Re: Anybody test a vacuum cut-out? ’57 Lark

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January 6, 2017 at 1:59 pm #50439
fisherman6
Participant

    US Member

    Simply stated 4 inches of HS is equal to 1.96 psi.

    That is PSIG or Pounds per Square Inch Gauge. The -12.73 psi is PSIA or Pounds per Square Inch Absolute. The ‘Absolute’ value is realtive atmospheric pressure which is roughly 14.7 psi at sea level. The 1.96 – 14.7 gives -12.73 psi relative to atmospheric pressure. Hope that helps.

    -Ben

    OldJohnnyRude on YouTube