MG Car Engine - Magnette Mk 4, Maestro, Montego0
MG got its name from
"Morris Garages" and carried a variety of engines. The MG Midget MkI (1961-1964). This was the first
version, essentially a badge engineered version of the Austin-Healey Sprite MKII
and retained the quarter elliptic sprung rear axle from the original Sprite. The
engine was a 948 cc A-Series with twin SU carburettors producing 46 hp (34 kW) at
5500 rpm and 53 ft·lbf (72 Nm) at 3000 rpm. Reconditioned, Used or Secondhand
MG car engines are availble here.
The MG Midget MkII
(1964-1966). The engine got better (1098 cc A-Series I4) bearings allowing the power
to be increased to 59 hp (44 kW) at 5750 rpm and torque to 65 lbf·ft (88 Nm) at
The MG Midget MkIII
(1966-1974). The engine now grew to 1275 cc A-Series I4 using the development seen
on the Mini Cooper S. Output was 65 hp (48 kW) at 6000 rpm and 72 ft·lbf (98 Nm)
at 3000 rpm. However, this was a de-tuned version of the engine that was given to
the Cooper S. The Midget retained the standard 12G940 cylinder head casting that
was common to other BMC 1300 cars, whereas the Cooper S had a special head with
an extra two bolts to fasten it to the cylinder block.
The MG Midget 1500 (1974-1979). The A-Series engine was dropped
to be replaced by the 1493 cc unit from the Triumph Spitfire.
The meaning of A-Series I4.
- BMC A-Series engine
is a small straight-4 automobile engine, the A-Series, is one of the most common
in the world. The straight-4 or inline-4 is an internal combustion engine with four
cylinders aligned in one row. Nicknamed a four-banger, this straight engine configuration
is the most common in cars with a displacement up to 2.3 litres. The current "practical"
limit to the displacement of straight-4 engines in a car is around 2.7 litres. However,
in tractors and other construction machinery, four-cylinder diesel engines with
a displacement of 4.5 litres and above can still be found.
- The straight-4 (I4) engine
is not a balanced configuration. While a pair of pistons is always moving up at
the same time as the other pair is moving down, piston speed - as with all internal
combustion engines - is higher through the top 180 degrees of the stroke than the
bottom 180 degrees, which leads to a secondary harmonic imbalance. While this is
tolerable in a small low-displacement low-power configuration, the vibrations get
worse with increasing size and power. Most straight-4 engines below 2.0 L in displacement
rely on the damping effect of their engine mounts. Today, most engineers will make
use of balance shafts above that limit. A 4-cylinder engine needs two balance shafts,
rotating at twice the crankshaft frequency, to be smooth. Nevertheless, there were
several samples of larger straight-4s in production using no balance shafts, such
as the Citroën DS 23 2347 cc engine that was a derivative of the Traction Avant
engine, and the 1948 Austin 2660 cc engine used in the Austin-Healey 100 and Austin
Atlantic. These engines were generally the result of a long incremental evolution
process and their power was kept relatively low regarding their capacity.
The roadster was the
first of the MGB range to be produced. It had a BMC B-Series I4 engine. BMC B-Series
was a straight-4 automobile engine family created as a larger alternative to the
company's A-Series. Displacements ranged from 1.2 L, 1.6 L, and even 2.4 L. Available
production was the MKII, MKIII, MGB GT, MGC this was a 2911 cc,
straight-6 version, MG began offering the MGB GT V8,
MG RV8 was a V8 3946 cc.
The meaning of B-Series.
- The BMC
B-Series engine was of conventional construction with a one piece
crankcase and cylinder block in cast iron with cylinder head also usually in cast
iron. The sump was made from
pressed steel. Early engines used a three bearing crankshaft
but later engines used five bearings. On all except the rare twin overhead camshaft
variant the camshaft, which was chain driven and mounted low in the block, operated
the overhead valves via pushrods and rocker arms. The two inlet ports in the non-crossflow
cylinder head were shared between cylinders 1 + 2 and 3 + 4 and the three exhaust
ports between cylinder 1, 2 + 3 and 4. Valve clearance was adjustable by screws
on the rocker arms with access to the tappets by two side covers on the engine block,
this feature being a probable hang over from side valve engine design.
Other recent models included:
1961-1968 MG Magnette Mk. IV
1983-1991 MG Maestro
1985-1991 MG Montego
1985 MG E-XE
1995-2005 MG F
2002-2005 MG TF
2001-2005 MG ZR
2001-2005 MG ZS
2001-2005 MG ZT
2002-2005 MG XPower SV
1980s MG Metro van
2003-2005 MG Express