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Year:  1972
Model:  300 SEL
Colour:  SILVER
Transmission:  AUTOMATIC
Engine Capacity:  8 CYL.
1972 MERCEDES BENZ 300SEL 4.5 


The Mercedes-Benz W109 vehicles equipped with the 4.5L SOHC cast-iron block m117 V8 were produced, starting in early 1971. The 4.5 engine was released by MB initially for the North American market, to get around the tougher emissions standards without killing the engine output and performance of the 3.5L engine. The m117 4.5 is very similar to the 4.5, with a 30mm taller stroke. The heads were also given larger combustion chambers, lowering compression to 8.8:1 or 8.0:1, depending on engine variation and production date. Power was 230HP or 200HP, depending on compression. The D-Jet EFI system was tuned further for the 4.5, with a specific ECU that gave a 10% full-throttle enrichment. This (along with a taller rear-end gear) allowed the 4.5 to have similar efficiency to the 3.5, yet more power on full throttle.

By the numbers

The 109 Chassis Mercedes Benz vehicles with the 4.5L m117 V8 engine are still, to this date, sought after by many people who owned one of these in the early 70's (or who had a family member or friend with one of these vehicles). Also, many people who live in Europe are buying rust-free examples from the USA and shipping them back to Europe. The 4.5 wasn't actually offered in Europe at the time, and it has perhaps a stronger following than the 3.5 in Europe.

Brand name
The name of the company, which has manufactured this vehicle.
The series the vehicle's model belongs to.
Model name
The model name of the vehicle.
300 SEL 4.5
Produced since
The year since the model has been in production.
Model code
The code provided by the manufacturer, which marks this model.
W 109 E 45
Model family
A family this model belongs to.
W 109
Type of vehicle
Information about the body type of this vehicle.
Number of doors
The number of doors the vehicle has.
Number of seats
The number of seats the vehicle has.
The horizontal distance between the centers of the front and rear wheels. The distance between the front and rear axle.
2850.00 mm (millimeters)

112.2047 in (inches)

9.3504 ft (feet)
Front track
The distance between the centers of the wheels on the front axle.
1482.00 mm (millimeters)

58.3465 in (inches)

4.8622 ft (feet)
Rear track
The distance between the centers of the wheels on the rear axle.
1485.00 mm (millimeters)

58.4646 in (inches)

4.8720 ft (feet)
The distance from the rear-most point to the front-most point of the vehicle.
5000.00 mm (millimeters)

196.8504 in (inches)

16.4042 ft (feet)
The width of the vehicle. Devices like door handles, mirrors and lights usually are not included in the calculation of the width. The width is measured with doors and windows closed and the wheels in a straight-ahead position.
1810.00 mm (millimeters)

71.2598 in (inches)

5.9383 ft (feet)
The distance from the floor to the top-most part of the vehicle.
1440.00 mm (millimeters)

56.6929 in (inches)

4.7244 ft (feet)
The weight of a vehicle with standard equipment and all necessary operating consumables, without passengers or cargo.
1755 kg (kilograms)

3869.11 lb (pounds)
Fuel capacity
The maximum amount of fuel that the vehicle's fuel tank can hold.
82.0 l (liters)

21.66 US gal (US gallons)

18.04 UK gal (UK gallons)
Cylinder arrangement
Information on how the cylinders in the engine are arranged. Some of the most common arrangements are: Inline, V and Boxer (opposite).
Number of cylinders
The total number of cylinders in the engine. A cylinder is the space, in which a piston moves between it's upper and lower dead point.
Valves per cylinder
Most engines have two or more valves per cylinder to control the flow of gases and fluids at proper timings. Intake valves are used to control the flow of air and fuel into each cylinder, while the exhaust valves make sure exhaust gases leave the cylinder.
The diameter of the cylinder in the engine. Most internal combustion engines have bores in the 70 mm - 105 mm range.
92.00 mm (millimeters)

3.6220 in (inches)

0.3018 ft (feet)
The length of the piston stroke within the cylinders. The distance the piston travels back-and-forth between it's upper and lower dead point.
85.00 mm (millimeters)

3.3465 in (inches)

0.2789 ft (feet)
Engine displacement
The total volume of the air/fuel mixture an engine can produce during one complete cycle. The engine displacement is the sum if the displacement of its cylinders, which includes the volume of the space between the upper and lower dead point of every cylinder.

