Here is the second response from a dry sump pump supplier...for what it is
worth... This is the second one for which the manufacturer has no clear idea
of how much power it takes to drive their product.
mayf
----- Original Message -----
From: "Steve Leach" <steve@rcdengineering.com>
To: "DrMayf" <drmayf@teknett.com>
Sent: Thursday, January 30, 2003 7:42 AM
Subject: Re: Dry Sump Oil Pump Questions...
> THE PUMP WE MAKE IS FOR DRAG RACING. IT HAS ONLY ONE SCAVENGE SECTION.
Q1
> WE DO NOT HAVE #'S BUT THE HP REQUIREMENT GOES UP WITH THE # OF PUMP
SECTIONS.
> Q2 THE POWER REQUIREMENT IN BYPASS MODE MAY INCREASE IF THE BYPASS
PORTING IS
> NOT LARGE ENOUGH TO FLOW ALL THE OIL. Q3 CRANKCASE VACUUM IS LARGELY A
> FUNCTION OF ENGINE SEALING AT THE PISTON RINGS. A SUPERCHARGED ENGINE
HAS A
> LOT MORE PROBLEM IN THIS AREA. Q4 & Q5 TRY www.daileyengineering.com
THESE
> GUYS ARE REAL ENGINEERS THAT KNOW ABOUT OIL PUMPS. YOU MIGHT ALSO
CONSIDER THE
> WINDAGE LOSSES OF A WET SUMP SYSTEM AT HIGH ENGINE RPM AND THE FACT THAT
THE OIL
> IS FULL OF AIR AND ITS LUBRICATION QUALITY IS SERIOUSLY COMPROMISED.
HAPPY
> DEBATING, STEVE
>
> DrMayf wrote:
>
> > I am one of those few who race on the bonneville Salt Flats. Our email
list
> > is currently debating the issue of dry sump vs wet sump for our
> > applications. Can you provide data or information which shows:
> > 1) the horsepower to drive the dry sump pump with differing numbers of
> > scavenge sections (eg 2, 3, or 4)?
> > 2) When the pump goes into bypass or relief mode, does the power
required to
> > drive he pump stay the same as befoe bypassing oil?
> > 3) Given multiple stages to the scavenge side of the pump, how much
vacuum
> > can or is drawn in the crankcase in inches of HG?
> > 4) How does the power required for the pump compare to a typical wet
sump
> > pump?
> > 5) And finally, do you have a graph of power required vs rpm for a
typical
> > installation?
> >
> > The discussion currently on going is lively, so we need your input
quickly
> > before the flames die down <G>.
> >
> > Many, many thanks,
> >
> > Lawrence E. Mayfield
> > aka drmayf@teknett.com
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/// what is needed. It isn't that difficult, folks.
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