PWR Radiator question/alternatives.

[Nevyn72]

Incase you were interested, 949 Racing has a slightly cheaper alternative crossflow radiator than the FM version.
It appears to be very similar in design but being new to the market there's basically no feedback on them so far......

http://949racing.com/SuperMiata-Crossfl ... miata.aspx

[sailaholic]

Nevyn what makes you think the temperature your seeing is too low?

My thought is for a thermostat to control temperature it has to flow enough to keep the engine cool at full load (assuming and adequately sized radiator). Given that I would expect engine coolant temperature to be a couple of degrees above crack open temperature at low load. Assuming of course the cooling system had sufficient capacity for high load situations.

Also by my thinking, the thermostat not the radiator should be the critical component on controlling undercooling. Despite how big the radiator is the thermostat should be reducing flow to the point where the water warms to the sufficient temperature.

If the radiator was overly large and causing "excessive" cooling of the water you might get unstable coolant temps as the termo stat opened and shut completely as overly cool water came though.


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[Nevyn72]

Nevyn what makes you think the temperature your seeing is too low?

The additional temp gauge sender I fitted is located on the radiator side of the thermostat and in cooler conditions in 'low-load' situations (such as a trailing throttle on a long downhill run) the indicated temperature can fall well below the thermostat closing temp (88 degrees). I've actually seen an indicated temp of only ~50-60 degrees in these circumstances.
Plus the in cabin heater suddenly becomes a lot less effective!

The flip side is I've never seen a indicated temp above a touch over 100 degrees, even in the hotter weather we've seen lately.