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The EF is an
Bore x Stroke: x
Power:
* at 5000 rpm/ at 3200 rpm with single barrel Hitachi carburetor and 9.5:1
Bore x Stroke: x
Power:
* at 5200 rpm/ at 3600 rpm with two barrel Hitachi
Subaru
Dusty's Justys
The EF is an automotive engine
, there were a wide variety of propulsion systems available or potentially available for automobiles and other vehicles. Options included internal combustion engines fueled by petrol, diesel, propane, or natural gas; hybrid vehicles, plug-in ...
made by Subaru
( or ; ) is the automobile manufacturing division of Japanese transportation conglomerate Subaru Corporation (formerly known as Fuji Heavy Industries), the twenty-first largest automaker by production worldwide in 2017.
Subaru cars are ...
, introduced in 1984 for the Subaru Justy
The Subaru Justy is a subcompact hatchback that has been sold by Japanese automobile manufacturer Subaru since 1984. Subaru manufactured the Justy from 1984 to 1994; since then it has sold rebadged versions of other vehicles under the Justy namep ...
.
It is a water-cooled
Cooling tower and water discharge of a nuclear power plant
Water cooling is a method of heat removal from components and industrial equipment. Evaporative cooling using water is often more efficient than air cooling. Water is inexpensive and n ...
, straight-three, four-stroke engine
A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directi ...
with a belt-driven single overhead camshaft
A camshaft is a shaft that contains a row of pointed cams, in order to convert rotational motion to reciprocating motion. Camshafts are used in piston engines (to operate the intake and exhaust valves), mechanically controlled ignition systems ...
, and a chain-driven balance shaft
Balance shafts are used in piston engines to reduce vibration by cancelling out unbalanced dynamic forces. The counter balance shafts have eccentric weights and rotate in opposite direction to each other, which generates a net vertical force.
T ...
. It has an alloy cylinder head
In an internal combustion engine, the cylinder head (often abbreviated to simply "head") sits above the cylinders and forms the roof of the combustion chamber.
In sidevalve engines, the head is a simple sheet of metal; whereas in more modern o ...
and a closed deck iron engine block
In an internal combustion engine, the engine block is the structure which contains the cylinders and other components. In an early automotive engine, the engine block consisted of just the cylinder block, to which a separate crankcase was attac ...
with a bore spacing of . The two-cylinder EK23 engine is closely related to the EF series, sharing the same bore spacing and overall design. The export market 665 cc EK42 motor even shares the bore and stroke of the EF10.
It is the first Subaru engine to incorporate the displacement in its name, and the only iron block Subaru ever.
EF10
1.0-litre (997 cc) two valves per cylinder
Bore x Stroke: x
Power:
* at 5000 rpm/ at 3200 rpm with single barrel Hitachi carburetor and 9.5:1 compression ratio
The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values.
A fundamental specification for such engines, it is measured two ways: the stati ...
* at 6000 rpm/ at 3600 rpm with dual barrel Hitachi carburetor and 9.5:1 compression ratio
The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values.
A fundamental specification for such engines, it is measured two ways: the stati ...
Usage:
*Subaru Justy
The Subaru Justy is a subcompact hatchback that has been sold by Japanese automobile manufacturer Subaru since 1984. Subaru manufactured the Justy from 1984 to 1994; since then it has sold rebadged versions of other vehicles under the Justy namep ...
"J10" (limited to some European markets and Asia)
*Subaru Libero
The Subaru Sumo, known as the Libero in European markets except the UK, Iceland, and Sweden, and as the Domingo in the Japanese market, is a cabover microvan produced from 1983 to 1998. In Belgium, it was known as the Combi, and in Taiwan the l ...
"E10"
EF12
1.2-litre (1189 cc) three valves per cylinder
Bore x Stroke: x
Power:
* at 5200 rpm/ at 3600 rpm with two barrel Hitachi carburetor
A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meteri ...
and 9:1 compression ratio
* at 5600 rpm/ at 3600 rpm with multi-port fuel injection
Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines.
All com ...
and 9.1:1 compression ratio
Usage:
*Subaru Justy
The Subaru Justy is a subcompact hatchback that has been sold by Japanese automobile manufacturer Subaru since 1984. Subaru manufactured the Justy from 1984 to 1994; since then it has sold rebadged versions of other vehicles under the Justy namep ...
"J12"
*Subaru Libero
The Subaru Sumo, known as the Libero in European markets except the UK, Iceland, and Sweden, and as the Domingo in the Japanese market, is a cabover microvan produced from 1983 to 1998. In Belgium, it was known as the Combi, and in Taiwan the l ...
"E12"
Power:
* with multi-point fuel injection
Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines.
All com ...
Usage:
*Subaru Tutto (Taiwan)
External links
Subaru
Dusty's Justys
References
{{DEFAULTSORT:Subaru Ef Engine Subaru engines Straight-three engines