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@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of Dave Porter
Sent: Friday, October 01, 2010 6:56 PM
To: 'Ray Carbone'; healeys@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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