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, I could not get the light on the probe to blink. But I am not all
certian the CAS is bad. For one thing there is some mention on the web that
leads one to think that the interruptor disc can be missinstalled, don't
really know. Some info on a couple websights say that clearance on mazda
engines should be 9-14 thousands, ours measures 1/8 to 3/16 between the
interrupter wheel and the CAS. Mazda wants $150 for a new CAS so we will
take your suggestion and shop for a used one. milo
Call 1 800 692 4497 and ask for the parts department. Tell the parts department
guy you are on the rotary engine newsletter and get him to give you
a price. You should do better than $150. This is Bob Mears Mazda in Lubbock TX.
Bob is on the list and is building a rotary powered Spitfire.
Paul Lamar ...No rotor no motor.
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