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This article incorporates information from the equivalent article on the Japanese Wikipedia.

The EN series engine is used for kei cars sold by Subaru in Japan. It is a four cylinder, four cycle engine introduced in 1988 as a replacement for the EK23 that was used in the Subaru Rex. While others manufacturers adopted a three-cylinder engine, the Subaru-EN is a four-cylinder. The EN05 547cc 4-cylinder engine block and the cylinder was based on the EK23. Subaru did make a three cylinder engine, called the Subaru EF engine that was used in the Subaru Justy, but the EF engine is no longer in production.

The following year, 1989, the Japanese Ministry of Transport revised the standards for kei cars. This resulted in the new 660cc class series of four cylinder engines, and the EN05 had its stroke increase to produce the EN07. The increase stroke helps make up for the lack of low-speed torque-cylinder engine, which is the weakness of the other four-cylinder 660cc engines. While 4-cylinder engines are not the typical engine in kei class cars, Subaru still primarily uses 4-cylinder engines. During the 20 years of kei car development, the two- and three-cylinder engines have improved to be on par with Subaru's four-cylinder designs.[1].

There was a turbocharged version, the EK23, used in the Subaru Rex, which competed with the Daihatsu Mira and Suzuki Alto. This was replaced with a supercharger. The EN-engine turbo version is not present in the following list, only the naturally aspirated and supercharged versions. The supercharged engine was nicknamed "Clover", and Subaru now engraved the head with the clover leaf mark .

Contents

[edit] EN05

EN05 The first engine. Naturally Aspirated Carburetor is variable, EMPi is equipped with a supercharger. Inside diameter × stroke is over-square.

  • SOHC 8 valve
  • Displacement: 547cc
  • Inside diameter × stroke: 56.0 × 55.6 mm
  • Compression ratio: 10.0 (Naturally Aspirated carburetor) / 8.5 (supercharger)
  • Specifications: Naturally Aspirated carburetor 38PS / 7,500 rpm 4.5 kg m / 4,500 rpm (KH2 1986 Subaru Rex)
  • Specifications: supercharger 61PS / 6,400 rpm 7.6 kg m / 4,400 rpm (KH2 1986 Subaru Rex)

[edit] EN07A (Naturally Aspirated carburetor)

Installed in the Vivio Van.

  • SOHC 8 valve
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 10.0
  • Specification Reference: 42PS / 7,000 rpm 5.3 kg m / 4,500 rpm (KW series Subaru Vivio)

[edit] EN07C (Naturally Aspirated carburetor)

The engine is installed in the early Sambar. Compression ratio dropped slightly, and setting a low-fat rotation torque.

  • SOHC 8 valve
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 9.8
  • Specification Reference: 40PS / 6,500 rpm 5.5 kg m / 3,500 rpm (KV3 series Sambar)

[edit] EN07L (LPG carburettor version)

  • SOHC 8 valve
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 9.8

Used in
Subaru Sambar
Subaru Sambar Dias

[edit] EN07E (Naturally Aspirated EMPi)

Specifications EN07A engine carburetor engine became EMPi.

  • SOHC 8 valve
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 10.0
  • Specification Reference: 38 kW (52ps) / 7200rpm 53.9Nm (5.5 kg m) / 5600rpm (KK3 VIVIO MT version)

Used in
Subaru Rex
Subaru Vivio
Subaru Pleo

[edit] EN07F (Naturally Aspirated EMPi)

Specifications EN07C engine carburetor engine became EMPi. The rocker cover on the delivery service version had a crimson ceramic coating.

  • SOHC 8 valve
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 9.8
  • Specification Reference: 35 kW (48PS) / 6,400 rpm 58N m (5.9 kg m) / 3,200 rpm (TV1 series Sambar)

[edit] EN07S (Naturally Aspirated SPI)

Was installed in the Pleo Van EGI SPI (single point injection) engine design.

  • SOHC 8 valve
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 10.0
  • Specification Reference: 45PS / 6,400 rpm 5.7 kg m / 4,000 rpm

Subaru Pleo

[edit] EN07Y (supercharger EMPi)

The Rear engine/Rear drive version initially installed in the Sambar used a distributor, but a distributorless ignition was used from 1996 on. Like the EN07F, the high durability version used in the delivery-service version has a rocker cover decorated with a crimson ceramic coating.

