Author Topic: Thermocouple Wire Length (Read 5686 times)

fatmobile · « **Reply #15 on:** February 22, 2009, 02:22:49 am »

Andrew, do you use any de-ox or silicone dielectric compound on the connections to reduce oxidation and improve the connection?

dubbinchris · « **Reply #16 on:** February 26, 2009, 02:40:37 am »

A thought....is is possible to have one gauge and two probes/thermocouples and the ability to switch between the two with some sort of toggle switch? I have no experience with EGT gauges yet, but was thinking about the ability to switch between pre and post turbo readings.

Clintwalker85 · « **Reply #17 on:** February 26, 2009, 09:22:16 am »

i am using a vdo egt and i find its very slow also....i have the t couple on the downpipe bend...is that good? how much hotter is it running in the manifold? anyone know? also where can i buy a spruce t couple 1/4 npt?
Thanks
Clint

Vincent Waldon · « **Reply #18 on:** February 26, 2009, 09:25:29 am »

The answers to all of your questions are in this thread. :shock: :wink:

Vincent Waldon · « **Reply #19 on:** February 26, 2009, 09:49:29 am »

Quote from: "dubbinchris"

A thought....is is possible to have one gauge and two probes/thermocouples and the ability to switch between the two with some sort of toggle switch?

Here's a thread from the solar energy world with a thermocouple switch about half-way-down:

http://www.builditsolar.com/References/Measurements/thermocouples.htm

Note that it's a special switch with special contacts and special connectors used throughout... all the way to the meter itself.... the idea being that *every* dissimilar junction in the chain introduces error.

T-couple switches are more commonly used in industrial applications... suppliers like Omega carry them... but I'm guessing a dual gauge is likely cheaper for your application... plus you'd actually get to watch the differences between the two sensors in real time.

Vincent Waldon · « **Reply #20 on:** February 26, 2009, 09:51:53 am »

Quote from: "libbybapa"

Vince you should have posted a link to this thread.

I think that might trigger a black hole and swallow the entire universe??!! :lol:

Vincent Waldon · « **Reply #21 on:** February 26, 2009, 09:57:23 am »

OK, we're beating this poor thread to death, but I can't resist... turns out our beloved Aircraft Spruce sells a 4-position t-couple switch for a pretty reasonable price:

http://www.aircraftspruce.com/catalog/inpages/westcombos3.php

Should have thought of that sooner... EGTs are an important part of mixture balance on small aircraft engines and it's not uncommon to have an EGT probe for each cylinder.

Still think the dual gauge is a better answer... since we know the temp difference pre and post turbo are going to be dynamic.

VWSmokr · « **Reply #22 on:** February 26, 2009, 05:33:43 pm »

Vincent Waldon, your avatar may be my favorite of Peter's illustrations from Muir Pub's VW Rabbit manual. I recall initially feeling a bit like that back in 1980, when I first started messing with diesel Rabbits, and was making quite a few red-eye trips between SoCal and Vancouver, BC.

In those days you definitely looked for the truckstops on US I-5, 'cause that's about the only places you were assured of finding diesel fuel, especially during the nighttime hours, when the small local stations were mostly closed from 7pm till 7am. IIRC that's when I added the 11-(U.S.)gallon auxiliary fuel tank and stopped worrying!

A real memory grabber! Thanks.

J.R.
SoCal

Vincent Waldon · « **Reply #23 on:** February 26, 2009, 05:41:08 pm »

Quote from: "VWSmokr"

Vincent Waldon, your avatar may be my favorite of Peter's illustrations from Muir Pub's VW Rabbit manual.

A real memory grabber! Thanks.

I'm with ya man.... had a Rabbit pickup at the time and got lots of strange and curious looks from the truckers. Peter's illustration evokes that mood, immediately.... you're a little out of your element but pleased to be there with the big boys, rattling away, just like them.

Back then diesel was.. what... half the price of gas? :cry: