X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mout.perfora.net ([74.208.4.195] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6785235 for flyrotary@lancaironline.net; Tue, 18 Mar 2014 11:06:59 -0400 Received-SPF: none receiver=logan.com; client-ip=74.208.4.195; envelope-from=patrick@hoffmann1.net Received: from [172.16.0.113] (173-161-59-84-Illinois.hfc.comcastbusiness.net [173.161.59.84]) by mrelay.perfora.net (node=mrus2) with ESMTP (Nemesis) id 0LvUlP-1X8mq52OIt-0105Fz; Tue, 18 Mar 2014 11:06:23 -0400 Subject: Re: [FlyRotary] Off Topic Lycoming Question... References: From: Patrick Content-Type: text/plain; charset=utf-8 X-Mailer: iPhone Mail (11D167) In-Reply-To: Message-Id: <8A0CA83D-2611-43CE-A78B-59E0EAEB16F0@hoffmann1.net> Date: Tue, 18 Mar 2014 10:05:52 -0500 To: Rotary motors in aircraft Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (1.0) X-Provags-ID: V02:K0:BFlCG5JTtsDC93h76CjTV5N76Bo0CcyyAhWyp5PMpQf 434j89QAFQ3ZYRJUWLUd9I+X6neWe4sPC9PvkST86vHBzDGEJT mwo3t23Z9/4vd4FPsJvIaXgnwpVgW0lwVyHZUFuQfuBNXwoscE iscN5m+d1MzX4OoTXm7faJiCCUGOHsjhZquyODC2J/Ey7cSEHT /5ux8FJuu17kdJD/hpTPm5Uv8a3IuUzrBdhJ7nHjuyrX5TuDHU +s58ZQdlsQi/WtNyKFaZKzlyPY59hwNV35efMAO67e8dk88yDr HVexynPndV2pljNvMJyAyzJU9BKO/Zcb9SSrx+D1S+Mj/Y7vQR xYL1QLWBt2ib/cI5eDn/8u7s9XfTwKWk5fGEOKekt9Hxn/POUY YxJB/GzTksXyg== Doug,=20 When you pull the mixture to cut-off while at idle, do the RPMs increase bri= efly before dropping? No rise means the carb is set too lean.=20 Patrick > On Mar 18, 2014, at 8:59 AM, dlomheim@aol.com wrote: >=20 > I have finally finished the restoration of an RV-3A that sat for 12+yrs in= a hanger here in OK. After to flights now I have two engine issues I'd lov= e to have some feedback on from the smart engine guys on the list! I'm runn= ing an O-290G that has been modified to a "D" config. Minus the crankshaft. = The airboat guys run this engine w/the timing at 28 deg. (Vs 26 deg) BTDC a= nd it has the original Marvel 3A carb that it flew w/for it's first 150 hrs.= My two big issues are the EGT is constantly redlined at RPMs above 2300. I= attempted leaning it on the last flight, and it didn't drop the temps at al= l. Additionally, the CHT has never hit more than 200 degrees and it has a s= parkplug sender which I have read should read about 40 higher than actual if= using a bayonet style in the cylinder barrel. Anyway, I need to verify the= temp calibration of the gauges, but I wonder if there is something on the s= park / timing side I also should consider here as I trouble-shoot it further= ... > Thx for any ideas! =20 >=20 > Doug Lomheim > RV-3A flying!=20 > RV-9A w/13B ready for some attention this Summer! > Sent on the Sprint=C2=AE Now Network from my BlackBerry=C2=AE=20 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html