Re: Double

On Fri, 29 Aug 2008 08:08:26 -0700, "Skitt" <skitt99@xxxxxxxxxxx>
wrote:

Chuck Riggs wrote:
"Skitt" wrote:
John Varela wrote:
Skitt wrote:

It did? Mine dropped as the oil thinned out. It rose upon
deceleration and dropped on acceleration. My early cars were not
in the very best of condition.

You're kidding.

No, I am not. I'm sure someone can explain that phenomenon.

Higher rpm means the oil pump runs faster, which boosts the oil
pressure. The gauge of my '50 Chevy being underdamped, it gave a
pretty good measure of rpm.

You would think so, but several of my cars did not behave that way.
Like I said, they were not in the best of condition. It is true,
however, that once the oil had warmd up, the oil pressure at idle
was barely registering on the gauge.

I believe my Chevy hovered near zero at idle after warm-up, too.
What I was commenting on was the reported inverse relationship
between rpm and pressure after warm-up.

I know. I was describing conditions during acceleration (not steady
high speed) and deceleration (not steady low speed). I have no idea
what caused a rise in indicated oil pressure during deceleration and
had the opposite effect during acceleration for several of my cars.
There had to be a reason, though.

It could have been oil surge, Alec. If the oil pump was located at the
front of the engine, hard acceleration could surge the oil towards the
rear and leave the pump starved for a moment. It's a guess.

Was the oil pressure gauge measuring manifold vacuum, by any chance?
That might explain the rise and fall you've mentioned. I have a vague
memory of a rubber hose to the carburetors, or thereabouts, that may
have connected to the oil pressure gauge, I can't remember.

I can't remember either.

On early Fords, before wiper motors were practical, the wipers worked
off manifold pressure and would slow down during acceleration. Weren't
some early automatic chokes dependent on manifold pressure, too?
Manifold pressure has little to do with oil pressure, AFAIK.

I do remember that the 51 Chevy was so easy to work on, I was able to
do most repairs and adjustments, myself. It was quite unlike the
automobile engines of today, with all their computerized gizmos.

I used to fix my cars myself too, including pulling an engine and rebuilding
it (MGTD).

On engines of that vintage (and before) it was not too difficult if
you had the right tools and some patience. We had plenty of patience,
but a hoist and engine cradle would have made things easier. Getting
engines out of cars, and turning them over on a workbench, took lots
of brute force supplied by friends on a "I'll help you with yours if
you help me with mine" basis. Replacing pistons and their rings,
lapping in small and big ends, and renewing gaskets, were relatively
straightforward provided that nothing was too worn. But skimming a
head had to be done professionally.
--
Robin
(BrE)
Herts, England
.

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