Exhaust Primer
Exhaust Primer Features
- Adapters are made of durable cast iron, which can be easily welded to exhaust stack.
- Adapters are also threaded to fit a standard exhaust pipe.
- Ejectors and valves are made of solid cast bronze.
- This simple design has no moving parts, eliminating wear and need for replacement.
- Under normal conditions, suction lifts reach 15 feet in 1 minute and 20 feet in less than 2 minutes.
- It fits all sizes of engines from 15hp to 600hp.
- The Exhaust Valve closes automatically after priming to prevent rain and dust from entering the exhaust stack.
Special Features:
- Plain-ended adapters are available in most sizes.
- When ordering primers, specify the pipe size and the thread of the exhaust stack or if a special adapter is needed.
The Exhaust Primer is an air ejector adapted to an engine-driven pump. An adapter is attached to the exhaust stack to which the ejector is attached, and a lever-operated "exhaust valve" is provided by which the engine exhaust gases are momentarily diverted through the ejector during the priming period. It normally takes anywhere from10 seconds to 2 minutes depending on the suction lift and length and size of the suction line. Operating on low engine exhaust pressure, they are also semi-automatic, efficient, easy to install, and economical. Since there are no moving parts, they will last indefinitely.
Under ideal conditions, at sea level, suction lifts of 25 ft may be obtained. For average conditions suction lifts up to 20 ft may be expected.
All standard Protek Exhaust Primers are designed to operate at 12 to 15 lb pressure and thereby provide maximum lift and rapid priming. Note that exhaust primers generally will not work effectively on single cylinder engines because of the pulsating pressure effect, nor will they work well on two-cycle (two stroke) engines because this type engine does not produce enough back pressure for the ejector to function properly.Since the volume of the exhaust air discharged from an engine is dependent on its piston displacement and speed it is most important that the proper size ejector be used.
Normal speeds for small engines are usually higher than for large engines, therefore primers may be generally classified in four groups as follows:
| PRIMER SELECTION CHART | |||||||||
|
PRIMER |
ENGINE DISPLACEMENT (CUBIC INCHES) | ||||||||
| 50 | 100 | 150 | 200 | 250 | 300 | 400 | 500 | 600 | |
| 60/90 | 2200 | 1700 | 1500 | ||||||
| 150/225 | 2300 | 1600 | 1500 | 1200 | |||||
| 250/300 | 2300 | 1900 | 2500 | 1200 | |||||
| 350/500 | 1900 | 1500 | 1400 | ||||||
Installing a tachometer on the engine to determine the exact speed at which the primer operates best can do this. A more practical and economical method is to install a pressure gauge permanently at the engine exhaust and instruct the operator to run the engine at the speed required, producing the proper pressure at the primer.
After the ejector has been installed on the engine a vacuum gauge should be connected to the ejector using a tee, which comes included with the Exhaust Primer.
Since air leaks are always a major problem in pump hook-ups and are more prevalent in portable pumping units than any other, they are the major source of trouble in priming a pump. Air leaks may cause excessive priming time or make priming impossible. Leaks may appear in the suction connections, the discharge valve, or the shaft packing.Protek Exhaust Primers are made of bronze and will last many seasons of normal use. About the only thing that will affect their operation would be an accumulation of trash, dirt or soot from the engine exhaust.
This information is set forth in general terms for the benefit of distributors who should apply it to their own specific applications. Distributors are encouraged to provide appropriate instructions to their customers.
* NOTE: It was previously thought that the Exhaust Primer wouldn't be safe to use on turbo engines. However, we recently discovered that this is not the case as long as the RPMs are kept between 1100 and 1200. Check back in the future for an updated Primer Selection Chart. Engine Displacement can be determined by the liter size of the engine.
