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In order of priority, here are the wires to keep off to themselves:
1. Coil power wires.
2. Injector power wires
3. Injector driver lines
4. Injector current return lines (pins 19 & 37 on EC2)
All these can be together by themselves.
Having said that, I have never had any problem with having all the wires together. It is just that in cases where system noise levels are high due to electrical system layout, long battery leads, etc, these are the lines which builders have found that would push things over the limit and cause a problem. This is not a cure-all that is guaranteed to fix all noise problems.
Another step that has made the difference between lots of problems and working fine is a noise bypass capacitor from coil power to ground. This should be located near the coils. I don't have a part number because this part normally comes on the engine block (big ground tab under a bolt with a single lead coming from the part. The value is typically .47 uF at 250 volts. An acceptable substitute is one of those old timey point type distributor condensers.
Tracy Crook
On Tue, Jun 16, 2009 at 3:33 AM, Christopher Barber <CBarber@texasattorney.net> wrote:
OK, I think I got separate wire runs for the needed runs to the EC2. To recap, from what I recall the injector wires should be segregated in a bundle as well as the wires to the coils in a separate bundle. I believe the wires to the Crank Angle Sensor do NOT need to be bundled separately since they are shielded.
My question is, when segregating the bundle for the injectors Tracy states to segregate wires 17, 18, 35, 36 & 19 and 37 from the EC2. For this, does it just include these wires are should the POWER wires for the injectors also be segregated?
Also, the one wire that goes from the Rotor One Primary injector to the EM2/engine monitor, should it be segregated along with the other ones since int is connected to the injector?
Finally, as to wires 19 and 37. In Tracy version of the wire diagram it shows these two ground wires grounded on the airframe. He also states that these two wires should be as short as possible. However, in the alternate wire diagram provided in the manual (the one with the coil wire harness that is in color online), and the diagram that is easier for me to wrap my mind around, it shows these two wires ground to the engine. To ground to the engine makes it a pretty long wire run. I cannot ground to the airframe in a composite. IS IT ACCEPTABLE to ground these two wires to my ground "forest" (the one from B&C per AeroElectric/Bob Knuckles) on my firewall. This would allow for these two wires to be quite short....from about four feet to about 10 inches.
Thanks for your patience guys. Doing this stuff now is much easier on the third or forth attempt <g>.....I gotta do something while waiting for my new "Minstral type" injectors to arrive <g>
All the best,
Chris
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