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IECO JETTING FOR THE DUAL 45 DCOE'S-9 CARBS


WEBER 45 DCOE 9 IECO TUNING :

STREET USE

VENTURI SIZE (CHOKE)----32MM

AUXILIARY VENTURI-------4.5

EMULSION TUBE-------------F7

MAIN JET------------------------110

AIR CORRECTION JET----165

IDLE JET-------------------------F9/.50

PUMP JET------------------------.50

INLET VALVE WITH EXAUST-CLOSED

NEEDLE AND SEAT-----------200


 

OFF ROAD RACE USE;

NOTE SMALLER VENTURI SIZE WILL BREAKUP FUEL BETTER

VENTURI SIZE (CHOKE)--38MM     #228-038

                                               39MM     #228-039

                                               40MM     #228-040                   

UP TO 42MM # BUT NO PARTS ARE LISTED

AUXILIARY VENTURI---4.5     #241-450

EMULSION TUBE----------F2      #225-002

MAIN JET---------------------125     #220-125

AIR CORRECTION JET---165    #221-165

IDLE JET---------------------F9/.50    #209-050

PUMP JET--------------------.50         #222-050

INLET VALVE WITH EXAUST-CLOSED# 224-000

NEEDLE AND SEAT-------------200    #223-200

ABOVE PARTS IN RED ARE THE PARTS TO CHANGE FOR TRACK


PARTS PLACES:

WEBER USA http://www.webernorthamerica.com/

Weber 45 DCOE Carburetor

The Weber 45 DCOE is a two barrel high performance carburetor.
This is a popular carburetor for Weber conversions on
many different applications.
Weber Part Number 19600.060

 

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BOOKS WEBER

http://www.amazon.com/s/ref=nb_ss_b_2_7?url=search-alias%3Dstripbooks&field-keywords=weber+carburetor&sprefix=weber+c

TUNING

THE DCOE SERIES

With a Grand Prix Racing heritage, the venerable DCOE is Weber's primier Carburetor, and still the standard by which all other carburetors are measured. It is unsurpassed for full-race use, yet its infinite tunabilty by way of interchangable calirated parts allows it to be tailored to suit any engine and application. Hardly enough can be said about the DCOE. Its features include: ball bearing throttle shafts, pistion type accelerators pump circuits, a wide variety of throttle bore sizes.. and, of course, the excellence that is Weber.

DCOE Carburetors 

Low Speed Circuit Tuning

 

It is most important to verify all linkage and levers are installed without binding and the linkage opens to full throttle and is allowed to close to the Idle Speed Screw. This is the number one and two reasons for tuning errors, improper linkage installations and over tightened linkage nut, causing binding in the linkage assembly.

 The Individual Runner Carburetors, DCOE, have individual Idle jets and mixture screws for each barrel. They also have an additional air bleed screws and lock nuts. This is not used for idle adjustment or idle quality. The settings for these screws should be closed. 

 

Standard DCOE Settings:

Speed screw ¼ to ½ turn in after contact with lever maximum.

Mixture Screw 1 turn out from lightly seated.

 

“Lean Best Idle” Procedures

After confirming the linkage allows the throttle lever to seat against the Idle Speed Screw. Back off the Idle Speed Screw, then turn the screw in until it contacts the throttle lever and turn it in ½ turn. Turn in the Mixture Screw in until it “LIGHTLY” seats, then back it out 1 full turn. Loosen the 8mm wrench size nuts on the “air bleed” screws, turn in the air screws until it seats then tighten the nut.

a.      Start the engine, it will run slow and like a tractor. As long as it will stay running, the idle speed is not important at this point.

b.      First, turn in the mixture screw until the engine runs worse, then back out the screw ¼ turn at a time. The engine should start to smooth out. Continue to back the screw out ¼ turn at a time until the screw does nothing or runs worse. Then turn it back in to the point where it ran best. You want to tune the engine by sound. Adjust each mixture screw to the best, fastest and smoothest running point. Do this procedure with each mixture screw.

c.      Now you may adjust the Idle Speed Screw. It should be sensitive and only require ¼ turn in or out to achieve the idle speed you like.

d.      These Carburetors are commonly used in pairs, this makes the synchronization important, be sure to bring the high flowing Carburetor down to the low flow Carburetor. Then bring them both up to “proper” Idle speed. The Idle Speed Screws are not opened more than ½ turn in.

e.      After synchronizing multiple Carburetors, reconfirm steps b. c. & d.

 

“Simple Rules for Calibration”

If your mixture screw is out more than one turn like 11/2 turns then your idle jet is too lean, go up one half size on the Idle jet.

If you mixture screw is not out one full turn, something like only 1/2 turn out from seated then your Idle jet is too rich, go down one half size on the idle jet.

This is all based on the important fact that your speed screws are not open more than ½ turn if they are then that is also an indication that you have a lean Idle circuit. You are cheating by opening the throttle plates and exposing additional progression holes in the transition.

Pump By-pass Valve:

The pump by-pass valve is designed to allow fuel into the pump circuit and when depressed, by-pass a percentage (hole on the side of the valve) of the fuel delivered to the accelerator pump nozzle/jets. We have included the zero by-pass valve in our jet kit. This will deliver all of the available fuel to the engine and not by-pass fuel back to the fuel bowl. This will increase the duration and volume of the pump shot with the original pump jets. To decrease the duration and increase the fuel volume we have included in our jet kit the larger 55 pump nozzle/jets. This is for maximum fuel delivery from the accelerator pump circuit. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor.

