Temps in the 190's with a 180 thermostat in a D2 is normal. You have a D1 with the thermostat in the engine where it belongs. Our's hang out in the open to make sure the temps are higher than they should be. I have a new radiator, fresh coolant and a 180 degree thermostat and my temps are 187 to 196. What D2 owners need is for someone to make a 170 degree thermostat so the engines run around 180.

 

Took her out on the freeway and held at 188.6 (about 55deg outside today)

Here are some pics of the "sand"

 

I stand corrected. Didn't occur to me that the thermostat location would have such an effect. It does make a lot of sense.

 

I have wondered if D2 owners could get better stat operation if the hose into the top of the thermostat from the "T" was covered with some pipe insulation. As well as the thermostat body.

 

[QUOTE=Michael M. Koch;366737]I stand corrected. Wow, how many times is this???

 

I have done this, doesn't seem to make any difference. Still testing... you got any other ideas I can try. Working on a 170 deg t'stat in stock location.

Rover design is very simular to LS(X) motors, except for two things:

1. The LS design actually works without overheating the block.

2. The LS has the thermostat and bypass inside the waterpump housing.

Comments??