Electric Water Pumps

Electric Water Pump (EWP®)

Background
The Mechanical Water Pump is one of the last mechanical components of the modern engine which has long been considered an inefficient component that was designed as an accessory from the ever first engines. A mechanical belt driven pump installed on your car engines runs at the same speed as the engine regardless of how hot the engine is. Example: when travelling at high speeds down the freeway, the engine require less cooling as ram air is naturally cooling the engine however, the engine speed is high as is the mechanical water pump thus providing excessive cooling whilst draining the engine of power. Then in heavy traffic in high ambient, the engine is idling or slow and so is the belt driven mechanical pump, even though in this condition, extra coolant flow is required to cool the engine.
 
With an EWP and a digital controller, the speed of the pump is managed by the controller, which varies the supply voltage to the pump and so varies the speed of the pump, hunting for a target temperature. When the engine reaches the target temperature the controller locks on, constantly changing the pump speed with traffic and throttle conditions, maintaining the target temperature independent of the engine speed.
 
The important improvement for your vehicle comes from the fact that most of the power the mechanical pump takes from the engine can be reclaimed with the use of an EWP hence the fuel savings. By removing the parasitic power losses of belt-driven water pumps, the EWP may provide up to 10kw of extra power and additional fuel savings. The engine power used by the mechanical pump increases as the cube of its speed – so when the mechanical pump speed doubles from idle speed say; 600rpm to 1200 rpm, the power it takes increases by eight times. Then another eight times going to 2400 rpm, and so on up to maximum engine speed. It is this extra power and torque that is released by deleting the mechanical pump that provides the fuel savings that is estimated to be 3.5% to 10%.
 
Major European Manufacturers have implemented EWP’s as standard issue on a number of their vehicles, we have documents show that and EWP uses 90% less energy than conventional systems, i.e.: the mechanical water pump. Other advantages will include lower emissions by virtue of faster engine warm up, better engine temperature management, eliminating engine heat soak and improved engine life.
 
Weight reduction is a key requirement of any automotive manufacturer seeking fuel savings and our EWP will weight around 900 grams up to 1,151 grams (dependent on EWP Type) compared to a typical mechanical pump at 3 to 4 kg. Not only is our EWP considerably lighter when matched against the mechanical pump but we would also be replacing several outdated components with one environmentally friendly product which once again helps improve performance and fuel consumption. 

Product Range 
Davies, Craig’s range of patented Electric Water Pumps (EWP) and Electric Booster Pumps (EBP) are available in flow rates from 15 L/min (4 gal/min) up to 150 L/min (39.63 gal/min) at 12v & 24volt and in Nylon66 / Alloy housings. Our EWP's are designed for universal fitment to compliment or replace a vehicle’s existing mechanical belt-driven water pump with simple, DIY installation. The lightweight, compact, more powerful design is suitable for all types of vehicles including small, to large plus high-performance and 4WD vehicles. It’s a vital performance product that improves engine cooling management whilst giving more power, torque and increased fuel economy. They can deliver 3% to 5% improved fuel economy, increased power while lowering environmental impact by reducing emissions.
 

PUMP   

EBP15 

EBP25 

EWP80

EWP115

EWP150

Flow Rate (Max)

15 L/min
4 gal/min

25 L/min
6.6 gal/min 

80 L/min
21.13 gal/min 

115 L/min
30.38 gal/min 

150 L/min
39.63 gal/min 

Pump Material Nylon66

Yes

Yes

Yes 

Yes

Yes 

Alloy

No

No

No

Yes

Yes

Voltage 12 Volt

Yes

Yes

Yes 

Yes

Yes

24 Volt

No

No

No

Yes

Yes

Operating Temp

-40 to 120C
-4 to 248F

-40 to 120C
-40 to 248F

-20 to 130C
-4 to 266F

-40 to 130C
-40 to 266F

-40 to 130C
-40 to 266F

Weight    

245 grams
 0.54 lb

995 grams
2.19 lb

900 grams
2.0 lb

923 grams
2.16 lb

1,170 grams
2.6 lb

Fits Hose Size

12.5 to 19mm

19mm

32 to 51mm

38 to 51mm

38 to 51mm

  
 

  
The many benefits of the EWP include:

  • Increased Power and Torque
  • Increased cooling capability
  • Eliminating Heat Soak
  • Better control of engine temperature
  • Flexible options for pump control
  • Options for pump control

1. Used in conjunction with Digital EWP® Controller
The Digital Controller has a micro-processer which will run the EWP® at exactly the right flow rate maintaining the engine temperature you ‘set’.
2. Use in conjunction with Thermal Switch
Combine the EWP® with an adjustable Thermal Switch to add a cooling boost to an overheating mechanical pump cooling system.
3. Continuous Running
Wire the pump to the ignition for maximum cooling - suitable for race vehicles, very hot climates and chronically overheating engines.
 
EWP Kits come with everything you need for DIY installation including easy to understand instructions.
Digital Controller and Thermal switches are sold separately.

EWP VIDEO PRESENTATION
 
CAUSES OF OVERHEATING IN ORDER OF LIKELIHOOD
1.   Fan facing wrong direction.
2.   Fan rotating wrong direction.
3.   Fan wired to coil or alternator (only 8 Volts.)
4.   No condenser fan.
5.   Temperature gauge faulty - disagrees with thermometer in radiator.
6.   Towing a heavy caravan.
7.   Inadequate kit fitted.
8.   Oil cooler obstructing ram air.
9.   Insect screen obstructing ram air.
10. Driving lights obstructing ram air.
11. Number plate obstructing race air.
12. Battery not up to 13 Volts.
13. Insufficient water in radiator.
14. Radiator need5.cleaning.
15. Radiator cap faulty allowing water to boil at 100°C.
16. Thermostat faulty.
17. Electric motor faulty.
18. Fan not in hot corner of radiator.
19. Engine out of tune or idling too fast. 
 
EWP DESIGN IS PATENTED     USA: 6425353     AUS :756456     EU: 1133624     DE: 69935732.2 
 

Electric Booster Pump (EBP)

The EBP is a ‘brushless’ 12 volt, high flow, magnetically driven water pump. The EBP motor has no brushes to ever wear out and the pump is magnetically driven by the motor, which means that no shaft sealing is required. There is only one moving part, the impeller, and it is floating in the coolant. The pump chamber is hermetically sealed for trouble free operation. The EBP’s ease of installation, low current draw, high flow capacity and long life makes it ideal for a range of applications.
 
The many EBP applications include:

  • Booster for car heater and LPG systems
  • Air to Water Intercoolers for Turbo cars
  • Solar pump applications
  • Water cooled motorcycle, Go-Kart engines
  • Turbo Air/Water Intercoolers
  • Household irrigation
  • 4WD Caravan applications

The EBP is sold in two different flow rates
1. EBP15 (15 L/min)
2. EBP25 (25 L/min)
 
Pease visit our buy online section to view the Davies Craig  section to view the Davies Craig Electric Water Pumps range.

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