Edelbrock 1801 User's Manual
Contents
1. Fuel Line Kit 8135 installed on stock steel fuel line Cut stock fuel line add 8135 ferrule geg Neoprene Hose Stock Steel Fuel Line to Carburetor Fig 3 Part 1801 1806 1812 1813 1825 1826 Rev 6 10 AJ mc Always use a new fuel filter Failure to do so will void the warranty Edelbrock Adapter 2696 or Adapter Fuel Line Kit 2697 must be used when installing a Thunder Series Carburetor on a General Motors Quadrajet or Chrysler Thermoquad manifold 2697 includes Adapter 2696 and Fuel Line Kit 8135 See Fig 4 Quadrajet Adapter Kit 2697 Do not use an open adapter Fig 4 You must use an Edelbrock Adapter 2732 when installing a Thunder Series Carb on some Edelbrock manifolds See Fig 5 Refer to the instructions included with the manifold for details Square Bore Adapter Plate 2732 Gasket Manifold Fig 5 Do not use more than 6 5 psi fuel pressure Excessive fuel pressure may cause flooding If your fuel pressure is too high install an adjustable pressure regulator such as Edelbrock 8190 or 1727 It may be necessary to re route the fuel line to prevent interference with the air cleaner Test fit your air cleaner on your new carburetor before you begin installation Look for areas of interference such as the choke housing fuel inlet fitting and fuel line THUNDER SERIES CARBURETOR INSPECTION 1 2 3 Page 3 of 6 Check for possible2. Fuel Line Kit 8134 Dual Feed Line f Q Carburetor adapter for other than square bore intake manifolds 8132 Dual Feed Line with blue filter 8133 or Dual Feed Line with Do not use a EL to 2 bbl adapter tiea carbs must be used polished filter 8128 on intake manifolds designed for 4 bbl carburetor only L Banjo Fuel Fitting 8089 if required for fuel line clearance Q Throttle cable transmission and cruise control bracket 8031 for Q New Air Cleaner Edelbrock 1221 or 4221 recommended small block and big block Chevy or 8032 for small block Chevy Q Air cleaner spacer 8092 3 4 If using stock air cleaner with Vortec and E Tec intakes Other applications may require i P 9 4 Eusing i modification to original throttle cable bracket Q Choke cable kit manual choke carburetors f emang i Q Universal throttle return spring kit 8005 If original return spring Q Throttle Linkage Kits for Ford or Chrysler applications see cannot be used Carburetor Preparation section Step 1 INSTALLATION PROCEDURE FUEL INLET For 3 8 hose Dual fuel inlets are IDLE MIXTURE SCREWS AVS ADJUSTMENT available Supplied installed on passenger side Left side screw for left side of carburetor See Page 4 May also be moved to driver side Right side screw for right side of carburetor PART NUMBER Stamped on pad at front of carburetor Except POWER BRAKE PORT EnduraShine models Rear of Carburetor 1 4 NPT MUST BE
3. PLUGGED WITH SUPPLIED 1 4 PIPE PLUG IF NOT IN USE lt _ IDLE SPEED SCREW MANIFOLD VACUUM PORT PCV PORT 3 16 Vacuum is present at idle TIMED VACUUM PORT For 3 8 hose 3 16 Vacuum is introduced off idle NOT FOR FUEL Figure 1 Fittings and Vacuum Port Location Part 1801 1806 1812 1813 1825 1826 2010 Edelbrock LLC Rev 6 10 AJ mc Page 2 of 6 Brochure 63 0170 BEFORE REMOVING OLD CARBURETOR 1 Determine if the distributor vacuum port is timed no vacuum at idle or full vacuum present at idle With the engine fully warmed up and idling pull the vacuum hose off of the carb and feel for vacuum by putting your finger on the vacuum port See Fig 2 If your distributor has timed vacuum advance hook the vacuum hose from the distributor to the passenger side vacuum port on the carburetor If it has full vacuum advance hook it up to the driver s side vacuum port The stock steel fuel line must be converted to either a fuel resistant rubber hose or one of the Edelbrock fuel line kits The stock steel fuel line will not connect to the Thunder Series Carburetors Use one of the Edelbrock Fuel Line and Filter Kits 8133 dual feed 8134 and 8135 as seen on the Edelbrock website or in the Edelbrock catalog See Fig 3 NOTE After cutting fuel line remove sharp edges and clean out any chips 8133 Dual Feed Fuel Line Kit 8134 Fuel Line Kit
