X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from defout.telus.net ([204.209.205.55] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2784826 for flyrotary@lancaironline.net; Mon, 10 Mar 2008 03:17:13 -0400 Received-SPF: pass receiver=logan.com; client-ip=204.209.205.55; envelope-from=tomk@telus.net Received: from priv-edmwaa06.telusplanet.net ([216.232.147.131]) by priv-edmwes50.telusplanet.net (InterMail vM.7.08.02.00 201-2186-121-20061213) with ESMTP id <20080310071632.IMTA28448.priv-edmwes50.telusplanet.net@priv-edmwaa06.telusplanet.net> for ; Mon, 10 Mar 2008 01:16:32 -0600 Received: from familygr7vkfo2 (unknown [216.232.147.131]) by priv-edmwaa06.telusplanet.net (BorderWare MXtreme Infinity Mail Firewall) with SMTP id 93CGSTB6HR for ; Mon, 10 Mar 2008 01:16:32 -0600 (MDT) Message-ID: <067d01c8827e$af5ae900$6401a8c0@familygr7vkfo2> From: "Tom-Lynn Koftinoff" To: "Rotary motors in aircraft" References: Subject: Unusual Noise in Engine Date: Mon, 10 Mar 2008 00:16:38 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_067A_01C88244.0265EB80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_067A_01C88244.0265EB80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I am testing an '88, 13B, non turbo engine that I rebuilt according to = Tracy Crook's manual (Aviator's Guide to Mazda Rotary Conversions). I = did the rebuild, many years ago, before Tracy sold his rebuild kits, and = it's my first rotary that I rebuilt. I purchased my rebuild kit from = Dave Atkins. I am running it with Tracy's EC2 (purchased in '02), and = I wired the harness as per his plans. I fabricated my own intake = manifold. Presently, the motor is installed in an '86 Mazda RX-7 car. = I am using the transmission (i.e., most of the drivetrain) from the car, = to put a load on the engine (i.e., wheels are off the ground). The = fuel pump, fuel tank, battery, tach, coolant temp gauge, exhaust, = starter, is, stock, from the car. I have an external oil pressure = gauge, oil temp. gauge, ammeter, voltmeter, vacuum gauge, air/fuel = gauge, circuit breakers, and toggle switches. I didn't want to spend = any more money (i.e., purchasing Tracy's RD-1B, EM3, prop. etc.) on = the engine until I knew the engine was running adequately, and, = therefore, I am using the car as the test bed. The engine starts = fairly easy up here in B.C., Canada, on cold winter days, and I have = been running it, off and on, since late spring of '07. One of the = problems/issues I am trying to deal with is a random, intermittent noise = from the engine, when the engine is running cold. The noise sounds = like a coin on edge being tapped against some metal, such as a fender of = a car. After the engine warms up, and I run it up to 3000 - 6000 RPMs = I don't hear the noise. The engine hasn't used any oil, and I have run = approximately 40 gallons of gas through it. At very high RMPs (5000 to = 6000) I have placed the transmission into neutral because I have been = concerned about damaging the transmission/drive train. As a result of = running the engine with no load (i.e., transmission in neutral) on it, = at high RPM's, my plugs have fouled and stopped working or produced a = weak spark. Tracy has warned me that his EC2 was designed to run with = a propeller load, and my plugs will foul, if I don't run it with a load. = My question is regarding the noise that I hear. Has anyone = experienced such a noise? I have noticed the engine missing = sporadically at low RPM's with a load on it, and the fuel/air mixture = gauge showing five to six LEDS. Can a miss, detonation, bad timing, = fouled plug(s) etc cause such a noise? My timing is very close to 23 = degrees BTDC. When I turn the engine over manually (i.e., with socket = and ratchet) the engine feels like it has good compression, and doesn't = make any strange noises, such as, anything broken or loose inside. I = may tear the engine apart to inspect the inside, later this year. =20 Thanks, Tom ------=_NextPart_000_067A_01C88244.0265EB80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I am = testing an=20 '88, 13B, non turbo engine that I rebuilt according to Tracy Crook's = manual=20 (Aviator's Guide to Mazda Rotary Conversions).  I did the rebuild, = many=20 years ago, before Tracy sold his rebuild kits, and it's = my=20 first rotary that I rebuilt.   I = purchased my rebuild kit=20 from Dave Atkins.    I am running it with Tracy's EC2 = (purchased=20 in '02), and I wired the harness as per his = plans.  I=20 fabricated my own intake manifold.  Presently, the motor is = installed in an=20 '86 Mazda RX-7 car.  I am using the transmission (i.e., most = of the=20 drivetrain) from the car, to put a load on the engine (i.e., wheels = are off=20 the ground).   The fuel pump, fuel tank, battery,=20 tach, coolant temp gauge, exhaust, starter, is, stock, from = the=20 car.   I have an external oil pressure gauge, oil temp.=20 gauge, ammeter, voltmeter, vacuum gauge, air/fuel gauge, circuit = breakers,=20 and toggle switches.  I didn't want to spend any more money  = (i.e.,=20 purchasing Tracy's RD-1B, EM3, prop. etc.)    = on the=20 engine until I knew the engine was running adequately, and, therefore, I = am=20 using the car as the test bed.   The engine starts fairly = easy up=20 here in B.C., Canada, on cold winter days, and I have been running = it, off=20 and on, since late spring of '07.   One of the problems/issues = I am=20 trying to deal with is a random, intermittent noise from the engine, = when the=20 engine is running cold.   The noise sounds like a coin on = edge=20 being tapped against some metal, such as a fender of a car.   = After=20 the engine warms up, and I run it up to 3000 - 6000 RPMs I don't hear = the=20 noise.   The engine hasn't used any oil, and I have run = approximately=20 40 gallons of gas through it.   At very high RMPs (5000 to=20 6000) I have placed the transmission into neutral because I have = been=20 concerned about damaging the transmission/drive train.   As a = result=20 of running the engine with no load (i.e., transmission in neutral) on = it, at=20 high RPM's, my plugs have fouled and stopped working or produced a weak=20 spark.   Tracy has warned me that his EC2 was designed to run = with a=20 propeller load, and my plugs will foul, if I don't run it with a=20 load.   My question is regarding the noise that I hear.  = Has=20 anyone experienced such a noise?  I have noticed the = engine=20 missing sporadically at low RPM's with a load on it, and the fuel/air = mixture=20 gauge showing five to six LEDS.   Can a miss, detonation, = bad=20 timing, fouled plug(s) etc cause such a noise?  My timing = is very=20 close to 23 degrees BTDC.   When I turn the = engine=20 over manually (i.e., with socket and ratchet) the engine feels like it = has good=20 compression, and doesn't make any strange noises, such as, anything = broken or=20 loose inside.    I may tear the engine apart to = inspect the=20 inside, later this year.  
 
Thanks,
 
 
Tom
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