Paul,

I made a major breakthrough today.  In preparation for hooking up the
Hytek data logger, I decided that it would be good to install check
valves on each vacuum line leading from each rotor housing.  (For those
who are unaware, I am running a peripheral port 3-rotor with a PL slide
throttle.)  My system measures MAP from the unused oil injection
ports in each rotor housing.)  Not sure what possessed me to do a
ground run right then, but I ran the engine right after installing
the check valves.  Now keep in mind that typical MAP readings at
idle up to this point was approx. 17" Hg.  Well, today MAP readings
were in the 14.4" -
15.0" Hg range.

Then it dawned on me that the way the vacuum lines were
plumbed the RWS EC-2 would see an average of all three rotors.
 Since each rotor is 120* (crank degrees) apart in their 4-stroke
cycle, the MAP would be quite a bit different for each rotor.  By
installing check valves in the vacuum lines, I have isolated each
rotor from the other two and I am measuring the lowest vacuum.  Idle
is now down around 1500 rpm, but the mixture is way lean, so it
appears that a re-tune is in order.  I'll probably re-set the RWS EC-
2 to the factory defaults and start the process over from the very beginning.

We need to stress to anyone that is measuring MAP in the rotor housings
to install check valves in each of the lines.

Mark

Good work Mark. Here is the latest voltage to pressure chart.

Paul Lamar


Mark,
To me check valves tells me you allow "flow" one way and block the other. If
that is the case you either inhibit sense or trap it. Also, is there a crack
pressure for these check valves? Crack pressure is the pressure to get it to open.

Dale Davies