Why not remove the thermostat in a turbo engine?

[sapper]

I can't think of a good reason to keep a thermostat in a turbo charged engine.
The engine gets hot pretty quickly and the coolant has to cool the turbo as well so why not have less restriction to the coolant flow?
I'm sure there is good reason to keep it but I can't think of it, some one educate me please.

[phillpot]

sapper said:

the coolant has to cool the turbo as well

Not very au fait with modern turbo engines but on the old diesels I worked on there was no coolant flow to the turbo?



Maybe true or not but many years ago I was advised (by someone who's opinion I respected) that a cooling system needed some restriction (coolant can flow too fast and not have time to absorb heat?) so a restrictor plate should be fitted if the thermostat is removed?

[sapper]

phillpot said:

Not very au fait with modern turbo engines but on the old diesels I worked on there was no coolant flow to the turbo?



Maybe true or not but many years ago I was advised (by someone who's opinion I respected) that a cooling system needed some restriction (coolant can flow too fast and not have time to absorb heat?) so a restrictor plate should be fitted if the thermostat is removed?

Thanks for the reply, Philpot, my turbo is water cooled and its a big lump. The cooling system has been adapted to cool the turbo. So my thinking is there is the restrictor, and its a big hot restrictor.
I'm going to give it a try without the thermostat. I can always replace it. Unless there is a good reason not to.

[Pupp]

What exactly are you trying to address; is the coolant getting over-hot?

[sapper]

Pupp said:

What exactly are you trying to address; is the coolant getting over-hot?

Not trying to address anything, just that with the turbo its hotter quicker so thinking to cool quicker.

[Pupp]

I doubt the turbo is making that much difference from cold; you'll be letting the oil come up to temp before boosting I imagine and the oil takes longer than the coolant to come up anyway. On mine, with a digital SPA gauge, you can clearly see the coolant temperature cycling around the opening and closing of the 74 degree thermostat I use... and that's a small aperture one as I run a straight out Eales housing outlet. I'd keep it

[sapper]

That's 2 against 1, the I's have it. Thermostat stays.

[Sardonicus]

sapper said:

That's 2 against 1, the I's have it. Thermostat stays.

Without going into detail you made the right choice.

[ChimpOnGas]

In addition to the well known function of the thermostat it also acts as a venturi speeding up water flow at the point in the system where its fitted.

The coolant system is designed to operate correctly with this venturi effect in place, delete the thermostat and there's no venturi effect.

Secondly a mechanical water pump is only really a paddle to assist the natural flow & circulation of coolant generated by thermosyphon, it is certainly not a proper positive displacemt pump. The choke caused by the thermostat gives something for the pump to push against.

So for all these reasons & the obvious rapid warm up function of the thermostat means you're I'll advised to delete it, turbo or non turbo you definitely need a thermostat.