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Mark, it does not take much resistance to protect the
injector from current draws by other devices. I install a 200 ohm resistor
between my EFISM and the driving injector. That way at a nominal 12 volts
- the most current the other device would draw (if shorted to ground)
is I = E/R = 12/200 = 60 ma (probably much less is the device is probably not a
direct ground) not enough to pull your injector open.
I put it in there (as close to the injector as I
could) so that if by chance my EFISM lead from the injector got shorted to
ground it would not pull the injector open.
The resistance is not critical, I have used from 100-500
ohms. You could increase the resistance until your other device stopped
working (and then reduce the resistance a bit from there).
The quickest was to see if that is the problem is simply
to disconnect that aux lead to injector.
Ed
Sent: Tuesday, May 29, 2012 11:02 AM
Subject: [FlyRotary] Re: injector imbalance
Steve,
I almost understand what you're telling me. Bill Shultz commented on
the Blue Mountain EFIS using the #1 injector for RPM. So, if the BMA EFIS
is connected to the #1 injector lead, then it could be causing the over rich
condition on that rotor. I'm not sure if I did that or not as my BMA RPM
indicator has never worked. It has been many years since I installed the
EFIS, so I don't recall if this was done or not. But this will be the next
thing I will check.
Thanks,
Mark
On Tue, May 29, 2012 at 9:47 AM, Steven W. Boese <SBoese@uwyo.edu> wrote:
Mark,
If a device is connected to the EC2 side of the primary injector of rotor 1
and this device has diode protection from the inductive spike produced by the
injector winding, then this injector will deliver more fuel than the injector
pulse width would indicate. The appearance on the O-scope would more
evident in the lack of an inductive spike for this injector rather than in a
difference in the signal pulse width.
Steve Boese
RV6A, 1986 13B NA, RD1A,
EC2 No virus found in this
message.
Checked by AVG - www.avg.com
Version: 2012.0.2178 / Virus
Database: 2425/5030 - Release Date: 05/29/12
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