Determine proper thermostat rating and flow characteristics for engine operating temperature management.
Input Parameters
Results
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Thermostat Rating
°F
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Full Open Temp
°F
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Est. Heat Load
BTU/hr
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Bypass Flow (closed)
GPM
Note: Modern engines use 195-210°F thermostats for emissions efficiency. Racing engines often use 160-180°F for detonation margin. Jiggle pin/bleed valve prevents air pockets.
Reference
Heat Load ≈ HP × 2545 × 0.33 (BTU/hr)
33% of fuel energy goes to cooling system
Thermostat opens at rated temp
Full open = Rated + 15°F
Bypass flow (closed) ≈ 15% of total flow