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From: <daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: MPG Coolant
Date: Sun, 9 May 2004 0:58:54 -0400
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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.
> 
>      <Marv>
> 
> 
> 
> <daveleonard@cox.net>:
> 
> 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.
> 
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