4. EDELBROCK THUNDER SERIES AVS CARBURETORS Part 1801 1802 1803 1804 1805 1806 1812 1813 1825 1826 THUNRER 4 SERIES INSTALLATION INSTRUCTIONS PLEASE study these instructions carefully before beginning this installation Most installations can be accomplished with common tools and procedures However you should be familiar with and comfortable working on your vehicle If you do not feel comfortable performing this installation it is recommended to have the installation completed by a qualified mechanic If you have any questions please call our Technical Hotline at 1 800 416 8628 7 00 am 5 00 pm Pacific Standard Time Monday through Friday IMPORTANT NOTE Proper installation is the responsibility of the installer Improper installation will void your warranty and may result in poor performance and engine or vehicle damage DESCRIPTION Edelbrock Thunder Series AVS carburetors have been calibrated factory flow tested and preset These instructions also apply to carburetors featuring our EnduraShine finish Please read all instructions prior to installation For Theory of Operation and Tuning Procedures see the accompanying carburetor Owner s Manual These are non emissions carburetors check your local emissions laws ATTENTION EDELBROCK CARBURETORS ARE NOT CALIBRATED FOR OR COMPATIBLE WITH ALCOHOL RACE FUEL OR E85 PUMP FUEL USE OF ALCOHOL OR E85 IN YOUR EDELBROCK CARBURETOR WILL DAMAGE YOUR CARBURETOR AND VOID YO
5. Fig 10 Banjo Fuel Fitting 8089 2010 Edelbrock LLC Brochure 63 0170 10 Mark air cleaner stud for proper length remove from carburetor and ADJUSTING THE AIR VALVE SECONDARY cut with hack saw Deburr stud and re install in carburetor See 1 With Torx drive T15 and flat blade screw driver in place loosen Fig 11 Torx screw make sure flat blade is secure to prevent loss of spring pressure See Fig 12 2 If you lose spring pressure turn flat blade screw counter clockwise until the air valve reaches closed position plus 1 1 2 turns to achieve the factory setting NOTE Turn only 7 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 Torx Flat Blade 11 Re check all linkage for smooth operation 12 Re connect the negative battery cable to the battery 13 Start the engine and check for fuel or vacuum leaks With engine at normal operating temperature and choke fully open set idle speed and mixture screws see carburetor Owner s Manual CAUTION Be alert to carburetor flooding Flooding can be caused by dir
6. UR WARRANTY THESE FUELS CAN ALSO DAMAGE OTHER FUEL SYSTEM COMPONENTS UNLESS SPECIFICALLY DESIGNED FOR USE WITH ALCOHOL FUELS NOTE Edelbrock Thunder Series carburetors are not for computer controlled applications That includes some 1981 amp later GM vehicles with Q Jet carburetor and some 1981 amp later Ford vehicles with automatic overdrive AOD transmissions SPECIAL NOTE 1803 amp 1804 These 500 CFM carburetors are calibrated for out of the box performance on dual quad applications ONLY For single carb applications you should use carburetor 1801 or 1802 If you already have carburetor 1803 or 1804 you can recalibrate the carburetor prior to use Calibration Kit 1486 contains all jets and rods necessary to recalibrate 1803 or 1804 carburetors Edelbrock has found the following to be a good starting point for most performance applications requiring a 500 CFM carburetor Primary Jet 086 Factory setting Primary metering rod 065 x 052 1460 Secondary Jet 095 1426 Air Valve Secondary Setting 1 1 2 Turns See Fig 12 Page 6 KIT CONTENTS Q1 Installation instruction sheet Q1 1 4 NPT pipe plug Q1 Owners Manual Q1 Throttle cable ball end stud Q1 Warranty card Q1 10 32 Hex nut 11 Square bore base gasket Q1 3 16 Internal star washer Q1 Air horn gasket Q1 Red choke positive wire Electric choke carburetors only Q1 Air cleaner stud Q1 Black choke ground wire Electric choke carburetors only Q2 5 32 Vacuum
