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My Black Bitza

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bfit:
Scott
Water temp control theoretically should be based on water temp flowing in to the radiator
If you want to maintain 82 deg C   for instance
If the radiator had a differential across the core of 12 deg C   water would be returning to the engine at 70 deg C   theoretically
Most engine set up in moderate climate conditions  should run in ambient temperatures to 42 / 45 deg c if designed correctly
Now a larger capacity 4 to 5 core double pass radiator  with the same frontal area as original radiator core could have a differential across the radiator of 25 / 35 deg c
 So what I am getting to is,   the control point for the fans should be as close to the regulator housing as possible.
As the regulator   controls the mix or water out of the engine  to the radiator   with the in supply to maintain temp. Using the by pass system which most  believe is only there to help in quick warm up on the engine  at start up.

YOU will notice a lot of modern vehicle fans run on when the engine is turned off.
This can help prevent with flash boiling
As the water will still tend to flow due to convection.

You also can up the radiator pressure this will also help with flash boiling
 The boiling point will increase under pressure  

You can get a good air flow meter at dick smiths. There  not  to dear  and you can measure the  air flow across your radiator core to abstain  exactly what is happening.
I n my field ( Diesel )  you would normally expect 10  to 13 cu meters / min

 Is this helpful or confusing
Bfit

Scott:
Not confusing at all.
My inlet manifold has some plugs right near the thermostat housing. I was intending to use one of these for the temp switch. Tridon Thermo fan Switches

bfit:
Scott
Mite I suggest a manual over ride switch.
 If things start to get hot  or  the ambient temp is a little high you can turn them on .
Bfit  

Scott:
I had already planned to do that. Little safe guards like that come in handy, plus it's a pretty simple thing to do.

sirfixalot:
I have the same fans & built my own control I used a sender out of a magna.I also have a secondary sender with an audible alarm which is about 5 degrees higher than fan sender if for any reason fans fail ie sieze, jam, blow fuse, audible piezio alarm comes on I can drive for about a 1k before engine gets up to near boiling, saves having to watch temp guage all the time.

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