I am coming up on a few more questions. concerning the CHT temperature settings.
on this air-cooled motor my idea was to use a CHT sender that goes under the spark plug. I have purchased a few senders from Falcon Gauge # CP-018,
https://www.falcongauge.com/product_Det ... llclass=11
if the CP-018 will not work, I found a honeywell themistor that will work and is in the temp range for the motor
Honeywell # 120-102EAJ-Q01,
with this thermistor, I would epoxy it to the cylinder head.
https://www.arrow.com/en/products/120-1 ... gLYx_D_BwE
so the main question at the moment ..
last night when I started to enter in the information, into the tunerstudio on the calibrate themistor page. I have a couple of questions on how to insert data for a an item that is not listed, can i enter in data on just the 3 data points, or do i need to create a file? if I do need to create a file could would someone be able to give me some insight on how the format should be? And how would a person find the Bias Resistor Value (OHMS) ?
I found this post from a couple of years ago, that gives some information between using a themocouple and a thermistor, I am thinking that this information has not changed.
Most CHT sensors are thermocouple type, and require a conversion module/controller between them and Speeduino.
So instead, I suggest you just make your own, and much less expensive also.
Using a thermistor instead of a thermocouple, you can connect directly to Speeduino just like a CLT, and in-fact a CLT element (NTC thermistor) from a CLT can work well. An example is below, made from a GM temperature-curve thermistor, and encased in 3M Industrial tape to insulate it and adhere it to the head at the base of a fin, or directly on the outside of the chamber surface if there's room. Any reasonably-ranged thermistor should work, including the cheap 10k types online. Another member (Frank1380) made his with a thermistor inside a heavy copper cable lug, so it can bolt to the head. Do what makes you happy, and will read the head temperature accurately, so you can use the data for various tuning information CHTs can give.
Using a GM-curve as a peel 'n stick CHT:
Frank1380's version of a CHT thermistor setup: