WEBER TUNING MANUAL PDF
EUROPEAN SPORT ENGINES FITTED WITH WEBER CARBURETORS. FERRARI GT. Page 4. Page 5. Page 6. Page 7. Page 8. Page 9. Page Page The Haynes. Weber. Carburetor. Manual by A K Legg LAE MIMI, Don Peers, . through theory, maintenance, overhaul and tuning, using only the nec-. Engine fuel and air feed systems. WEBER CARBURETOR ADJUSTMENT SETTINGS. 40 DCOE 2 carburetor – Adjustment setting example.
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I discovered ecogenenergy.info of the original Weber Tuning Manual from Bologna. Download here. Tuning of Weber carburetors. All Weber carburetors have four circuits. Idle. Cross -over. High Speed. Accelerator. Idle and Cross-over - These circuits are. Proper idle jets are very important to a Weber's performance (this assumes there is no vacuum leaks or other carb problems check here). Idle Speed Screw.
I want to support the FAQ! Original Weber Tuning Manual. January 15, I discovered this.
A listing of all the emulsion tubes and detailed sizes of holes etc. A bit of carb theory and other info.
I thought this might come in handy for anyone wanting to tune their own Weber. If you combine this with John Passini's excellent book - 'Weber Carburettors Tuning Tips and Techniques', you'll have a good base of reference to work from and of course experience from many hours fiddling and driving around cheers Geeom.
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Share this post Link to post Share on other sites. That looks pretty cool, thanks for posting. January 16, Nice, thank you.
Thanks for posting! Hi any chance you could post up the link to Dellortos, you can never have too much information. Thanks for the Weber info , cool. I second this! The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor.
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.
When doing multiple carburetors all linkage should be disconnected. All carbs should be bench adjusted to same setting. 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. This is not used for idle adjustment or idle quality.
The settings for these screws should be closed. Mixture Screw 1 turn out from lightly seated.
Weber S.P.A. Weber Carburatori. Tuning manual
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. The engine should start to smooth out. 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.
Now you may adjust the Idle Speed Screw. These carbs are commonly used in pairs, this makes the synchronization important, be sure to bring the high flowing carb down to the low flow carb.
IMPORTANT TECHNICAL ARTICLE....Jetting and Tuning Weber Carbs.
After synchronizing multiple carbs, reconfirm steps b.With tech support calibration and tuning parts will be available at discount pricing as well as access to technical support documents and mailings. If the speed screw has to be opened 2 or more turns then this is also an indication of a lean condition usually requiring greater change. This will increase the duration and volume of the pump shot with the original pump jets. If all is still best and smoothest idle then confirm and note the final settings.
The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. This is the reason that the Weber should give a fuel economy improvement over most factory carbs along with significant performance gains.
Now that the mixture screw is at its best running location, you can adjust the idle speed the screw. You want to tune the engine by sound.
Be sure for initial carburetor set up all air by-pass screws should be in closed position.
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