engine thermostat...

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Topic: engine thermostat... (Read 411 times) previous topic - next topic

engine thermostat...

December 23, 2020, 11:55:39 am

... how does it work?

I am well acquainted with the usual car type. The bulb reacts to heat, offsets the tension from the spring, and opens the diaphragm.

My M11 thermostat has no diaphragm - it is open! Old one, new one, photos on the web.

How does it control flow?

Matt B

Re: engine thermostat...

Reply #1 – December 23, 2020, 12:40:01 pm

When I changed mine I had the same question. The coolant doesn't go through the center as most thermostats do. The outer rim
moves out to block the coolant. If you put the thermostat in a can with water and heat it up you will see how it works.

Re: engine thermostat...

Reply #2 – December 23, 2020, 01:37:36 pm

So...

The clear flow straight through the thermostat is the bypass, and is limited by the restrictor in the 1 5/8" hose. When the thermostat opens, is allows flow through the SIDE - the pipe that leads to the radiator!

Is that right? I am learning stuff!

Re: engine thermostat...

Reply #3 – December 23, 2020, 03:48:38 pm

Yeah that puzzled me too. Only figured it out after I put it in a pan of water and brought to a boil.

see ya
ken

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