X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 29 Mar 2007 16:51:54 -0400 Message-ID: X-Original-Return-Path: Received: from [68.98.211.24] (HELO systems3.net) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1950060 for lml@lancaironline.net; Thu, 29 Mar 2007 11:05:10 -0400 Received-SPF: none receiver=logan.com; client-ip=68.98.211.24; envelope-from=cberland@systems3.net Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C77213.93D76842" X-MimeOLE: Produced By Microsoft Exchange V6.5 Subject: [LML] Re: Thielert Diesel Centurion 4.0 X-Original-Date: Thu, 29 Mar 2007 08:04:39 -0700 X-Original-Message-ID: <87C33F695961494D886EB3B6C8A4765125687B@s3server.Systems3.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: Thielert Diesel Centurion 4.0 Thread-Index: AcdxwEqzm4RvcTx+TQakluIssv3E8gAT0Ntw From: "Craig Berland" X-Original-To: "Lancair Mail List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C77213.93D76842 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable George, there are several diesel attributes that I find less than desirable, but one of the least desirable is its ability to make baby diamonds in the oil. OK, not really diamonds but carbon. The carbon is extraordinarily abrasive, requiring oil changes at very short intervals or a 55 gallon oil sump. Finally, and a little humorous, a diesel does not have a throttle or spark plugs. Sounds good, right? The only reason a diesel makes more or less power is the result of turning a "fuel metering valve" inside the injection pump. I personally have seen a metering valve jam at full power. The car was setting on the emission lab floor in the GM Test Lab in Denver, CO. The engineer who started the car panicked, took the keys out of the "ignition" (term loosely used), threw them and ran away. While the engine was rev limited by valve float, another engineer went over and disconnected the fuel supply line. No, it was not me. I was hiding under a desk. My point......there is only one way to shut down a diesel. Turn the fuel off. Well I guess if you had a sleeping bag laying around you could stuff it into the intake. Doing so in flight might be a little tricky. Craig Berland =20 EITHER WAY - - - you end up with an ENGINE that may have a BSFC of around 0.36 to 0.37 (compared to 0.38 to 0.39 for a same horsepower spark ignition engine ) .=20 =20 However - - whatever fuel efficiency is realized - - - is most likely MORE THAN OFFSET by the additional cooling drag requirements. =20 End result - - - it likely takes more pounds of fuel to get you from A to B - - or more Hp to get you the same air speed. =20 Regards, George =20 =20 =20 ------_=_NextPart_001_01C77213.93D76842 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

George, there are several diesel attributes that I find less = than=20 desirable, but one of the least desirable is its ability to make baby = diamonds=20 in the oil. OK, not really diamonds but carbon. The carbon = is=20 extraordinarily abrasive, requiring oil changes at very short intervals = or a 55=20 gallon oil sump. Finally, and a little humorous, a diesel does not = have a=20 throttle or spark plugs. Sounds good, right? The only reason = a=20 diesel makes more or less power is the result of turning a "fuel = metering valve"=20 inside the injection pump. I personally have seen a metering valve = jam at=20 full power. The car was setting on the emission lab floor in the = GM Test=20 Lab in Denver, CO. The engineer who started the car panicked, took = the=20 keys out of the "ignition" (term loosely used), threw them and ran = away. =20 While the engine was rev limited by valve float, another engineer went = over and=20 disconnected the fuel supply line. No, it was not me. I was = hiding=20 under a desk. My point......there is only one way to shut down a = diesel. =20 Turn the fuel off. Well I guess if you had a sleeping bag laying = around=20 you could stuff it into the intake. Doing so in flight might be a = little=20 tricky. <grin>

Craig Berland

EITHER = WAY - -=20 - you end up with an ENGINE that may have a BSFC of around 0.36 to = 0.37 (compared to 0.38 to 0.39 for a same horsepower spark = ignition engine=20 ) .

However - - = whatever=20 fuel efficiency is realized - - - is most likely MORE THAN OFFSET = by the=20 additional cooling drag requirements.

End result - = - - it=20 likely takes more pounds of fuel to get you from A to B - - or = more Hp to=20 get you the same air speed.

Regards, =20 George

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