X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma05.mx.aol.com ([64.12.100.31] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4986890 for flyrotary@lancaironline.net; Tue, 17 May 2011 20:43:08 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.100.31; envelope-from=Bktrub@aol.com Received: from imo-da01.mx.aol.com (imo-da01.mx.aol.com [205.188.169.199]) by imr-ma05.mx.aol.com (8.14.1/8.14.1) with ESMTP id p4I0gKYe014029 for ; Tue, 17 May 2011 20:42:20 -0400 Received: from Bktrub@aol.com by imo-da01.mx.aol.com (mail_out_v42.9.) id q.f5c.12014d3c (55725) for ; Tue, 17 May 2011 20:42:17 -0400 (EDT) Received: from smtprly-me03.mx.aol.com (smtprly-me03.mx.aol.com [64.12.95.104]) by cia-md02.mx.aol.com (v129.10) with ESMTP id MAILCIAMD028-b2d34dd315e319d; Tue, 17 May 2011 20:42:17 -0400 Received: from webmail-d037 (webmail-d037.sim.aol.com [205.188.181.88]) by smtprly-me03.mx.aol.com (v129.10) with ESMTP id MAILSMTPRLYME032-b2d34dd315e319d; Tue, 17 May 2011 20:42:11 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Engine Tuning Date: Tue, 17 May 2011 20:42:11 -0400 X-AOL-IP: 50.46.100.112 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: bktrub@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CDE30B8F20F4ED_1A2C_A3D4_webmail-d037.sysops.aol.com" X-Mailer: AOL Webmail 33668-STANDARD Received: from 50.46.100.112 by webmail-d037.sysops.aol.com (205.188.181.88) with HTTP (WebMailUI); Tue, 17 May 2011 20:42:11 -0400 Message-Id: <8CDE30B8EFD403E-1A2C-6648@webmail-d037.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: Bktrub@aol.com ----------MB_8CDE30B8F20F4ED_1A2C_A3D4_webmail-d037.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" Thinking on it a bit, I realized that what would probably happen at WOT wh= en flying as opposed to a ground run, is that my mp is going to decrease= from 29.1 to a somewhat lower value, since the RPMs will increase up to= ~6800 or so, up from the 5200 at static WOT. So, I would be running at a= lower MAP address than the 106 that I see at WOT static. So, should I not= richen the MAP values BELOW 106, and a few adresses above it since I shou= ld see a little gain in mp due to the ram effect of my air scoop? Brian Trubee -----Original Message----- From: bktrub@aol.com To: Rotary motors in aircraft Sent: Tue, May 17, 2011 4:49 pm Subject: [FlyRotary] Re: Engine Tuning Ed, Attached is my map table as of today after I tuned it tied down on the gr= ound. I have a 93 13BREW that is normally aspirated, it has 9.1/1 compress= ion, swinging a catto 74 dia x 88 pitch prop through a 2.85/1 PSRU. This= EC2 is set up to accomodate turbo engines, so I have addresses that go up= to 38 inHg. They are not used. =20 I generally idle at MAP address 11 mp of 14.9 inHg. at around 1600rpm. Th= is is a 60 degree day at barometer setting of 30.3. Advancing the throttle= , the EC2 switches over to the high RPM table at MAP address 17 (mp 17.2),= going straight to address 80. My staging point is 84 (mp 19.1) from there= up to full throttle, MAP address 106 mp 29.1, the transition is smooth.= At full throttle on the ground I'm getting 5200 RPM. When I go much past= that RPM on takeoff, that's when the missing starts. I'm still guessing= that I need to richen up the mixture in the addresses above 106.=20 =20 Any input from anyone on this would be appreciated. =20 Brian Trubee =20 =20 -----Original Message----- From: Ed Anderson To: Rotary motors in aircraft Sent: Fri, May 13, 2011 3:18 pm Subject: [FlyRotary] Re: Engine Tuning Brian, what values do you have in your fuel map around 90-105? I have= values of 172 for WOT and at times (cool OAT) I have to enrichen the mixt= ure beyond that with the manual mixture control =20 Ed From: bktrub@aol.com=20 Sent: Friday, May 13, 2011 5:35 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Engine Tuning Since the weather has been cooperating lately, I've had the opportunity to= put a few more hours on the airplane. On the ground, I can go from an idl= e up to full throttle and the engine will be smooth. But when I take off,= it seems that as soon as I'm up a few hundred feet off the runway, I get= hellacious backfiring at full throttle. I can mitigate it a bit by thrott= ling back to about 5100 rpm, and turning the mixture knob to near full ric= h. It's getting to be a bit nerve wracking to take off thinking I've got= it smoothed out and then get a series of hand grenades going off under my= butt. I'm thinking that I'm still running too lean up at map address 106= or so. So, I go into the edit page and richen up the mixture around those= addresses. I think I'm creeping up on smooth full throttle running. =20 The good news is that my coolant runs at 175 degrees and oil at less- so= the cooling is more than effective, I just need to close up my air inlet= a bit or restrict the outflow. =20 Brian Trubee =3D=20 -- omepage: http://www.flyrotary.com/ rchive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.= html ----------MB_8CDE30B8F20F4ED_1A2C_A3D4_webmail-d037.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii"
Thinking on it a bit, I= realized that what would probably happen at WOT when flying as opposed to= a ground run, is that my mp is going to decrease from 29.1  to a som= ewhat lower value, since the RPMs will increase up to ~6800 or so, up from= the 5200 at static WOT. So, I would be running at a lower MAP address tha= n the 106 that I see at WOT static. So, should I not richen the MAP values= BELOW 106, and a few adresses above it since I should see a little gain= in mp due to the ram effect of my air scoop?
 
