Textron Lycoming IO-540 Series - Page 23

TEXTRON LYCOMING OPERATOR'S MANUAL
0-540 & 10-540 SERIES SECTION 2
SPECIFICATIONS
IO-540-AA SERIES
FAA Type Certificate ..................................... 1E4
Rated horsepower ........................................ 250
Rated speed RPM ....................................... 2425
Bore, inches ............................................ 5.125
Stroke, inches .......................................... 4.375
Displacement cubic inches ................................. 541.5
Compression ratio ........................................ 7.3:1
Firing order ............................................
1-4-5-2-3-6
Spark occurs, degrees BTC ........... .................... 20
°
Valve rocker clearance (hydraulic tappets collapsed) .......... 028-.080
Prop. drive ratio ........................................ 1:1
Prop. driven rotation ..................................... Clockwise
IO-540-AB SERIES
FAA Type Certificate ..................................... 1E4
Rated horsepower ........................................ 230
Rated speed RPM .......................................
2400
Bore, inches ............................................ 5.125
Stroke, inches ........................................ 4.375
Displacement cubic inches ................................. 541.5
Compression ratio ..................................... .8.5:1
Firing order ............................................ 1-4-5-2-3-6
Spark occurs, degrees BTC ................................ 23
°
Valve rocker clearance (hydraulic tappets collapsed) .......... 028-.080
Prop. drive ratio ........................................ 1:1
Prop. driven rotation ..................................... Clockwise
Added January 1997 2-5