To All Rotorheads,
I just want to post a progress report and ask one question;
first,
the progress report. Everything is progressing,
it just doesn't happen fast enough. Modifying an automotive
engine for
aircraft use is extremely time consuming. I
have been at this since June '07, almost six month's and I'm
still not
finished (10-14 hour day's, just about seven
day's per week).
The engine does look good though; the cast-iron part's are
painted,
the aluminum part's are polished (satin finish),
and even the PSRU has been lightened and polished. I also
did some
really light intake porting. I have my motor-
mount's ready for welding, the coil's are mounted, and I'm
presently
working on the mounting bracket for an RX-8
sensor. The bracket was not difficult to design or fabricate and
for me
the weight saving's was worth it. Only two
pound's, but a little here and a little there and before you
know it you
have lost ten pound's.My ECU is back from
Tracy and has been up-dated as well as re-programed for the RX-8
sensor
and coil's. Next, the intake and exhaust
system's and it should be ready to run; hopefully by the end of
February
'08.
Now the question: does anyone know the exact radial off the
e-shaft
that the RX-8 sensor sit's. It can be in
degree's, minute's, second's or in hour's, minute's, second's. I
can
work with either one. Starting point, of course,
would be at the top ("0" degree's or 12 O'clock). Hopefully,
one
of you
can provide this information. Thank's!
Frank R. Clementi
I assume you are installing the RX8 sensor on the 13B Frank.
There is nothing in the RX8 manual about the position of this
sensor. Mazda assumes you are using an RX8 E-shaft, computer and
pulley
hub. As I recall Mark Steitle installed one on his 3 rotor.
It looks like it was bolted to a stock 3 rotor hub using the
stock
hole position, spacers and a stock RX8 trigger wheel.
As I recall Mark's original custom pick up bracket was steel and
apparently
the pick up did not like steel. Or perhaps it was the other way
around.
What say you Mark?
Here is an old message.
01/23/2004 08:33 PM
Bulent Aliev wrote:
> >
> > Hi Paul,
> > The main pulley diameter on the Cosmo is 128mm about
5". The
trigger wheel
> > should be about 135mm I guess?
> > I just mailed you the RX-8 one Priority USPS.
> > --
> >
> > Bulent
I got the RX8 trigger wheel Bulent. Thanks. The good news is
it fits
the 2nd gen E-shaft flange weird bolt pattern. I am not yet sure
about the
timing but Tracy could handle that in software.
Paul Lamar
Frank,
I took reference for the location of the CAS from a Renesis
engine. The
easy way would be to adapt a Renesis front cover. You could save an
extra pound or two with the Renesis water pump (assuming you
have a cast
iron water pump). If you get it close, you can adjust the
timing with
the EC-2.
In order to get the timing wheel, I had to buy an entire Renesis
front
hub. You might be able to find just the timing wheel used. The
Renesis
hub won't fit on the old engines and the bolt holes don't match
the RX-7
hub, so you'll have to re-drilled the timing wheel holes. That
should
be done in a lathe. As I recall, there is a diamond-shaped mark
on the
timing wheel that points to 12 o'clock when at TDC, but check &
verify this before drilling.
Keep in mind that the gap between the CAS sensor and the timing
wheel needs to be about .020". Wider than that and the signal
gets scrambled and the engine mis-fires at higher rpm. Also,
make sure
the sensor is centered on the timing wheel and don't make the
bracket
out of ferrous material as this will also cause the signal to
get corrupted.
My recommendation would be to either adapt the Renesis front
cover to
your engine or use the original CAS.
Mark S.
"bolt holes don't match the RX-7 hub"
Mark, do you know if this holds true for the 3rd gen engine?
I think Bulents Cosmo engine had the same hub as the 3rd gen
engine. Your 20B three rotor hub used the 2nd gen style CAS.
Paul Lamar
Paul,
You're correct that the 3rd gen engine uses the Renesis style sensors.
But I think it used two. Also, the water pump runs off the back side of
the serpentine belt. I don't know what else is different.
Mark S.
Not sure on the 3rd gen bolt holes. All I can say is that the Renesis
hub wouldn't work on my 20B, and the hole patterns were different
between the 20B hub and the Renesis hub.
Mark S.
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