>> 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.

Rich Martin found that he needed to turn the engine at
at least 300 rpm to get the plugs to fire. He was
using Tracy's ECU and EMU on a helicopter project.

Brian Trubee



The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.