Determine proper radiator cap pressure rating and its effect on coolant boiling point for engine cooling system design.
Input Parameters
Results
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Boiling Point
°F
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Safety Margin
°F
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Atmospheric Pressure
psi
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Total System Pressure
psi
Note: Each PSI of cap pressure raises boiling point ~3°F. Standard caps: 13-18 PSI. Higher pressure caps require stronger hoses and components. Never open a hot pressurized system.
Reference
Base BP: 50/50=226°F, 70/30=235°F, Water=212°F
Pressure Boost ≈ Cap_PSI × 3°F per psi
Altitude Penalty = (14.696 − ATM_psi) × 3°F
Boiling Point = Base + Boost − Alt Penalty
Safety Margin = BP − Max Operating Temp