Jim, It may - my opinion.....
The system pressure, as read by the guage, depends basically on three things.
1. the condition of the bearings etc/ie resistance to oil flow. 2. the
quality of the 'seal' of the bypass valve ie the exact shape of the bullet
nose and the matching shape of the block machining at the point of seating.
and 3. the strength of the relief spring ie its ability to resist the
pressure being offered by the pump - and only retract when pressure reaches
60psi. Below 60psi, oil may not escape via the relief valve and is all
therefore directed to the bearings et al for final escape back to the sump.
If the bullet seating is almost perfect the guage pressure will be deterimed
by the lesser of the bearing condition resistance or the relief spring
resistance. Both bad bearings or a weak spring will produce a 'effective oil
system pressure leak' downstream from the pump, and result is a lower net
pressure at the guage.
Robert N. Blair Yellow 65BJ8 RNBmail@yahoo.com
--- On Fri, 10/1/10, jim brown <jbrown5093@yahoo.com> wrote:
> From: jim brown <jbrown5093@yahoo.com>
> Subject: [Healeys] pressure relief valve
> To: healeys@autox.team.net
> Date: Friday, October 1, 2010, 6:15 AM
> I seem to remember that there are 2
> different oil pressure relief valves
> available. They are different in their profile on the
> bullet end of the piston
> with one having a shoulder and not being a smooth taper.
> Fitting the wrong one
> will change the pressure at which oil is by passed. Is that
> correct?
>
> Jim Brown
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