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Brian,
I just made measurements on some Mazda OEM fuel injectors. A high impedence injector draws 0.9 amps continuously at 12 V. A low impedence injector without a series resistor draws 5 amps continuously at 12 V.
My 13B requires less than 20 amps continuous current in normal cruise configuration with the strobes on and one fuel pump in operation.
Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of bktrub@aol.com [bktrub@aol.com]
Sent: Thursday, May 31, 2012 9:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Injector balancing
I've recently found that a 40 amp alternator is not sufficient to run a 13B with electric fuel pumps and EFI. Seems the injectors take up a huge amount of amperage at higher rpms. I'm fine on the ground,- at about 13.7 volts, but when I'm running 5-6000
rpm, my voltage starts dropping and stabilizes at a little below 12 volts after an hour of flying. I have two 18 AH batteries. I"ve got a Dynon D10, terra 250 Transponder, Xcom radio, EC2, EM2, and two fuel pumps from RWS. I only run one pump at a time except
for takeoff and landing. Anyone know what the current draw for the injectors is at 6000 rpm?
Looks like I need to add another alternator.
Brian Trubee
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