Spark Ignition Aircraft Engine Endurance Test of Aviation ... - FAA

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Valve Recession (inches) 0.0220 0.0200 0.0180 0.0160 0.0140 0.0120 0.0100 0.0080 0.0060 0.0040 0.0020 50 70 90 110 130 150 170 190 Engine Hours Cylinder 1 Cylinder 2 Cylinder 3 Cylinder 4 Figure 28. Exhaust Valve Recession Table 12 shows the cylinder compression measurements. The engine was still showing pressures above 70 psig out of 80 psig applied at the end of the test. Typically, a value above 60 psig is considered acceptable. Table 12. Cylinder Compression Measurements Compression/80 psig Date Engine Hours Test Hours Cylinder 1 Cylinder 2 Cylinder 3 Cylinder 4 8/18/2005 9.3 0.0 64 68 74 77 9/6/2005 59.2 49.9 78 74 74 76 9/19/2005 109.4 100.1 75 76 76 77 10/13/2005 160.0 150.6 76 76 74 74 10/31/2005 193.5 184.2 75 77 77 76 Figures 29 through 31 show the combustion chamber of cylinder 1 after 9.3 engine hours of operation. There were no visible deposits on the spark plugs, piston faces, or valves. Also, the cylinder wall crosshatching, which is machined at the factory, is still visible. Figures 32 through 35 show cylinder 1 after 59.2 hours of operation. Note the accumulation of oil deposits on the bottom of the piston face and the fuel stains on the exhaust valve faces. 29
Figure 29. Top of Piston Face of Cylinder 1 After 9.3 Engine Hours Figure 30. Intake Valve Face of Cylinder 1 After 9.3 Engine Hours 30
Page 1 and 2: DOT/FAA/AR-06/43 Office of Aviation
Page 3 and 4: 1. Report No. DOT/FAA/AR-06/43 4. T
Page 5 and 6: LIST OF FIGURES Figure Page 1 Oil F
Page 7 and 8: 46 Posttest Connecting Rod Bearing
Page 9 and 10: LIST OF ACRONYMS 100 low-lead 100LL
Page 11 and 12: more fuel volume flow. Future tests
Page 13 and 14: At the completion of the test, the
Page 15 and 16: The engine was installed in a test
Page 17 and 18: Table 4. Parameter Settings for End
Page 19 and 20: Figure 1. Oil Filter Inspection Fig
Page 21 and 22: Figure 4. Corrected Power at 2700 r
Page 23 and 24: Figure 8. Corrected Power at 2300 r
Page 25 and 26: Figure 10. Corrected BSFC vs Fuel M
Page 27 and 28: Figure 12. Corrected Power and Aver
Page 31 and 32: Table 8 provides a summary of the e
Page 37 and 38: output from all six cylinders. Pist
Page 39: The oil filter was cut open and the
Page 43 and 44: Figure 33. Bottom of Piston Face an
Page 45 and 46: Figure 39. Posttest Crankshaft Conn
Page 47 and 48: The camshaft lobes, shown in figure
Page 49 and 50: Figure 59 shows a combustion chambe
Page 51 and 52: Figure 63. Posttest Rocker Arm Show
Page 53 and 54: Visual observation of the intake tu
Page 55 and 56: Future testing should address effec
Page 57 and 58: Table A-2. Middle and Rear Main Cra
Page 59 and 60: Table A-4. Valve Tappet Outer Diame
Page 61 and 62: Table A-10. Top Piston Ring Side Cl
Page 63: Table A-14. Intake Valve Seat Width

Spark Ignition Aircraft Engine Endurance Test of Aviation ... - FAA

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