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Rad Cap

Discussion in 'Tech' started by parillaguy, Dec 8, 2022.

  1. parillaguy

    parillaguy vintage+GP racer

    One of the ways to improve cooling in a liquid cooled bike is to increase the radiator cap pressure. Stock is usually 1.1 bar. I have used 1.3 bar cap on my last race bike (no thermostat) and didn't have any problems. Does anyone have experience going to a higher pressure cap than 1.3?
  2. sheepofblue

    sheepofblue Well-Known Member

    Increasing the cap will increase the boiling point of coolant not improve cooling. Thus your engine can run hotter without boiling over. Not sure this is desirable.
    dave3593, OutOfSpec and fastfreddie like this.
  3. javyday

    javyday Well-Known Member

  4. TurboBlew

    TurboBlew Registers Abusers

    if youre going to increase your cooling system boiling point... make sure the whole system is up to the task.
    OutOfSpec likes this.
  5. Boman Forklift

    Boman Forklift Well-Known Member

  6. RM Racing

    RM Racing Tool user

    If you are blowing water past the cap at an altitude below 1500 feet, there is probably another issue, 2.0 caps are almost essential for tracks like Miller higher than 3K feet above sea level.

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