The 0-320 Lycomings have an ignition system similar to that of the 0-235 arid 0-290 engines, and also employ the Scintilla 84LN-20 and –21 magnetos, except as noted in the model list below. The induction system, too is practically the same, except that the 0-320 is fitted with a Marvel-Schebler MA-4SPA carbureytor.
The AN 20010 propeller governor drive furnished with the 0-320 allows installation of a constant speed governor and a single - acting controllable pitch prop. High pressure oil is carried from the governor, which is mounted on the accessory housing, to the front of the crankcase by way of an external oil line. The oil then flows into the hollow front section of the crankshaft through indexing holes in the crankcase, front main bearing, and crankshaft.
Cylinder bore | 5.125 in. |
Stroke | 3.875 in. |
Displacement, cubic inches | 319.8 |
Compression ratio | 7.00:1 |
Rated rpm | 2,700 |
Rated horsepower | 150 |
Cruising rpm | 2,450 |
Dry weight | 268 lbs. |
Oil pressure, normal | 65 to 85 psi |
Oil pressure, minimum at idle | 25 psi |
Oil sump capacity | 8 qts |
Fuel grade, octane | 80/87 |
Spark advance, BTC | 25 degrees |
Tappet setting, cold engine | .028 to .080 inches |
Model | Hp | rpm | Fuel | C.R. | Description |
0-320-AlA | 150 | 2700 | 80/87 | 7.00:1 | Controllable prop, 25-deg spark advance |
0-320-A2A | 150 | 2700 | 80/87 | 7.00:1 | Same as A1A but fixed pitch propeller |
0-320-A3A | 150 | 2700 | 80/87 | 7.00:1 | Same as A1A with 7/16' prop bolts |
0-320-A1B | 150 | 2700 | 80/87 | 7.00:1 | Same as A1A with straight riser in oil sump and -32 carburettor |
0-320-A2B | 150 | 2700 | 80/87 | 7.00:1 | Same as A2A with straight riser in oil sump and -32 carburettor |
0-320-A2C | 150 | 2700 | 80/87 | 7.00:1 | Same as A2B with retard breaker mags |
0-320-A2A | 150 | 2700 | 80/87 | 7.00:1 | Same as E3D with conical mounts |
0-320-A3B | 150 | 2700 | 80/87 | 7.00:1 | Same as A3A except for straight riser in oil sump and -32 carburettor |
0-320-A3C | 150 | 2700 | 80/87 | 7.00:1 | Same as A3B except for retard breaker mags |
0-320-B1A | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as A1A but high compression |
0-320-B2A | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B1A but fixed pitch propeller |
0-320-B3A | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B1A except 7/16 prop bolts |
0-320-B1B | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B1A except straight riser in oil sump and -32 carburettor |
0-320-B2B | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B2A except straight riser in oil sump and -32 carburettor |
0-320-B2C | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B2B except retard breaker mags |
0-320-B3B | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B1A except E 7/16 prop bolts, straight riser in oil sump, and -32 carburettor |
0-320-B3C | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B3B except retard breaker mags |
0-320-C1A through | 150 | 2700 | 80/87 | 7.00:1 | Low compression field service conversions of B1A through B3C |
0-320-L1A | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as B3B but type one dynafocal mounts |
0-320-D2A | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as D1A but with fixed pitch prop and 3/8 attaching bolts |
0-320-D1B | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as D1A but retard breaker mags |
0-320-D2B | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as D2A but retard breaker mags |
0-320-D1C | 160 | 2700 2700 | 100/30 or91/96 | 8.50:1 | Same as D2C but provision for controllable prop |
0-320-D2C | 160 | 2700 | 100/130 or 91/96 | 8.50:1 | Same as D2A except-1200 series mags |
0-320-D1F | 160 | 2700 | 80/87 | 7.00:1 | Same as E1F except high compression pistons |
0-320-D2F | 160 | 2700 | 80/87 | 7.00:1 | Same as E2F except high compression pistons |
0-320-ElA | 150 | 2700 | 80/87 | 7.00:1 | Same as A3B but with type 1 dynafocal mounts |
0-320-E2A | 150/ 140 | 2700/ 2450 | 80/87 | 7.00:1 | Same as E1A but fixed pitch prop, 3/8 attaching bolts, and alternate rating of 140- hp |
0-320-E1B | 150 | 2700 | 80/87 | 7.00:1 | Same as E1A except retard breaker mags |
0-320-E2B | 150 | 2700 | 80/87 | 7.00:1 | Same as E2A except retard breaker mags |
0-320-E1C | 150 | 2700 | 80/87 | 7.00:1 | Same as E1B |
0-320-E2C | 150/ 140 | 2700/2450 | 80/87 | 7.00:1 | Same as E2A but -1200 series mags and alternate rating of 140-hp |
0-320-E2D | 150 |
| 80/87 | 7.00:1 | Similar to E2A but with Slick 'throw away' mags and 0-235 front |
0-320-E3D | 150 | 2700 2700 | 80/87 | 7.00:1 | Same as E2D but with3/8 prop flange bolts |
0-320-ElF | 150 | 2700 2700 | 80/87 | 7.00:1 | Same as E1C but with prop governor drive on left-front of crankcase |
0-320-E2F | 150 | 2700 | 80/87 | 7.00:1 | Same as E1F but with fixed pitch prop |
0-320-E2G | 150 | 2700 | 80/87 | 7.00:1 | Same as E2D but with0-320-A sump and take pipes |
0-320-E2H | 150 | 2700 | 80/87 | 7.00:1 | Same as E2D but with S4LN-20 and -21 mags |
0-320-E3H | 150 | 2700 | 80/87 | 7.00:1 | Same as E3D but with S4LN-20 and -21 mags |
The IO-320's are equipped with Bendix fuel injection systems and are designated 10-320-AlA through AI0-320-C1B. The I0-320-AlA, -A2A, -E1A, and -E2A are 150-hp and use 80/87 fuel. All others are rated at 160-hp @ 2700 rpm with 8.50:1 compression ratios. Significant models are:
LIO-320-B1A | 160 | 2700 | 100/130 | 8.50:1 | Similar to 10-320-BlA but with left hand rotation |
LIO-320- CIA | 160 | 2700 | 100/130 | 8.50:1 | Similar to 10-320-C1A but with left hand rotation |
L10-320- C1A | 160 | 2700 | 100/130 | 8.50:1 | Same as B1B but converted for turbocharger; long reach spark plugs, piston cooling oil jets, -21 mags and AN fuel pump drive |
AIO-320- A1A | 160 | 2700 | 100/ 130 or 91/96 | 8.50:1 | Aerobatic engine with Bendix RSA-5ADI fuel injection |