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Steve,
Can you describe your wiring setup? Schematic and describe how the wires are
routed? Are you using one of the Aeroelectric architectures?
I also suggest you put this question to Bob Nuckolls list.
(aeroelectric-list@matronics.com)
Bill B
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Steve Brooks
Sent: Saturday, November 21, 2009 10:50 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Need a sanity check
I have been working on an issue for three weeks now, with very intermittent
spark when cranking the engine. Needless to say, it won't start either.
I have a spark plug out of each rotor, and have them clamped to a good
ground, so that I can see a spark on the front and rear rotor.
If i rotate the CAS by hand, or turn the prop by hand, I get good spark.
When cranking with the starter, I get an initial spark, and then an
occasional spark on the front or rear rotor. Interesting, when I let off
the starter, I get a couple of good sparks as it coasts to a stop.
Both controllers do the same thing BTW.
I had emailed Tracy, as at one time I thought that the EC-2 had an issue.
Tracy said that he had seen this symptom a couple of times before, and it is
caused by noise from the starter interfering with the CAS signal. He
suggested that I install a 1K resistor across each of the crank angle
sensors. I installed the resistors, but it did not cure the problem.
This morning, determined to get to the bottom of this, I removed the battery
cable running to the starter, and using a spare battery, and a jumper cable
for the ground, I cranked the starter with this battery, which was isolated
from the airplanes electrical system. It had good spark on both rotors ....
yeah !!!
So then, I decided to reroute the starter cable on the other side of the
engine, which keeps it away from the other wiring. I hooked it back up to
the aircraft battery, crossed my fingers and cranked the started.
Same problem. I thought that perhaps the noise was getting into the
EC-2, so I put the spare battery in the back seat (pusher aircraft), and
using some jumper clips, I hooked the EC-2 through a fuse to the isolated
battery. Same problem.
I had extended the CAS wiring when I replaced the engine, so I decided to
reroute the shielded CAS wiring, so that I could eliminate the unshielded
wires, which were about 12" long. Same problem.
I am struggling with what to try next. This problem started before I
swapped the engine, as it was very hard to get started, though for three
years prior to that, I had no issues, and it started easily.
Has anyone else seen this type of problem, or have any suggestions ?
Steve Brooks
Cozy MKIV 13BT
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