Can the RX8 CAS interuptor wheel be installed incorrectly such that
   the CAS
   will not function? milo

    >>> RX-8 engine 6 port.
    >>> Tracy computer and reduction drive 2.85 reduction ratio.
    >>> Bob White wire harness.
    >>> Cannot get the crank angle sensor(CAS) to fire the plugs.
    >>> Everything checks out up to the CAS. Have no way of testing the
   CAS.
    >>> Is it possible the starter is not cranking fast enough to
   energize the
    >>> CAS? Does any one know if there is a minimum cranking RPM? Has
   anyone
    >>> had this experience before? The prop is turning @ 1 per second
   or @  180
    >>> rpm when the starter is engaged. What is the resistance of the
   CAS, I
    >>> assume that it is simply a coil of wire inside the CAS can, is
   that
    >>> correct or not?
    >>> Thanks in advance, Milo
    >>>
    >>> You can buy a pulse probe that might check the CAS for fairly
   cheap.
    >>> Other than that you will need a scope. I could do a little
   schematic
    >>> later on a for a pulse checker.
    >>>
    >>> You need two cmos chips and a led.
    >>>
    >>> Works off 12 volt 4050 ot 4059 and a 4020 divide by 16,000 counter.
    >>> http://www.kpsec.freeuk.com/components/cmos.htm
    >>>
    >>> I'll do a schematic latter.
    >>>
    >>> Doc has some recent expeirence on this stuff. What is the
   latest Doc?
    >>> -- Paul Lamar ...No rotor no motor.
    >>>
    >>> Milo, You shoud be able to get the plugs to fire while turning
   the  prop
    >>> by hand.
    >>> VERY low speed will do it, depending on the system. Check to see
    >>> everything is grounded properly
    >>> Bill Jepson
    >>>
    >>
    >> Tracy's latest update has ignition / spark plug test mode. It fires
    >> the plugs as the engine was running at 3000 rpm.
    >> It works very well. CAUTION: Do not test with anyone around the
   prop.
    >> Any fuel fumes in the chamber will fire the engine enough to hurt
    >> somebody.
    >> Buly
    >>
    >> It would be real easy for Tracy to add a crank angle sensor check.
    >> If the intake manifold pressure suddenly went to below 7.5 psi or 15
    >> inches
    >> of Hg indicating the engine was turning over and the computer
   did not see
    >> a signal from the crank angle sensor it could put out an error
   message.
    >>
    >> Paul Lamar
    >>
    >
    >
    > Paul, I purchased the DP-21 that you suggested. Please give me a
   short
    > lesson on how to use it to test the CAS,
    > Milo
    >
    >
    > Hook the black alligator clip to a ground spot on
    > the engine. Hook the red alligator clip to +12 volts on the engine.
    > Disconnect the CAS at the connector. Ground one of the pins.
   Have some
    > one turn the engine over with the starter with the fuel pump off.
   Press
    > the
    > point of the probe to the other pin. If the LED blinks as the
   engine is
    > turning over the CAS works.
    >
    > The 1994 is probably the same as the RX8 engine sensor except the
   1994
    > had two instead of just one.
    >
    > You can download the shop manuals from:
    > http://www.wankel.net/~krwright/cars/rx7/manuals.html
    >
    > Paul Lamar ...No rotor no motor.


   Can the RX8 CAS interuptor wheel be installed incorrectly such that
   the CAS
   will not function? milo

   Not really. Are you not getting a pulse on the logic probe?
   It is still not working I take it. Try getting a third gen sensor
   out of
   a junk yard. See if Mazdatrix has a used one they will sell. A third gen
   sensor should work with the RX8 wheel. It is a possible the hole
   pattern is
   off and the sensor is not triggering at the shaft angle it should.


   --
   Paul Lamar ...No rotor no motor.

Paul,
It is also possible that the battery voltage is too low.  Anything below
about 9.5v will not fire the plugs.

Mark S.


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