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It is smooth, Bill. But, I did have the prop
dynamically balanced with the engine running.
Ed
----- Original Message -----
Sent: Wednesday, March 05, 2008 9:40
PM
Subject: [FlyRotary] Re: Renesis crank
sensor users
How smooth is it, Ed?
Bill
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Wednesday, March 05, 2008 9:07
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Renesis crank
sensor users
Bill, I don't have a Renesis nor a
Cato prop. However, I do have a Performance 74x88 prop with a 2.85:1
gear box and a 91 turbo block (sans turbo)
13B.
I get 6000 rpm Static and up to
6200 static on a cold day. My MSL is 565
ft.
The Renesis should give you
about that with your larger prop and more HP assuming you
have the 2.85:1, if you hve the 2.17:1 gear box then the mid to upper 5000 rpm
is what I would expect once tuned up.
----- Original Message -----
Sent:
Wednesday, March 05, 2008 8:58 PM
Subject:
[FlyRotary] Re: Renesis crank sensor
users
I started the engine after I installed the circuit
and ran it for a few minutes just to see if I had screwed something up in
the install. My initial impression is that the hesitation is gone and
the engine runs much smoother. The A/F ratio seems to be more stable
as well. I am working on my cowling at the present time, but as soon
as I finish, I will try and get the engine tuned up and we will see how it
runs.
By the way, I don’t have a clue as to what to expect
when doing a max static rpm run. I saw on the list the other day where
someone with a similar set up, (Renesis, 76 X 88 prop Cato where mine is
Performance) was getting 6000 static at a density altitude of 6000 ft and
manifold pressure of ~22 inches. My field is at 55 feet. I
haven’t done any density altitude calculations, but it is going to be close
to sea level. I am getting about 5300 at about 30
inches.
Does anyone have an opinion about how these numbers
might compare? I haven’t tried to tune it yet, but it seems to
me that the rpms should be closer.
I also am getting a pretty good vibration when I run
it up. During the above test, for example, I could hardly read my
altimeter for the vibration of the needle. I am expecting smoothness
with the Renesis. Could this be due to the tuning? I spoke with
Clark Lydick. The prop could be the problem, but it is probably not
more likely than something else.
Opinions??
Bill B
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy Crook
Sent: Wednesday, March 05, 2008 7:42
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Renesis crank
sensor users
The high speed miss/backfire (which can be very
violent) is the symptom you might expect to go away in your case. The
hesitation is probably unrelated. For that you probably need to richen
the mixture at the point where the engine is running prior to the throttle
advance.
Note that if the engine is leaned out for best
economy (using the manual mix control) and you then come down without
setting the mixture to 'normal', the hesitation is likely. This
is the same as you might get on a Lycoming in the same situation.
Always set the mixture to moderately rich after descending or in the
pattern.
There are several other things that can cause
hesitation as well but I don't have enough info to say what your's might
be.
The unstable mixture might be related but again, not
enough info to go on.
On Fri, Feb 29, 2008 at 5:51 PM, Bill Bradburry <bbradburry@bellsouth.net>
wrote:
Tracy,
Could
you please elaborate a little about some of the symptoms that you have heard
or know about that this will cure? My Renesis starts fine, but I get
some rough running at speed. I have had backfire once. Also,
when I advance the throttle, the engine does a large hesitation before it
takes off in a quick rev. Like a car might if it didn't have an
accelerator pump.
My
air/fuel indication seems to be unstable also at speed. Is that
related?
I put
the circuit together this afternoon and will install it, but I am wondering
what symptoms I might expect to go
away…
Thanks,
Bill
B
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Thursday, February 28, 2008 1:15
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Renesis crank
sensor users
Forgot to explain how to connect it. The two
leads are to be connected directly across the two leads of the Renesis crank
sensor. It can be installed near the sensor, near the EC2 or anywhere
in between, whatever is easiest. It is not polarized so it
doesn't matter which terminator lead goes to which sensor
lead.
On Thu,
Feb 28, 2008 at 1:06 PM, Tracy Crook <tracy@rotaryaviation.com>
wrote:
After
completing a study of my 20B problems associated with the Renesis trigger
wheel and sensor, I am recommending that all users of these parts
along with an EC2 engine controller install the sensor termination circuit
shown on the attached drawing.
The
Renesis sensor has different enough characteristics from the
2nd gen sensor that it needs this circuit to properly match it. It
replaces the 1000 ohm resistor that some may have already
installed. This addresses both the starting problem and the high
rpm miss that have occurred in some
installations.
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