7. caps Q4 5 16 SAE flat washers EnduraShine finish only Q1 5 32 Vacuum T CHECK THE FOLLOWING BEFORE BEGINNING INSTALLATION WARNING WHEN WORKING AROUND GASOLINE ALWAYS WORK IN A WELL VENTILATED AREA AND KEEP ALL OPEN FLAMES SPARKS AND OTHER SOURCES OF IGNITION AWAY FROM THE WORK AREA FAILURE TO DO SO CAN RESULT IN A FIRE OR EXPLOSION Q Replace fuel filter Dirt i e corrision residue or other debris OQ Check fuel pump for proper operation and replace if necessary found in carburetor voids warranty Q Check the intake manifold and cylinder head gaskets for leaks and Q Check and replace the air filter if necessary replace if necessary Q Check PCV valve and replace if clogged Q Check the ignition system clean and gap or replace spark plugs Q Check all hoses for leaks or cracks and replace if necessary plug wires and adjust ignition timing Part 1801 1806 1812 1813 1825 1826 2010 Edelbrock LLC Rev 6 10 Ad mc Page 1 of 6 Brochure 63 0170 RECOMMENDED TOOLS Q Sockets wrenches tubing wrenches Q 20 Torx Driver for electric choke models QO Pliers Q Wire crimpers for electric choke models Q Screwdrivers Q Test Meter or Test Light for electric choke models Q Hacksaw and or tubing cutter PARTS RECOMMENDED FOR INSTALLATION Q New Fuel Filter Edelbrock 8135 or equivalent or Fuel Line Filter Q Electrical connectors electric choke carburetors kit such as Chrome Steel
8. cket Fold the wire to double its thickness about one inch from one end Insert the wire in the choke lever hold choke blade in the wide open position and tighten cable clamp on folded end of wire Part 1801 1806 1812 1813 1825 1826 Rev 6 10 AJ mc Page 5 of 6 Manual choke cable and fuel line connection Connect all vacuum hoses to their proper location on carburetor See Fig 1 Replace hoses that appear brittle or cracked to prevent vacuum leaks Connect fuel line to carburetor Avoid contact with any sharp edges or areas of extreme heat NOTE Some late model Ford 460 engines are equipped with hot fuel bypass units It is necessary to replace the stock unit with Ford E3TZ9N176B with blue dot which has a 0 040 orifice Edelbrock idle compensator 8059 may be installed to raise idle speed during air conditioning compressor operation Install new air horn gasket and air cleaner stud supplied Install air cleaner making sure it does not contact linkage or fuel line and has proper hood clearance We recommend Edelbrock Pro Flo chrome air cleaner 1221 which is a 14 diameter open element air cleaner that is designed to fit all Edelbrock Thunder Series carburetors Extremely low profile air cleaners will not fit electric choke carburetor without air cleaner spacer 8092 due to choke and fuel line interference but will fit manual choke carburetor when used with 90 banjo fuel inlet fitting 8089 See
9. damage to carburetor Make sure all throttle linkages operate freely Ensure that all fuel inlet and vacuum ports are free from packing material 2010 Edelbrock LLC Brochure 63 0170 CARBURETOR REMOVAL 1 2 3 10 Prior to removal make sure that the engine is cool Disconnect negative battery cable from battery Remove air cleaner Be sure to carefully disconnect any hoses from the air cleaner and note their location for re installation You may want to mark them with masking tape for easy reference Disconnect throttle linkage kickdown linkage certain automatic transmission applications only cruise control if equipped and any return springs if present NOTE Check carefully for the precise location of all these linkages and return springs You may want to mark them with masking tape for easy reference Disconnect all wires tubes and hoses from carburetor and note their location NOTE There should be a maximum of one wire to the electric choke and one to the idle compensator solenoid If applicable Any other electrical wiring attached to your carburetor indicates a computer controlled engine and any Edelbrock carburetor will not function correctly on computer controlled applications Disconnect the heater tube from the choke housing if so equipped Edelbrock carburetor do not use the hot air style choke so this tube may be left disconnected with no problems If you want to cover this opening on a st
10. icular application Throttle stud is removable and must be installed in the proper location Chrysler vehicles with automatic transmission will require Throttle Lever Kit 1481 Ford vehicles with automatic transmission and cable linkage will require Throttle Lever Kit 1483 See Fig 6 and Throttle Cable Plate Kit 1490 for 289 302 1491 for 351 W 1493 for 351 C amp 351 M 400 or 1495 for 429 460 Ford Throttle Lever 1483 bolts on carb throttle arm Fig 6 2 Check and prepare carburetor for proper vacuum fitting installation EGR power brakes PCV distributor transmission etc using supplied vacuum caps T and hose when applicable If vacuum port at rear