[Spridgets] Oil Pressure vs Quantity

[Kirk Hargreaves]

It was the water hose illustration that allowed me to understand the
principle.
And I have built a few engines (small blocks) over the years.  I should
have been able to understand this.

Thanks again,

Kirk


On Wed, Aug 13, 2014 at 3:37 PM, Kirk Hargreaves <khargreaves2 at gmail.com>
wrote:

> Thanks all . .  that did it . . got it through my thick skull (for the
> first time).
>
> Thanks so much for the education . . much appreciated.
>
> Kirk
> 59 1275 keeping oil pressure after ten years on an engine rebuild, daily
> driving.
>
>
> On Wed, Aug 13, 2014 at 3:17 PM, Bud Osbourne <abcoz at hky.com> wrote:
>
>> Decreased discharge volume, due to excessive "lift", is not usually much
>> of
>> a problem with a positive displacement pump (which a gear pump is).
>> However, with a little bit of wear, it can become an issue.  Centrifugal
>> pumps, on the other hand (an example would be our car's water pumps),
>> loose
>> volume fast, when the lift distance is increased beyond a certain point.
>> Bud
>>
>> -----Original Message-----
>> From: Spridgets [mailto:spridgets-bounces at autox.team.net] On Behalf Of
>> Michael MacLean
>> Sent: Wednesday, August 13, 2014 3:39 PM
>> To: Spridget list
>> Subject: Re: [Spridgets] Oil Pressure vs Quantity
>>
>> Bud's reply makes sense and maybe if I had replaced the pump this
>> "symptom"
>> would have gone away.  The pressure was rock steady through any kind of
>> driving, so I think the pickup was in the right spot.  At the time I knew
>> nothing of cars.  I just used the low pressure as an indicator and never
>> had
>> to remove the dipstick.  It ran fine until I lent it to a friend that
>> wanted
>> to visit his girlfriend in the Marines in Twenty Nine Palms.  He had to
>> drive from Hermosa Beach and I told him to just watch the oil pressure
>> gauge
>> and stop when the pressure got down to forty.  I even supplied the oil.  I
>> guess he was only thinking of one thing while driving out there.  He got
>> as
>> far as Needles, California and the engine seized.  He had to buy me a used
>> engine from the junk yard to replace the one he killed.  Yes, there were
>> Bugeyes in junkyards back then.  After that I had to use the dipstick like
>> everyone else.Mike
>> ------------------------
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>>
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