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  #1  
Old 12-24-2018, 10:01 AM
mturnerb mturnerb is online now
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
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Default Dumb question - connecting CHT/EGT probe wires

I have wiring harness from stein with all the wires for the EGT/CHT probes (brown wire). My Garmin engine sensor kit has all the probes which are terminated with staggered ring terminals with small screws.

I need to make connections between the brown wires and these probes - what are the acceptable/common methods for doing this? I've been using butt splices sealed with shrink tube for connecting other miscellaneous wires (in some cases of course devices have their own terminal plugs i.e. PMAG).

Thanks in advance!
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  #2  
Old 12-24-2018, 10:19 AM
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Raymo Raymo is offline
 
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Location: Richmond Hill, GA (KLHW)
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Default

I would suggest sticking with the ring terminals (available from ACS). The hardware should come with some small star washers that help maintain a good connection.

When troubleshooting odd readings, you want the ability to easily swap wires from one probe to another. Keep the back cylinder wires long enough to reach the front probes for this purpose.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
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  #3  
Old 12-24-2018, 11:29 AM
mturnerb mturnerb is online now
 
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Quote:
Originally Posted by Raymo View Post
I would suggest sticking with the ring terminals (available from ACS). The hardware should come with some small star washers that help maintain a good connection.

When troubleshooting odd readings, you want the ability to easily swap wires from one probe to another. Keep the back cylinder wires long enough to reach the front probes for this purpose.
So ring terminals on the brown wires from engine analyzer that match up to ring terminals on the probes? Assuming it's OK to "fold" the wires for service loop as you describe?
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  #4  
Old 12-24-2018, 11:38 AM
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Quote:
Originally Posted by mturnerb View Post
So ring terminals on the brown wires from engine analyzer that match up to ring terminals on the probes? Assuming it's OK to "fold" the wires for service loop as you describe?
Yes and yes.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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  #5  
Old 12-24-2018, 11:58 AM
mturnerb mturnerb is online now
 
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Quote:
Originally Posted by Raymo View Post
Yes and yes.
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  #6  
Old 12-24-2018, 01:45 PM
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2 other methods of joining those wires are in another thread. Do a simple search ?erratic cht? and u will see them suggested, in case the ring terminals give u problems.
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  #7  
Old 12-26-2018, 09:58 AM
SteinAir SteinAir is offline
 
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Location: Minneapolis
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Ring Terminals are fine and used by many (we keep them in stock and obviously sell them too). Some folks also have/and do use spades, butt splices, knife splices and other methods.

It is nice to be able to remove them and swap if need be as previously mentioned, so we prefer "non-permanent" options like the small ring terminals.

Cheers,
Stein
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  #8  
Old 10-27-2020, 12:39 PM
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Quote:
Originally Posted by pilotkms View Post
2 other methods of joining those wires are in another thread. Do a simple search ?erratic cht? and u will see them suggested, in case the ring terminals give u problems.
That search results in 8 pages of posts. Can you suggest anything to narrow that down a bit? Not being a fan of ring terminals, I would love to know the other options.
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  #9  
Old 10-27-2020, 01:54 PM
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Default Dec 2018

Look at my posts (using USER CP in top left corner) starting 12/18/2018. I use Omega connectors. Made specifically for CHT and EGT wiring. Almost 2 years and 300 hours now and rock solid since I converted to them.
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RV 7A RV #9700 May 2017
N325KS the Flying K
Built in SoCal KCCB, now in GA @ KPXE
800+ Hours & 7X cross the USA
OSH flyin 2018 & 2019 & Petit Jean 2019 & 2021
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  #10  
Old 10-27-2020, 02:44 PM
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climberrn climberrn is offline
 
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Quote:
Originally Posted by pilotkms View Post
Look at my posts (using USER CP in top left corner) starting 12/18/2018. I use Omega connectors. Made specifically for CHT and EGT wiring. Almost 2 years and 300 hours now and rock solid since I converted to them.
Switched several of mine over to the Omega connectors. Some are still the Dynon supplied spade connectors. Replacing on an as needed basis. The Omega connectors are much better, reusable when a probe goes bad, and secure. They take a little more time than the crimp connector, but they work well. The CHT and EGT use different connectors according to Omega.
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