[Healeys] oil pressure relief valve

[WILLIAM B LAWRENCE]

But a pressure pulse will be characterized be the conversion of the static
pressure to a velocity pressure. The orifice retards the passage of the
velocity wave and thus damps the pulse.

Bill Lawrence

> From: sbyers at ec.rr.com
> To: healeys at autox.team.net
> Date: Fri, 1 Oct 2010 22:25:35 -0400
> Subject: Re: [Healeys] oil pressure relief valve
>
> Pascal's Law states that any increase in pressure in a closed system of
> incompressible fluid results in an identical increase in pressure at
>>every
> point<< in the fluid.  Thus, the small hole in the fitting has nothing to
do
> with changing the pressure in the system because the pressure will be the
> same at any given moment from the oil pump to the gauge. It does not
> "dampen" pressure pulses.  Pulses are transmitted equally >>everywhere<<
> simultaneously in the closed system.
>
> If all you need to make the gauge work is oil pressure and not oil flow,
> then by Pascal's Law the pressure will transfer through a small hole just
as
> well as through a large one.  However, a small hole in the fitting would
> limit the amount of oil lost through it should the flexible line/hard
> line/gauge spring a leak because it does present a restriction to flow.
>
>
> Steve Byers
> HBJ8L/36666
> BJ8 Registry
> Havelock, NC  USA
>
>
>
> -----Original Message-----
> From: healeys-bounces at autox.team.net
[mailto:healeys-bounces at autox.team.net]
> On Behalf Of Dave Porter
> Sent: Friday, October 01, 2010 6:56 PM
> To: 'Ray Carbone'; healeys at autox.team.net
> Subject: Re: [Healeys] oil pressure relief valve
>
> It is and was duly pointed out by David Nock earlier.
> Dave..the other
>
> -----Original Message-----
> To contribute to the confusion, I decided to replace my original oil feed
> flex
> tube with a new one I had purchased a while ago from Victoria British.  As
> with most replacements, this unit was far less substantial and I was
tempted
> to reinstall the 47-year old original.  When extracting the original, I
> inadvertently de-installed the adapter fitting attached to the engine and
> noted the very small orifice through which the oil would flow.  Based upon
> this very small passage, I am lead to think that this orifice is the
> mechanism
> that the engineers intended to buffer out the pulsations to secure a steady
> gauge reading.  Should this be the case, air must be bled from the tube
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