X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 15 Jan 2008 16:38:01 -0500 Message-ID: X-Original-Return-Path: Received: from smtp124.sbc.mail.re3.yahoo.com ([66.196.96.97] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with SMTP id 2646148 for lml@lancaironline.net; Tue, 15 Jan 2008 09:25:35 -0500 Received-SPF: none receiver=logan.com; client-ip=66.196.96.97; envelope-from=lorn@dynacomm.us Received: (qmail 27728 invoked from network); 15 Jan 2008 14:24:56 -0000 Received: from unknown (HELO ?192.168.1.64?) (lorn@ameritech.net@69.208.115.16 with plain) by smtp124.sbc.mail.re3.yahoo.com with SMTP; 15 Jan 2008 14:24:56 -0000 X-YMail-OSG: 9uEPQ_MVM1kHBSmVQMB1bYjdAXmPPjnSt_A3KNDvoX4jYZV3FjYdyxK.Z9lnyQjKF2kWexMMjddRZ_PAg9YYVnvbwPkKTUZqBow4nHGy2DeIeKRl9JEShwZI1NnsVx3jS9VLtQQOmOrT7FM- X-Original-Message-Id: From: Lorn H Olsen X-Original-To: Lancair List Content-Type: multipart/alternative; boundary=Apple-Mail-1-909079638 Mime-Version: 1.0 (Apple Message framework v915) Subject: Re: RPM drop X-Original-Date: Tue, 15 Jan 2008 09:24:55 -0500 X-Mailer: Apple Mail (2.915) --Apple-Mail-1-909079638 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit If you leave the mixture lean while you do your run up, the RPM will drop more than if you have a rich mixture. I do my run up lean. You might want to consider Iridium plugs. More fire, bigger gap. The price of the Iridium plugs has come down from $74 to $35. The run up is not the place to fully check the mags. A high RPM run up is just the place to chop up the prop. While in cruise flight, try the left and right mags. This really tells the tail. If the RPM drop is greater on the left mag, you should determine the problem and correct it. The problem could be the mag and/or its points, the wires or the plugs. If the mags are Slick 4200's they should be changed at 700 hours. If they are Slick 4300's they should be inspected and the points changed every 500 hours. I have switched to Cleveland wheels but with my Matco's I could always lock the wheels whenever I wanted to. > From: gerardoconnell@optusnet.com.au > Date: January 14, 2008 12:46:58 PM GMT-05:00 > > Running an 0-32O with 2 mags-frequently get a 200 RPM (or sometimes > greater) drop with roughness on the left Mag when doing run ups. > > Until recently I had the MATCO brakes installed I was unable to run > up much past 2000 RPM without creeping forward and thus the problem > was hard to clear. On applying full power for take off-the engine > runs a little rough for a couple of seconds then runs smooth. > > Obviously the cause is fouling-anyone care to add comments or > similar experiences? > > I always taxi with mixture leaned out to the max but mechanics can > be more careless when picking up aircraft for maintenance. > > What are your thoughts? -- Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us LNC2, FB90/92, O-320-D1F, 1,300 hrs, N31161, Y47, SE Michigan --Apple-Mail-1-909079638 Content-Type: text/html; charset=US-ASCII Content-Transfer-Encoding: quoted-printable
If you leave the mixture = lean while you do your run up, the RPM will drop more than if you have a = rich mixture. I do my run up lean. You might want to = consider Iridium plugs. More fire, bigger gap. The price of = the Iridium plugs has come down from = $74 to = $35.

The = run up is not the place to fully check the mags. A high RPM run up is = just the place to chop up the prop. While in cruise flight, try the left = and right mags. This really tells the tail.

If = the RPM drop is greater on the left mag, you should determine the = problem and correct it. The problem could be the mag and/or its points, = the wires or the plugs. If the mags are Slick 4200's they should be = changed at 700 hours. If they are Slick 4300's they should be inspected = and the points changed every 500 hours.

I have switched to = Cleveland wheels but with my Matco's I could always lock the wheels = whenever I wanted to.

Date: January 14, 2008 12:46:58 PM = GMT-05:00

Running an 0-32O with 2 = mags-frequently get a 200 RPM (or sometimes greater) drop with =  roughness on the left Mag when doing run ups.

Until = recently I had the MATCO brakes installed I was unable to run up much = past 2000 RPM without creeping forward and thus the problem was hard to = clear. On applying full power for take off-the engine runs a little = rough for a couple of seconds then runs smooth.

Obviously the = cause is fouling-anyone care to add comments or similar = experiences?

I always taxi with mixture leaned out to the max but = mechanics can be more careless when picking up aircraft for = maintenance.

What are your thoughts?
--
Lorn H. = 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, = Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC= 2, FB90/92, O-320-D1F, 1,300 hrs, N31161, Y47, SE = Michigan



= --Apple-Mail-1-909079638--