J Kurt Bonk wrote,
>Fresh rebuild, new oil pump (british Vict, might be bad quality?)
>I dont know why these oil pumps dont product great pressure? has
anyone
>done anything to increase pressure at idle? 20/50 weight seems too
thin
>on a hot day, should I switch to a straight 50? How dose a adjustable
oil
>pressure regulator help? I get up to 80lbs/in, soon after startup but
that
>drops once the oil is hot, Any help??????? modifications, replacements
Here's a couple of thoughts,
I) 80 PSI is great for startup, but what is it when it is really hot at
idle?
30+ PSI would be great , 20+ acceptable, 15 or below pushing it.
2) The pump can be "blue printed", where the cover is removed, and
the rotor and impellor are lapped flat, then the case is machined to
a dimension whereby the impellor/rotot will have .0005 or so clearance
relative to the pump covers mounting plane.
This will not give you more capacity, but will increase the pumps
efficiency and thus give more oil to the galleries.
3) 50 wieght is fine, but it will increase the amount of time that your
engine runs without oil. I also assume you live in a region where
it does not get too cold.
4) the adjustable pressure relief valve will NOT get you better
idle oil pressure, but will give you better oil pressure at higher RPM,
plus it reduces the possibility that the valve will stick.
Mine is build such that the spring will not allow full opening of the
relief valve at any pressure. "Hint" the valves tend to only stick wide
open.
5) What were your engine clearances?
I built a motor a few years ago that fell within acceptable bearing
clearances, but was pretty loose. It runs 20 to 25 at 900 RPM super
hot.
6)The "timing chain lube pipe" has a spring and ball that when missing
or messed up, causes way too much oil to be sent to the timing cover.
Also there is a " precision hole" in the end of the pipe, that may also
be letting too much oil out.
Hope this helps.
Jarrid Gross
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