Don't confuse MPG with NPG they are two very different fluids.  I would go with NPG if it weren't for the fact that it would be hard to replace if you had to do any field repairs a long way from home.

Mike

At 11:51 2004-05-08, you wrote:

David,
 
"the performance is not really significantly better" doesn't seem to be even close to the facts - the performance is much WORSE, as Ed A just pointed out.  The point is, you need a significantly bigger cooling system - &/or cooling system heat rejection capacity - if you use MPG.  This was discussed extensively a year or two ago.  It is not a good idea.  Check it out further before you commit to it.
 
I'm going to use "environment friendly" water, plus John Deere Coolant Conditioner (lower cost equivalent to motorcycle trade's Water Wetter) for max heat transfer in 6 warm months and 50/50 normal antifreeze when freezing level drops.
 
I looked in my e-mail "hard copy" files and found one from Ed March 30 1999 summarizing same conclusions.  Chuck harbert wrote March 29, 1999 that "NPG gets very viscous at below freezing temps and therefore should not be used where air temps are below 10-15deg F.  What happens is that the NPG won't move thru the rad and the engine overheats."
 
David Carter
 
----- Original Message -----
From: daveleonard@cox.net
To: Rotary motors in aircraft
Sent: Saturday, May 08, 2004 1:30 PM
Subject: [FlyRotary] Re: MPG Coolant

That's funny.  I did a similar search and seemed to discover that the performance is not really significantly better but I will probably use it from now on for its environmental properties. 

The same search did convince me of the benifical properties of water wetter, so I ordered some of that :-)

Thanks,
Dave

> Subject: [FlyRotary] Re: MPG Coolant
>
> Dave,
> I did a search on the web, and the MPG coolant is Mono Propylene Glycol.  It
> is the non-toxic anti-freeze, and apparently it does have a much higher
> boiling point.  Both Sierra and Amsol make one.  After reading about it, I'm
> definitely going to get some.
>
> Steve Brooks
> Cozy MKIV 13BT
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
> Behalf Of daveleonard@cox.net
> Sent: Saturday, May 08, 2004 12:44 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] MPG Coolant
>
>
> 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.
>
> Does anyone know anything about that stuff?
>
> Dave Leonard
>
>
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