QUOTE(boxsterfan @ Jun 5 2015, 08:55 PM)
My 2.0L has a sticker in the engine bay saying 186 F is the proper operating temp.
Pic please? I wonder who made the sticker...
QUOTE(Hank914 @ Jun 5 2015, 09:22 PM)
So how does oil temp relate to cylinder head temp?
They don't really relate. Oil temps are affected strongly by RPMs and air flow into/through the engine bay. Head temps are strongly affected by mixture and load. Depending on the gauge, head temps of 350F are normal, 425F would be in the too hot range.
The stock sender for head temps is only useful for the fuel injection. It's in a part of the head that reacts more slowly to temp changes than the critical areas, so it isn't a great location for a gauge sender. It also works on a different principle than the ring-type sender that goes under the spark plug, producing a completely different signal.
--DD