Edelbrock PERFORMER Serie Instrucciones De Instalación página 7

IMPORTANT WARNING BEFORE STARTING THE ENGINE
Make sure to read the following before starting the engine .
• Be sure all vacuum lines are properly connected. Be sure to install
appropriate fitting in 1/4" Vacuum opening at rear of carburetor, or
plug with 1/4" NPT plug supplied.
• Check for signs of flooding before operating vehicle. If flooding
occurs, see "If You Have a Problem" section on Page #9.
• Do not pump the accelerator more than two or three times with
the engine off. This will cause fuel to collect on the throttle shaft
and may cause flooding.
13.
Start engine and check for fuel or vacuum leaks. With engine at
normal operating temperature and the choke fully open, set idle speed
and mixture screws (See "Idle Mixture" Section).
CAUTION: Be alert of carburetor flooding when fuel is first applied.
Flooding can be caused by dirt, small particles from hose cutting,
floats and inlet needles which have settled during shipping, or by
other conditions as discussed below. Each Edelbrock carburetor is
flow tested in the factory for both air and liquid flow so flooding is rare.
However, for safety sake please observe this caution. When the fuel
pump is turned on or when the engine is first started, watch closely for
signs of flooding. If flooding is apparent, tap the body of the carburetor
lightly with a rawhide mallet or the wooden handle of a small hammer.
If flooding continues, pinch the fuel line hose to shut off flow, run
the engine to clear the carburetor, and let the fuel line flow again. If
flooding still continues, shut off the engine. Clean up any raw gasoline
and refer to the "Trouble Shooting" section on page 9.
WARNING: Never pour fuel directly down the carburetor when
attempting to start the engine! This may cause a backfire and
possible engine compartment fire, resulting in engine or vehicle
damage, personal injury, and/or death.
14.
When restarting the vehicle, after it has been sitting for 10-30
minutes, you may experience some difficulty starting. The result will
be similar to a flooded carburetor. To help eliminate or minimize this
issue, the use of an Edelbrock Heat Insulator Gasket Part Number 9266
(sold separately) is highly recommended. For additional heat insulator
selections please visit www.edelbrock.com.
IDLE MIXTURE
The Edelbrock Performer and Thunder Series AVS carburetors have
conventional Idle Mixture Screws (IMS) that provide a leaner A/F when
turned clockwise and richer A/F when turned counter clockwise. The
idle air flow is controlled by a conventional screw that opens the Primary
Throttles. The following procedure should be used to set the idle
mixture and speeds.
1. Fully warm engine and ensure choke is fully open.
2. Air cleaner in place.
3. Set desired speed with the idle speed screw.
4. Adjust the IMS on ONE side to get the maximum possible RPM.
Do not go rich beyond the maximum speed point.
5. If the above changed the idle speed more than 40 RPM, then
readjust the speed.
6. Adjust the side OPPOSITE of that in Step 4 to get maximum
RPM.
7. Reset the speed.
Performer and Thunder Series AVS Carburetors
Rev. 10/08/13 - QT/mc
8. Carefully trim each IMS to again get the maximum idle RPM.
9. Go leaner just enough to get a 20 RPM drop in speed.
10. Reset the speed to the desired RPM.
11. This is a Lean-Best Idle Set. Setting richer than this will not
improve idle quality or performance, but could tend to foul
plugs.
LONG DURATION CAMSHAFT
If the engine has a fairly radical camshaft it may require an excessive
amount of throttle opening for idle and/or have low idle vacuum levels.
Either condition can lead to poor levels of adjustability and erratic idles.
Another fix for the above condition is to run as much spark advance as
possible at idle. If the distributor is fitted with a vacuum advance unit,
connect it directly to manifold vacuum. If you are not able to employ
vacuum advance for some reason, then the mechanical curve should
have a low limit, which will allow you to use plenty of initial spark
advance.
ADJUSTING THE AIR VALVE SECONDARY
(Thunder Series AVS Carburetors Only)
1.
With Torx drive (T15) and flat blade screw driver in place, loosen
Torx screw, make sure flat blade is secure to prevent loss of spring
pressure (See Fig 12).
Torx
Flat Blade
2.
If you lose spring pressure, turn flat blade screw counter-clockwise
until the air valve just reaches the closed position, plus an additional
1-1/2 turn to achieve the factory setting.
NOTE: Turn only 1 full turn beyond closed position for 1803/1804
factory setting. For single carb applications, set 1803/1804 carburetors
to 1-1/2 turns past closed position.
3.
The factory setting is the most common setting. If additional tuning
is required, turn the air valve screw counter-clockwise to make the air
valve open later, it is not recommend to go beyond one turn more than
the factory setting, or more than 2-1/2 turns past the closed position.
Page 7
Fig. 12
©2013 Edelbrock LLC
Brochure #63-0061