[DeTomaso] Remote oil filter setup

[Tomas Gunnarsson]

The Cleveland oil pump is not a centrifugal pump.

Tomas

----- Original Message ----- 
From: "Steve Hawkins" <shawkins777 at comcast.net>
To: "'De Tomaso List'" <detomaso at realbig.com>
Sent: Wednesday, May 06, 2009 3:28 AM
Subject: Re: [DeTomaso] Remote oil filter setup


> Generally increasing flow requires more volume and requires a larger pump,
> increasing pressure requires multiple stages on a pump.  Centrifugal pumps
> are usually low pressure high flow pumps which is the basic design of the
> Cleveland oil pump.  
> 
> In a system that has a constant internal capacity that doesn't change one
> has to raise pressure to raise flow.  This can be accomplished by raising
> the relief pressure or by using a higher flow pump which will raise
> pressure.
> 
> Steve
> 
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of Julian Kift
> Sent: Tuesday, May 05, 2009 7:52 PM
> To: asajay at asajay.com; De Tomaso List
> Subject: Re: [DeTomaso] Remote oil filter setup
> 
> 
> 
> If the passages are the same size, and you try to move -more- oil through
> them at any given moment (higher volume), doesn't that by definition have to
> increase the pressure?
> 
> 
> 
>>> Not necessarily, pressure is resistance to flow, so in an open pipe 
>>> (with no head increase) there is no increase in pressure.
> 
> Put simply, in a reverse kind of way.... If I increase the pressure on my
> water pressure tank (supplying the house), I can fill a bucket with water a
> lot faster (higher volume).
> 
> 
> 
>>>Yes, beacuse there is no resistance to flow; P1V1 (the tank) = P2V2 
>>>(the hose) so you increase P1 at the tank and as there is no pressure 
>>>change at the hose V2 increases.
> 
> So what is the relationship of higher volume and higher pressure and at what
> point do you get diminishing returns?
> 
> 
> 
>>> Depends what and how far you are pumping and line losses etc. In an 
>>> engine too much pressure is as much a bad thing as too little. A hot 
>>> engine should idle at around 20 psi and I've heard rule of thumb is 
>>> 10 psi for every 100 HP at WOT.
> 
> 
> To me, a "high volume" oil pump -implies- higher pressure, and... a "high
> pressure" oil pump -implies- higher volume.
> 
> 
>>>On an oil pump there is an internal relief spring, dictating at what 
>>>pressure the pump internally bypasses i.e. the max pressure it pumps. 
>>>The high volume pump will internally bypass at a lower pressure (than 
>>>a high pressure pump). The pressure it produces in the engine depends 
>>>on resistance to flow i.e. leakage around bearings, frictional losses, 
>>>clearances etc.
> 
> 
> 
>>>A high pressure oil pump will require greater resistance to flow 
>>>before it internally bypasses and is designed for applications where 
>>>there is a lot of leakage (pressure loss) i.e. a worn engine or one 
>>>designed with slide rule tolerances.
> 
> Julian
> 
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