Subaru EJ Engine - Other Data

Other Data

All the EJ series share compatibility and construction similarity and are 16 valved engines. The EJ series started with the EJ15, a 1.5 liter (SOHC) and makes ~90 hp, then the EJ16, a 1.6 litre single overhead cam (SOHC). Later followed by the EJ20, a 120 hp 2.0 litre single overhead cam and the EJ22, a 135 hp 2.2 litre single overhead cam. The EJ20 turbocharged version was developed with dual overhead cams, as well as non-turbo DOHC engines and DOHC twin-turbos. The EJ18 and EJ20 were most popular in Europe and the EJ22T SOHC, mostly in the US and is known as the "bulletproof Subaru engine."

The SOHC EJ Subaru boxer engines were non-interference engines through 1996, run by a single timing belt driving both cams (both sides of the engine) and the water pump. Because they are non-interference engines, if the timing belt fails, the engine of the models up to 1996 will not be destroyed. The oil pump is driven directly from the crank shaft and the waterpump by the timing belt. All DOHC and 1997-up SOHC EJ engines are interference engines, if the timing belt fails the engine will likely be destroyed or the valves & piston will be heavily damaged.

All Subaru EJ engines have a 1-3-2-4 firing order.

Some of the 2005 and later Subaru vehicle Engines (especially the turbo charged engines) are using CAN (Controller Area Network) bus as their sole Vehicle/Vessel speed input channel, the CAN bus normally runs at 500K baud rate. When those ABS Speed signal are removed, the ECU will force the Engine running at limp home mode (engine cannot run over certain speed, maximum power and torque output are limited, and idle is not as stable as normal operation). This has posed some challenge for people who try to use the same automotive boxer 2.5L and 3.3L engines on Aerospace application, engine replacement for aged Subaru vehicles, and VW Vanagon modifications, etc.

The following table has details on a few of the commonly modified Subaru engines:

Block
EJ257 EJ255 EJ257 EJ205 EJ207
Head Type
US STI Heads US WRX Heads SpecC Heads US WRX Heads SpecC Heads
Bore (mm) 99.50 99.50 99.50 92.00 92.00
Crank Stroke (mm) 79.00 79.00 79.00 75.00 75.00
Rod Length (mm) 130.43 130.43 130.43 130.43 130.43
Piston Pin Offset (mm) .3088 .3088 .3088 .3289 .3159
Deck Height (mm) 201.00 201.00 201.00 201.00 201.00
Gasket Thickness (mm) 0.80 0.80 0.80 0.80 0.80
Head Volume (cc) 57.00 51.00 50.00 51.00 50.00
Piston Dish (cc) 22.00 22.00 22.00 12.00 8.00
Piston Deck (mm) 0.39 0.39 0.39 0.38 1.48
Total Quench Height (mm) 0.99 0.99 0.99 0.98 2.08
Total Quench Volume (cc) 7.70 7.70 7.70 8.51 13.83
Total Deck Volume
29.70 29.70 29.70 18.51 19.83
Swept Volume (cc) 614.28 614.28 614.28 498.57 498.57
Compresses Volume (cc) 86.70 80.70 79.70 89.51 89.83
Static CR :1 8.09 8.61 8.71 8.17 8.14
Rod to Stroke Ratio (na) 1.65 1.65 1.65 1.74 1.74
Engine Displacement (cc) 2457.00 2457.00 2457.00 1994.00 1994.00

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