Ideas on mounting engine in Tunnel jet?
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Ideas on mounting engine in Tunnel jet?

  1. #1
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    Default Ideas on mounting engine in Tunnel jet?

    Hi,

    I have a 1976 sleekcraft 19' tunnel jet boat. Solid boat with bottom freshly done by previous owner, I’m prepping top for paint now.

    Mounting the engine to the hull looks harder than I thought. Stringers are enclosed due to tunnel location on each side of stringer.

    The last engine mounts had bolts going through the hull and into the tunnel area. (now fiberglassed over when they painted the bottom. I don’t have any idea how it came from factory. I have to start fresh and looking for ideas. Engine will be mild, somewhere around 400 hp with Berkeley jet.

    Does anyone have pictures on how they mounted their engine mounts to the hull in tunnel boats, or boats with similar restrictions? suggestions, lessons learned? Special hardware you bought? Thanks!!

    Frank

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    Senior Member DuaneHTP's Avatar
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    Post a picture of the inside of your boat so we know what we are working with. It would be a big help.

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    Thanks for helping. looks like they used a mercruiser type of mount, but if I went that route, unsure how i would adapt to an automotive type side mount. Note: only about 20" between stringers
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    Last edited by Frank; 01-23-2010 at 12:22 PM.

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    Default Engine mounts

    The way they mounted the engine in this boat was by using side mounts on the engine block with a bellhousing that fit on the front of the pump. The problem is that they used lag botls to hold the side mounts to the hull. Not a good idea.Spend a little time and install a set of stringers in the engine well and this will solve your problem.

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    there was a thread about the mounts of a sleekcraft tunnel a few weeks ago but I cant remember the name. If you pm smokinlowriderss or shotgun 19 I'm sure they can help.I think they were posting pics in the thread.

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    Senior Member hihosilver's Avatar
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    I posted a pic in the other thread " question about sst"

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    Senior Member jetboatperformance's Avatar
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    Frank this is the picture (17'tunnel) I was refering to give you some ideas ,although it had small stringer we were faced with a similar situation as you and hiho have Tom


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    Senior Member hihosilver's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Frank this is the picture (17'tunnel) I was refering to give you some ideas ,although it had small stringer we were faced with a similar situation as you and hiho have Tom

    are those full length stringers and would that be enough for a 600 hp 496 chevy

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    Tough time here with a death in the family. thanks for taking the time to help!

    Very nice. Since I'm putting in a low hp engine (under 400 hp) I agree, using a plate mounted to the existing horizontal frame with multiple recessed screws in the tunnel area, spreading the load along a much longer area horizontaly then the two resessed lag bolts the factory designed should work. In my boat, the wood is solid, no rot or fiberglass damage over the years. just need to get that type of mount setup for an olds 455. should be the same angle right? Down the road I have a BBC I'll rebuild (when I can get the time) and go for much bigger power. I have zero experience driving a tunnel, I'm truly excited!
    Last edited by Frank; 01-28-2010 at 02:46 PM.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by hihosilver View Post
    are those full length stringers and would that be enough for a 600 hp 496 chevy
    Hiho thats a "Motor box set up" (1/4 stringer /not full length) and probably would be adequate for that application Tom

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    Senior Member kidd bill's Avatar
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    here is how i did mine..




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    Senior Member hihosilver's Avatar
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    how did you bolt it to the boat

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    Senior Member kidd bill's Avatar
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    Its through bolted through the top of the stringer, same holes the factory stuff used.

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