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FWIW, I track Subaru fail rates. The crank sensor fails 1 per 200k hours
estimated. Which sounds ok, but isn't the best rate. It is trivial fail
rate though, as the ECM has design features which determine sensor has failed,
flags owner, then uses cam sensor. This is a big part of the reason there are
never (virtually) vehicle shut downs. Pretty ingenious failure mode
actually....the engine is difficult to start if one of those sensors fails, yet
runs great. They use irregular pulse intervals for each of the sensors, making
it easy to self diagnose.
We've been discussing these design advantages for years on the newsgroup.
It's good to hear it results in design requests. I've heard of at least three
aircraft crank sensor failures. Two were custom wiring failure, crash
resulted. One was actual sensor. All of these had aftermarket ECM's ...so engine
stopped. I look forward to when the aftermarket ecm's take advantage of these
safety techniques.
On Thu, 29 Dec 2005 11:15:57 -0500 "Tracy Crook" < lors01@msn.com> writes:
Not a stupid question at all. Nothing special about the
sensor but note that it is a variable reluctance sensor, not Hall
effect. Most any VR type will work but some are more reliable than
others. The Subaru does not have a good track record based on the number
of Soob flyers who have had failures and asked me to make dual pickup versions
for the EJ-2x & EG-33 engines. I have not heard of a Mazda
sensor failing but that is of course no guarantee that it can't happen.
Do be sure to check the polarity of any VR sensor used. The output
should swing positive as the tooth moves toward it and negative as it moves
away.
Spent yesterday configuring my oil system on the RV-8. I should
have heeded Rusty's warning on those "Easy push-on oil line
fittings" The Summit description says "no more busted knuckles trying to
assemble oil lines". Ha! I'm an FAA "standard 170 lb pilot"
but that is not enough force to put on those blasted fittings. Anyone
know a trick to make them easier to put on?
Tracy (finally getting my XM weather activated)
----- Original Message -----
Sent: Thursday, December 29, 2005 9:39
AM
Subject: [FlyRotary] Re: Eccentric
Shaft Position Sensor
Kelly Troyer
wrote:
>
> > >
Ken,
> > > Hit the
junkyards........1999-2002 Mazda Protege
"Camshaft
>
Sensor"
> > > is the same part number as
the 1993-95 RX7 eccentric shaft
>
sensor....
> > > Rock Auto price had
best price of $81.00 that I
> found.......Get
the
> > > connector from the donor car
harness with the sensor !!
> > >
--
> > > Kelly
Troyer
> > > Dyke
Delta/13B/RD1C/EC2
> >
>
> >
>
> Guy on eBay is letting them go for $40.
>
Tracy, I don't
really expect you to know such trivia, but it can't hurt
to ask.
The eBay store with the RX-8 crankshaft sensor has a bunch of
other models, so for as little as $5. Is there anything special
about
this particular model, or is it just a hall effect sensor?
Some of the
other model numbers looked like they had long mounting arms
that would
make installation in an RX-7 series a tad easier.
--
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Dyke Delta
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-al wick
Artificial intelligence in
cockpit, Cozy IV powered by stock Subaru 2.5
N9032U 200+ hours on
engine/airframe from Portland, Oregon
Prop construct, Subaru install, Risk
assessment, Glass panel design
info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
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