Subaru 1000 

 1966 to 1969

Production	1966–1969
Predecessor	Subaru 1500
Successor	Subaru Leone
Body style	2-door sedan 4-door sedan 2- and four-door station wagon
Layout	FF layout
Engine	977 cc F4, 55 hp (41 kW)
Wheelbase	2,420 mm (95.3 in)
Length	3,930 mm (154.7 in)
Width	1,480 mm (58.3 in)
Height	1,390 mm (54.7 in)
Curb weight	670–695 kg (1,500–1,530 lb)

It was the first production Subaru to use a boxer engine.

In 1960, Subaru management decided to introduce a successor to the prototype Subaru 1500 with a new code name "A-5" with a four-cycle air-cooled horizontally opposed four-cylinder engine displacing 1500 cc, driving the front wheels in a compact car platform. It was to have a double wishbone front suspension. Due to FHI's limited resources, the car wasn't produced. The Subaru 360 was selling at the time but Subaru wanted a car that could comfortably carry four passengers without a cramped compartment, that would appear to be an alternative to the Toyota Publica, the Datsun 110/210, the Hino Contessa, and the Mitsubishi Colt 600. Subaru also wanted to reduce engine noise by placing the engine up front and improve interior space by implementing front wheel drive, thereby eliminating a centrally mounted drive shaft powering the rear wheels, and utilizing an independent suspension at all four wheels. The only other Japanese company to use an air-cooled, horizontally opposed engine at the time was in the Publica, and the Toyota U engine.

In 1963, Subaru tried again, with a new project code "A-4", with a smaller 923 cc engine, front wheel drive, and an overall length of 3,885 mm (153.0 in), a wheelbase of 2,400 mm (94 in), a front wheel width of 1,230 mm (48 in) and a rear wheel width of 1,220 mm (48 in), weighing 500 kg (1,100 lb). It made it towards production status and was changed to production code "A-63" and was eventually introduced as the Subaru 1000. To address space efficiency and a quiet operation with minimal vibration, the engine was developed as a water-cooled engine instead of the original intent of air-cooled in the "A-5" concept.

The Subaru 1000 was formally introduced on October 21, 1965 at the Hilton Hotel Tokyo, now known as the Hotel Tokyu Capitol. It was shown at the 12th Tokyo Motor Show Sunday October 29 later that year. It was available for purchase May 14, 1966 with a national release in Japan in October 1966. Its model code was A522. The two-door sedan, model A512 was introduced February 15, 1967, with a four-door van released September 14, 1967.

These cars featured a unique water-cooled, horizontally opposed four-cylinder engine, with overhead valves operated by pushrods. Subaru engineers examined Porsche, Volkswagen and even Chevrolet Corvair and thought it would be nice if this type of engine is combined with front wheel drive system. The neck in proceeding the mechanism was the vibrations from universal joints, but in collaboration with the bearing maker Toyo Bearing (now known as NTN), the epoch-making "double offset joint" was invented. Modern Subarus still make use of horizontally opposed four-cylinder engines, albeit of a much greater capacity and with more modern overhead-cam-driven valves.

As was typical of early front wheel drive cars, the 1000 featured inboard drum brakes up front to reduce unsprung suspension weight and an easier implementation of an independent front suspension (but atypically Subaru would retain this unusual design into the seventies). Other unique features of the 1000 were a lack of a heater core, the heating system took its warmth directly from the radiator, and a hybrid suspension system that used torsion bars in combination with coil springs (much like the front suspension of the Subaru 360). The 1000 was superseded by the 1100 (also known as the Subaru FF-1 Star in the United States and in other export markets) at the start of the seventies.

By March 1969, Subaru had produced over 4,000 units as an alternative to the Toyota Corolla series KE10 (introduced in 1966), and the Nissan Sunny series B10.

Engine

Subaru EA-52 Engine 1.0L OHV Water-Cooled Flat-4

• Displacement: 72 mm (2.8 in) x 60 mm (2.4 in), 977.2 cc
• 9:1 compression ratio and two-barrel carburetor
• Engine capacity: 59.62 cu in, 977 cu cm
• Fuel consumption: 56.5 mlimp gal, 47 mlUS
• Max speed: 83.9 mph, 135 km/h
• max power (SAE): 55 hp at 6,000 rpm
• max torque (SAE): 56 1b ft, 7.8 kg m at 3,200 rpm
• max engine rpm: 6,000
• specific power: 56.3 hp/l
• power-weight ratio: 27.6 lb/hp, 12.5 kg/hp
• acceleration: standing 1/4 mile 19.9 sec

Transmission

Four-speed manual, front-wheel drive

• Gear ratios: 1st 4.000 2nd 2.235 3rd 1.543 4th 1.033, Rev 4.100 Final 4.125