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| FUEL INJECTION BASICS
Typical Enderle Fuel system Enderle fuel system operation - Fuel pump driven from cam pumps through the shut off valve to the barrel valve. The main bypass pill/jet is located in the barrel valve. The pill limits the amount of fuel being RETURNED to the tank. The remaining fuel is sent directly to the nozzles. The nozzle pressure is regulated by the spring in the barrel valve popit. Because the fuel pump speed is dictated by cam speed, there becomes a point in which the engine cannot utilize all the fuel being sent to the engine at high rpm. The High-speed bypass is utilized to bypass additional fuel at high rpm. Idle Control The idle mixture is controlled by the turnbuckle on the side of the injector. To richen the idle, rotate the turnbuckle towards the rear of the injector, (shortening the linkage leans the mixture, lengthening richens the mixture). This adjustment is for idle and throttle response only and has no effect on full throttle. The idle speed is controlled by the butterfly shaft stops on each side of the injector. Main Bypass Jet Each fuel injector is furnished with a set of bypass pills. This bypass controls the fuel mixture at full throttle and has little or no effect on the idle. The bypass pill is located under the 9/16 hex plug on the metering valve. Use a smaller bypass to richen the fuel mixture and a larger bypass to lean it. When installing the bypass, make sure that it is seated at the bottom of the threads. High Speed Bypass System Certain applications require the use of a hi-speed lean out. This consists of a bypass pill controlled by a high pressure check valve which leans the fuel mixture at high RPM. The check valve pressure is adjusted with shims to tailor the fuel curve to the engine's requirements. The check valve opens when the fuel pressure is able to overcome the spring tension. The bypass pill controls the volume of fuel returned. Adding shims will make the check valve open at a higher RPM. Removing shims will make the check valve open at a lower RPM. The hi-speed should be thought of as a fine-tuning device. The main bypass pill is the primary control of the overall fuel mixture. Maintenance The fuel system should be drained between races. It is important to lubricate the entire fuel system, particularly the fuel pump and blower rotors, with WD-40, light oil or some other type of lubricant. Remove the inlet line from the metering valve and lubricate the metering piston to prevent stickiness and drying out. WARNING You must use a 3-way fuel shutoff with a return to the fuel tank. A 2-way style shutoff will damage the fuel pump. Baseline - Set butterflies at .010-.012 open. Set leak on barrel valve at 65-70%. Nozzles should be sized large enough that the main bypass is between .120 and .150. main spring about 5 psi when checked with air pressure. High-speed bypass spring about 28-30 psi and a pill half size of main pill. General Installation When installing the injector on the blower, tighten the bolts evenly to prevent distortion. A gasket or silicone seal must be used between the injector and the supercharger. Nitro Type Metering Valve The idle check valve should be installed where the housing is marked "RET". The upper check valve is the high pressure pump relief and should also have a return line. The fuel line from the pump should be connected to the fitting marked "IN". The line to the port nozzles should be connected to the fitting marked "PORT". Methanol Type Metering Valve The idle check valve should be installed where the block is marked "OUT". Connect the return line to this check valve. The fuel line from the pump should be connected to the fitting marked "IN". The fitting in the rear corner of the metering valve should be connected to the top nozzle distribution block. Systems utilizing port nozzles will have an outlet fitting installed in the bottom of the metering valve. Idle Control The idle mixture is controlled by the turnbuckle on the side of the injector. To richen the idle, rotate the turnbuckle towards the rear of the injector, (shortening the linkage leans the mixture, lengthening richens the mixture). This adjustment is for idle and throttle response only and has no effect on full throttle. The idle speed is controlled by the butterfly shaft stops on each side of the injector. Main Bypass Jet Each fuel injector is furnished with a set of bypass pills. This bypass controls the fuel mixture at full throttle and has little or no effect on the idle. The bypass pill is located under the 9/16 hex plug on the metering valve. Use a smaller bypass to richen the fuel mixture and a larger bypass to lean it. When installing the bypass, make sure that it is seated at the bottom of the threads. High Speed Bypass System Certain applications require the use of a hi-speed lean out. This consists of a bypass pill controlled by a high pressure check valve which leans the fuel mixture at high RPM. The check valve pressure is adjusted with shims to tailor the fuel curve to the engine’s requirements. The check valve opens when the fuel pressure is able to overcome the spring tension. The bypass pill controls the volume of fuel returned. Adding shims will make the check valve open at a higher RPM. Removing shims will make the check valve open at a lower RPM. The hi-speed should be thought of as a fine tuning device. The main bypass pill is the primary control of the overall fuel mixture. Maintenance The fuel system should be drained between races. It is important to lubricate the fuel pump with LPS-3, WD-40, light oil or some other type of lubricant. Remove the inlet line from the metering valve and lubricate the metering piston to prevent stickiness and drying out. Leaking down a barrel valve: Block off all injector lines & returns except for hat nozzles Connect dual gauge tester to outlet of compressor Set Air Compressor to read 100psi on 1st gauge Connect tester to inlet of barrel valve Read % on 2nd gauge |
