Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) ARP4 issues

It does seem low doesn't it. The "normal" running temperature of the Duratec is, I believe, 92°. Once hot mine is always between 90° and 100°. I think that the fan goes to the faster speed at about 95° and clicks off when the temperature drops below 92° but this is just from memory, I would have to check that.

If the instrument lights that you have are LED they can not be dimmed with a simple rheostat. LED lights are dimmed by turning them on and off at a high frequency, by changing the frequency you can make them brighter or dimmer. The speed is such that the eye doesn't see the fact that the lights are, in reality, flickering but a video camera may show the flickering because of an interference in the frame rate and the LED rate.

To accomplish this trick you would need a special control box. Cars with dimmable LEDs would have such a control in one of the lighting control units.

PS. If they are not LED dash lights it could be the same as our car. In that case the dimmer is a small knob under the dash near the steering wheel.

same here, except that in traffic, temperature goes to 93C

It seems to be nominal:

cf page 27 of Cosworth information handbook:

http://www.atss.planet.ee/kolaladu/ford/Sierra-escort/cosworth_yd_information_handbook_1_0_(web).pdf

"Thermostat is a conventional manual device with a 82°deg set point. It is entirely normal for the thermostat to open at lower
temperatures whilst at high engine speed in order to maintain sufficient coolant flow through the engine."

An other remark, all the power charts have been done with a 70°C coolant inlet temperature.

70°C could be a little bit on the cooler side of regular for normal road use. I guess Cosworth will insure that the engine never goes too hot during a track day event.

Surely, Cosworth and Ford (the makers of the base engine) each have different prime goals? Fords will be economy, emissions, low engine wear and the ability to operate any where in the world. Cosworth's only goal is performance. These different goals require different operation conditions of things like water temperature.

Cheers
John

Peter, there could be a difference between coolant inlet temperature and the point where the coolant sensor is mounted at your engine, there placed probably reading higher temperatures.

Gents, you are all assuming the factory gauges are accurate.....

Simon @ SiFab.co.uk

my are surely not, Gauge reads 5C more than my OBD...and that will not warranty that the coolant sensor is also ok (which is in case of my 4/4 the same sensor for OBD and Gauge).

there is a digital readout of water temperature in the display area of the speedometer, accessible by pressing the black button ..

the digital readout pretty much mirrors the analogue dial

I have 2 temperature sensor, one in the head which feeds the ECU, and one in the coolant pipe as it exits the thermostat, which feeds the dash gauge.

The dash gauge varies quite a lot, but usually shows around 90C in normal driving conditions. The ECU reports a rock steady 100C under more or less all conditions.

I would imagine that the digital temperature readout on the ARP4 could be similar, reporting the temperature in the head, whereas the gauge shows the coolant temperature as it circulates.