(275.827 cu in)
~ 4.5 l (liters)

4520 cc (cubic centimeters)
Engine design
The design of the engine in regards to the number and arrangement of camshaft(s), intake and exhaust valves, etc.
single overhead camshaft (SOHC)
Compression ratio
The ratio between the largest and the smallest volume of the combustion chamber when the piston is at the top of its stroke (smallest volume) and the bottom of its stroke (largest volume).
Fuel system
The fuel system type used to store and supply fuel in the cylinder chamber.
Max power
The maximum amount of power the engine can produce.
145 kW (kilowatts)

198 ps (Pferdestärke)

195 hp (horse power)
Max power at rpm
The number of revolutions per minute at which the engine produces its maximum power.
4500 rpm (revolutions per minute)
Max torque
The maximum torque the engine can produce. Torque is the turning effect, produced when force is applied to rotate an object around an axis, fulcrum, or pivot.
358 Nm (newton meters)

264 ft-lb (foot-pounds)

36 kgm (kilogram meters)
Max torque at rpm
The number of revolutions per minute at which the engine produces its maximum torque.
3000 rpm (revolutions per minute)
Break mean effective pressure is the average pressure that acts on the piston. The higher the pressure is, the more optimized design has been achieved. BMEP takes into account engine's volume, rpm and power output.
144.40 psi (pounds per square inch)

995.60 kPa (kilopascals)

9.96 bar (bars)
Engine manufacturer
The name of the company, which has manufactured the enginge.
Engine code
The code of the engine.
M 117 E 45 / 117.981
Main bearings
The main bearings are the bearings on which the crankshaft rotates. The number of main bearings depends on the engine type.
The type of engine coolant system used to remove the heat from the engine.
The type of aspiration. Some engines are naturally aspirated, while others are turbo/supercharged.
0 - 100 km/h
The time in seconds the vehicle needs to accelerate from 0 to 100 kilometers per hour.
11.00 s (seconds)
Max speed
The maximum speed the vehicle can achieve.
200 km/h (kilometers per hour)

124.27 mph (miles per hour)
Engine location
The location of the engine in the vehicle - whether it is front mounted, middle mounted or rear mounted.
Engine alignment
The alignment/orientation of the engine in the vehicle. A transverse engine is mounted so that the engine's crankshaft axis is perpendicular to the long axis of the vehicle. Longitudinal engine is mounted so that the crankshaft is paralel to the long axis of the vehicle.
Drive system
The type of the drive system used in the vehicle.
rear wheel drive (RWD)
Information about the design of the mechanism used in the vehicle which allows it to follow the desired course. The steering mechanism aims to ensure that the wheels are pointing in the desired directions.
power assisted recirculating ball
Turns lock to lock
The number of complete rotations a steering wheel makes when turned from one extreme lock position to the other. For example, from extreme left to extreme right.
Turning circle
The smallest possible diameter of the circle described by the outside wheels when the vehicle is turning on full lock.
12.10 m (meters)

476.3780 in (inches)

39.6982 ft (feet)
Suspension front
Information about the front suspension mechanism used in the vehicle. The mechanical system that connects the wheels and axles to the chassis of the vehicle.
anti-roll bar

double wishbones

Suspension rear
Information about the rear suspension mechanism used in the vehicle. The suspension contributes to the vehicle's handling and braking, isolates the passengers from the road noise and vibrations.
anti-roll bar

Wheels front
The size/type of the front wheels. For example in "7.5J x 16", the first number represents the width in inches, the second one represents the height in inches. The letter J represents the wheel contour.
6J x 14 HB
Wheels rear
The size/type of the rear wheels used in the vehicle.
6J x 14 HB
Tyres front
The size/type of the front tyres. For example in the tyre code "225/55 R 16" the first number stands for width in mm, the second number stands for aspect ratio of height to width in %, R stands for construction type (radial) and 16 stands for wheel diameter in inches.
7.35 V 14
Tyres rear
The size/type of the rear tyres used in the vehicle.
7.35 V 14
Brakes front
The brake system used on the front wheels. In general, the brake system transmits the force from the brake pedal to the brake pads, which allows the vehicle to slow down and stop.
Brakes rear
Information about the brake system used on the rear wheels.

servo assistance
Front brake diameter
The diameter of the front brake disks. The brake disk is located between the brake pads, which when forced against both sides of the disk slow and stop the rotation of the wheel.
273.00 mm (millimeters)

10.7480 in (inches)

0.8957 ft (feet)
Rear brake diameter
The diameter of the rear brake disks.
279.00 mm (millimeters)

10.9843 in (inches)

0.9154 ft (feet)
A transmission a.k.a gearbox adapts the output of the engine to the drive wheels. The transmission can increase the torque while reducing the speed of the crankshaft or do the opposite - reduce the torque while increasing the speed of the crankshaft.
Number of gears
The number of gears in the transmision of the vehicle.
Top gear ratio
The gear ratio of the top gear. The gears ratio expresses the ratio between the number of teeth of the larger gear and the pinion, or simply put the ratio between the gears radiuses/diameters. E.g. the ratio of a gear with 24 teeth and a pinion with 13 teeth is 1.84:1.
Final drvie ratio
The final drive ratio expresses the ratio between the number of rotations of the drive shaft for one rotation of a wheel or the ratio between the number of revolutions of the pinion for one revolution of the drive axle.



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