West Coast Classics are proud to present this 1954 Austin-Healey
100-4 BN1 Roadster which are considered the definitive "first" of
the "Big Healeys," and celebrated for their pure design and
lightweight agility. Built September 10, 1954Chassis No.
BN1-L/219223Body No. 51642660cc inline 4-cylinder engineDual
carburetors3-speed manual gearbox with overdriveSmiths
instrumentationFactory heater optionFinished in factory-correct
Carmine Red paintBlack upholstery with Red piping and Black
carpets15-inch knock-off wire wheelsFront and rear bumper
guardsBritish Motor Industry Heritage Trust Certificate What began
as a joint venture between Donald Healey and the British Motor
Corporation (BMC) to bridge the market gap between the affordable
MG and the high-end Jaguar was destined to become one of England?s
truly iconic sport cars! The car was to be named "100" because it
was the first Healey capable of breaking the 100 mph barrier and in
1953 the 100-4 set multiple land speed and endurance records at the
Bonneville Salt Flats, cementing its performance reputation in the
American market. The BN1 models were produced between May 1953 and
August 1955 before being replaced by the BN2. Technical
Specifications Engine: 2,660 cc (2.7L) Inline 4-cylinder OHV
engine, adapted from the Austin A90. Performance: Horsepower: 90
bhp @ 4,000 rpm. Torque: 144 ft-lbs @ 2,000 rpm. Top Speed: 106 mph
(standard); up to 111 mph with the windshield folded down for
aerodynamics. Acceleration: 060 mph in approximately 11.2 seconds.
Transmission: A unique 3-speed manual with overdrive on the top two
gears. (Note: Technically a modified 4-speed where 1st was often
blocked out due to the engine?s high torque). Braking &
Suspension: Girling 11-inch drum brakes all round; independent
front suspension with coil springs and a rigid rear axle with
semi-elliptic leaf springs. Key Features Folding Windshield: One of
its most iconic features, allowing the driver to lay the screen
flat for improved aerodynamics. Construction: Aluminum and steel
body panels over a steel frame. Optional "Le Mans" Kit: Many owners
retrofitted their cars with "M" specifications, which included
larger SU H6 carburetors, high-compression pistons, and a louvered
bonnet.The next generation model was the BN-2 fitted with a 4 speed
manual transmission and still with overdrive on the top two gears.
Other features that distinguish the BN2 from the BN1 are the
slightly larger front wheel arches, different rear axle and being
the first 100 with optional two-tone paint.By January 1956
production was running at 200 cars each month and sales in
California 150 cars each month with the final BN2 built in July
1956.The high-performance 100M model was introduced in 1955 with
larger carburettors, a cold air box to increase engine air flow,
high-lift camshaft and 8.1:1 compression pistons and it produced
110 bhp at 4500 rpm. With a stiffened front suspension and the hood
louvres to distinguish it, along with a leather hood belt. Most of
the 100Ms were finished with a two-tone paint scheme, in all, only
640 100Ms were built by the factory. The 100M components (including
the high compression pistons) were also made available as the Le
Mans Engine Modification Kit, which could be retrofitted and
installed in either a BN1 or BN2 with the engine in situ, improving
the power output to approximately 100 bhp at 4500 rpm. The kit
could be ordered from BMC, allowing private owners to make their
own modifications, but these are not as valuable as any of the
original 640 factory 100M?s. Only the factory-registered chassis
identification numbers can distinguish the actual factory built
originals from retrofitted models. Finally and built primarily for
racing, the aluminium-bodied "100S" (for Sebring) model developed a
phenomenal for its day 132 bhp at 4700 rpm! Five works
development/special test cars carrying the "SPL" chassis number
prefix were developed during 1953 and 1954, with one winning its
class at Sebring in 1954 and prompting the "S" designation. Only 50
production 100S cars were made, hand built in Warwick and delivered
between February - November 1955 and carrying the "AHS" chassis
number prefix. To minimize weight and improve performance the cast
iron cylinder head was replaced by a Weslake designed aluminium
one, and the overdrive unit was not installed. Dunlop disc brakes
were used all-round, the world's first production car to feature
them both front and rear. To further lighten the vehicle, bumpers
and hood (convertible top) were eliminated, the grille reduced in
size, and the windscreen made of plastic. In all, weight was
reduced by approximately 200 lb. The majority of 100Ss were
two-toned white with Lobelia Blue sides. A handful were produced in
solid Spruce Green and red, and a single one in black.
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