Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 609537 for flyrotary@lancaironline.net; Sun, 16 Jan 2005 20:07:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050117010638.SXBW2042.imf18aec.mail.bellsouth.net@rd> for ; Sun, 16 Jan 2005 20:06:38 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Need Advise Date: Sun, 16 Jan 2005 19:06:39 -0600 Message-ID: <000001c4fc30$cc89cff0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4FBFE.81EF5FF0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4FBFE.81EF5FF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I am wondering if being overfull was the cause. Being overfull certainly won't help. If the oil gets high enough to get back on the oil pump chain, or counterweight, it will get foamed up, and that helps it escape. Did you run the engine any with the plane parked = on it's nose? On deceleration (belly brake ?), do you think you could be sloshing oil forward=20 Originally there was a tube from the crankcase vent to a fitting on the side of the filler tube. =20 =20 Now I'm confused. How many vents do you have? You only need one, = usually the one on the filler tube. All this does is keep the pan area from = being a sealed container, to allow room for expansion and contraction when the = oil heats up. It will also vent off any combustion pressure that gets by = the side seals. =20 =20 The only time I ever got any significant oil discharge is when I = happened to put the vent line in a low pressure area with lots of airflow. It = seemed to suck it out under those conditions, but moving the vent to another point stopped it. It sounds like your vent line is still inside the cowl, but = is it in an area that might be getting a lot of airflow, causing a negative pressure? =20 =20 Glad to hear the temps are behaving, but at twice around the pattern = every weekend, you're going to beat my longest time to 40 hours record :-) =20 Cheers, Rusty =20 ------=_NextPart_000_0001_01C4FBFE.81EF5FF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I am wondering if being overfull was the = cause.

Being = overfull certainly=20 won't help.  If the oil gets high enough to get back on the oil = pump chain,=20 or counterweight, it will get foamed up, and that helps it escape.  = Did you=20 run the engine any with the plane parked on it's nose?  On = deceleration=20 (belly brake ?), do you think you could be sloshing oil forward=20

Originally there was a tube from the crankcase vent = to
a=20 fitting on the side of the filler tube. 
 
Now I'm = confused. =20 How many vents do you have?  You only need one, usually the one on = the=20 filler tube.  All this does is keep the pan area from being a = sealed=20 container, to allow room for expansion and contraction when the oil = heats=20 up.  It will also vent off any combustion pressure that gets by the = side=20 seals.  
 
The only = time I ever got=20 any significant oil discharge is when I happened to put the vent = line in a=20 low pressure area with lots of airflow.  It seemed to = suck it out=20 under those conditions, but moving the vent to another point stopped = it. =20 It sounds like your vent line is still inside the cowl, but is it in an = area=20 that might be getting a lot of airflow, causing a negative=20 pressure?  
 
Glad to = hear=20 the temps are behaving, but at twice around the pattern every=20 weekend, you're going to beat my longest time to 40 hours record=20 :-)
 
Cheers,
Rusty
 
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