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EGT probe location on JX manifold

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akw View Drop Down
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    Posted: 12 Apr 18 at 23:55
While I have it out I'm going to tap a hole and put a EGT thermocouple in there.  What's the best location for it?  Does this look reasonable:

jx manifold
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akw View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote akw Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 18 at 00:01
I'm not a big fan of gauges.  So the plan is to hook it up to an Arduino microcontroller, using this:


and drive a little OLED display like this one:


If that goes well, I'll add some more stuff to it. 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote clift_d Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 18 at 09:56
Originally posted by akw akw wrote:

While I have it out I'm going to tap a hole and put a EGT thermocouple in there.  What's the best location for it?  Does this look reasonable:

jx manifold


New replacement manifolds from Brickwerks look to have a thicker section in that area, presumably to allow a threaded hole to be formed to take an EGT thermocouple.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote akw Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 18 at 11:57
That's a good point.  There may not be enough meat on there for a decent thread.  Sounds like this needs welding, but given my time constrains I may have to give it a pass in this case.  Thought it's just a simple tap a hole jobbie.


Edited by akw - 17 Apr 18 at 11:57
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Post Options Post Options   Thanks (0) Thanks(0)   Quote clift_d Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 18 at 12:59
I'd also be interested to know about the thickness of the manifold as an EGT gauge is on the to-do list for our van.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote dave friday Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 18 at 23:25
I drilled and tapped in that position ,works ok.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote akw Quote  Post ReplyReply Direct Link To This Post Posted: 18 Apr 18 at 00:45
In the end I had a go at it earlier and it's fine :-)

Enough meat there for 5 threads:



And the finished item:


I started with a small drill and worked my way up to 8.7. Then taped with 1/8-27 NTP tap.  I'm using a standard k-type thermocouple from ebay.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote dave friday Quote  Post ReplyReply Direct Link To This Post Posted: 18 Apr 18 at 08:04
Yes that's what I did,the first thermocouple failed after 6 months! The readings are a bit alarming (800 deg c ) up hill top gear foot to the floor!
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