  • SOHC 8 valve supercharger
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 8.3
  • Specification Reference: 55ps / 6,200 rpm 7.1 kg m / 3,800 rpm (KV4 series Sambar Touring)
43kW (58PS) / 6,000 rpm 74N m (7.5kg m) / 4,400 rpm (TV1 series Sambar Dias)

[edit] EN07W (minor change SPI)

Equipped with a CVT for Pleo, "mild change" engine power and fuel economy with both a supercharger combination of low pressure called previously. No coolers SPI interface specification.

  • SOHC 8 valve supercharger
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 8.9
  • Specification Reference: 42 kW (58PS) / 6,400 rpm 74N m (7.3 kg m) / 4,000 rpm

Subaru Pleo L (CVT transmission)

[edit] EN07U (mild change EMPi)

EMPi EN07W become the engine fitted with a small inter-cooler type of preamble. The L-type Subaru Pleo late in the generation.

  • SOHC 8 valve supercharger inter-cooler (mild change)
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 8.9
  • Specification Reference:: 44 kW (60PS) / 6,400 rpm 75N m (7.6 kg m) / 4,000 rpm

Subaru Pleo L (CVT transmission)

[edit] EN07Z (IC supercharger with EMPi)

EN exists from the time of Rex's hot model to represent the type of RM is Subaru Pleo fuel injection MPI EMPi is changing from being resetting to get power from the low rotation.

  • SOHC 8 valve supercharger intercooler
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 8.5
  • Specification Reference: 47 kW (64PS) / 6,400 rpm 84N m (8.6 kg m) / 4,400 rpm (Subaru Rex VX / Subaru Vivio GX)
64PS / 6,000 rpm 9.1kg m / 3,600 rpm (Subaru Pleo RM)

Used in
Subaru Rex VX
Subaru Vivio GX
Subaru Pleo RM

[edit] EN07D (DOHC AVCS)

R2 was used from its debut, the version with variable valve timing DOHC head. The ignition system is used direct ignition.

  • DOHC 16 valve AVCS
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Specification Reference: 40 kW (54PS) / 6,400 rpm 63N m (6.4 kg m) / 4,400 rpm (R1, R2, Stella)

Used in
Subaru R2
Subaru R1
Subaru Stella

[edit] EN07X (DOHC IC with supercharger)

VIVIO RX-R was developed at the time appeared DOHC head design. SOHC valve rocker arm to drive change, and adopt the direct push. High Lift Cam like Toyota, only the timing belt drives the exhaust camshaft, the method of driving the intake cam in syncronous from there. This, 660cc DOHC because of the often large pincer valve angle and engine that aims to compact combustion chamber by the narrow-angle slightly. Was first launched, the regular gasoline version, the RX-R Spec Subaru Vivio high-octane gasoline from the final form, appeared at the back of Stella has once again returned to the regular version. Channel is changed when appearance of the cylinder head Subaru Pleo, farthest away from the radiator was hit by an anti-heat damage to the cylinder.

  • Supercharger inter-cooler with a DOHC 16 Valve
  • Displacement: 658cc
  • Inside diameter × stroke: 56.0 × 66.8 mm
  • Compression ratio: 9.0
  • Specification Reference: 47 kW (64PS) / 7,200 rpm 106N m (9.0 kg m) / 4,000 rpm (Subaru Vivio RX-R)
47kW (64PS) / 6,000 rpm 102N m (10.5kg m) / 3,200 rpm (Subaru Pleo RS)

Used in
Subaru Vivio RX-R
Subaru Pleo RS
Subaru R2
Subaru R1
Subaru Stella

[edit] EN08

The Subaru Fiori derivative was also equipped with pink and blue pinstriping from factory and a 2 year, 50,000k warranty was offered when new. Equipped with a different engine, the Fiori had Subaru's 758 cc carburetted 4 cylinder EN08 powerplant.

[edit] External links

  1. ^ [1] (Japanese)



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