Received-SPF: softfail
 receiver=logan.com; client-ip=64.102.122.149; envelope-from=echristley@nc.rr.com
Message-ID: <44B65632.5010205@nc.rr.com>
Date: Thu, 13 Jul 2006 10:18:26 -0400
From: Ernest Christley <echristley@nc.rr.com>
Reply-To: echristley@nc.rr.com
User-Agent: Mozilla Thunderbird 1.0.7-1.4.1 (X11/20050929)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: heater
References: <list-1233767@logan.com>
In-Reply-To: <list-1233767@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

James Maher wrote:

> Ernest.
> My oil temp generally runs 10C degrees cooler than the coolant 
> temperature.
> This is actually very desirable as the oil red line is 210F while the 
> coolant can go much higher.
> Also it will take longer for the oil to heat up than the coolant as 
> it's thermostat is activated at 140F degrees allowing flow through the 
> cooler, while the coolant thermostat is usually at 180F, if you  have 
> one installed.
> Having said all that, I am currently using my oil cooler exhaust air 
> for cabin heat just because it was easier to do, since the oil cooler 
> is mounted to the firewall and has its own fresh air inlet and outlets.
> Jim


Now I'm torn, Jim.  I'm arranging one of the water coolers on one side 
of the cockpit, and the oil cooler on the other.  At this point, it 
doesn't matter if I pull the hot air off of one or the other.  I could 
pull it off of both, but I only want want to do one side right now for 
simplicity sake.  I'm going to take fresh air off the front side of the 
heat exhanger, heat off the back side and run it through a mixer, so I 
expect to spend some hours putting all that together.

I believe your numbers are atypical.  Most guys are seeing higher oil 
than water temps.  But I believe that will be an installation specific 
condition.  I'll be running without a thermostat.  The water has a lot 
more thermal mass than the oil, so I expect the oil to come up to temp 
much faster.  I'm planning a sliding door to cut the airflow through the 
strake mounted ducts, so it probably won't matter.  I can get the temps 
up quickly on either one.  But I still think the oil will get hotter 
faster than the water.

-- 
         ,|"|"|,              Ernest Christley       |
----===<{{(oQo)}}>===----    Dyke Delta Builder      |
        o|  d  |o        http://ernest.isa-geek.org  |