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  1. #1
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    Multiple Hybrid Equations.

    Let's fix this and repost the data so that the readers of this forum can have what they need to utilize what they have or want to build.

    We will start with applications for the naturally aspirated 2.5.

    EJ25E Version 1:
    1990-1998 EJ22E heads on 1997-1999 EJ25D w/Cometic hybrid head gaskets.
    Chamber cc: 41.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -14.5cc.
    Deck clearance: 0.3mm.
    Compression ratio: 10.4:1.
    Compression ratio: 10.7:1 w/1mm head gaskets

    EJ25E Version 2:
    1990-1998 EJ22E heads on 1996 EJ25D block w/Cometic hybrid head gaskets.
    Chamber cc: 41.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -8cc.
    Deck clearance: 0.3mm.
    Compression ratio: 11.4;1
    Compression ratio: 11.9:1 w/1mm head gasket.

    EJ25E Version 3:
    1990-1998 EJ22E heads on 1999-2004 EJ251 w/custom Cometic head gaskets.
    Chamber cc: 41cc.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -6cc.
    Deck clearance: -0.3mm
    Compression ratio: 11.3:1
    Compression ratio: 11.7:1 w/1mm head gaskets.
    Compression ratio: 12:1 w/0.8mm head gaskets.
    Compression ratio: 12.4:1 w/0.6mm head gaskets.
    (The EJ25E is the hybrid people formerly knew as "Frankenmotor.")

    This kicks off the DOHC versions.
    EJ25D Version 1:
    1996 HLA EJ25D heads on 1997-1999 EJ25D block/OEM EJ25D head gasket.
    Chamber cc: 56cc.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -14.5cc.
    Deck clearance: 0.3mm.
    Compression ratio: 8.6:1.
    Compression ratio: 8.9:1 w/1mm head gasket.

    EJ25D Version 2:
    1997-1999 EJ25D heads on 1996 EJ25D block w/OEM EJ25D head gasket.
    Chamber cc: 46.6cc.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -8cc.
    Deck clearance: 0.3mm.
    Compression ratio: 10.5:1
    Compression ratio: 10.9:1 w/1mm head gasket.

    EJ25D Version 3:
    1996 EJ25D heads on 1999-2004 EJ251 w/OEM EJ25D head gaskets.
    Chamber cc: 56cc.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -6cc.
    Deck clearance: -0.3mm.
    Compression ratio: 9.5:1
    Compression ratio: 9.8:1 w/1mm head gasket.
    Compression ratio: 10:1 w/0.8mm head gasket.
    Compression ratio: 10.2:1 w/0.6mm head gasket.

    EJ25D Version 4:
    1997-1999 EJ25D heads on 1999-2004 EJ251 w/OEM EJ25D head gaskets.
    Chamber cc: 46.6cc.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -6cc.
    Deck clearance: -0.3mm.
    Compression ratio: 10.75:1
    Compression ratio: 11.1:1 w/1mm head gasket.
    Compression ratio: 11.4:1 w/0.8mm head gasket.
    Compression ratio: 11.8:1 w/0.6mm head gasket.

    EJ25D Version 5:
    1997-1999 EJ25D heads on 1999-2004 EJ254 w/OEM EJ25D head gaskets.
    Chamber cc: 46.6cc.
    Bore: 99.5mm.
    Stroke: 79mm.
    Head gasket thickness: 1.3mm.
    Piston cc: -3cc.
    Compression ratio: 11.2:1
    Compression ratio: 11.7:1 w/1mm head gasket.
    Compression ratio: 12:1 w/0.8mm head gasket.
    Compression ratio: 12.3:1 w/0.6mm head gasket.

    That concludes the 2.5 N/A hybrids.
    Last edited by Alucard; 11-21-2022 at 09:22 PM.

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