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motor mounts

This is a discussion on motor mounts within the External Engine forums, part of the LSx Technical Help Section category; Solid VS. Poly VS. OEM is there any real benefits to poly or solid motor mounts over the OEM ones?...

  1. #1
    Just a farmboy V8MUSCLE's Avatar
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    2000 Pontiac Trans Am

    motor mounts

    Solid VS. Poly VS. OEM

    is there any real benefits to poly or solid motor mounts over the OEM ones?

  2. #2
    Firebird Encyclopedia 9T8W66's Avatar
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    Navy Blue Metallic
    `98 Formula M6 HdTp

    The OEM ones are weak and after awhile will deteriorate enough to allow the engine to move. This movement will produce a loss or torque and also have detrimental effects to the transmission mount. Mine were so bad that the I tore 2 1LE trans mounts in half before I replaced with all poly mounts.
    Craig
    Semi Retired Street Racer
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    1 of 1 Build Date 3/12/98

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    Life in the Fast lane sunsetorangess's Avatar
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    Met. Sunset Orange
    01 SS

    If its a DD i would stay away from solid, Poly hold up very well but transmit a bit of "road noise". Anything is better than stockers...
    J
    2001 SS, Its not the car its the Driver that matters....

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    I went with solid. I really didn't notice any change from stock driving.

  5. #5
    Just a farmboy V8MUSCLE's Avatar
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    is there any performance gain to solid or poly motor mounts?

    i read somewhere that any twisting the engine/trans does in its cradle is lost power. any truth in this?

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    Member Rk ws6's Avatar
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    Red
    2001 ws6

    i went with poly = prothanes but ive heard from a buddy with solids that theres no difference in drivability

  7. #7
    The Bandit Wesman's Avatar
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    1998 Trans Am WS6

    I went with poly mounts when I installed my LT headers. Definitely a noticeable difference in the amount of vibrations and noise transmitted into the cabin. Nothing horrible though, I could easily live with it on a daily basis.

    As for solid mounts, I really don't see a need for that unless it a track only car and you want everything as stiff as possible. They aren't going to offer any advantages in a street car, just more vibrations and noise.

  8. #8
    formally 01 T/A 0verkill's Avatar
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    "Arrest Me Red"
    2001 trans am

    i all so have poly's but couldn't tell but i put a cam and headers on at the same time so its hard to tell if any more noise from them. and yes and no with power it dosnt add any but yes it takes some from the wheels to twist the mount but not any thing to worry about on a street car. are cars can run solids just fine on the street but no real need to. imo

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    red
    2000TA

    with solids you will feel alot more vibrations ,only use them for a serious drag car.

  10. #10
    Just a farmboy V8MUSCLE's Avatar
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    when doing motor mounts do i just need the poly bushing, or do i need the whole clamshell.
    A.
    or
    B.


    if the difference is reusing the clamshell im fine with that. i just dont want to take the mount off and be like wtf i need a clamshell

  11. #11
    Member Rk ws6's Avatar
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    Red
    2001 ws6

    you will drill the old clam shell apart put new bushing in bolt it with the bolts supplied and reinstall simple as that

  12. #12
    Member joedude02's Avatar
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    Victory Red
    2002 T/A WS6 A4

    i installed spohn solids and i really like the engine response. it really gives a good throttle response to the whole car.

  13. #13
    Just a farmboy V8MUSCLE's Avatar
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    Quote Originally Posted by Rk ws6 View Post
    you will drill the old clam shell apart put new bushing in bolt it with the bolts supplied and reinstall simple as that
    thanks

  14. #14
    Member totalkos's Avatar
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    Nbm
    2000 Camaro SS

    I have solids and its barely different than stock. Dont let anybody tell you solids are for 'serious' drag cars or something. I love the way it feels.

  15. #15
    Senior Member Z28_Driver's Avatar
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    Sunset Orange Metallic
    2002 Z28 Hardtop

    Quote Originally Posted by totalkos View Post
    I have solids and its barely different than stock. Dont let anybody tell you solids are for 'serious' drag cars or something. I love the way it feels.
    2nd that. I had them in a 78 which my daily driver for about 3 years. It shakes the car a little, but not that bad.

  16. #16
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    motor mounts dont "make" any power OP..all they would do is "restore" any power lost on engine movement.

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
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    Quote Originally Posted by shady milkman View Post
    motor mounts dont "make" any power OP..all they would do is "restore" any power lost on engine movement.
    Well, that's with any bolt on...Headers, Intake, Underdrive Pulley...really doesn't "add power", just frees it up.

  18. #18
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    Quote Originally Posted by ls1camino View Post
    Well, that's with any bolt on...Headers, Intake, Underdrive Pulley...really doesn't "add power", just frees it up.
    i'd question the the intake as the intake allows more air into the engine making more power..but yea i kind of see your point

  19. #19
    cutting and welding mark21742's Avatar
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    hugger orange
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    i'm running solid mounts in my goat and have just a small vibration in gear at idle

  20. #20
    Another Slow LS1 shortdog's Avatar
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    Prothanes here, but my car does get a little vibration.

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