X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 22 Jun 2005 13:46:58 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m24.mx.aol.com ([64.12.137.5] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1010024 for lml@lancaironline.net; Wed, 22 Jun 2005 10:54:25 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.5; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m24.mx.aol.com (mail_out_v38_r1.7.) id q.210.3529507 (14374) for ; Wed, 22 Jun 2005 10:53:32 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <210.3529507.2fead568@aol.com> X-Original-Date: Wed, 22 Jun 2005 10:53:28 EDT Subject: Re: [LML] Re: Induction air filter X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1119452008" X-Mailer: 9.0 Security Edition for Windows sub 5009 -------------------------------1119452008 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/22/2005 8:53:05 A.M. Central Standard Time, walter@advancedpilot.com writes: I think you meant a Lycoming IO-540? Yes, and that one will detonate easier than the above example. Same scenario. Actually it's one of the most detonation-prone engines in the fleet, the TIO-540J2BD Lycoming gets that award (Navajo Chieftan engine). Running one without an intercooler can routinely result in light detonation on takeoff at the FFs recommended by Lycoming. If run according to the POH, essentially the detonation margin is so narrow as to be essentially none. We have REAMS of data on that engine and use it as an example in the class. We run one and demonstrate detonation on it--in real time--every 60 days to a class of 40-60 students. It's not like I haven't watched this in real time on a running engine at least a couple of dozen times. Anyone who's been to the APS class has seen this. Walter, You are right, his engine is the 540. This engine is in an E-Racer with an unwaste-gated supercharger, no intercooler, fixed pitch prop, electronic ignition, electronic fuel injection with little or no pilot control over mixture and using augmenter tubes to help with engine cooling.. The parts do not talk to one-another. Takeoff is accomplished at reduced power. He has seen in excess of 40" MAP. He has de-constructed one or more pistons in the prior engine - detonation was the culprit. His new engine has something like 7:1 pistons. Nobody can convince him to at least normalize the blower. Oh well.......... <<<<<<< Both are on order. I guess I will switch from reading novels to novel reading. Thanks. Scott -------------------------------1119452008 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 6/22/2005 8:53:05 A.M. Central Standard Time,=20 walter@advancedpilot.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I think=20 you meant a Lycoming IO-540? Yes, and that one will detonate
eas= ier=20 than the above example. Same scenario. Actually it's one of=20
the most detonation-prone engines in the fleet, the TIO-540J2BD=20
Lycoming gets that award (Navajo Chieftan engine). Running one=20 without
an intercooler can routinely result in light detonation on tak= eoff=20 at
the FFs recommended by Lycoming. If run according to the POH,= =20
essentially the detonation margin is so narrow as to be essentially=20
none. We have REAMS of data on that engine and use it as an exam= ple=20 in
the class. We run one and demonstrate detonation on it--in re= al=20
time--every 60 days to a class of 40-60 students. It's not like=20= I=20
haven't watched this in real time on a running engine at least a coupl= e=20
of dozen times. Anyone who's been to the APS class has seen=20 this.

Walter,

You are right, his engine is the 540. This engine is in an E-Race= r=20 with an unwaste-gated supercharger, no intercooler, fixed pitch prop, electr= onic=20 ignition, electronic fuel injection with little or no pilot control ove= r=20 mixture and using augmenter tubes to help with engine cooling.. The pa= rts=20 do not talk to one-another. Takeoff is accomplished at reduced=20 power. He has seen in excess of 40" MAP. He has de-constructed o= ne=20 or more pistons in the prior engine - detonation was the culprit. His=20= new=20 engine has something like 7:1 pistons. Nobody can convince him to at=20 least normalize the blower. Oh well..........

<<<<<<<

Both are on order. I guess I will switch from reading novels to n= ovel=20 reading. Thanks.

Scott

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