Why I installed a low temp thermostat. - Page 4 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

pothole · 11-10-2013, 02:49 PM

Perhaps. But I'm not convinced. I have no idea where you get the idea that these engines run at 99 degrees steady state for instance.

The BMW comparison was not meant to be definitive and is no more or less relevant than your mention of the Mezger engine in GT2/3 and Turbo.

But apparently it's OK for you to draw comparison with completely different engines, just not for me!

pothole · 11-10-2013, 02:52 PM

The single argument I have heard in favour of the low temp stat that makes some sense is one you have not mentioned at all.

It relates to speed of reaction and the fact that the stat is place at the inlet side on the engine. IE the stat sits on the engine where the coolant from the rads comes in, rather than where the coolant from the engine leaves for the rads.

In this scenario, you can imagine how it would take quite a time for hot coolant to make it's way round.

I am not sure if this is true (the stat placement), but if it is, it does rather argue for a lower temp and faster opening stat.

JFP in PA · 11-10-2013, 03:06 PM

If you have access to the Bentley manual for the car, I believe there is a simplified flow diagram in it that shows the stat on the return from the radiators to the engine.

I tend to focus more on why these engines are so hard on oil, and what can be done to reduce that, as well as limiting as much as possible the thermally induced stresses put on the alloy components by a system with known hot spots and flawed coolant flow problems. Lowering the coolant temp appears to help both, as does adding the larger "S" oil cooler to base engine cars.

MikeDelta · 11-11-2015, 01:05 PM

Has someone installed with the lower temp thermostat a manual switch for manually switching on the radiator fans

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MikeDelta · 11-11-2015, 01:08 PM

Has someone installed together with the lower temp. thermostat also a switch for manually switching on the radiator fans?

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mikesz · 11-12-2015, 03:11 AM

I am pretty sure I saw a post on one of the forums someone did it but it wasn't something I wanted to do so didn't follow it.