Mi16 - What is it?

Mi 16 peugeot engine modifications.The 1905 cc and 1998 cc 16-valve engines are of the DOHC (double overhead camshaft) type. 

Engine codes:

The XU series engine is a well-proven engine which has been fitted to many previous Peugeot and Citro?n vehicles. The engine is of the in-line 4-cylinder type, mounted transversely at the front of the car.The clutch and transmission are attached to its left-hand end. The connecting rods rotate on horizontallysplit bearing shells at their big-ends. The pistons are attached to the connecting rods by gudgeon pins. The gudgeon pins are a sliding fit in the connecting rod, and are secured with circlips.

On 1905 cc models, the cylinder block is of the “wet-liner” type. The cylinder block is cast in aluminium alloy, and the bores have replaceable cast-iron liners that are located from their top ends. Sealing O-rings are fitted at the base of each liner, to prevent the escape of coolant into the sump.

On 1998 cc models the engine is of the conventional “dry-liner” type. The cylinder block is cast in iron, and no separate bore liners are fitted. Both inlet and exhaust camshafts are driven by a toothed timing belt.The camshafts operate the sixteen valves via self-adjusting hydraulic tappets (fitted to the cam followers), thus eliminating the need to manually adjust the valve clearances. Both camshafts run in bearing caps which are bolted to the top of the cylinder head. The inlet and exhaust valves are each closed by coil springs, and operate in guides pressed into the cylinder head.
On all models, the water pump is driven by the timing belt.
An oil cooler is mounted beneath the oil filter cartridge, to keep the oil temperature constant under severe operating conditions. The oil cooler is supplied with coolant from the engine cooling system.

Some useful information about Mi16 engines:

Designation:

1905 cc engine  -  XU9
1998 cc engine  -  XU10

Bore:

1905 cc engine  -  83.00 mm

1998 cc engine  -  86.00 mm

Stroke:

1905 cc engine  -  88.00 mm
1998 cc engine  -  86.00 mm

Direction of crankshaft rotation - Clockwise (viewed from the right-hand side of vehicle).
No 1 cylinder location - At the transmission end of block.

Compression ratio (typical):

1905 cc 16-valve engine - 9.7 : 1 to 10.4 : 1 (according to model)
1998 cc 16-valve engine - 10.4 : 1

Lubrication system:
Oil pump type - Gear-type, chain-driven off the crankshaft right-hand end
Minimum oil pressure at 90°C:
XU9 engine - 4.1 bars at 4000 rpm
XU10 engine - 5.2 bars at 4000 rpm
Oil pressure warning switch operating pressure - 0.8 bars 

Thermostat Opening temperatures:
1905 cc engines: 88°C
1998 cc engines: 89°C

Fully open:

1905 cc engines: 100°C
1998 cc engines: 101°C

Capacities:

1.Engine oil - 5.0 litres

2.Cooling system (approximate) - 7.0 litres

3.Manual gearbox - 2.0 litres

4.Power steering system - 0.7 litres 

5.Fuel tank - 70 litres 

Idle speed: 925 ± 25 rpm

Fuel/exhaust systems:

D6C - Bosch Motronic ML4.1 multi-point
RFY - Bosch Motronic MP3.2 multi-point

Recommended fuel:

D6C - 97 RON leaded.
RFY - 95 RON unleaded.

Starting systems type:

12-volt, negative earth.

Battery Charge condition:

Poor - 12.5 volts
Normal - 12.6 volts
Good- 12.7 volts