S54 thermostat tests

[alexk]

So back on 04.03.2012 I did some thermostat tests which you can see here

To make things easier, I am doing a copy/paste of this post here
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Today I found the time to remove my thermostat and do a comparison to the new one.
I am reminding that I had an overheating problem at the track.
I was also experiencing a drop in water temp after a fast run (i.e. highway with 200km/h and then backing off, the water temp would drop... and then after a while will go back to the middle).

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

I ran a few tests using the traditional method of a an old pot and hot water.

1st test, put boiling water inside.
The new thermostat is on the right on all pics.
It opened faster but also opened wider.
You can see there is a difference of 2mm.


Then I quickly pulled them out for a pic.
Again the difference is massive.


I let them cool down and then did a 2nd test.
The result was similar.


3rd test
I started putting cold water inside.
The old thermostat didn't close fast enough (that explains my water temp dropping when backing off).


I am confident my temp issues will be totally resolved with the new thermostat.
My recommendation is if someone has overheating issues to change the viscus fan and thermostat.

Last but not least, a picture of my helper 'Pipis'.