Does your water temp move at all on track?

[magnust]

Originally Posted by alexk

...
I am reminding that I had an overheating problem at the track.

...

I changed the viscus fan sometime ago as mine was dead.
This solved the overheating problem but clearly the thermostat was faulty too.

VERY interested on how it was behaving at the track before and after changing the fan "thingy"! A bit surprised the fan would be involved in cooling the engine at speed on the track.

[alexk]

Originally Posted by magnust

VERY interested on how it was behaving at the track before and after changing the fan "thingy"! A bit surprised the fan would be involved in cooling the engine at speed on the track.

It is a very tight track where you do 5 corners doing 60-65 (2nd gear).

[magnust]

Originally Posted by alexk

It is a very tight track where you do 5 corners doing 60-65 (2nd gear).

Ah! Thx!

[shane@mbtech]

Originally Posted by alexk

It is a very tight track where you do 5 corners doing 60-65 (2nd gear).

The Viscous pulls air through the rad from outside the car. When you are travelling at say 15mph, the air pushing through the rad is far greater than your viscous can pull it through.

Viscous only works when stationary or crawling in traffic.

[alexk]

Originally Posted by lawsy

The Viscous pulls air through the rad from outside the car. When you are travelling at say 15mph, the air pushing through the rad is far greater than your viscous can pull it through.

Viscous only works when stationary or crawling in traffic.

You theory is correct mate.
However, I have seen many times in Greece (with temps above 40C) BMWs having overheating issues when driving up a hill/mountain on 2nd or 3rd gear (40-80km/h) which were caused only by the faulty viscus fan.

You will notice the sound of the fan on a very hot day when accelerating on 2nd gear for example.

[shane@mbtech]

Originally Posted by alexk

You theory is correct mate.
However, I have seen many times in Greece (with temps above 40C) BMWs having overheating issues when driving up a hill/mountain on 2nd or 3rd gear (40-80km/h) which were caused only by the faulty viscus fan.

You will notice the sound of the fan on a very hot day when accelerating on 2nd gear for example.

Yes, but it does not mean its doing anything. It just means the temp in the block is enough to kick off the viscous.

How can a viscous fan, which is only pulling outside air (40*c) through the rad exceed the effect of the air rushing through at 50mph? And stop it overheating?