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914World.com _ 914World Garage _ CHT Sensor

Posted by: Rikyrat Apr 20 2020, 09:43 AM

Hi All:

Have a question, I am in the midst of final wiring on my megasquirt injection system.
Since it uses it own CHT sensor, I am thinking about using the Stock CHT sensor to monitor temps.

I Currently have a ring sensor on the number 3 cylinder, but was considering removing it. The problem I have is that the ring sensor has 2 wires going to a connector and the stock only has one. I believe that the stock sensor is grounded to the block itself.

Is there any way to adapt the stock sensor to use it. Should I connect one of the pins on the ring sensor connector to ground, or will that totally screw things up.

Thanks for any assistance

Posted by: Mark Henry Apr 20 2020, 11:07 AM

Stick with the spark plug ring, it's the most accurate placement.
You cant use the stock CHT sensor.

Posted by: GregAmy Apr 20 2020, 04:32 PM

'Cause I'm curious and don't want to start another topic...

Mark, your thoughts on the correlation between the CHT under the #3 plug (what we all use as a baseline for discussions) and a temp sensor placed under the sheet metal screw to the head just outside the intake runner near #3 cylinder? See my photo below.

I'm using The Dub Shop's "modified CLT" sensor for warm-up, but I'm not sure how much confidence I have in this value for accuracy. I've used a handheld infrared and compared this terminal to that of the head directly with the plug wire off (engine not running of course) and it's generally within 5%.

I'd love to use this value as a hard cutover to a less-aggressive map on my Microsquirt install, and it would also be useful as inputs for my race car data acq.

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