20 psi Racing Radiator Cap by Stant MotoRad Racing Division (18-22 psi)

Stant MotoRad Racing Division radiator cap:

• 18-22 psi. (124-152 kPa)
• Octagon 8-sided shaped cap for excellent grip.
• Standard size caps fit 2-1/8″ O.D. x 3/4″ deep neck, also known as standard SAE size “A”
• Stainless steel cap and spring.
• This is a “recovery system cap” that allows coolant to exit the cooling system into an overflow or recovery bottle as coolant heats and expands. As the system cools, recovery system caps will draw coolant back in to keep the cooling system full. Non-recovery system caps allow coolant to exit the system, but do not draw coolant back into the system.
• Higher cooling system pressure raises the boiling point of coolant to reduce the risk of overheating. Water boils at 212°F/ 100°C at sea level. Each pound of pressure in the cooling system raises the boiling point by 3°F. Example, a 20 psi radiator cap will allow for 60°F (3° x 20 psi) of additional temperature before the coolant (water) will boil in the cooling system; new boiling point of 272°F. Higher coolant pressure generally improves performance, not by making the engine run hotter, but by raising the coolant’s boiling point, preventing steam pockets, and allowing more effective heat absorption and dissipation, leading to cooler, more stable engine operation and better lubrication.
• MotoRad part number T208
• Universal fit, will work on racing and street cars alike requiring this pressure rating.