REFLECTOR: Carb Temp Gauge

[aminetech at bluefrog.com]

That's a good idea, Larry.  I'll do some checking on the ground loop first.  Kurt, I spoke with RMI a few years back about the CHT problem.  The wire terminals at the connector were soldered and he told me that takes the spring out of the connectors and causes a weak connection.  I rewired it, but no improvement.  I did fix a bad oil pressure reading by isolating the instrument ground, but no help to the CHTs.

John

--- lwcoen at hotmail.com wrote:

From: "Laurence Coen" <lwcoen at hotmail.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: Carb Temp Gauge
Date: Sat, 1 Jan 2011 12:44:04 -0600

John,

Since you can buy the Westach for under $140 complete with a probe that also 
includes a warning light that isn't offered on the Mid-Continent, that's the 
way I'd go for a replacement.  That being said, you might have a ground loop 
problem with the installation of the RMI unit.  The fact that your CHT 
readings were also unstable on the RMI is telling you something.

Larry Coen
N136LC

--------------------------------------------------
From: <aminetech at bluefrog.com>
Sent: Friday, December 31, 2010 9:10 AM
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: REFLECTOR: Carb Temp Gauge

> I have a Mid-Continent carb temp probe installed and connected to my RMI 
> monitor.  In the past, readings were very unstable.  For the past year the 
> reading remained at the highest value (19 C).  I ran new wires (16 ga per 
> recommendation of Mid-Continent) and now the readings are back to 
> unstable.  I had unstable CHT readings also (RMI monitor) and after 
> several unsuccessful attempts to correct this, I bought a new CHT gauge 
> and that solved the problem.  Now I'm thinking of installing a carb temp 
> gauge as well.  Mid-Continent recommends their gauge for the best results. 
> It's pricey at $436.
>
> http://www.aircraftspruce.com/catalog/inpages/carbtempkit.php
>
> Westach has several, much less expensive gauges.
>
> http://www.aircraftspruce.com/catalog/inpages/carbAirTemp.php
>
> This one shows 9800 ohms in the description.  The Mid-Continent probe 
> reads 99 ohms at 20 C.  I don't know if this is revelant or not.  Can 
> someone tell me if the Westach will work, or do I need the Mid-Continent 
> gauge.
>
> Thanks,
>
> John
>
>
>
>
>
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