Information taken from Rover workshop manual.
| Engine |
| Type |
Water cooled, overhead camshaft |
| Number of cylinders |
Four |
| Bore |
3.375 in (8.57 cm) |
| Stroke |
3.375 in (8.57 cm) |
| Capacity |
120.8 cu/in (1978cc) |
| Compression ratio - standard |
9:1 |
| Compression ratio - for certain exports |
7.5:1 |
| Brake horsepower |
| Gross |
| 9:1 compression ratio |
7.5:1 compression ratio |
| 99 at 5,000 rpm |
87.5 at 5,000 rpm |
|
| Installed |
| 9:1 compression ratio |
7.5:1 compression ratio |
| 90 at 5,000 rpm |
80 at 5,000 rpm |
|
| Maximum torque |
| Gross |
| 9:1 compression ratio |
7.5:1 compression ratio |
| 121 lb/ft (16 mkg) at 3,600 rpm |
113 lb/ft (15 mkg) at 3,500 rpm |
|
| Installed |
| 9:1 compression ratio |
7.5:1 compression ratio |
| 113 lb/ft (15.5 mkg) at 2,750 rpm |
106 lb/ft (14.8 mkg) at 2,500 rpm |
|
| Maximum BMEP, Installed |
| 9:1 compression ratio |
141 lb/sq.in at 2,750 rpm |
| 7.5:1 compression ratio |
132 lb/sq.in at 2,500 rpm |
| Compression pressure at cranking speed (200 rpm) |
| 9:1 compression ratio |
160 lb/sq.in minimum |
| 7.5:1 compression ratio |
120 lb/sq.in minimum |
| Pistons |
| Speed |
2,810 ft/minute at maximum bhp |
| RPM |
| Maximum |
6,000 |
| Spark plugs |
| 9:1 compression ratio |
Champion N9Y - 14 mm with supressors and waterproof covers |
| 7.5:1 compression ratio |
Champion N5 - 14 mm with supressors and waterproof covers |
| Point gap |
0.025 in (0.70 mm) |
| Ignition timing |
| 9:1 compression ratio, 95-97 octane fuel |
4 degrees BTDC |
| 7.5:1 compression ratio, 79-93 octane fuel |
6 degrees BTDC |
| Firing order (both compressions) |
1 - 3 - 4 - 2 |
| Distributor |
| Contact breaker gap |
0.014 to 0.016 in (0.35 to 0.40 mm) |
| Valve timing |
| Inlet opens |
18 degrees BTDC |
| Inlet closes |
42 degrees ABDC |
| Exhaust opens |
48 degrees BBDC |
| Exhaust closes |
12 degrees ATDC |
| No. 1 exhaust valve peak |
108 degrees BTDC |
