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 picscobenreatttas.tk 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.
Cycle the linkage again to be sure that the linkage comes to close without any assistance. Set the mixture screw see Fig 1 by first screwing in until the screw stops, bottoms out.
Weber Carburetor Tuning Manual
Back out the screw 2 full turns. Start the engine, the engine will run very slowly more like a tractor. As long as the engine stays running idle speed is not important at this point. The first thing to do is not set up the idle speed, but to set the idle mixture screw to lean best idle setting.
The engine should pick up speed and begin to smooth out. Use your ear, not a scope or tuning instruments at this point.
You want to tune the engine by sound. Adjust to best, fastest and smoothest running point. Now that the mixture screw is at its best running location, you can adjust the idle speed the screw. Check and set idle to your driving preference. Put the car in gear and apply slight load, AC on and set the Idle as you like it. Recheck timing and vacuum hook ups. Recheck mixture screw to lean best idle again.
If all is still best and smoothest idle then confirm and note the final settings. To confirm settings with the engine running. Start by screwing in the mixture screw and count the number of turns it takes to bottom out and note if the engine dies.
Also check the speed screw and note how many total turns from initial contact. You may have opened turned in the speed screw.
More Tuning & Adjustment
Your final setting should be under 2 full turns. Reset the screws back in to the best final settings Per your notes and go on a test drive and have fun.
If the settings are other than described then you may want to recalibrate the idle circuit low speed circuit to your engines needs. Simple Rules for low speed calibration If the mixture screw is more than 2 turns out then the idle jet is too lean too small. Start the engine, it will run slow and like a tractor.
IMPORTANT TECHNICAL ARTICLE....Jetting and Tuning Weber Carbs.
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.
After synchronizing multiple carbs, reconfirm steps b.
You are cheating by opening the throttle plates and exposing additional progression holes in the transition. We have included the zero by-pass valve in our jet kit. This will deliver all of the available fuel to the engine and not by-pass fuel back to the fuel bowl. This will increase the duration and volume of the pump shot with the original pump jets.
This is for maximum fuel delivery from the accelerator pump circuit. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. Most Critical! 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.Check and set idle to your driving preference.
Check carburetors for synchronization. Check and set idle to your driving preference.
Technical assistance is free for the first 60 days of download. Set the idle mixture screw to one turn out form lightly seated. Some prefer to do one barrel of each carburetor then come back and do the second barrel 5.
You are cheating by opening the throttle plates and exposing additional progression holes in the transition. Mixture Screw 1 turn out from lightly seated. The engine should start to smooth out.
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