Hi DaveQ:
"Was there ever a time when you didn’t know everything"
A:
Yes quite often, but i then go and find the answer and remember it.
Q:
I for one don’t see Ryan’s question as stupid
A:
The overall question is not stupid just the the way it was asked.
To be honest the opening lines of my post, I was just having a bit of a laugh but again its been taken way to personal and seriously.
Anyway back the the question of is 170 degrees to hot.
The CHT sensors that ford use are dual mode sensors.
During normal engine operating conditions, the system records engine coolant temperature. During a loss of coolant, the system records cylinder head temperature.
ECT mode works upto about 110 degrees and after this the CHT modes kicks in.
Both modes work with negative temp coefficient principle.
E.g when cold high volts eg 4.2v then reduces as the engine warms up , 0.5 volts around 90 degrees ECT.
after 110 ECT the PCM strategies change and it uses CHT the volts change to around 3.0 volts and drop as the engine gets hotter and hotter.
140 degrees lets say 1.9 volts.
I little like vauxhall Multec systems which switch there voltage range around 50 degrees coolant temp.
So if the coolant system is functioning correctly the core temp of the cylinder head should normally equal the coolant temp.(latant heat princpiles)
Use you infra red thermometer and compare the two.
so 170 degrees engine temp is way to hot and I don;t care were or how you measure it.
the engine is two lumps of metal full of water.
Also I thought I answered his question quite well and gave him a couple of good pointers.
I suspose I should just learn to read these post's and say nothing like 90% of the other members.
Cheers
Darren..........