. Railway mechanical engineer . demand for an en^ineas simple as a slide valve steam engine. There are many smallsteam plants burning oil, where the fuel totals 2 to 4 lb. per oil engine delivers the power on .4 to .6 lb. of oil, but never-theless is worthless to a plant owner unless it is simple and reli-able and can be operated by an ordinary mechanic. The accompanying photographs illustrate the 200 hp., 270 , Nordberg high compression oil engine. These engines re- Nordbeig 200 hp. High Compression Oil Engine semble Diesel engines insofar as concerns the method of ignitionby
. Railway mechanical engineer . demand for an en^ineas simple as a slide valve steam engine. There are many smallsteam plants burning oil, where the fuel totals 2 to 4 lb. per oil engine delivers the power on .4 to .6 lb. of oil, but never-theless is worthless to a plant owner unless it is simple and reli-able and can be operated by an ordinary mechanic. The accompanying photographs illustrate the 200 hp., 270 , Nordberg high compression oil engine. These engines re- Nordbeig 200 hp. High Compression Oil Engine semble Diesel engines insofar as concerns the method of ignitionby the heat of the highly compressed air. The compression pres-sures are about 450 lb., but a three-stage high pressure air com-pressor for 1,000 lb. pressure for injecting and atomizing thefuel is not used. The fuel is injected mechanically by a smallpump and discharges through a new type of atomizing headwhich successfully subdivides and atomizes the oil. The suc-cess of the engine is due largely to the effective working of this. Fuel Injection Pumps, Strainer Tank and Air Starting Gear atomizing head. The elimination of the high pressure compres-sor with its intercoolers simplifies the installation in small plants,for which these engines are designed. The engine is of the two-cycle design, and all valves, cams,springs and valve gear have been eliminated, contributing fur-ther to the item of simplicity and ease of attendance and inspec- DnTi. Ilie head is a simple symmetrical casting and is not subjectlo cracks due to unequal expansion strains. There are novalves in the head. The only valve on the engine is a pistonvalve for scavenging air, located above and between the cylin-ders. One valve controls the scavenging air for the two cylin-ders. Air is compressed on the crank side of the piston andby-passed to the head end shortly after the uncovering of theexhaust valves. This forces the burnt gases out of the cylinderand fills it with fresh air. Compression and combustion thenocc
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
