High Pressure Radiator Cap 1.6 KG. Spears Racing

$34.99 $29.99

Raises the boiling point by 25 degrees when going from a stock 1.1 kg/cm2 (15.7  psi) radiator cap to the 1.6 kg/cm2 (22.75 psi) radiator cap.The radiator cap allows pressure to build up in the cooling system and will eventually vent that pressure to the overflow bottle as the need arises. The cap does this by a spring loaded valve which serves as a pressure relief valve at a rated pressure.

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Spears Racing High Pressure 1.6 Radiator caps This is the simplest and the most inexpensive way to avoid boiling your engine, especially important on over-stressed Lightweight Race bikes cooling systems, is to Pitch the stock 1.1 kg/cm2 radiator cap for a Spears Racing 1.6 Radiator caps. While raising your cooling system’s maximum operating pressure does raise your cooling system’s boiling point and therefore helps to avoid boil-over, it does not lower the engine’s operating temperature prior to boil-over. It simply allows your engine to continue to operate at temperatures higher than it is engineered for.
Water boils at 212 degrees, and for each pound you raise the system pressure, it raises the boiling point 3 degrees. A 1.1 kg/cm2 cap converts to 15.9 psi. Most race bikes use 1.6 kg/cm2 caps (which is 22.75) and should  fit on most Japanese radiator.

Just remember if you have a big bore kit installed on your engine with a higher then stock compression ratio which usually has a higher combustion chamber temperature, then it’s a good idea not to overlook this and to tune the cooling capacity of your engine at the same time you are tuning the performance of your engine.

If you don’t balance this out, then it’s possible to run in to an overheating engine with a risk on damage and coolant boiling over everywhere which is not only uncomfortable while you are traveling, it would stop your journey right there.

The radiator cap allows pressure to build up in the cooling system and will eventually vent that pressure to the overflow bottle as the need arises. The cap does this by a spring loaded valve which serves as a pressure relief valve at a rated pressure.

You’ll notice that there’s a plunger on the bottom of the cap. As pressure builds, it pushes up on that valve until eventually the valve is opened far enough for coolant to flow out of the tube connected at the radiator fill neck. It closes again when the pressure has dropped to the desired level

In other words, of all common liquids, water requires the most heat energy to change its temperature.

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