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Thread: The Phase 1 USDM Subaru EJ Engine Line.

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    The Phase 1 USDM Subaru EJ Engine Line.

    I've noticed that a lot of data has been lost so I will add information as a summary for people looking to know what they have. I am going to add engines that I have encountered and will update as I go along. There are different versions of the engines I am going to jot down, so to identify them, I will refer to them as V1, V2, and so on. They also have aluminum heads and blocks with iron liners within the cylinders.

    We will start with the EJ22 line.
    ALL EJ22's share the following:
    Forged rods and crank.
    96.9mm bore/75mm crank throw. .
    52mm rod journals.
    Single overhead cams.
    Operate on 87 octane.

    EJ22E V1:
    1990-1996.
    135hp@5600rpm/138ft-lbs@4800rpm.
    Dual exhaust ports per head.
    Hydraulic lifters.
    41cc cylinder head chambers.
    -14cc dish pistons.
    0.0012in deck clearance.
    Ribbed valve covers with "16 VALVE" on them.
    6 bolt bellhousing.
    Head gasket thickness: 1.3mm.
    Compression ratio: 9.52:1.

    EJ22E V2:
    1997-1998.
    137hp@5400rpm/145ft-lbs@4000rpm.
    Single exhaust port per head.
    Adjustable lifters.
    41cc cylinder head chambers.
    -12cc dish pistons.
    0.0012in deck clearance.
    Piston skirts coated with molybdenum.
    Ribbed valve covers with "16 VALVE" on them.
    6 bolt bellhousing.
    Head gasket thickness: 1.3mm.
    Compression ratio: 9.79:1.

    EJ221/2/3 (this is it's own engine and is an evolution of the EJ22E line):
    1999.
    142hp@5600rpm/149ft-lbs@3600rpm.
    Single exhaust port per head.
    Adjustable lifters.
    51cc cylinder head chambers.
    -3cc dish pistons.
    -0.0012in deck clearance.
    Smooth valve covers shared with EJ251/3 of the same time period.
    8 bolt bellhousing.
    Head gasket thickness: 0.8mm.
    Compression ratio: 10.2:1 (factory has this at 10:1 but this is the actual compression number, given the specs).

    Now that we are done with the EJ22, it is time to move onto the EJ25D.
    There were 3 versions of this engine produced between 1996 and 1999 and all of them shared the following:
    Forged rods and crank.
    99.5mm bore/79mm crank throw.
    1.3mm thick head gaskets.
    Dual overhead cam architecture.
    Dual exhaust ports per head.
    1996 EJ25D ran premium and was the only engine to do so. However, that was more due to ECU programming than the engine's actual need for it.

    EJ25D V1:
    1996.
    155hp@5600rpm/140ft-lbs@2800rpm.
    Hydraulic buckets.
    56cc cylinder head chambers.
    -8cc dish pistons.
    0.0012in deck clearance.
    Ribbed valve covers with "4 CAM 16 VALVE" on them.
    6 bolt bellhousing.
    48mm rod journals.
    Large intake ports.
    Compression ratio: 9.31:1.

    EJ25D V2:
    1997-1998.
    165hp@5600rpm/162ft-lbs@4400rpm.
    Solid buckets.
    46.6cc cylinder head chambers.
    -14.5cc dish pistons.
    0.0012in deck clearance.
    Smooth valve covers.
    6 bolt bellhousing.
    48mm rod journals.
    Small intake ports.
    Compression ratio: 9.65:1.

    EJ25D V3 (Final evolution):
    1999.
    165hp@5600rpm/162ft-lbs@4400rpm.
    Solid buckets.
    46.6cc cylinder head chambers.
    -14.5cc dish pistons.
    0.0012in deck clearance.
    Smooth valve covers.
    8 bolt bellhousing.
    52mm rod journals.
    Small intake ports.
    Phase 2 block and crankshaft.
    Compression ratio: 9.65:1.

    If you feel there is more to add, you are welcome to post below!
    Last edited by Alucard; 11-07-2022 at 11:28 PM.

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