Return-Path: Received: from fed1rmmtao08.cox.net ([68.230.241.31] verified) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3179303 for flyrotary@lancaironline.net; Mon, 19 Apr 2004 15:45:44 -0400 Received: from BigAl ([68.107.116.221]) by fed1rmmtao08.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040419194538.FBOP17557.fed1rmmtao08.cox.net@BigAl> for ; Mon, 19 Apr 2004 15:45:38 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: water coolant percentages Date: Mon, 19 Apr 2004 12:45:46 -0700 Message-ID: <000001c42646$e917bdf0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4260C.3CBB56F0" 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 V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4260C.3CBB56F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [FlyRotary] Re: water coolant percentages While my email provider (bellsouth) was banned from the list, Rusty wrote: >I also just found this table: >% CoolantFreezeBoil >20% 16 253 >33% 0 256 >40% -12 260 >50% -34 265 >70% -90 277 Hmmm. I'm using about 90% coolant / 10% tap water. What are the other flyers using? 90% ethylene-glycol (e-g) anti-freeze coolant is probably excessive. You are giving up a lot of specific heat, and increasing pumping power due to higher viscosity. Unless you live near the arctic, it is unlikely that you would ever need more than 50% e-g. I'd also suggest the phosphate-free premium anti-freeze. If you don't need the high freeze protection, I'd opt for corrosion inhibitors in a solution of maybe 25-30% e-g in water (for some increase in boiling point), and a pressure cap of 22-25 psig. I think Mopar used to make an inhibitor that included aluminum protection. Haven't checked lately. I'd think the local NAPA store would have something. I have maintained between 30 and 50 % anti-freeze in my old van (250,000 miles), and when replacing the water pump noted the inside surfaces in the coolant system were spotless - just a slight green tinge. Al ------=_NextPart_000_0001_01C4260C.3CBB56F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: water coolant percentages

 

While my email provider (bellsouth) was banned from the list, Rusty = wrote:

>I also just found this table:

>% CoolantFreezeBoil

>20%  16 253

>33%  0  256

>40% -12 260

>50% -34 265

>70% -90 277

 

Hmmm. I'm using about 90% coolant / 10% tap water.

 

What are the other flyers using?

 

90% = ethylene-glycol (e-g) anti-freeze coolant is probably excessive.  You are giving up = a lot of specific heat, and increasing pumping power due to higher viscosity. =  Unless you live near the arctic, it is unlikely that you would ever need more = than 50% e-g.  I’d also suggest the phosphate-free premium = anti-freeze.

 <= /font>

If you = don’t need the high freeze protection, I’d opt for corrosion inhibitors = in a solution of maybe 25-30% e-g in water (for some increase in boiling = point), and a pressure cap of 22-25 psig.  I think Mopar used to make an = inhibitor that included aluminum protection.  Haven’t checked = lately.  I’d think the local NAPA store = would have something.

 <= /font>

I have = maintained between 30 and 50 % anti-freeze  in my old van (250,000 miles), and = when replacing the water pump noted the inside surfaces in the coolant system = were spotless – just a slight green tinge.

Al

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