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Buly, If I understood your findings. There are eight wires to the injectors (2 per injector). Four (one per injector ) will be connected to the 12Vdc power source through your injector switches/CB. All will have 12Volts on them if your injector switches are on and there is power to them (engine not running). The other Four of the 8 wires (one per injector) will go back to the EC2 (these are the wires that trigger the injectors). Remember that all the injector has electronic-wise is a coil of wire. So if you have 12V on one end of a coil of wire, you will have 12V on the other end - if it is NOT grounded. You must have current flowing through the coil to produce a voltage drop and if the one side is not grounded, there is no current flow and no voltage drop so the wire on both sides of the injector will measure 12Vdc.
The way the EC2 triggers the injectors is to ground this wire through a transistor inside the Ec2. So only the periodic grounding of the one side will activate the injector. Therefore, if the engine were running you would find that one side of the injector will always have 12Volts on it and the other side will be pulsating between 12 volts and zero volts (this the wire going to the Ec2). If the engine is not running (and there is power to the injectors) then there will be 12Vdc on both sides of the injector connection or on all 8 wires to the injectors.
Ed A
----- Original Message ----- From: <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, October 14, 2005 11:55 PM
Subject: [FlyRotary] Flooding on startup....
Tonight I spent some time checking around the engine. With both inj. switches on, I have 12V on all the wires going to the injectors? As far as I know, there is one 12V feed from the switch to each P/S injectors and one wire for each injector comming from the EC2 providing intermitten ground. If I'm right, how come there is the same voltage on all the wires?
Buly
BTW few months ago the engine was running perfect? I have no idea what caused all this trouble?
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