Table 1 Single Cylinder Engine Specifications

Bore Diameter 5.4"

Stroke 6.5"

Displacement Volume 149 cu. in.

Number of Intake Valves 2

Number of Exhaust Valves 2 Injection System Jerk Pump, Hole Nozzle

Length of Connecting Rod 10.3"

Piston Pin Diameter 2"

Journal Diameter 3.82"

Main Bearing Diameter . 4.26"

Diameter of Exhaust Valve 1.65"

Diameter of Intake Valve 1.77"

The coated firedeck is shown in Fig. 2. The stock aluminum piston was modified to accept a steel piston crown for coating with ceramic material. The stock aluminum piston (left) and modified coated piston (right) are shown in Fig. 3. A 0.005-inch super alloy bond coating (NiCrAlY)

test condition refers to the all-metal engine tested at baseline conditions. The insulated engine will be referred to as* the LHR engine. LHR engine tests were conducted at baseline conditions (baseline ceramic) and at high coolant temperature (hot ceramic) as shown in Table 2. The six

Fig. 3. Comparison Between Stock Aluminum Piston (left) and Modified Ceramic-Coated Piston (right)

2. Previous studies at SwRl(7) have shown that increased cylinder liner temperature has no effect on indicated specific fuel consumption.

3. A cool cylinder liner helped to reduce the problem of increased particulate and unburned hydrocarbon emissions due to burning oil in low heat rejection engines.

The hot ceramic engine tests were conducted at standard, retarded, and advanced fuel injection timings. The LHR engine tests were conducted by repeating the baseline data points using the same fuel flow and adjusting the boost pressure

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