I took Tracy's EFI out of Mike Wills RV4 and can't get it to work on
the bench. It is getting a good CASsignal as I have a drill motor
driven 2nd gen CAS. It was working in the airplane.

I would be nice if Tracy had put a couple of LED's here and there to
reassure something was working.

If I ever design and build and EFI I will surely do that because it
is real cheap.

I am open to suggestions. I checked the wires and they seem OK

Will it work with out the PCM connected?

The relay works that selects one of the two computers.


I want to measure the dwell period  Tracy choose.

Paul Lamar



Paul,

What kind of voltage are you getting out of the CAS?

Joe Berki

At low RPM it is about 5 volts. The higher the RPM the higher voltage.
Typical of variable reluctance sensors. Tracy uses this zero crossing circuit
based on an  LM339 quad comparator. Cost of the chip 30 cents :) It does
not care about the amplitude. It will tolerate voltages up to 36 volts.

Here is a better schematic.

I am starting over on the wiring. Mike used non color coded wire and
it is a bear to trouble shoot.

Paul Lamar

The Rotary Engine News Letter. Powered by Linux.
 ACRE NL web site. http://www.rotaryeng.net
 You Tube http://tinyurl.com/beqqxas
 Copyright 1998-2014 All world wide rights reserved.