m30b35 E30...

[Minstrel]

my M30 conversion I'm running a E28 535I rad and a large push fan...
if I put a thermastat in my car it runs too hot! and temp keeps on slowly rising!
any ideas? thanks.

[mcbonio]

Sounds like the thermostat isn't opening when its at temperature. Do you know if the thermostat works correctly?

[Alburglar]

...put it in a glass jug and pour in boiling water from the kettle, to see if it opens.

[Minstrel]

the stat is new and opens fine but just runs too hot now

[Rav335uk]

You need an 80 degrees stat for the m30.

[pacerpete]

You need an 80 degrees stat for the m30.

A few small holes drilled in the outer circumference of the thermostat is a worthwhile mod.

Running these engines without a thermostat WILL cause damage. The thermostat acts as a restriction in the coolant flow, with it removed the coolant finds the easiest , IE shortest, path around the engine and this results in the rear of the engine running a lot hotter than the front

[staley_turbo]

You need an 80 degrees stat for the m30.

A few small holes drilled in the outer circumference of the thermostat is a worthwhile mod.

Running these engines without a thermostat WILL cause damage. The thermostat acts as a restriction in the coolant flow, with it removed the coolant finds the easiest , IE shortest, path around the engine and this results in the rear of the engine running a lot hotter than the front

Well I didnt know that, Time to put mine back in.

[Andyboy]

Just one hole is needed. About 2mm diameter and at the top. It just helps bleeding air out.

A lot of owners of K Series donks do this - it prevents a thermal shock when the stat opens and dumps cold water into a hot head. Apparently.