg work. You will be glad you did and you won't be relying on others guess work. No engine is the same as another.
 
Hello Jorg,

unless you have a Weber fitted already, you will not improve on the original carburettors for driveability and economy. The Weber DCOE is primarily a performance carburettor.

Alec
 
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