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The Skinner Union
Carburator....    De-mystified
The
Numbers		 Tuning vs
Adjusting SUs		 Twin HS4's vs
single ZS CD150		 Virtual
Tour		 The Fuel
Flow Path		 Physical
Dimensions 

     (and some DGV stuff too)

DCOE 45 (152)

The DCOE numbers....

    .....a project in process. data is in complete and constantly being updated.......

       From the eyes, ears, minds, and typing fingers of the members of the Triumph Spitfire e-mail List, The Editors of the Triumph Tune Catalog, with a special thanks to those people submitting photos and jetting info that makes these pages possible, I bring you a compilation of all the info I've been able to find concerning the initial setup of Weber DCOE carburetors for the 1500 Triumph Spitfire (and now others...post 11/99).

       There are many factors that can effect the initial settings that work best for you. They vary due to driving habits, various engine modifications, state on wear, etc ,etc.

       Get your hands on a copy of '               It covers dis-assembly and rebuild, tuning, and complete descriptions of all the sub-sections of the inner workings of the various SU carbs.

       The following tables are beginning settings only and are not the only combination of settings that might work for you.

This table I built from info found in books, internet sites, tech articles, and word of mouth.

Again...it's here as a reference only to possible/probable starting settings.
Well... presently the 1975 has the stock Zenieth Stromberg 150 on it. This comparison run will compare the operation to a pair of SU HS4's.
Well at the moment these numbers are working, mostly because this is what was in the '78 when I bought it. I am running a Kent Mild Road Cam. A Dial micrometer (during a valve adjustment) says my valves are opening(being pressed in) 0.340". The cam lift would have to be divided by whatever the rocker ratio is to define the actual cam lobe lift. ( I guess this is something else I need to look up.)

     Supplied to the manafacturers to be used as OEM carburation for each of the cars listed, this table shows the factory jetting info as configured as 'stock'.

Model                

style (or sub model #)

                

mfg. part number

                

Choke

                

Aux. Venturi

                

Main Jet

                

Emulsion Tube

                

Air Jet

                

pump jet

                

Idler jet

                

pump bleed

                

needle valve

                

float level

                
(intended use)                

     Conversion Kits

From Weber's own guides, the following table is a list of the standard jettings
      as supplied in their conversion kits. The kit #'s are also listed in the table.

Conversion
Kit
number		 application Carburetor
and
qty.		 Main
Venturi		 Aux.
Venturi		 Main
Jet		 Emulsion
tube		 Air
Corrector
Jet		 Idle
Jet		 Acc.
Pump
Jet		 Pump
Ex.
Valve
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     

   Photos of installations

To see what this all looks like, I've assembled a page with photos showing owner's installations. Where data was provided, I've included their state-of-tune, and jetting information for their setup.

  

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last edited 05/29/09
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