X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nskntmtas06p.mx.bigpond.com ([61.9.168.152] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTP id 6276149 for lml@lancaironline.net; Fri, 17 May 2013 09:40:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=61.9.168.152; envelope-from=frederickmoreno@bigpond.com Received: from nskntcmgw08p ([61.9.169.168]) by nskntmtas06p.mx.bigpond.com with ESMTP id <20130517133933.FWBO2028.nskntmtas06p.mx.bigpond.com@nskntcmgw08p> for ; Fri, 17 May 2013 13:39:33 +0000 Received: from Razzle ([58.166.236.242]) by nskntcmgw08p with BigPond Outbound id d1fX1l00G5EUVoi011fYgq; Fri, 17 May 2013 13:39:33 +0000 X-Authentication-Info: Submitted using ID frederick.moreno@bigpond.com X-Authority-Analysis: v=2.0 cv=FNuZNpUs c=1 sm=1 a=i+KtXejg5W0BtxHHO4S27w==:17 a=UfJMdoIk8jsA:10 a=JDadKst33uMA:10 a=8nJEP1OIZ-IA:10 a=1IlZJK9HAAAA:8 a=oJFe8stpGeIA:10 a=_48_oKZNNpXOE5AHy3QA:9 a=wPNLvfGTeEIA:10 a=pAMrN7boz1SyLSIF:21 a=MnlIGldL7jaxwBPw:21 a=8QqDBg1jo9zMe6Nzu8cA:9 a=_W_S_7VecoQA:10 a=XLQCz-7IMApbOmqe:21 a=h28CU_4d_D4vdjRK:21 a=DF69aJxMKozamNTx:21 a=x0mLEhdcI6ghJkqIEpcA:9 a=HXjIzolwW10A:10 a=dvIeMUh3dxkolpdY:18 a=i+KtXejg5W0BtxHHO4S27w==:117 MIME-Version: 1.0 Message-Id: <5196330A.000121.00588@RAZZLE> Date: Fri, 17 May 2013 21:39:22 +0800 Content-Type: Multipart/related; charset="iso-8859-1"; type="multipart/alternative"; boundary="------------Boundary-00=_M93YQG1IIA11VA400000" X-Mailer: IncrediMail (6395248) From: "Frederick Moreno" X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 To: "Lancair Mail (lml@lancaironline.net)" Subject: [LML] EGT/TIT Calibration - the MYTH --------------Boundary-00=_M93YQG1IIA11VA400000 Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_M93YLR6IIA11VA400000" --------------Boundary-00=_M93YLR6IIA11VA400000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Walter wrote:=0D =0D =0D "Fred:=0D =0D =0D The EGT Raw value is not important. We only care about the relationship = to peak EGT." =0D =0D I concur. Relationships of the temperature indications count, not the absolute, accurate, calibrated temperature number which is NOT displayed = on the instrument. Truly accurate measurement of gas temperature is not available with our instrumentation, so concern about calibration and=20 accurate" absolute values is misplaced. =0D =0D Colin asked: "Fred, About that TIT number. We care about this I guess mainly because it relates to turbine RPM which is what we really want to limit. Do you have any suggestions how to determine how close to abusing = the turbine you are coming?"=0D =0D =0D To which Walter replied: =0D =0D "The TIT raw number is important. The turbine is rated to withstand max R= PM at the TIT temp limit indefinitely. If the temp is above the limit at [th= at] RPM, blade creep will allow the blades to scrape against the housing.=20 Fortunately we rarely operate at max altitude requiring max turbine RPM, = so there is a tiny bit of wiggle room. How much wiggle room? We don't have any way to know from the cockpit."=0D =0D There you have it, from someone who knows.=0D =0D =0D <>=0D =0D =0D Walter kindly added: "While that's a logical explanation, that's not why the peak temps are different when coming from ROP or LOP. The reason is the change in volumetric efficiency of the cylinders due to the differenc= e in CHT, therefore a minor change in F:A ratio. If one leans slow enough, = the temps and volumetric efficiencies stabilize and the numbers will be the s= ame "=0D =0D I think we are saying the same thing, Walter. It takes a long time to co= me to equilibrium after a mixture, power, or speed change. CHTs are changin= g very slowly after a mixture adjustment for the reasons cited, and so the = EGT is drifting slowly to equilibrium for several minutes after your hand lea= ves the mixture knob. If you want "equilibrium values" (unchanging), wait a long time. =0D =0D But the data produced from a quicker scan is valuable because it is good enough to show which cylinder leans first, which second, etc at particula= r fuel flows so that "spread" can be evaluated. Again, the absolute value = of the EGT numbers, what Walter termed "raw value" displayed in the cockpit,= is not important, but the relationship between the numbers is. =0D =0D Remember: "better" is the enemy of "good enough."=0D =0D Fred --------------Boundary-00=_M93YLR6IIA11VA400000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Walter wrote:
 
 
"Fred:

The EGT Raw value is not imp= ortant.  We only care about the relationship to peak EGT." &nbs= p;
 
I concur.  Relationships of the temperature indi= cations count, not the absolute, accurate, calibrated temperature number = which is NOT displayed on the instrument.  Truly accurate measuremen= t of gas temperature is not available with our instrumentation, so concer= n about calibration and "accurate" absolute values is misplaced. <= /DIV>
 
Colin asked: "Fred, About that TIT num= ber.    We care about this I guess mainly because it relates to= turbine RPM which is what we really want to limit. Do you have an= y suggestions how to determine how close to abusing the turbine you are c= oming?"
 
 
To which Walter replied:
 
"The TIT raw number is impor= tant. The turbine is rated to withstand max RPM at the TIT temp limit ind= efinitely. If the temp is above the limit at [that] RPM, blade creep= will allow the blades to scrape against the housing.  Fortunately w= e rarely operate at max altitude requiring max turbine RPM, so there is a= tiny bit of wiggle room.  How much wiggle room?  We don't have= any way to know from the cockpit."
 
There you have it, from someone who knows.

<<Start rich, Lean down in steps wa= iting, say, one minute per step while you record data.  Then reverse= , going from lean back richer.  Then plot the data.  The curve = going leaner will not lie on top of the curve going richer.  Wh= y? Because when you took the reading, it was still changing, slowly, but = still changing.  It takes a lot of time and patience to get good [st= eady state] data. >>
 Walter ki= ndly added: "While that's a logical explanation, that's not why the peak =  temps are different when coming from ROP or LOP.  The reason i= s the change in volumetric efficiency of the cylinders due to the differe= nce in CHT, therefore a minor change in F:A ratio. If one leans slow enou= gh, the temps and volumetric efficiencies stabilize and the numbers will = be the same."
 
I think we are saying the same thing, Walter.  I= t takes a long time to come to equilibrium after a mixture, power, o= r speed change.  CHTs are changing very slowly after a mixture adjus= tment for the reasons cited, and so the EGT is drifting slowly to equilib= rium for several minutes after your hand leaves the mixture knob.  I= f you want "equilibrium values" (unchanging), wait a long time. 
 
But the data produced from a quicker scan is val= uable because it is good enough to show which cylinder leans first, = which second, etc at particular fuel flows so that "spread" can be e= valuated.  Again, the absolute value of the EGT numbers, what Walter= termed "raw value" displayed in the cockpit, is not important, but the r= elationship between the numbers is.
 
Remember: "better" is the enemy of "good enough."
 
Fred
 
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