Mark,
I’ve attached a plot of data collected using high impedance
injectors with and without the series resistors recommended for use with the
EC2 and low impedance injectors. The results show little effect due to
including the series resistor in this case. Most of the difference is in
the low flow rate region where the effects of the injector on/off time delays are
relatively more significant. I didn’t test using a low impedance
injector without the series resistor since that would probably not be good for
either the EC2 driver or the injector due to the larger currents that would
result.
Steve Boese
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Tuesday, November 02, 2010 9:03 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: EM2 Numbers
Ed,
I measure the manifold pressure at the unused oil injection
ports in the rotor housings. The EM-2 MAP reads in the upper 20's while
at WOT, so I don't think I have a problem with this. The MCT was as
received, which was set up for Tracy's injectors. I assume they were
460cc, but that's just a guess. I'm running 60# DEKA IV injectors.
Could there possibly be an impedance mismatch between the two types?