Return-Path: Received: from [65.33.165.72] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WebUser 4.2b3) with HTTP id 3222791 for flyrotary@lancaironline.net; Sun, 09 May 2004 09:11:26 -0400 From: "Marvin Kaye" Subject: Re: [FlyRotary] Re: MPG Coolant To: "Rotary motors in aircraft" X-Mailer: CommuniGate Pro WebUser Interface v.4.2b3 Date: Sun, 09 May 2004 09:11:26 -0400 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit I doubt it. It's a propylene glycol product with some other additives, so I imagine it performs similarly to other PG chemistries. I never looked at that data, as there's not much I can do about it, given the materials issues we have with the engine. wrote: Thats interesting, Marv. Does it have the same thermal conductivity and specific heat as water? Dave Leonard > > I think what you're referring to is Evans NPG. We have to run it in the > Eagle540 because of the magnesium heads and intake manifold. It's a bit > pricey, at around $25/gal, and if you've had 50/50 water/anti-freeze in the > system you need to 1) flush & purge the system with clean water, 2) drain >well > and blow out with air, then 3) use the Evans "purge" fluid that binds with >the > last of the water in the system. 4) Drain that and fill with NPG. We had >to > send back a sample of coolant after the first engine run to verify that 99% >of > the water had been removed prior to filling... we did ok. What seems really > strange is to have a recommendation from Evans that says to use a zero psi > cap... although they did say it's ok to use one up to about 7psi if you >really > need to have a pressurized system. Interesting stuff. > > > > > > : > > One of the guys at the airport says that "all" the subaru guys are using > something called MPG instead of Ethylene Glycol/water because it boils at 290 > without need to be pressurized. > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html > >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html