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Message
Rusty, my
cooling capacity model indicates that the stock Mazda cooler does not adequately
cool at speeds below approx 120 MPH with high power setting (like 150-160HP or
above) .
Good thing I don't have a
stock FC cooler :-) I have a Setrab, with a core about 9.5" x 15" x
2".
Since the oil
specific heat is only about 1/2 that of water, it requires approx twice the flow
rate (based on that difference along) of coolant to bring the same amount of
heat to the cooler. Then if the airflow through the oil cooler is
impeded in any way (or you are pumping hot air into it) the situation becomes
worst.
There's not really much we
can do about oil flow rate, short of not restricting it. Does the oil
typically flow at double the rate of the coolant in the stock
configuration? I've never really thought about that, but I can't see how
it could.
If the oil doesn't flow that much faster
than water, and it has half the heat rejection of water, then do we need to size
the oil cooler the same as the radiator? I've been amazed at how little
radiator I need, compared to how hard it is to cool the oil, so this is starting
to make sense.
I'm still interested to know
how much heat the air picks up when passing through a radiator. I realize
that this can vary quite a bit, but I just don't have a feel for how hot
the air gets. If it's 80 outside, does the air exit the back of the rad at
90, or 190, or? Someone should really make an instrument with spare
temp sensors that we can use to measure these things
:-)
Cheers,
Rusty (EWP's were in LA
yesterday)
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