X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 13 Jun 2013 07:36:08 -0400 Message-ID: X-Original-Return-Path: Received: from nm9.bullet.mail.ne1.yahoo.com ([98.138.90.72] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6322819 for lml@lancaironline.net; Thu, 13 Jun 2013 06:32:55 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.90.72; envelope-from=casey.gary@yahoo.com Received: from [98.138.226.177] by nm9.bullet.mail.ne1.yahoo.com with NNFMP; 13 Jun 2013 10:32:20 -0000 Received: from [98.138.89.246] by tm12.bullet.mail.ne1.yahoo.com with NNFMP; 13 Jun 2013 10:32:20 -0000 Received: from [127.0.0.1] by omp1060.mail.ne1.yahoo.com with NNFMP; 13 Jun 2013 10:32:20 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 370871.5651.bm@omp1060.mail.ne1.yahoo.com Received: (qmail 19334 invoked by uid 60001); 13 Jun 2013 10:32:20 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; 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Thu, 13 Jun 2013 03:32:19 PDT X-Rocket-MIMEInfo: 002.001,U291bmRzIGxpa2UgdGhlIHRpbWluZyBpcyBtb3JlIGFkdmFuY2VkIG9uIHRoZSBFSSB0aGFuIHRoZSBtYWcuIMKgSSdkIHJlY29tbWVuZCBjaGVja2luZyB0aGUgbWFnIHRpbWluZyB0byB2ZXJpZnkgdGhhdCBpdCBpcyBhdCB0aGUgcHJvcGVyIHNldHRpbmcuIMKgRHVyaW5nIHRoZSBydW51cCB0aGUgRUkgY291bGQgYmUgYWR2YW5jaW5nIHRoZSB0aW1pbmcgZnJvbSB0aGUgYmFzZSBzZXR0aW5nLCBhcyB0aGUgbWFuaWZvbGQgcHJlc3N1cmUgaXMgcmVsYXRpdmVseSBsb3cuIMKgSSdtIG5vdCBzdXJwcmlzZWQBMAEBAQE- X-Mailer: YahooMailWebService/0.8.146.552 References: X-Original-Message-ID: <1371119539.15384.YahooMailNeo@web120106.mail.ne1.yahoo.com> X-Original-Date: Thu, 13 Jun 2013 03:32:19 -0700 (PDT) From: Gary Casey Reply-To: Gary Casey Subject: Re: EGT on runup X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-96787742-56290460-1371119539=:15384" ---96787742-56290460-1371119539=:15384 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sounds like the timing is more advanced on the EI than the mag. =C2=A0I'd r= ecommend checking the mag timing to verify that it is at the proper setting= . =C2=A0During the runup the EI could be advancing the timing from the base= setting, as the manifold pressure is relatively low. =C2=A0I'm not surpris= ed that there is very little drop when running EI only - it's a function of= the timing, not the "strength" of the spark. =C2=A0And I agree with the re= ply that suggested upping the warning limit - 1475 is very low. =C2=A0I hav= e mine set at 1500 and I should raise it to prevent co-pilot anxiety. =C2= =A0Another suggestion: Play around with the mixture during the runup - I fi= nd that I get a more consistent result with the mixture a little lean. =C2= =A0Full rich and very lean mixtures will give high mag drops.=0AGary=0A=0AH= ello all,=0A=C2=A0=0AHope you don=E2=80=99t mind I may be a pain in the but= t for a=C2=A0 while.=C2=A0 I=E2=80=99m breaking in this new Barrett Precisi= on Engines=C2=A0 TSIO 550 and hope some of you won=E2=80=99t mind answering= niggling questions that will come up as I go through the process.=C2=A0 I = have about 6.5 hours on it now and the CHT=E2=80=99s are coming down nicely= .=C2=A0 Still running full rich and cycling the power in cruise from about = 33 inches MAP down to 25=E2=80=9D in gradual increments.=C2=A0 Today I got = to 12,500 and stayed there about an hour with CHT=E2=80=99s never going to = 400 and after the initial climb and level off, they stayed below 380.=C2=A0= Previous flights, I could not seem to keep #3 below 400 above about 10,000= ft, even when powering back.=C2=A0 So it looks like the rings are seating = well and break in is on track.=0A=C2=A0=0AI did notice one thing that I don= =E2=80=99t recall seeing before during engine run up before takeoff.=C2=A0 = The EGT=E2=80=99s all went to caution temps when I switched to the MAG at 1= 700 RPM.=C2=A0 The drop on the MAG has been a bit high =E2=80=93 usually ov= er 100 RPM and inconsistent.=C2=A0 Sometimes it could be 95 RPM and it has = been as high as 145 RPM.=C2=A0 Today I think=C2=A0=C2=A0 it was close to th= e higher number.=C2=A0 I have the EGT caution warning go off at 1475.=C2=A0= I know that=E2=80=99s not particularly high but it=E2=80=99s the first tim= e bitching Betty has gone ballistic six times in a row in short order like = that.=C2=A0 As expected there is no drop on the Lightspeed ignition and the= EGT=E2=80=99s don=E2=80=99t seem to change much when selecting only that i= gnition source.=0A=C2=A0=0AAny thoughts on that?=0A=C2=A0=0ARegards,=0A=C2= =A0=0AJohn Barrett, CEO ---96787742-56290460-1371119539=:15384 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Sounds like th= e timing is more advanced on the EI than the mag.  I'd recommend check= ing the mag timing to verify that it is at the proper setting.  During= the runup the EI could be advancing the timing from the base setting, as t= he manifold pressure is relatively low.  I'm not surprised that there = is very little drop when running EI only - it's a function of the timing, n= ot the "strength" of the spark.  And I agree with the reply that sugge= sted upping the warning limit - 1475 is very low.  I have mine set at = 1500 and I should raise it to prevent co-pilot anxiety.  Another sugge= stion: Play around with the mixture during the runup - I find that I get a = more consistent result with the mixture a little lean.  Full rich and = very lean mixtures will give high mag drops.
Gary

Hello all,
 
Hope you don=E2=80=99t mind I may be a pain in the butt for a = while.  I=E2=80=99m breaking in this new Barrett Precision Engines&nb= sp; TSIO 550 and hope some of you won=E2=80=99t mind answering niggling que= stions that will come up as I go through the process.  I have about 6.= 5 hours on it now and the CHT=E2=80=99s are coming down nicely.  Still= running full rich and cycling the power in cruise from about 33 inches MAP= down to 25=E2=80=9D in gradual increments.  Today I got to 12,500 and= stayed there about an hour with CHT=E2=80=99s never going to 400 and after= the initial climb and level off, they stayed below 380.  Previous fli= ghts, I could not seem to keep #3 below 400 above about 10,000 ft, even whe= n powering back.  So it looks like the rings are seating well and break in is on track.
 
I did notice one thing that I don=E2=80=99t = recall seeing before during engine run up before takeoff.  The EGT=E2= =80=99s all went to caution temps when I switched to the MAG at 1700 RPM.&n= bsp; The drop on the MAG has been a bit high =E2=80=93 usually over 100 RPM= and inconsistent.  Sometimes it could be 95 RPM and it has been as hi= gh as 145 RPM.  Today I think   it was close to the higher n= umber.  I have the EGT caution warning go off at 1475.  I know that=E2=80=99s not pa= rticularly high but it=E2=80=99s the first time bitching Betty has gone bal= listic six times in a row in short order like that.  As expected there= is no drop on the Lightspeed ignition and the EGT=E2=80=99s don=E2=80=99t = seem to change much when selecting only that ignition source.
 
Any thoughts on that?
 
Regards,=
 
John Barrett, CEO
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