Thermatic Electric Fans
Thermatic Electric Fans are an excellent solution for vehicles requiring additional or improved air flow. Thermatic Electric Fans can replace or compliment your existing belt driven or electric fan or be used in air conditioning applications. Additional air flow increases the operating efficiencies on applications for most vehicles.
The Davies Craig Fan range includes:
- 8 inch (12 & 24 volt) Kit & Short
- 9 inch (12 & 24 volt) Kit & Short
- 10 inch (12 & 24 volt) Kit & Short
- 10 inch Slim Line (12 & 24 volt) Kit & Short
- 12 inch (12 & 24 volt) Kit & Short
- 14 inch Slimeline (12 & 24 volt) Kit & Short
- 14 inch Hi-Flow (DC 31) (12 & 24 volt) Kit & Short
- 14 inch Hi-Performance (12 & 24 volt) Kit & Short
- 16 inch (12 & 24 volt) Kit & Short
- Chrome 10", 12", 14", 16" (12 volt) - Kit & Short
- Chrome (Black Blade) 10", 12", 14", 16" (12 volt) - Short
* FAN KITS Include: Fan Assembly, Wiring Loom, Relay, Mounting Hardware, Instruction Sheet
* FAN SHORTS Include: Fan Assembly (motor, fan blade, shroud)
* INSTRUCTION SHEET
Customised Chrome Fans
A Davies, Craig Customised Chrome Thermatic® Fan Kit is ideal for the open engine compartment street rods, show cars, custom cars and high performance vehicles. Limited Edition chrome fan kits have been produced for the enthusiast to save you all the necessary time and effort when choosing that bright, stylized, effective fan for your vehicle.
- All Customised Chrome Thermatic® Fan Kits are suitable for both condenser and radiator cooling.
- The Customised Chrome Thermatic® Fans provide; constant powerful air flow which increases air conditioning performance, cooler engine operation, low profile, high performance, increased engine power and lowers fuel consumption.
- All Davies, Craig Thermatic® Fans offer reversible polarity and blades for bi-directional, upstream (pusher) and/or downstream (puller) air flow as standard equipment.
- All Davies Craig Customised Chrome Thermatic® Fan Kits are packaged complete with relay, wiring loom, mounting hardware and easy-to-follow fitting instructions for a quick and tidy installation.
As a primary cooling source electric fans provide:
- Economical replacement for failed original equipment.
- 5-10% increase in engine power and fuel saving when replacing fan clutch and fan assemblies
- Reversible blades for pusher (upstream) or puller (downstream) applications
- Compatibility with all electric fan controls
- Coverage for a wide variety of applications
As an add-on cooling source electric fans provide:
- Constant air flow regardless of vehicle speed constant air flow across the condenser
- Increased air conditioning performance due to constant air flow across the condenser
- With the conversion from R12 to R-134A refrigerant there is a need for additional condenser cooling to ensure the overall improved efficiency of the cooling system
- Increased fuel economy All of our electric fans kits are packaged complete with instructions and mounting hardware for quick and easy installation
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.
Straight vs. Curved Fan Blades - Dispelling the Myth!
The relative merits and technology of curved vs. straight fan blades, has been debated for some time. Davies, Craig conducted an extensive research program to formulate the design of fans in which several design types including curved blades with and without a ring were considered. Curved blades generated less noise but at the expense of a significant loss in performance caused by the fact that curved blades stall at a lower static pressure than straight blades. If a fan moves less air, then, simply you can expect less noise. As shown in the performance curves below, Davies, Craig Thermatic Fan outperforms its competitor across the full pressure range:
Noise Control: Most fan noise is generated from a blade passing a shroud strut. The noise level is higher when the whole length of a blade overlaps/passes a shroud strut and if all the blades pass all the struts of a shroud at the same time, NOISE IS AT ITS WORST. Some manufacturers have chosen to curve the blades and keep the struts straight. Since this approach significantly affects performance, Davies, Craig has proven it's best to adopt the reverse approach of having straight blades and curving the struts.
Our investigations also found that when air flowed in layers (laminar flow), it breaks up into counter rotating airflow vortices (whirlwinds):
These vortices consume energy and therefore reduce the airflow. It was found that by inserting triangular protrusions near the leading edge of the blade, the air is tripped into going into vortices earlier but they were much smaller and removed much less energy therefore making the blade more efficient. The idea of a ring around the blade tips was also researched and rejected since the performance suffered due to the increased energy required to propel the blade with the extra weight at the tips. While the purpose of a ring is to reduce losses from air passing from the high-pressure side of the blade to the low-pressure side as shown, Davies, Craig managed to achieve this by adding winglets to the blade tips without energy loss.
When all aspects of blade design are considered, straight blades with trips, winglets and the correct shroud is the optimum, test-proven combination for efficient fan operation.
Please visit our buy online section to view the Davies Craig Thermatic Electric Fan range.