As for the ignition, it is doing fine, now that I figured
out
what was
causing my misfiring condition at high rpm (6500 & up).
snips.......................
Other than that, it flies great!
Mark S.
snips....
Mark,
Sorry, I must have missed the info on your ignition
problem. What
was the cause and solution to your high speed missing
condition.
thanks, Joel
Joel,
A little history on my ignition problem. Originally, it was
using the
old style CAS, the one that resembles a distributor. I had the
idea of
changing over to the new Renesis style (fewer moving parts, 2 lbs
lighter). So, I purchased the necessary parts and did the
conversion.
I had to send the EC-2 back for upgrades anyway, so it seemed like
a
good time to have Tracy change it over. The mods included the
snubber
upgrade to solve the injector dribble problem.
Well, when I got it back, it ran beautifully in the lower rpm
range, but
wouldn't run in the upper ranges. We ended up installing a zener
diode
circuit and played around with resistor values until we got it
running
much better. This is what another Renesis builder did and it
fixed his
problem. Anyway, I thought we had it handled, until I started
doing
fast taxis and I got into the 7000+ rpm range. The misfire was
back.
Many phone calls to Tracy, and after trying many, many things,
none of
which helped, I was ready to change it back to the old CAS.
The last thing on my list of things to try was the CAS
bracket. Why the
bracket? Well, I remembered reading in the Renesis manual on CAS
information and they mentioned to beware of metal filings/powder
on the
CAS. I got to thinking that if it was that sensitive, maybe my
4130
bracket might be causing the problem. So, I fabbed up a bracket
out of
aluminum and tried it. Would you believe it, that was the
problem. It
runs great now and I couldn't be happier. So, if you decide to
convert
to the Reneisis CAS, make the bracket out of aluminum, not steel.
So, now you know "the rest of the story".
snips... info later
Thanks,
Mark
Thanks Mark on the CAS steel bracket bit. Amazing. Who would have
thunk?
:)
Paul Lamar ...No rotor no motor.
Mark I am suffering a similar problem. No ignition on an RX8 with
the the
standard CAS and RWS system. Would you please explain in laymens
terms about
the Zenior diode and resistor, actual values and a diagram would
help. What
is the internal resistance of your CAS? What is the output voltage
of your
CAS at cranking speed? As you know my CAS bracket is aluminum of
course, it
came with the engine. No filings on the CAS sensor, cranking voltage
not
less than 12V, battery ground lead does not pass even close to the
CAS, etc.
Who was the other Renises builder and his e-mail address please?
Thanks, Milo
Where do you live Milo? Perhaps we can find somebody with a scope to
help you
out.
Paul Lamar
Milo,
According to Tracy, the zener circuit is now built into the EC-2, so I
doubt that is the problem. Besides, it only addressed the issue of
overdriving the trigger circuit at higher rpm. Have you checked your
wiring to make sure that everything is wired correctly? Have you
verified that the CAS is not wired backwards (I made that mistake
initially). Have you checked the CAS signal with a oscilloscope (you
may have a bad CAS)? Have you verified that the CAS connector is making
connection with the CAS pins? What is your gap between the trigger
wheel and the CAS? The gap on my CAS is .020". Too big a gap will
prevent it from starting (don't ask). Do you have 12v to the coils?
Have you tested the injectors and coils in the simulation mode? Are all
of the ground leads connected to the EC-2 and to ground (Yes, I made
that mistake once too)? Is the d-sub connector making good
connection... any bent pins? Do you have fuel pressure to the
injectors? Finally, have you spoken with Tracy (he's back from
Colorado)? I would make a list, verify everything on the list, then if
it still doesn't start, call Tracy.
There has to be a reason why it won't start. You just need to find the
needle in the haystack.
Mark S.
Mark,
It would appear to be wired correctly.
Tracy said even if the CAS was wired backwords
it would still fire. It appears to be wired correctly.
Have not checked the CAS with a scope. The CAS
has 105 ohm resistance, what is the resistance of you CAS?
Have not verified the CAS pins.
Trigger gap is .032.
A full 12v is available at the coils.
The injectors and ignition check bright in simulation mode.
As best as I can tell all grounds are at the same level.
Have not checked the d-sub connector.
Fuel pressure is to the injectors.
Will continue with your suggestions, thanks a million.
Milo
Hi Milo
I'm building a Renesis 4 port.
I have two CAS's and they both read 1100 ohms.
Steve Izett
PERTH Western Australia Renesis 4 port Glassair SII RG
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