Excessive EGT Probe length?

SIKDMAX

SIKDMAX

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Sep 14, 2007
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Installed my EGT Probe the other day and it just wasnt long enough to get from passenger manifold to my steering column. I need about 4 more feet. I ordered a 3 meter Type K EGT extension from this company: (seems great and fast shipping FYI )

www.thermoworks.com

Anyway the extension is like 9 or 10 feet and I only need about 4... any issues with leaving the entire extension in or should I cut it down to only what I need? Ive heard different stories about extending probe leads, different resistance, calibration, etc.

Thanks
 
McRat

McRat

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Aug 2, 2006
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You are right to be concerned, but I do not have an answer. Sometimes screwing with thermocouple extensions can alter #'s.

It SOUNDS like you would be OK, but I'd check first with the mfr.
 
SIKDMAX

SIKDMAX

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Ya, I just wasnt sure. I thought about extending original probe, but Ive heard resistance issues, etc and when I pulled the conector apart the wires were solid copper not stranded, and I didnt have any similar sized solid around, so I didnt test anything by extending. I will connect up the extension in full first and see if it seems accurate.

Thanks Pat.
 
McRat

McRat

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Aug 2, 2006
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It's not the resistance, it's the dissimiliar metal thingy.

Dissimiliar metals generate a voltage when heated, which is how the thermocouple works. So extensions can possibly alter that voltage if they aren't right.
 
SIKDMAX

SIKDMAX

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Sep 14, 2007
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OK, that makes sense then and therefore me extending wouldnt work. However I know my probe is a "K" type, and therefore I ordered a "K" type extension, so hopefully things should be good. Probe is on UPS truck for delivery today, we shall see.
 
SIKDMAX

SIKDMAX

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The jelly beans were a nice touch :D

thermoextension.jpg
 
sweetdiesel

sweetdiesel

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Aug 6, 2006
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How long is the cable that came with you gauge 8'.5"?

I actually got a longer cable from Autometer when I ordered my gauges but i dont see where they sell it now?
 
SIKDMAX

SIKDMAX

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Sep 14, 2007
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The length of cable on the probe was only 6 feet. It makes it from my pass. manifold to about the brake booster.

Ive heard about/seen Autometer K extension cable but searched extensively and couldnt find it, so I got it from these guys.

Ill put it in tonight and test but im sure it will be fine... have a couple other wiring issues to clean up as well.
 
sweetdiesel

sweetdiesel

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SIKDMAX said:
The length of cable on the probe was only 6 feet. It makes it from my pass. manifold to about the brake booster.

Ive heard about/seen Autometer K extension cable but searched extensively and couldnt find it, so I got it from these guys.

Ill put it in tonight and test but im sure it will be fine... have a couple other wiring issues to clean up as well.
Click to expand...


FWIW you can get a 8.5' from Autometer

Street Series Probe Kit Product #:
5249
Complete Probe kit includes 1/4" dia. Stainless Closed Tip Probe with 8 1/2 ft. wire plus 1/4" compression - 1/8" NPT connector and Heat Shrink for sealing wiring connections.
 
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