Hi Magnus,
We had similar although not identical problems with one of our race engines
after a cam failure.
In order to make the next day's racing we replaced a badly worn cam and
lifters and after that the pressure became very erratic.
We solved the problem in the short term by replacing the oil pressure valve
plunger with a ball (an old "A" series trick) and the problem went away.
The problem was, of course, caused by little flakes of cam lobe jamming the
plunger in the bore.
The engine survived the days racing but the bearings and crank were a real
mess when we did strip it.
Michael S
On Wed, May 15, 2013 at 5:13 PM, Magnus Karlsson
<magnuskarlsson@bornet.net>wrote:
> I have a problem with an engine that I just restored completely. The oil
> pressure gets too high when revved over 2500. The pressure reaches all the
> way
> up too 80 psi, which of course is way too much. The strange thing is when
> the
> engine is cold and you rev it, the pressure will not rise above 60 psi.
> Quite
> contrary to the normal behavior. The oil pump is a new Denis Welch unit,
> the
> oil pressure release valve and spring are new, all bearings in the engine
> are
> new, all parts have been machined to the right tolerances. I4ve tried with
> a
> used release valve and spring that is quite softer than the new one.
> Resulting
> in the same high pressure.
>
> This has got me quite puzzled and I ran out of ideas on how to solve this.
> Has
> anyone experienced the same symptoms and did you find a working solution?
> I4m
> desperate for good advise!
>
> TIA,
>
> www.concourshealeys.com
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--
Michael Salter
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