Jensen 541S
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Manufacturer | Jensen Motors Limited |
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Production | 1960–1963 127 made |
Class | Sports car |
Engine | 3993 cc straight-6 5358 cc V8 |
Body | 2 door Grand tourer |
Transmission | 4-speed automatic 4-speed manual + overdrive |
Wheelbase | 105 in (2,667 mm) |
Length | 178 in (4,521 mm) |
Width | 67 in (1,702 mm) |
The Jensen 541S was Jensen Motors luxury GT model of the Jensen 541 series, from the early 1960s
Hstory
The 541S had a traditional radiator grill (rather than the flap of the 541) to accommodate the extra heat generated by a proposed new V8 engine, as well as a Salisbury limited slip differential to handle the additional torque.Being 4" wider than the 541R. This had the benefit of increasing interior space and enhancing roadholding.
In the 541S, Jensen employed their own powerful version of the Austin DS5 4 litre straight-six engine (equipped with triple SU carburetors, a high compression Weslake head, custom-made twin exhaust manifolds, and an aluminium baffled sump/oil cooler). The Jensen brothers initially tested Chrysler Hemi V8s in the 541S, as well as Richard Jensen's Jensen 541 delux, but none were employed due to supply issues. However, at Donald Healey's request, one was upgraded with a Chevrolet 327 V8.
A total of 127 cars were hand-built between 1960 and 1962 at Jensen's West Bromwich factory, most having GM-licensed Rolls-Royce hydramatic gearboxes. This was innovative at the time as performance cars mainly had manual gearboxes. It also suited the criteria of effortless speed and luxurious long distance driving Jensen set for their new car, although twenty-two were fitted with Moss manual gear boxes at the request of their prospective owners.
The Jensen 541S is also noteworthy for being the first British car to come standard with seat belts. The adoption of Dunlop disc brakes on all four wheels was another first for the 541 series. The car was equipped with a rack and pinion steering system, which provided extremely precise steering. A padded windscreen surround, fire extinguisher, and first-aid box were among the other safety features. A Motorola radio was also installed in each vehicle.
The 541 S was superseded by the Chrysler Golden Commando V8 powered Jensen CV8 model, which inherited from the 541 S the same wheelbase and track dimensions, as well as the Jensen ethos of safe, easy, comfortable and fast inter-continental travel while the groundbreaking 1966 Jensen FF used a perimeter tube style chassis first tried on the 541 series of cars.
BODY:
- coupé in plastic material
- doors: 2; seats: 4
- front seat: double.
PERFORMANCE:
- FUEL CONSUMPTION: 18.8 m imp gal, 15.7 m
- MAX SPEED; 108.0 mph, 173.9 km h;
- max speed in 1st gear: 20.0 mph, 32.2 km/h
- max speed in 2nd gear: 42.0 mph, 67.6 km/h
- max speed in 3rd qear: 70.0 mph, 112.7 km/h
- max speed in 4th gear: 108.0 mph, 173.9 km/h
- power-weight ratio: 22.0 lb/hp, 100 kg/hp
- useful load: 706 1b, 320 kg
- acceleration: standing 1/4 mile 18.8 sec—80 km(h) 9.2 sec
- speed in direct drive at 1000 rpm: 26,0 mph,—50 mph 41.9 km/h

Description
Technical
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Jensen 541S technical details and specifications (1960-1963)
ENGINE:
front 4 stroke; cylinders. 6, vertical
stroke: 3.44 x 4.37 in, 87.4 x 111.0 mm
engine capacity: 244.21 cu in, 3993 cu cm
compression ratio: 7.4 : 1
max power (SAE): 152 hp at 4100 rpm; max torque (SAE): 228 1b ft. 31,5 kgm at 2400 rpm
max number of engine rpm: 4600
specific power: 38.1 hp/l
cylinder block: cast iron
cylinder head: cast iron
crankshaft bearings: 4; valves: 2 per cylinder, overhead, with push 'rods and rockers;
camshaft: 1, side
lubrication; gear pump, full flow filter
carburation 3 LSI-J type HD 6 slanted
carburettors; fuel feed: mechanical pump
Cooling system: water
TRANSMISSION:
driving wheels: rear
gear box: automatic, hydraulic torque convertor and planetary gears with 4 ratios and reverse
3-position manual selection; gear box ratios: (l) 3.82, (II) 2.63, (III) 1.45, (IV) 1, (Rev) 4.3
gear lever: steering column
final drive: hypoid bevel
ratio: 2.93 : 1.
CHASSIS:
Tubular
front suspension: independent, wishbones, coil springs, anti-roll bar, lever dampers
rear suspension: rigid axle, semi-elliptic leafsprings, telescopic dampers.
STEERING:
rack-and-pinion
turns of steering wheel lock to lock: 2.75.
BRAKES:
disc, servo.
ELECTRICAL EQUIPMENT:
voltage: 12 V, battery: 64 Ah
ignition distributor: Lucas
headlights: 2 front and reversing.
DIMENSIONS AND WEIGHT:
wheel base: 105.00 in, 2667 mm
font track: 54.31 in. 1379 mm
rear track: 55.25 in, 1403 mm
overall length: 178.00 in, 4521 mm
overall width: 67.00 in, 1702 mmoverall height: 54.38 in, 1381 mm
ground clearance: 7.00 in, '178 mm
dry weight: 3248 1b, 1473 kg
distribution of weight: 60 % front axel '40 % rear axle
turning radius (between walls): 15.0 ft, 4.6 m
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Jensen 541S SEVICE INSTRUCTIONS (1960-1963)
Fuel: petrol, 90-95 oct
Tyre pressure (medium load): front 24 psi, 1.7 atm, rear 24 psi,
Tyres: 6.40 –15
Fuel tank capacity: 14.95 imp gal, 17.95 IJS gal, 68 1.
cooling system capacity: 12.3 imp qt, 14.8 US qt, 14 1.
lubricating system capacity: 9M imp qt. 11 US qt.
Engine sump oil: 8.5 imp qt, 10.2 US qt 9.7 1, SAE 20 (winter) 30 (summer), change every 3000 miles. 4800 km
Gearbox oil: 10.0 imp qt. 12.0 US qt. 11.4 1, change every 20000 miles,32200 km
Final drive oil: 1.5 imp qt, 1.8 US qt, 1.7 1, SAE 90, change every 10000 miles, 16100 km
Greasing: 18 points
Tappet clearances: inlet 0.012 in, O.30 mm, exhaust 0.012 in, 0.30 mm
Valve timing: (inlet) opens 50 before tdc and closes 45 after bdc, (exhaust) opens 40 opens before bdc and closes 10 after tdc