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| For a 1200cc engine at 6000 rpm, it looks like a 26mm secondary venturi is called for, based on this chart and interpolating for 6000 rpm based on the DCOE chart. | For a 1200cc engine at 6000 rpm, it looks like a 26mm secondary venturi is called for, based on this chart and interpolating for 6000 rpm based on the DCOE chart. | ||
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| A12 secondary venturi: 26 mm | A12 secondary venturi: 26 mm | ||
| + | See main article: [[Carburetor Sizing]] | ||
| == Jetting == | == Jetting == | ||
Revision as of 23:31, 17 January 2009
Weber DCOE carburetor.
Sizing
Proper sizing is important for good performance:
For a 1200cc engine at 6000 rpm, it looks like a 26mm secondary 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 secondary 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 2Datsun B210 & F10 (A14) - 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 510 (L16) - single 45 DCOE 13
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) - dual 45 DCOE 12
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
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