Amazing pressure
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  1. #1
    Fellow Frogger!
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    Default Amazing pressure

    was reading that the build up of pressure in the oil wedge of say a crank bearing can be over 6000 PSI

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  2. #2
    Fellow Frogger! young 4 old pug's Avatar
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    HDi engine injects at 32000-36000psi....
    Current stash
    too many.

    Passed over stash
    lots.

  3. #3
    Fellow Frogger! young 4 old pug's Avatar
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    A tyre usually holds 32psi...
    Current stash
    too many.

    Passed over stash
    lots.

  4. #4
    1000+ Posts FIVEDOOR's Avatar
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    Quote Originally Posted by young 4 old pug View Post
    A tyre usually holds 32psi...
    and people have been killed when split rims blow apart at the wrong time

  5. #5
    Fellow Frogger! JAJEA's Avatar
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    Sorry to state the obvious but nothing amazing - but basic engineerings logic.

    Reminds in the rallying of a 1968 Mitsubishi Colt with a twin 40mm Webers on a Galant 1600cc motor. Standard Colt 1000 brakes never stopped us from "stopping"! But boy we had to often "keep the foot on the brake" to keep the pads against the disk to stop them from burning away. Area of pads and size of disk play no part in a once off stopping ability.

    Brakes rely on F=m (Greek letter Mu)N. F braking force, mu coefficient of friction and N applied force. Nothing to do with Brembo Brakes (pretty standard high performance vehicle brakes supplier) but boy, heat comes in to the equation so that size and ability to dissipate heat built up comes into play. So the emergence of bigger disks, ventilated disks and bigger calipers.

    So getting back to Renburg's amazement, thank God for Hydraulics/Physics that governs our World.

  6. #6
    Fellow Frogger! Fingers's Avatar
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    Yes, the pressure in a diesel injection system can easily kill you.

  7. #7
    Fellow Frogger! JAJEA's Avatar
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    Without getting too complicated, the relatively low internal tyre pressures (of say) 32 psi relate to / operate over a "very large internal area" of the tyre hence the big "bang" when things go wrong.

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