[DeTomaso] Remote oil filter setup

[forestg at att.net]

 Correct, it is a gerotor pump (positive displacement). In any system the only way to increase volume of flow without reducing the restriction to flow is to increase pressure by increasing volume. A high pressure pump will not develope any higher pressure than a standard pump if the bearing clearances are such that the system pressure does not reach the relief point of the bypass.
 -------------- Original message from "Tomas Gunnarsson" <guson at home.se>: --------------


> The Cleveland oil pump is not a centrifugal pump.
> 
> Tomas
> 
> ----- Original Message ----- 
> From: "Steve Hawkins" 
> To: "'De Tomaso List'" 
> 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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