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http://www.wildboats.com/techinfo.html Enderle supercharger fuel injection schematic for Methanol metering valve (rectangular metering valve) on alcohol or gas. For Alcohol blue is fuel to engine, green is optional fuel to engine, red is returned fuel, yellow is optional returned fuel. -- Alcohol fuel systemz components Metering valve ( barrel valve ), Main jet ( pill ) is installed in the metering valve , High speed by pass is optional (most systems have one), Port nozzles are optional (most systems don't have them), Idle check valve, 3 way shutoff, Fuel Pump most small cubic inch engines use a 80A-1 fuel pump, most big cubic inch engines use a 110 fuel pump, some big cubic inch - high boost - high house power engines use a 990 fuel pump. Minimum main fuel line size for alcohol is -16 or 1". Fuel return lines must discharge at opposite end of fuel tank from main fuel line pick up. Fuel tank must be vented. For Gas blue is fuel to engine, green is optional fuel to engine red is returned fuel, yellow is main returned fuel (for gas). -- Gas fuel system components Metering valve ( barrel valve ) a blank jet is installed in the metering valve, Main jet ( pill ) is installed in the High speed by pass, Port nozzles are optional (seldom used on gas), Idle check valve, 3 way shutoff, Fuel Pump most small cubic inch engines use a 80A-0 fuel pump, most big cubic inch engines use a 80A-1 fuel pump, some big cubic inch - high boost - high horse power engines use a 600 fuel pump. Minimum main fuel line size for gas is -12 or 3/4". Fuel return lines must discharge at opposite end of fuel tank from main fuel line pick up. Fuel tank must be vented. Explanation of Components ( Supercharger Fuel Injection Hat delivers air to the system) - ( Metering Valve controls fuel flow to all components ) - ( Main Jet richens or leans total fuel system) - ( Nozzles hat and port spray fuel into air intake system they are jets and come in all sizes ) - ( High Speed By Pass the body holds a jet ( pill ) and has a settable opening psi. check valve) - ( Idle Check Valve has a s ettable opening psi.) - ( Port Check Valve has a settable opening psi.) - ( 3 Way Shutoff allows pumped fuel to return to tank when shutoff ) - ( Fuel Pump delivers fuel to the system) Explanation of System Metering Valve - ( for Gas ) this metering system uses two return lines each with a check valve. The check valve on the bottom of the metering valve is for the idle circuit. The check valve in the tee fitting is the main jet return. The main bypass jet is installed in the tee fitting ( High Speed By Pass ) A blank bypass jet is installed in the metering valve and should not be removed. Idle Control - the idle mixture is controlled by the turnbuckle on the side of the injector. To richen the idle rotate the turnbuckle towards the rear of the injector ( shortening the linkage leans the mixture lengthening richens the mixture). This adjustment is for idle and throttle response only and has no effect on full throttle. The idle speed is controlled by the butterfly shaft stops on each side of the injector. Main Bypass Jet - each fuel injector is furnished with a set of bypass pills. This bypass jet controls the fuel mixture at full throttle and has little to no effect on idle. The bypass pill is located under the 9/16 hex plug on the metering valve. Use a smaller bypass jet to richen the fuel mixture and a larger bypass jet to lean the fuel mixture. When installing the bypass jet make sure that it is seated at the bottom of the threads. High Speed By Pass - some applications require the use of a hi-speed lean out. This consists of a bypass jet controlled by a high pressure check valve which leans the fuel mixture at high rpm. The check valve pressure is adjusted with shims to tailor the fuel curve to the engines requirements. The check valve opens when the fuel pressure is able to overcome the spring tension. The bypass jet controls the volume of fuel returned. Adding shim will make the check valve open at a higher rpm. Removing shim make the check valve open at a lower rpm. The hi-speed should be thought of as a fine tuning device. ( The main bypass jet is the primary control of the overall fuel mixture.) Fuel Pump - they are driven by the engine most are cam driven some by belt. As engine rpm. is incrusted more fuel is pumped then the engine can burn. By returning the excess fuel we can tailor the fuel curve to the engines requirements. ( At is how mechanical fuel injection works ) Pumps come in different sizes and are tailored to the requirements of your engine. 3 Way Shutoff - You must use a 3-way shutoff with a return to the fuel tank. A 2-way shutoff will damage the fuel pump. On mechanical fuel injected engines shut the engine off with the fuel shutoff not the ignition. ( On burnt fuel can cause the engine to hydraulic.) Maintenance - The fuel system should be drained between races. It is important to lubricate the fuel pump with LPS-3, WD-40 or some type of light oil. Remove the inlet line from the metering valve and lubricate the metering barrel to prevent stickiness and drying out. |