X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from QMTA12.emeryville.ca.mail.comcast.net ([76.96.27.227] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3843989 for flyrotary@lancaironline.net; Thu, 10 Sep 2009 02:13:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.27.227; envelope-from=n3773@comcast.net Received: from OMTA12.emeryville.ca.mail.comcast.net ([76.96.30.44]) by QMTA12.emeryville.ca.mail.comcast.net with comcast id etqT1c0020x6nqcACuDL57; Thu, 10 Sep 2009 06:13:20 +0000 Received: from rv8 ([71.236.188.91]) by OMTA12.emeryville.ca.mail.comcast.net with comcast id euDK1c0041ylVyX8YuDKLA; Thu, 10 Sep 2009 06:13:20 +0000 Message-ID: Reply-To: "kevin lane" From: "kevin lane" To: "flyrotary" Subject: cooling plumbing design [right?, right?, right? :-) ] Date: Wed, 9 Sep 2009 23:02:07 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01CA31A1.8DF85BC0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0015_01CA31A1.8DF85BC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I was embarrassed to ask about this originally, but it seems I am not = alone with questions. having viewed several flying cooling system flow = designs at the rotary round-up, perhaps it isn't that critical. one aspect I trying to understand is the expansion tank. there = shouldn't a big flow thru there, right? if the pressure is greatest at = this far rotor housing top port, then it must be lower in the expansion = tank, and a slow flow will take place towards the expansion tank, right? = the small diameter line will tend to push bubbles thru and they will = separate in the expansion tank. so, if they enter the tank above water = level, this line will suck air from the expansion tank as the cooling = fluid cools and has a lesser volume, right? not good. if the expansion = tank feeds the cooling circulation system by T'ing into the water pump = output, then it is all on the higher pressure side of the system, and = the air in the expansion tank won't have a tendency to be sucked into = the circulation? is the design intention to keep the expansion tank = under pressure, rather than have it part of the flow [circulation]? = if the expansion tank was plumbed into the water pump inlet port, then a = second circulation route is created, which doesn't involved the radiator = [rear rotor port to tank to water pump, thru engine block to rear = port....], right? as far as the bubble line for the radiator it seems that it would work = by allowing trapped bubbles in the higher end of the radiator to travel = uphill to the expansion tank. is the pressure at the radiator also = higher, as with the rear port? enough questions. clear as mud, right? kevin ------=_NextPart_000_0015_01CA31A1.8DF85BC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I was embarrassed to ask about this = originally,=20 but it seems I am not alone with questions. having viewed several = flying=20 cooling system flow designs at the rotary round-up, perhaps it isn't = that=20 critical.

one aspect I trying to = understand is the=20 expansion tank. there shouldn't a big flow thru there, = right? if the=20 pressure is greatest at this far rotor housing top port, then it must be = lower=20 in the expansion tank, and a slow flow will take place towards the = expansion=20 tank, right? the small diameter line will tend to push = bubbles thru=20 and they will separate in the expansion tank. so, if they enter the = tank=20 above water level, this line will suck air from the expansion tank = as the=20 cooling fluid cools and has a lesser volume, right? not good. = if the=20 expansion tank feeds the cooling circulation system by T'ing into the = water pump=20 output, then it is all on the higher pressure side of the system, and = the air in=20 the expansion tank won't have a tendency to be sucked into the=20 circulation? is the design intention to keep the expansion tank = under=20 pressure, rather than have it part of the flow = [circulation]? =20 if the expansion tank was plumbed into the water pump inlet port, then a = second=20 circulation route is created, which doesn't involved the radiator [rear = rotor=20 port to tank to water pump, thru engine block to rear port....],=20 right?

as far as the bubble line for the = radiator it=20 seems that it would work by allowing trapped bubbles in the higher end = of the=20 radiator to travel uphill to the expansion tank. is the pressure = at the=20 radiator also higher, as with the rear port?

enough questions. clear as mud,=20 right? kevin

------=_NextPart_000_0015_01CA31A1.8DF85BC0--