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Hi Bill,
When you just need a quick check of differential on EGTs, glance at the EGT bar graphs on the main page of EM2. If the bars are close to the same height you know they're OK. Each of the segments on the bars represents about 20 degrees F. One or 2 segments is not a problem, if there is a rotor differential problem bad enough to cause a miss due to mixture or ignition, it will be well over 100 degrees in difference, i.e. it will be obvious. Remember which bar was the low one and that will tell you which rotor to start looking at.
One other thought: Since you are running the Renesis, did you have the EC2 upgraded with the Renesis CAS terminator? Don't know if you were following the thread when that was being discussed a couple of years ago. The EC2 was originally designed for the 2nd gen CAS and the Renesis was different enough to need a change. High speed miss or hard starting were the symptoms.
Tracy
On Sun, Mar 6, 2011 at 8:14 AM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
Mark,
The car the engine came from had about
1400 miles on it. I have run about 40 gallons of gas thru it. I will
have to check the coils for darkening. Also same for plug wires. I am
using the stock Renesis plugs. I might try cleaning them.
On a previous occasion, I flooded the
engine and it would not start till I sand blasted the plugs. After that
it started normally.
This problem just happened on the second
takeoff. The engine was running smoothly at all rpms till I made the
second takeoff. It started to miss and pop and the rpm would only go to
about 6300. after I got in the air, I dialed the prop back and the rpm
was around 6000 and the engine smoothed out again and was ok the rest of the
flight. Now it is missing on the ground above the staging point. I have
mine set at 16 inches.
I watched the mixture and it seems fine on
both sides of the staging point and also on up in the higher rpms. The only
difference is that the engine starts to miss.erratically. I didn’t notice
the EGT as Tracy
suggested. I need to switch to the page that shows the temp of both of
them and check that today.
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mark Steitle
Sent: Saturday, March 05, 2011
9:50 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Miss
above staging point.
Bill,
How do the coils look (underneath)? Are there dark areas in the
potting material where they have gotten hot? There is a history of coil
failures in the RX-8's after about 30k miles.
How many hours on the plugs/wires? How do they look?
Mark
On Sat, Mar 5, 2011 at 8:36 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
Mark,
I have the stock Renesis coils.
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
On Behalf Of Mark Steitle
Sent: Saturday, March 05, 2011
6:19 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Miss
above staging point.
Bill,
Which coils are
you running? I chased an intermittent miss which occurred in the 6000
-7000 range. I upgraded to the LS2 "Yukon" coils and the miss was gone.
Mark S.
On Sat, Mar 5,
2011 at 4:56 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
I have developed a miss above the staging point. The fuel
pressure seems ok, the mixture also seems ok. I am at a loss.
To try and troubleshoot, I am considering getting above the staging
point and disabling the primaries and secondaries to see if I can identify
which is the cause. Since it runs ok below the stage, I assume it is not
the primaries.
I recently changed my fuel filters and installed a large canister filter.
There seems a possibility that I introduced some contamination that
clogged an injector. Other wise it seems it must be spark related.
This just happened one flight ago. The engine was running fine, till that
last takeoff. It was missing and would only get about 6300 rpm.
After take off, I turned the prop back and slowed the engine down to below that
number and it smoothed out and ran fine the res of the flight. Today
while taxiing around, I noticed that the miss was back.
Opinions welcomed.
Bill B
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