Thermocouple in EGR port

[jac at wave.sheridan.wy.us]

Depending on the response time you can accept of course, the most 
available and handiest thermocouples are the ones intended for recip 
engined aircraft.  They are scheathed with stainless and properly 
insulated.  In the us you can get them from sport aviation suppliers 
for $30 or so at the very worst price.  They come with a fiber glass 
wrap on the leads and will survive in the engine environment.


-------------------------------------
john carroll
 jac at wave.sheridan.wy.us

---------------Original Message---------------
Hi all, 

After having taken the head off an engine i've got lying around, 
i've 
noticed that there is a threaded hole under the exhaust port for 
what my 
brother tells me is for EGR. This would be a great place to put a 
thermocouple for egt sensing. What i would like to know is is there 
some 
way of putting a thermocouple in this port so that i can measure the 

exhaust temperature, and if so, how could i go about fitting this in 
the 
port. 

I've thought about drilling the centre of a bolt out so that i could 
run
the wire through this, and the end poking into the exhaust. The 
issue of
insulation would come into this. The only way that i could think of
insulation between the wires at these temps is by ceramic fillers of 
some
sort. Do such exist? Is there some way of fastening a thermocouple 
into a
threaded hole that someone has come up with already? There being 4 
ports 
for the EGR, it could be possible to measure the temp of each 
cyliner 
individually, and RIGHT AT the port. 

Any comments would be most appreciated. Thanks.

		Bruno.  (b.marzano at student.canberra.edu.au)

	Smile. It makes people wonder what you are thinking about.



----------End of Original Message----------