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Old April 14th, 2019, 02:50 PM   #13
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

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MOTY - 2018, MOTM - Nov '17
Quote:
Originally Posted by choneofakind View Post
In theory.

In practice, you still have the same Qdot produced by the engine and the same Qdot removed by the radiator, so overall, you'll get a thermostat that opens earlier, causing slow warm ups, and then you'll reach the same operating temp once everything gets to equilibrium. Once you move to a low enough rated thermostat temp that the rated temp is below the natural equilibrium temp of your engine and radiator, it literally just sits open and does nothing. Thermostats will regulate an operating temp higher by going to a higher temp range, not lower by going to a lower temp range.

Ideally, a cooling system gets your engine evenly up to temp as quickly as possible, then maintains perfect operating temp for all duty cycles. Obviously this isn't possible with old school mechanical parts, but between a bypass, a proper thermostat temp, and carefully sized bypass flow to avoid temp oscillations and shock when the thermostat opens, one can get darn close. Conveniently, the thermobob makes this a solved problem.
Fan thermoswitch is not same thing as thermostat.
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