VERSIONS

There are no less than 86 different versions of Lycoming’s highly successful 0-360-series four cylinder engines. Of these, 27 are carburetted models of 180hp; there are seven low compression carburetted versions of 168 hp; one fuel injected model of 177hp, 10 fuel injected versions of the 180 hp engine; 22 fuel injected models of 200 hp, including five aerobatic versions; three turbocharged models of 200 hp, and 16 helicopter configurations with ratings of 180, 190, 205, 225 and 230 hp. The list of current production aircraft powered with these engines is too long to include here.

CONFIGURATION

The 0-360s evolved from the 0-235 and 0-320 engines and are similar in basic design and layout. The cylinders are made with two major components, head and barrel, screwed and shrunk together. The heads are made from an aluminium alloy casting with a machined combustion chamber. Rocker shaft bearing supports are cast integral with the head along with housings to form the rocker boxes.

A convention type camshaft is located above and parallel to the crankshaft. The camshaft actuates hydraulic tappets, which operate the valves through pushrods and valve rockers. The valve rockers are supported on fully floating steel shafts. The valve springs bear against hardened steel seats and are retained on the valve stems by means of split keys.

The crankcase assembly consists of two reinforced aluminium alloy castings, fastened together at the crankshaft centreline in the vertical plane. The mating surfaces of the two castings are joined without a gasket and the main bearing bores are machined for use of precision main bearing inserts.

The crankshaft is made from a chrome nickel molybdenum steel forging. All bearing journal surfaces are nitrided.

The connecting rods are made in the form of H sections from alloy steel forgings. They have replaceable bearing inserts in the crankshaft ends and bronze bushings in the piston ends. The bearing caps on the crankshaft ends are retained by two bolts and nuts through each cap.

The pistons are machines from aluminium alloy. The piston pin is of the fully-floating type with a soft alloy plug located at each end of the pin to prevent scoring of the cylinder wall. Depending of the cylinder assembly, pistons may be machined for either three or four rings, and may employ half wedge or full wedge rings. Consult the latest revision of Service Instruction #1037 for proper piston and ring combinations.

The oil sump contains an oil drain plug, oil suction screen, mounting pad for carburettor or fuel injector, the intake riser and intake pipe connections. Crankcase covers are employed on the fuel-injected aerobatic engines (AI0-360's).

INDUCTION SYSTEMS

The 0-360 series engines are equipped with either a float type or pressure type carburettor. Distribution of the fuel-air mixture to each cylinder is obtained through the induction system which is integral with the oil sump.

The 10-360 and AIO-360 series engines are equipped with a Bendix RSA fuel injector (except for the 10-360-BiA which has a Simmonds 530 fuel injector). The fuel injection system schedules fuel flow in proportion to air flow, and fuel vaporization takes place at the intake ports. On the TIO-360 series, the turbocharger is mounted as an integral part of the engine. Automatic waste gate control of the turbocharger provides constant air density to the fuel injector inlet from sea level to critical altitude.

The float type carburettors used are the Marvel-Schebler MA-4-5 and IIA-6, which are single barrel with manual mixture control, and the Marvel-Schebler MA-4-5AA, also single barrel, but with automatic pressure altitude mixture control. The -5AA carb does not have a manual mixture control.

The Bendix-Stromberg PSH-5BD carburettor is pressure-operated, with a single horizontal barrel, incorporating an airflow-operated power enrichment valve and an automatic mixture control unit. It also has a manual mixture control which works independently of, and in parallel with, the automatic mixture control.

FUEL

All models of the 180hp 0-360s and IO-360s use 100/130 octane fuel. All 200hp IO-360s and AIO-360s use 100/130 octane fuel. The 168hp 0-360s are supposed to use 80/87 octane fuel.

DRY WEIGHTS

Dry weight of the 0-360s, including carburettor, mags., ignition harness, engine baffles, spark plugs, tach. drive, starter and generator or alternator, ranges from 282lbs to 290 lbs, The IO-360s range in weight from 296lbs to 332 lbs., while the TI)-360 weights 386 lbs.

AI0-360s weigh 325lbs with accessories; are 30.8 ins in length, 20.76 ins in height and 34.25 ins wide.

The 0-360s range in length from 29.56 ins to 30.70 ins; are 24.59 ins in height and 33.37 ins wide.

The I0-360s range in length from 30.37 to 33.65 ins in length; from 20.47 to 22.47 ins in height and are 33.37 ins wide.