engine mounting question
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engine mounting question

  1. #1
    Member jetboat ratt's Avatar
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    Default engine mounting question

    Hey guys how strong is the mounting point on the pump. I want to run just a front engine mount plate and the bell housing pump mount. Do you think it will be too much pressure on the pump? My boat came rigged with rubber car mounts that centered the weight of the motor. With the front plate only Iam afraid that when the boat hits wakes its going to put too much pressure on the pump housing. Does anyone have a used rear plate for sale for a BBF? Or will this setup work

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  3. #2
    Senior Member bajadad's Avatar
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    Can you post a pic of your setup?

  4. #3
    Classic Hotboater! GasGuzzler's Avatar
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    Sounds like a 3 point mount. It will work as designed if everything is in good shape.

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  6. #4
    Driver 78CoLeBBF's Avatar
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    a 3 point balances (kinda) the motor and uses the pump for a little extra support what is wrong with that set up or did you re-rig the boat with a different motor. I would be cautious with using the pump to support 50% of the engine weight
    Its a FORD thing chevy's arent quick enough to understand

  7. #5
    I'm No Expert Shaun's Avatar
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    How much power is this engine putting down?

    Using a front plate and no rear plate sounds like a bad idea to me, but i'm no expert.

  8. #6
    JRPM/e-PerformanceMarine Squirtin Thunder's Avatar
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    Previous to moving the engine a 1.5" forward I ran a frount mount and the 3pt bellhousing with two struts to the stringers, this gave a 5pt system and it worked very good in circle racing conditions. I will try and find a picture so you can see what I am talking about.

    BTW - I am interested in the rear mount. Please pm me the details.
    Jim & Amanda Rich
    CJ 72 & 53c

    JR Performance Motorsports

  9. #7
    Senior Member Delemorte's Avatar
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    I have jUSt tHe front plate and the three point bell houseing. Its a JF pump if that matters. Works great but its just a SBC lake boat. nothing fancy or tricked out.

    I did have another set of mounts hooked thru the stringers but i removed them as they seemed unneeded. I was advised the three point set up is fine.


    bell housing looks like this.



    Last edited by Delemorte; 05-04-2009 at 07:23 AM.
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

  10. #8
    Member jetboat ratt's Avatar
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    Thanks guys for all the input. I wanted to get rid of the stock style rubber mounts so I had bought a front plate not even thinking that 50% of the weight on the pump now is probably a bad idea. Iam running a BBF with about 600 horse. Ill try posting some pics tonight. That damn rear plate is 300.

  11. #9
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by jetboat ratt View Post
    Thanks guys for all the input. I wanted to get rid of the stock style rubber mounts so I had bought a front plate not even thinking that 50% of the weight on the pump now is probably a bad idea. Iam running a BBF with about 600 horse. Ill try posting some pics tonight. That damn rear plate is 300.
    You'll be fine with a 3 point mount system. Using a solid front mount off the front of the motor and the bellhousing mount. This setup is on thousands of jet boats out there for years of reliable service. HP is not much of a factor. Good Luck
    Boat 405.

  12. #10
    Senior Member Futs's Avatar
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    Quote Originally Posted by widowmaker View Post
    You'll be fine with a 3 point mount system. Using a solid front mount off the front of the motor and the bellhousing mount. This setup is on thousands of jet boats out there for years of reliable service. HP is not much of a factor. Good Luck
    The 3 point mount setup doent use a front plate. It uses the original motor mount location and then rests on the pump for additional support. If you move the pivot point from the center of the engine to the front of the engine you increase the weight distrabution and then the pump mount will be carrying the brunt of the load.to use the 3 point deal and make it rigid to get away from the rubber oem mounts is fine, but dont use that front plate to eliminate the motor mounts.

    Just my opinion here....

  13. #11
    Senior Member hihosilver's Avatar
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    x2 what futs said and a bbf is a lot heaver then the small block in the pics, that adds a lot of pressure on the bell housing

  14. #12
    Senior Member jetboatperformance's Avatar
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    X's 2,3,4,5 .. assuming I read this right, If you mix a solid front 4 pt style mt cast plate,and a 3 pt rear bell hsg (which uses a rubber brg cap isolator) its too much span and poor weight distribution IMO for a full grown Big block , you could however "solid" it up by putting "legs on the 3pt rear hsg and useing that set up ,similar to what Jim said (1rst pic) or simply change your stock location mid mounts to "solid" plate type now available (elimiates the engine cushion) (2nd pic) Btw glad the Transom adapt worked out call if we can help !Tom




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