1955 Austin-Healey 100S

In 1955 the Donald Healey Motor Co. decided to build a competition version of the 100 known as the 100S. These came after a series of Special Test Cars that experimented with the final design which finally appeared at the 1955 Sebring 12 Hours.

Changes from the standard model included a new Weslake alloy cylinder head with larger valves, a high-lift camshaft, nitride-hardened steel crankshaft and forged-steel connecting rods which helped the model achieve 132 bhp.

The 100S was also one of the first cars to be equipped with the Dunlop disc brakes.

Additional features included a 20-gallon fuel tank, a stonger chassis and Lucas Le Mans 24 Hour headlights.

Externally the 100S was distinguished by its smaller front grill, external fuel filler, louvered hood and perspex front window.

On track the Healey achieved some remarkable results. Stirling Moss and Lance Macklin placed 6th at the 1955 Sebring 12-Hours which was the model’s debuting race. Later the car would appear at all the famous races including the 1955 24 Hours of Le Mans, 1955 Carrera Panamericana, 1955 Nassau Speed Weeks and Mille Miglia.

Feature Car AHS3804

Our feature car is a very special Healey that began life as a works competition test car known as SPL224B. In its original configuration it raced the 1953 Mille Miglia, 1953 24 Hours of Le Mans, 1953 Goodwood 9 Hours, 1954 Mille Miglia, 1954 Sebring 12 Hours, 1954 Tour de France and 1954 Alpine rally.

In late 1954, the car was converted with 100S bodywork and acquired the license OON440 from the Carrera Panamercana car. Painted red it raced in the 1955 Mille Miglia as number 700. After the race it was shipped to Ed Bussey who was the car’s intended owner. He raced it twice more at the 1956 and 1957 Sebring races as well as a few SCCA races.

By 1961 it was acquired by Bobby Berger of Dallas, Texas who carefully had it stored for 39 years. The result is that the famous Mille Miglia 100S was remarkably preserved. Within the chips of paint there are three coats of red which reveal works Healey green as the original top coat.

Auction Sales History

In Detail

submitted byRichard Owen
typeRacing Car
built atLongbridge, Birmingham, England
production50
engineA90 Inline-4
positionFront, Longitudinal
aspirationNatural
block materialCast Iron
valvetrainOHV 2 Valves / Cyl
fuel feedTwin SU Carburetors
displacement2600 cc / 158.7 in³
bore87.3 mm / 3.44 in
stroke110 mm / 4.33 in
power98.4 kw / 132.0 bhp @ 4750 rpm
specific output50.77 bhp per litre
torque227.78 nm / 168.0 ft lbs @ 2500 rpm
body / frameAluminum Body over Steel Frame
driven wheelsRWD
wheel typeSteel Wire Spoke
front tires5.90-15
rear tires5.90-15
front brakesDunlop Discs
rear brakesDunlop Discs
f suspensionDouble Wishbones w/Coil Springs, Hydrualic Shock Absorbers
r suspensionLive Axle w/Semi-Elliptical Leaf Springs, Hydrualic Shock Absorbers
dry weight908 kg / 2000 lbs
wheelbase2286 mm / 90.0 in
front track1286 mm / 50.6 in
rear track1289 mm / 50.7 in
length3759 mm / 148.0 in
width1537 mm / 60.5 in
transmission4-Speed Manual with Overdrive
tran clutchSingle-Plate Borg & Beck
final drive2.92:1
top speed~190 kph / 118.1 mph
0 – 60 mph~7.8 seconds
0 – 100 mph~24.4 seconds
0 – 1/4 mile~16.1 seconds

Auction Sales History

1955 Austin-Healey 100S

1955 Austin-Healey 100S AHS-3707 – did not sell for €850,000 One of only 39 surviving examples of the 50 built. Early Southern California provenance. Documented, matching numbers, and highly original. Well-kept professional restoration by Hill & Vaughn, with lovely patina. Mille Miglia Storica, Le Mans Classic, Goodwood, and Colorado Grand eligible.
Auction Source: Villa Erba 2015 by RM Sotheby
1955 Austin-Healey 100S

1955 Austin-Healey 100S AHS-3504 – sold for $1,012,000 The first chassis of just fifty built of this special alloy-bodied racing model. The fourth car to be finished; custom-ordered for actor Jackie Cooper. Delivered to Cooper at the 1955 12 Hours of Sebring race. Driven by Cooper, with co-driver Roy Jackson-Moore. The only 100S delivered in Spruce Green.
Auction Source: 2015 Amelia Island by RM Sotheby’s

1955 Austin-Healey 100S

1955 Austin-Healey 100S

The 100S presented here, AHS 3707, was among a select group that was originally delivered to the West Coast of the US, a hotbed of sports car racing during the 1950s. Finished in the classic white over Lobelia Blue livery, this factory-built racer was originally shipped on April 21, 1955, to Gough Industries in Los Angeles. According to various sources, Gough Industries ordered seven 100S models in total, with six delivered in sequence, 3707–3801, to be sold to ambitious local drivers.

Auction Source: 2011 Amelia Island Auction by Gooding & Company