<VV> CHT guages

[corvair at mts.net]

Under-the-plug CHT gauges have been used on small aircraft engines forever. Like these ones here - $150 for a 6-cylinder kit for 14mm plugs:

http://www.aircraftspruce.com/catalog/inpages/westcombos.php

I believe the "probes" are actually the plug thermistors.

Les
----------------------
Message: 1
Date: Mon, 15 Aug 2005 13:11:16 -0400
From: "Bill Elliott" <Corvair at fnader.com>
Subject: Re: <VV> Re: Thermisters (Now plug depth)
To: "NicolCS at aol.com" <NicolCS at aol.com>,	"RoboMan91324 at aol.com"
	<RoboMan91324 at aol.com>,	"virtualvairs at corvair.org"
	<virtualvairs at corvair.org>
Message-ID: <200508151711.j7FHBIZS032089 at tiger.skiblack.com>
Content-Type: text/plain; charset="iso-8859-1"

On Mon, 15 Aug 2005 13:01:15 EDT, NicolCS at aol.com wrote:

><snip> I have always wondered if there is  any issue with sparkplug thread 
>depth when you use an under-the-plug  thermistor. Doc. <unsnip>
> 
>I've been reading and hearing about this carbon thing since the beginning  of 
>time, but, you know I've never actually experienced it.  I wonder if  it's 
>one of those myths that just develops a life of it's own.  
> 


I think the carbon buildups were more of a problem back in the "leaded" days... may vehicles 
had "pull and decoke" the heads on their standard service 
schedule.

I chase the threads every time I pull a plug out (really good practice when dealing with alloy 
heads) so I think others doing the same would be fine 
regardless.

Folks that "index" plugs add more dimensionally than the thin thermistor adds under the plug. A 
non-issue IMO.

Bill Elliott