Q: about various types of EGT probes.

[Jess Gypin]

Westach makes some very nice EGT gauges. I use a combo EGT/AF meter in my
turbo Miata. They can be seen at http://www.aircraftspruce.com and they also
have some other ones that are not as pricey.

Jess
----- Original Message -----
From: "Fran and Bud" <quest100 at gte.net>
To: <diy_efi at diy-efi.org>
Sent: Thursday, September 06, 2001 22:35 PM
Subject: Re: Q: about various types of EGT probes.


> Mike,
> The letter designation describes the Type of the thermocouple and its
normal
> range.
> "J" and "K" are pretty common (US). Also B, C, E, N, R, S, T.
>
> "J" is made of Iron (+) (White) and Constantan (-) (Red) and has a useful
> range of about 200 to 1400 F.
>
> "K" is made of Chromel (+) (Yellow) and Alumel (-) (Red) and has a useful
> range of about 200 to 2300 F.  MOST APPROPRIATE FOR RACE CARS (opinion,
not
> fact).
>
> We use a "K" in each of the collectors (2) of a Bonneville car and they
read
> 1350 nominal on a dashboard pyro gauge when the engine is fat - and will
> climb fast as/if it goes lean.
> Note:  This is in 3 1/2 inch collectors 3 feet from the cylinder head -
> not right at exhaust port as in data logging of each cylinder..
>
> Parts for a typical lo-buck approach (non data logger) should cost
somewhere
> around:
> Dash Gauge 125 to 150 US;  Thermocouple 25 to 35 US each; Extension leads
> (same materials as thermocouple)15 to 20 US each.
> (Dont extend leads with copper wires, creating additional dissimilar metal
> junctions)
>
> Most common automotive application is for Diesel Big Rigs, and if you have
> access to
> a friendly big rig parts house or a big rig wrecking yard you could get
> lucky and come up with
> an inexpensive system that will tell you a lot about how the engine is
> running.
> HTH
> Bud
>
> ----------
> >From: "Diehl, Jeffrey" <jdiehl at sandia.gov>
> >To: "'diy_efi at diy-efi.org'" <diy_efi at diy-efi.org>
> >Subject: Q: about various types of EGT probes.
> >Date: Thu, Sep 6, 2001, 11:54 AM
> >
>
> >Hi all,
> >
> >I'm looking into putting one or more exhaust temp probes in one of my
cars.
> >While pricing the probes, I was asked what type of probe I need.  Quick
> >research on the Web revealed that these probes are designated as K-type,
> >J-type, N-type, etc.  Does anyone know what this refers to?  Is it form
> >factor, or electrical characteristics, for example?
> >
> >Any source of information on the topic would be most appreciated.
> >
> >Thanx,
> >Mike Diehl,
> >
> >
> >
> >
>
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