Rover IOE
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- Last Updated on Wednesday, 19 October 2011 10:12
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The intake/inlet over exhaust (IOE) engine design, also known as F-head and pocket valve, is a valvetrain configuration used in early four-stroke internal combustion engines. The configuration consists of intake valves located in the cylinder head and exhaust valves located in the cylinder or engine block.
The IOE design allowed the use of much larger valves than a side valve or overhead valve engine. Its advantages over the flathead also included better intake mixture flow and greater reliability from its cooling of the exhaust valve and its spring.
The Rover Company produced a more advanced form of IOE engine design that was in production from 1948 until the early 1980s. Unlike the F-head, this had an efficient combustion chamber designed for good combustion, rather than simple manufacture. The top surface of the block was machined at an angle, with the piston crowns angled to match. At TDC, the piston almost touched the angled inlet valve and provided good 'squish' to the combustion chamber itself, offset to the side by half a cylinder diameter. The resultant combustion chamber shape was a near-ideal hemisphere, although inverted and tilted from the usual "hemi-head" design. The spark plug was centrally mounted and this, together with the turbulence generated by the squish, provided a short flame path. The thinness of the gas layer between piston and inlet valve was so confined as to reduce the risk of detonation on poor fuel, one factor that kept it in service with Land Rover for so long.
The Rover IOE engine family encompassed straight 4 engines of 1.3, 1.6 and 2.0-litre capacities and straight 6 engines of 2.1, 2.2, 2.3, 2.6 and 3.0 litre capacities and powered much of the Rover company's post-war range of vehicles in the form of the P3, P4 and P5 models.
Rover 1.6 IoE engine and transmission - Pic courtesy of The Land Rover Shop
Rover 1.6 litre and 2.0 litre IOE engines
The Land Rover Series I used adapted versions of the 4 cylinder 1.6 litre (fitted 1948-1952) and 2.0 litre (fitted 1952-1958) IOE engines, with the 2.0 engine continuing on to very early Series II models, although it was replaced by the new 2.25 litre OHV petrol engine after just 1500 examples with the 2.0 IOE engine had been built.
Engine Code: 1.6 IOE - code unknown
Layout: 4-cylinder, in-line
Block/Head: Cast iron/cast iron
Valves: IOE, chain-driven camshaft, push-rod operated
Capacity: 1,595 cc (97.33 cu. in)
Bore x stroke: 69.5 mm x 105 mm (2.74 in x 4.13 in)
Compression ratio: 6.8:1
Fuel injection: Solex 32 PBI-2 carburettor
Power: 50 bhp (37 kW) @ 4,000 rpm
Torque: 80 lbf·ft (109 N·m) @ 2,000 rpm
Production: 1948-1952 (for Series models)
Used in: Land Rover Series I.
Engine Code: 2.0 IOE - code unknown
Layout: 4-cylinder, in-line
Block/Head: Cast iron/cast iron
Valves: IOE, chain-driven camshaft, push-rod operated
Capacity: 1,997 cc (121.9 cu. in)
Bore x stroke: 77.8 mm x 105 mm (3.06 in x 4.13 in)
Compression ratio: 7:1
Fuel injection: Solex Carburettor
Power: 52 bhp (39 kW) @ 4,000 rpm
Torque: 101 lbf·ft (137 N·m) @ 1,500 rpm
Production: 1952-1958 (for Series models)
Used in: Land Rover Series I, Early Series II, Rover P4.
Rover 2.6 IOE engine
The 2.6 litre 6 cylinder IOE engine had a very long career, this particular version of the 2.6 IOE being a short stroke derivative of the 3.0 IOE developed for the Rover P5. The new 2.6 was originally employed in the Rover P4 100 from 1960. After being used in Rover's car models it became an option in the IIb forward control model from 1966, and for long-wheelbase Series Land Rover models from 1967, for which it remained an optional fitment until 1980 when it was replaced by Rover's 3.5 litre V8 engine, as supplied in the Series III 109" V8 or Stage 1.
Weslake versions of the 3.0 IOE engine were trialled in the 101" FC prototypes, but Rover opted for the 3.5 V8 engine in this model in the end due to weight constraints imposed by this model's main customer, the British Armed Forces.
Engine Code: 2.6 IOE - codes unknown
Layout: 6-cylinder, in-line
Block/Head: Cast iron/cast iron
Valves: IOE, chain-driven camshaft, push-rod operated
Capacity: 2,625 cc (160.2 cu. in)
Bore x stroke: 77.8 mm x 92 mm (3.06 in x 3.62 in)
Compression ratio: 7:1 or 7.8:1
Fuel injection: SU HD6 carburettor or Zenith Stromberg 175 CD2
Power: 83 bhp (62 kW) @ 4,500 rpm (7:1) 90 bhp (67 kW) @ 4,500 rpm (7.8:1)
Torque: 128 lbf·ft (173 N·m) @ 1,500 rpm (7:1) 131 lbf·ft (178 N·m) @ 1,500 rpm (7.8:1)
Production: 1960-1980
Used in: Land Rover Series II,IIa, III, IIb FC, Rover P4
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