Bill: Could you post a picture of your firewall forward set up including your exhaust system with the muffler. Thanks Tom giddings
Sent from my iPad
Mark,
It shouldn’t be restrictive. I
am using the stock Renesis exhaust manifold which is cut off at the level of
just prior to the flywheel. The manifold is 3 inches in diameter at that
point. I welded a 3 inch stainless pipe there which does a 180 bend with
a radius of probably 4 inches. It then goes into a 3 inch in/out DNA
muffler, then 3 inch ss exhaust the rest of the way out. My EGTs have
always been this high, even when I didn’t have a muffler in the same
setup. I have considered that the probes or the EM-2 may be incorrect,
but I think that there is not much calibration required for a K type
thermocouple. I think the probes are just closer to the engine than most.
Bill
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Mark Steitle
Sent: Wednesday, December 25, 2013
10:10 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Renesis
with 76 X 88 prop
How restrictive is your exhaust? I ask because I experienced a
200 degree increase in the EGTs on my 3-rotor when I tried a tangential style
muffler. I hadn,t made the connection until Lynn Hanover posted a message
about how sensitive the rotary is to exhaust back pressure. That,s when I
figured out what caused the increased EGTs, increased back pressure. I
reinstalled the old exhaust and the EGTs mysteriously dropped back into the
normal range. Could this be the source of your high EGTs?
Mark S.
Sent from my iPad
Neil,
Are both the intake and exhaust P
ported? How did you do it? How did you block off the side
irons? I doubt there is anything wrong with our timing or advance.
I have a stock Renesis and I get EGTs from 1725 to the middle 1800s.
How close to the engine are your probes?
Bill
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Neil Unger
Sent: Monday, December 23, 2013
6:40 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Renesis
with 76 X 88 prop
I have a P ported renesis and am seeing EGT up to 1850. Having talked
with various people with far more knowledge than myself, who suggest it may be
that the spark should be advanced up to around 30 BTDC. to reduce the EGT.
Rather than destroy the motor finding out, I am looking at getting the engine
onto a dyno to clarify the timing and EGT’s. Should be very
interesting to say the least. No one works here until the first half of
Jan has passed in this banana republic of OZ.
Sent: Tuesday, December 24,
2013 8:07 AM
Subject:
[FlyRotary] Re: Renesis with 76 X 88 prop
I've had server issues this week and
could not send this until today.
I actually have the RD1-C PSRU. (My Bad.)
Tracy started selling
these about 6-7 years ago for use with the Renesis.
The prop turns clockwise from the pilot's
seat view.
I normally see EGT's in the high 1750 F.
during full power takeoff and early climb. It will go above 1800 F. if the
mixture is real close to best power. I have my EM-2 set to warn me if the EGTs
go above 1800.
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