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Thread: Multiple Hybrid Equations.

  1. #1
    "FNG"
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    Multiple Hybrid Equations.

    ...
    Last edited by Alucard; 11-12-2019 at 06:20 PM.

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    "FNG"
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    I will also add this.

    EJ25D uses a 1.3mm head gasket.

    EJ251 uses a 0.6 up to 1mm head gasket.

    EJ22E uses a 1.3mm head gasket.

    EJ22T uses a 1.5mm head gasket.

    EJ222 uses a 0.8mm head gasket.

    EJ255/EJ257 uses a 0.6mm & 0.7mm head gasket.

    If I did not mention the gasket in the post, it means that the gasket MUST be made custom for that hybrid, as some coolant passages and bore diameters of certain gaskets are not up to requirement in that particular hybrid.
    Last edited by Alucard; 09-10-2015 at 01:10 PM.

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    SLi Lurker nepbug's Avatar
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    You should throw in the 255/257 head gasket too. It's a thinner MLS version of the 251, I've seen both 0.6 and 0.7mm mentioned as the thickness.

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    "FNG"
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    Ooooh, good call. I'll add in the turbo Phase 2.5 blocks as well. It may take a while to create a lot of that data, since I lost a nice chunk of my original stuff, but it'll work out. I'll input the data a bit later.

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    Last edited by Alucard; 09-29-2016 at 11:07 PM.

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    EJ22E V1-V2 heads/EJ25D V1 block = 11.4:1 with 1.3mm custom head gasket, but thinner 1mm head gasket yields 11.8:1

    That's me!

    Good thread, this will be a sticky.
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    My compression is as follows:
    Cylinder Bore: 97mm
    Piston Stroke: 75mm
    HG Diameter: 98mm
    HG Thickness: 2.032mm
    Combustion Chamber Vol: 46.6cc
    Piston Dish: -12mm
    Deck Clearance: -.0012
    Final CR: 8.4979

    I have the v2 25D heads and v1 22E block. Is my compression lower than I calculated since I'm using a 2mm headgasket?
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    Quote Originally Posted by BDAlex95 View Post
    My compression is as follows:
    Cylinder Bore: 97mm
    Piston Stroke: 75mm
    HG Diameter: 98mm
    HG Thickness: 2.032mm
    Combustion Chamber Vol: 46.6cc
    Piston Dish: -12mm
    Deck Clearance: -.0012
    Final CR: 8.4979

    I have the v2 25D heads and v1 22E block. Is my compression lower than I calculated since I'm using a 2mm headgasket?
    Yes. You're actually closer to 8.3:1.

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    SLi nOOb BDAlex95's Avatar
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    Quote Originally Posted by Alucard View Post
    Yes. You're actually closer to 8.3:1.
    What did I do wrong then? I went here http://www.csgnetwork.com/compcalc.html to calculate the compression. Are my inputs off or is the calculator off?
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    Quote Originally Posted by BDAlex95 View Post
    What did I do wrong then? I went here http://www.csgnetwork.com/compcalc.html to calculate the compression. Are my inputs off or is the calculator off?
    I just tried that same combo of parts on that same calculator and got 8.52:1, which is the same as what I came up with when using the EJ22T head gasket. So, either that calculator is being crazy, or you have gotten 22T head gaskets.

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    "FNG"
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    It's also telling me that the total displacement volume is 70cc? LOL, what? I'm getting 2217cc, which is about 135ci.

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    Quote Originally Posted by Alucard View Post
    I just tried that same combo of parts on that same calculator and got 8.52:1, which is the same as what I came up with when using the EJ22T head gasket. So, either that calculator is being crazy, or you have gotten 22T head gaskets.
    That calculator is broken then. I got the EJ22T style gasket, but got custom .08in thickness cause I remember we were trying to get as close to 8.5:1 as we could. Wish we would have caught this when I was building the motor Oh well, 8.3:1 just means more space to fill with air.
    My greatest feat with my car is the constant willingness to keep it on the road for no apparent reward.
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    t3h ub3r m3mber Thomistopheles's Avatar
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    From what I've read, EJ251 is .65mm and 255/257 is .56mm.
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    "FNG"
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    Quote Originally Posted by Thomistopheles View Post
    From what I've read, EJ251 is .65mm and 255/257 is .56mm.
    I've read the same. Subaru has changed head gasket thickness on the Phase 2 EJ25's quite a bit. I have anywhere from 0.6mm to 1mm as the EJ251/3 head gasket. The thickness availability between the EJ20's, for example, is ridiculous. The revisions will make one's head spin.

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    Quote Originally Posted by Reason View Post
    EJ22E V1-V2 heads/EJ25D V1 block = 11.4:1 with 1.3mm custom head gasket, but thinner 1mm head gasket yields 11.8:1

    That's me!

    Good thread, this will be a sticky.
    I've added it to the newly minted "threads of note" for this forum.
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    Last edited by Alucard; 09-29-2016 at 11:08 PM.

  17. #17
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    Bump thread for updated and correct compression ratio data.

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    "FNG"
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    Keep in mind the difference between Phase 1 & Phase 2 bottom end ends when it comes to piston clearance.

    Phase 1 pistons can come up above the deck anywhere from .2mm to .4 (from rod stretch or JDM pistons).

    Phase 2 pistons come up under the deck by about 0.2mm.

    Also to note:
    EJ22E head chambers - 42cc.
    EJ25D V1 head chambers - 57cc.
    EJ25D V2 head chambers - 46.6cc.
    EJ221/2/3/251/253 head chambers - 50cc.
    EJ205 (S20) head chambers - 49cc.
    EJ255 (D25) head chambers - 50cc.
    EJ257 (B25) head chambers - 57cc.
    Last edited by Alucard; 01-20-2018 at 02:06 PM.

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