X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost06.isp.att.net ([204.127.217.106] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6652780 for flyrotary@lancaironline.net; Wed, 25 Dec 2013 11:46:06 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.217.106; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-98-85-142-133.mco.bellsouth.net[98.85.142.133]) by isp.att.net (frfwmhc06) with SMTP id <20131225164530H06004u8s3e>; Wed, 25 Dec 2013 16:45:31 +0000 X-Originating-IP: [98.85.142.133] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Renesis with 76 X 88 prop Date: Wed, 25 Dec 2013 11:45:36 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01CF0166.D4174320" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Ac8Bg3AYD4vrWpSNSXCsSymohJ92XAAC8Fpw X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01CF0166.D4174320 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 Bill, 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 On Dec 23, 2013, at 9:16 PM, "Bill Bradburry" wrote: 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 Dennis, 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. From: Dennis Havarlah Sent: Tuesday, December 24, 2013 8:07 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Renesis with 76 X 88 prop I've had server issues this week and could not send this until today. Bill 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. Dennis H. ------=_NextPart_000_0003_01CF0166.D4174320 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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

 

Bill,

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


On Dec 23, 2013, at 9:16 PM, "Bill Bradburry" <bbradburry@bellsouth.net>= wrote:

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@lancaironlin= e.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

 

Dennis,<= /u1:p>

  &n= bsp;           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.

 <= o:p>

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.

 

Bill

 

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.

 

Dennis = H.

 

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