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[Datsun 1200 encyclopedia]

Weber DCOE carburetor

Revision as of 20:49, 11 February 2013; view current revision
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Category: Fuel System

Weber DCOE sidedraft carburetor. The traditional racing carburetor.

Contents

Sizing

Proper sizing is important for good performance:

8114.jpg


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 size27
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 size33
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 size33
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 size32
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

Parts

Also see Intake Manifold

Kit includes manifold, carburetor, gaskets and linkage
[K110-2T.jpg

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
2xDCOE.jpg

Redline Weber linkage

Weber Kit
K206.jpg