 

DCOE Adjustment controls      Tuning & Adjustment

    1.      Critical! Be sure for initial carburetor set up all air by-pass screws should be in closed position. These are not commonly used in standard carburetor adjustment.

    2.      Set the idle speed screw at ¼ to ½ turn in after contact with throttle lever. When doing multiple carburetors all linkage should be disconnected. All Carburetors should be bench adjusted to same setting.

    3.      Set the idle mixture screw to one turn out form lightly seated. When checking the seated position to make only light contact with seat, aggressive seating will damage needle and seat of carburetor,

4.      Start engine as long as engine starts and runs do not set up idle speed first. First adjustment if possible should be to find smoothest idle with each mixture screw on all carburetors. Some prefer to do one barrel of each carburetor then come back and do the second barrel

5.    After preliminary lean best setting of idle. Check carburetors for synchronization. Commonly done by checking lead or front barrel of each carburetor.

6.    You will always want to bring high flow carburetor down to match the low flow carburetor. If this cannot be done you will need to recheck bench assembly for binding throttle in high flow Carburetor. Once you have matched both carburetors you will need to set the idle to the desired idle speed setting. This will be done by adjusting both Carburetors up or down the same amount and re checking for synchronization.

7.    Make one last check of lean best (smoothest running position) idle on all mixture screws one last time.

8.    Best idle should end up with the mixture screws at or near one turn off seat. Check rule of thumb for idle jet selection in REDLINE basic idle adjustment instruction.


DCOE Inter connecting linkage Installation guide and linkage assembly

Part No. 99006-110
NOTES
  1. You will need to install levers on carburetors before installing them on manifold.
  2. You have a choice of two lever styles be sure to determine how you want to connect cable to linkage. If you do not have a ball socket style cable then you will need to drill out (remove) ball from lever. Use part 99005 357-cable holder in place of ball.
  3. Be sure to use caution when installing levers, DO NOT OVERTIGHTEN CARBURETOR THROTTLE SHAFT NUTS this will cause binding of shaft and possibly damage to the throttle plates and the body of carburetor.
  4. Install cable support bracket to 4 screws on bottom of carburetor body (fuel chamber). Install on the same carburetor with the Pulling lever (male lever).
  5. Run exposed cable through cable housing support bracket and to your pulling lever on carburetor. Remember you have three hook up options.

WEBER CARBURETORS

40-45 DCOE (Typical)

19550-174  40 DCOE

19600-060  45 DCOE

Float Settings 
Early Style brass float 8 to 8.5mm (at radius)
Late style plastic float 12.5 to 13mm at extreme tip of float
All settings are gasket to float

 

Float setting notes
1. Fuel pressure is critical to float spillage 2.5 to 3 lbs.
2. For aggressive off-road use float drop should be limited to 1 to 1.5 mm max drop of tap for float needle
Down load hi-res version
KEY CALIBRATED PARTS
8) 79503-xxx Needle & Seat
9) 41030-005 Brass Float (early style)
9) 41030-034 Nitrofil Float (late style)
15) 73401-xxx Main fuel Jet
11) 77401-xxx Main Air corrector Jet
16) xxxxx-xxx Idle Jet Idle jet has both a size and  f number designation call for part no
57) 76801-xxx Accelerator pump Jet
43) 79701-xxx  Accelerator by-pass Jet
 

The Part Number for the Jets with .xxx after the part number means this is the size you want.

The sizes are all 3 digit. If you want a 120 main it is .120   If you want a 50 Idle it is .050

See Exploded Diagrams of each carb for more detail:
Baseline jetting of new Weber carbs when they are shipped from us.

  DCOE
Main Jets
73401.xxx
 
Air Jets

77401.xxx

 
Idle Jets
F8 or F9
F8 74821.xxx
F9 74822.xxx
 
Emulsion Tubes
61450.xxx
 
Choke Tubes 40mm 72302.xxx
45mm 72116.xxx
 
Aux Venturis See Diagrams
Pump Bleeds 79701.xxx
 
Pump Jets
76801.xxx
 
Needle and Seats 79503.xxx
 
   
 

Filter Assembly # Dimensions / Part #
99217.472 4.5"x 6.75" x 1.875" High
Replacement Element 99400.291
Replacement Clips 99217.001S
 
   
99217.473 4.5" x 6.75" x 2.625" High
Replacement Element 99400.292
Replacement Clips 99217.000S
 

 

DCOE Series Carbs. 40mm - 45mm - 48mm

Filter Assembly # Dimensions / Part #
99217.517 4.5"x 6.875" x 1.75" High
 
   
99217.525 4.5" x 6.875" x 2.5" High
 
99217.532 4.5" x 6.875" x 3.25" High
 
 
40 and 45 DCOE Clamp On Velocity Stack Filters
45 DCOE and 48 IDA Snap On Velocity Stack Screen Filters
RamFlo Style AIr Filters for DCOE and DGEV
    
For 40 DCOE and 45 DCOE
 

 
 

 

 

 

 

 


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