of carb is not used plug with the 1 4 pipe plug supplied On electric choke models See Fig 7 remove one choke housing retaining screw and install eyelet end of choke ground wire black to choke housing and reinstall screw Connect clip end of choke ground wire to negative spade terminal on choke housing Black Wire To Ground Carburetor Body Retaining Screws 3 y Red Wire To Key On 12V Source Not Coil or Alternator Fig 7 Page 4 of 6 2010 Edelbrock LLC Brochure 63 0170 CARBURETOR INSTALLATION 1 Remove rag from intake manifold and install new studs mounting gasket and adapters where applicable NOTE Do not use any cement glue or RTV sealant on gasket 2 Carefull
11. ock intake manifold you may be able to use the appropriate Edelbrock choke adapter plate 8901 for small block Chevrolets 8961 for big block Chevrolets 8951 for Oldsmobile V8s 8971 for 351 M 400 Fords 8981 for 351 W Fords Carefully remove fuel line from carburetor TAKE EXTREME CARE NOT TO SPILL ANY EXCESS FUEL Place a rag underneath the fuel line to absorb any spillage that may occur Certain models require two wrenches to remove the fuel line one to hold the fitting on the carburetor and the second to turn the fitting on the fuel line Use a tubing wrench to avoid rounding the tube fitting nut Remove mounting nuts or bolts and washers Be sure to put them where they won t fall into the intake manifold upon carburetor removal Remove carburetor being careful not to spill any dirt into the intake manifold Immediately place a clean rag into the manifold to keep foreign objects out Remove old mounting gasket and thoroughly clean mounting surface Compare old carb gasket to gasket included with new carburetor If there is a difference in bolt pattern or bore spacing an adapter will be required see Before Removing Old Carburetor section steps 4 amp 5 Part 1801 1806 1812 1813 1825 1826 Rev 6 10 AJ mc CARBURETOR PREPARATION 1 Compare throttle arm of your new carburetor with the old one to be sure that all required linkages will hook up Install proper throttle and transmission linkage for your part
12. t small particles of hose cuttings floats and inlet needles which have settled during shipping When the fuel pump is turned on or when the engine is first started watch closely for signs of flooding If flooding occurs turn engine off immediately and lightly tap on the side of the carburetor that is flooding in the rear needle and seat area with a rawhide mallet or wooden handle of a hammer Start engine and see if flooding continues if so refer to owner s manual 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 Edelbrock LLC 2700 California St Torrance CA 90503 Tech Line 800 416 8628 Office Line 310 781 2222 Part 1801 1806 1812 1813 1825 1826 2010 Edelbrock LLC Rev 6 10 AJ mc Page 6 of 6 Brochure 63 0170
13. y place new carburetor on gasket 3 Replace all mounting nuts and washers EnduraShine finish carburetors should use the supplied 5 16 flat washers under any other washers used Hand tighten with a short box end wrench alternating between diagonally opposed nuts CAUTION Overtightening may break carb base and void warranty Connect all throttle and transmission linkages and throttle return springs You may have to cut bend or modify your stock throttle cable brackets to fit the new carburetor or use GM 352279 See Fig 8 1972 78 small block Chevy V8s may use Edelbrock Throttle Transmission and Cruise Control bracket 8030 8031 8032 or 8036 chrome IMPORTANT NOTE With engine off make sure that there is no interference when opening and closing the throttle Be sure there is no binding or hanging up between idle and wide open throttle as this could cause the throttle to stick open resulting in loss of engine speed control 5 Connect manual choke cable to the provided lever attachment point and cable mounting bracket manual choke models See Fig 9 Electric choke models connect red choke wire to 12 volt source that is activated by ignition switch Not coil or alternator see Fig 7 NOTE If manual choke is not connected secondary carb of dual carb set up for example then choke blade must be fixed open To lock open use a stiff piece of wire between the choke lever and the mounting bra
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