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Hey Tracy;
Welcome back. My engine (20B) is finally headed for
the dyno after a little manifolding......(:-) Finally got my belly scoop,
hanging it now, fun and games.
Greg Ward
Lancair 20B N178RG in progress
----- Original Message -----
Sent: Wednesday, July 16, 2008 12:14
PM
Subject: [FlyRotary] Re: No Spark from
Coils
Bob gave you good advice John. Pin C should have about a 3 - 4 volt
pulse on it though (when cranking or running). 27 volts sounds like
measurement error. There is no source of voltage that high in the
system.
Do you have the diagnostic modes? Try it if so.
Tracy (back from Colorado)
On Sat, Jul 12, 2008 at 12:12 AM, Bob White < bob@bob-white.com> wrote:
Hi
John,
Pin A to engine ground is correct, pin B to EC2 ground is
correct, +12V
on pin D is correct. I'm not sure what you will read
on pin C with a
voltmeter. It should pulse from 0 to +12V, and you
will need an
oscilloscope to see it properly. What really concerns
me is the 27
Volts. The EC2 ground lead is connected to the EC2
ground stud, and
that should be connected to airframe ground near the
EC2, so that
voltage should basically be zero. I'm not sure why you
would see
anything anywhere above the 12 to 14 volt bus
voltage.
My first suggestion would be to double check ground
connections at the
EC2, and make sure there is a ground strap between the
engine and
battery that will handle the starter currents.
The
minimum load on pins 20 and 21 is several K ohms, and shouldn't
cause any
problems, but just to be sure, can you disconnect
it
temporarily?
Bob W.
On Fri, 11 Jul 2008 23:29:31 -0400 "John
Downing" < downing.j@sbcglobal.net>
wrote: > Bob W, today I joined the non-start rotor club, I
expected it not to start after following the Saga of Buly and Chris.
We don't have any ignition. We checked the wires to the coils
and , all coil plugs have ground to block on pin A, ground to EC2 on pin B,
voltage on Pin D. On cranking, Pin C on the volt ohm meter on
cranking shows 9 volts, dropping to 7 volts which is a steady reading on not
pulsing. Pin B which is the ground to the EC2, voltage rises to 27
volts. What is the voltage that we should be seeing on pins B and C
and should C show a pushing voltage? Is the Tach interface that you
sent me, which is connected to EC2 pins 20 and 21 for leading coils having
anything to do with the fact that the coils are not firing.
JohnD >
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and
holding
Cables for your rotary installation - http://roblinstores.com/cables/
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