Received-SPF: pass
 receiver=logan.com; client-ip=74.125.92.26; envelope-from=david.staten@gmail.com
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=message-id:date:from:user-agent:mime-version:to:subject:references
         :in-reply-to:content-type:content-transfer-encoding;
        b=q+6YDfks7er9nuKcotm74VIku2IFcH0a26R68Ji2S6b+iJbJ4A/R/8cXYmcWV7/Fng
         341f90T/CliP+ofoEUMvCLBgNSNKxktfL15I5BfYoOAN1I9uLzmGzXcEMWde69LQA1Qm
         8TpEjw3ft7MYg/nzO6aIhkiIUxAl6jQZKe0ds=
Message-ID: <4B52506D.4050103@gmail.com>
Date: Sat, 16 Jan 2010 17:49:01 -0600
From: Dave <david.staten@gmail.com>
User-Agent: Thunderbird 2.0.0.23 (Windows/20090812)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Mechanical gages
References: <list-4084718@logan.com>
In-Reply-To: <list-4084718@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Lynn Hanover wrote:
> I was asking summit racing about their mechanical gauges, wondering if 
> the price included all the necessary parts.  they told me that the oil 
> pressure and water temp hook up directly with an 1/8th" line that I 
> cut to fit.  I questioned whether the water temp would work that way 
> since water wouldn't be circulating through the line.  do mechanical 
> temperature gauges work that way?  I assumed there must be a sealed , 
> fixed length bulb/line arrangement that converts temp into line pressure?
> what are the pros/cons of using mechanical vs. electrical gauges?  I 
> have some of them currently in my plane but will need gauges to run 
> the engine initially for ground tests, and hate to pay for duplicates, 
> so leaning towards the cheaper mechanical gauges.    
>  
>  kevin
>  
>  
Kevin, The temp gauge needs to have a probe sticking into the 
circulation. Doesnt have to stick far into it, but the area you are 
measuring the fluid temp of needs to be representative of the 
circulating fluid, not whats at the end of a dead end tube.

Our oil temp sensor is after the oil cooler (coolest point for the most 
point), and before the oil filter. We used a remote mount filter with 
oil inlets and outlets on each side. So.. one of the unused inlets has a 
temp probe in it and one of the outlets has a blind plug in it.

Cant remember exactly where we decided to measure water jacket temp, but 
its at the hottest point, so likely on the way to the radiator after the 
water pump...