Weber DCOE carburetor

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Revision as of 23:35, 28 March 2013

Weber DCOE sidedraft carburetor. The traditional racing carburetor.

Sizing

Proper sizing is important for good performance:

For a 1200cc engine at 6000 rpm, it looks like a 26mm venturi is called for, based on this chart and interpolating for 6000 rpm based on the DCOE chart.

Now, looking at the A12 specs, it seems Nissan used the same logic: A12 venturi: 26 mm

See main article: Carburetor Sizing

Jetting

For baseline tuning, follow the recommended jetting from a Haynes Weber carburetor manual, or another Weber book.

I borrowed an excellent book from the library: Weber Carburetors Owners Workshop Manual by Haynes UK. Amazon.com link). It has this in the back. The B210 specs should be a good starting point for a stock A14.

Conversion equipment jet setting Datsun B110 (A12) - single 40 DCOE 2

Choke size	27
Aux. venturi	4-5
Main jet	1-10
Emulsion tube	F7
Air corrector jet	1-65
Idle jet	0-50 F9
Accel. pump jet	0-50
Accel. pump inlet valve with ex. orifice	0-50
Needle valve	2-00

Datsun B210 & F10 (A14) - single 40 DCOE 2

Choke size	33
Aux. venturi	4-5
Main jet	1-30
Emulsion tube	F11
Air corrector jet	1-80
Idle jet	0-50 F8
Accel. pump jet	0-60
Accel. pump inlet valve with ex. orifice	closed
Needle valve	2-00

Datsun 510 (L16) - single 45 DCOE 13

Choke size	33
Aux. venturi	4-5
Main jet	1-30
Emulsion tube	F16
Air corrector jet	1-90
Idle jet	0-50 F8
Accel. pump jet	0-50
Accel. pump inlet valve with ex. orifice	0-55
Needle valve	2-25

Datsun 510 (L16) - dual 45 DCOE 12

Choke size	32
Aux. venturi	4-5
Main jet	1-35
Emulsion tube	F15
Air corrector jet	1-70
Idle jet	0-55 F2
Accel. pump jet	0-40
Accel. pump inlet valve with ex. orifice	0-55
Needle valve	2-00u

Also see discussion Help????? tunning Weber 40 DCOE on a14

40 DCOE-151 redline #19550.174 baseline jetting
32 Venturis
4.5 Aux venturis
115 Main jets
F11 emulsion tubes
200 Air correction jets
45F9 Idle tubes
40 Pump jet
50 Pump exh
1.75 Needle valve

huicho: SINGLE 40 DCOE ON A STOCK A15 ROUND PORT
COMPLETELY STOCK A15 economy version(round port head)
Main Venturi 32
Aux. Venturi 4-5
Main Jet 140
Emulsion Tube F-11
Air Corrector Jet 200
Accel. Pump Jet 60
Accel.Pump Inlet Valve with Ex. Orifice closed
Needle Valve 200
Idle Jet 55F9. 
If you do not use an air filter:
* 180 on the air correctors 
* 130 on the main jets

Parts

Also see Intake Manifold

Kit includes manifold, carburetor, gaskets and linkage
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Weber K110 A12 twin DCOE Pierce Manifolds $1200

Weber K625 A14 single DCOE

* Pierce Manifolds $575
* Alamo $548

Linkage

Linkage depends on the manifold you use.

Twin-Pull with cannon small-diameter rod

Redline Weber linkage

Weber Kit