Brian Trubee
 


 


-----Original Message-----
From: bktrub@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, May 17, 2011 4:49 pm
Subject: [FlyRotary] Re: Engine Tuning

Ed,
Attached is my map table as of today after I tuned it tied down  = ;on the ground. I have a 93 13BREW that is normally aspirated, it has 9.1/= 1 compression, swinging a catto 74 dia x 88 pitch prop through a 2.85/1 PS= RU. This EC2 is set up to accomodate turbo engines, so I have address= es that go up to 38 inHg. They are  not used.
 
 I generally idle at MAP address 11 mp of 14.9 inHg. at aro= und 1600rpm. This is a 60 degree day at barometer setting of 30.3. Advanci= ng the throttle, the EC2 switches over to the high RPM table at MAP a= ddress 17 (mp 17.2), going straight to address 80. My staging point is 84= (mp 19.1) from there up to full throttle, MAP address 106 mp 29.1, the tr= ansition is smooth. At full throttle on the ground I'm getting 5200 RPM.= When I go much past that RPM on takeoff, that's when the missing starts.= I'm still guessing that I need to richen up the mixture in the addresses= above 106.
 
Any input from anyone on this would be appreciated.
 
Brian Trubee
 


 


-----Original Message-----
From: Ed Anderson <eanders= on@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, May 13, 2011 3:18 pm
Subject: [FlyRotary] Re: Engine Tuning

 Brian, what values do you have in your fuel= map around 90-105?   I have values of 172 for WOT and at times= (cool OAT) I have to enrichen the mixture beyond that with the manual mix= ture control
 
Ed

Sent: Friday, May 13, 2011 5:35 PM
Subject: [FlyRotary] Engine Tuning


Since the weather has been cooperating lately, I've had the opportunity to= put a few more hours on the airplane. On the ground, I can go from an idl= e up to full throttle and the engine will be smooth. But when I take off,= it seems that as soon as I'm up a few hundred feet off the runway, I get= hellacious backfiring at full throttle. I can mitigate it a bit by thrott= ling back to about 5100 rpm, and turning the mixture knob to near full ric= h. It's getting to be a bit nerve wracking to take off thinking I've got= it smoothed out and then get a series of hand grenades going off under my= butt. I'm thinking that I'm still running too lean up at map address 106= or so. So, I go into the edit page and richen up the mixture around those= addresses. I think I'm creeping up on smooth full throttle running.
 
The good news is that my coolant runs at 175 degrees and oil at less-= so the cooling is more than effective, I just need to close up my air inl= et a bit or restrict the outflow.
 
Brian Trubee
=3D
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