From logs to Exhaust Risers
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From logs to Exhaust Risers

  1. #1
    its just another day DK_Hallet's Avatar
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    Default From logs to Exhaust Risers

    Im trying to upgrade from a Log manifold to a exhaust riser. So here is the specs .
    500 Hp BBC 454 , Panther conversion to Berk Jet, through transom just above waterline under swimstep , in a engine cover . I have 31" width of space to work with . Looking for a riser that can fit that dimension . Any and all help is welcome and appreciated

    Thanks
    chris
    Something Wicked This Way Comes

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by DK_Hallet View Post
    Im trying to upgrade from a Log manifold to a exhaust riser. So here is the specs .
    500 Hp BBC 454 , Panther conversion to Berk Jet, through transom just above waterline under swimstep , in a engine cover . I have 31" width of space to work with . Looking for a riser that can fit that dimension . Any and all help is welcome and appreciated

    Thanks
    chris
    Chris , a little clarification ("Im trying to upgrade from a Log manifold to a exhaust riser") might be helpfull ? are you going from say... Headers or OT pipes to thru hulls (rizers) ?

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    Imco is your friend, Eddie Marine makes them, Hell I might even look for a old set of Drakes then have new risers made to match your tips. But under a hatch you must be waterjacketed or your gonna burn sooner or later..lol

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    Senior Member sandeggo's Avatar
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    Quote Originally Posted by PS&B1 View Post
    Imco is your friend, Eddie Marine makes them, Hell I might even look for a old set of Drakes then have new risers made to match your tips. But under a hatch you must be waterjacketed or your gonna burn sooner or later..lol
    I'd assume that he is referring to a center riser exhaust manifold and not the old school log to twice pipes over the transom. That way he can keep the engine cover.

  7. #5
    I don't feel tardy Hallett Dave's Avatar
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    Quote Originally Posted by DK_Hallet View Post
    Im trying to upgrade from a Log manifold to a exhaust riser. So here is the specs .
    500 Hp BBC 454 , Panther conversion to Berk Jet, through transom just above waterline under swimstep , in a engine cover . I have 31" width of space to work with . Looking for a riser that can fit that dimension . Any and all help is welcome and appreciated

    Thanks
    chris
    Chris,
    Seriously, give me a call this evening.
    I recently switched over from logs to Imco Power Flows, out thru the transom with an engine cover.
    Boat = 1977 18.6 Hallett Mini Cruiser with engine hatch. I think the inside width dimension is 31" or 32".
    I can give you more detailed info over the phone. The Hallett is sitting in my garage.
    I should be home by 7:00 pm this evening so please call.
    Dave
    home# 661-723-6880
    Quote Originally Posted by Futs View Post
    Im non induced and My turd leaves pretty hard as she sits.

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    you could shell out like $3k for a set of power flows...

    i found a set of RM manifolds that were used in a sealed coolant system, but the risers were ran with salt so they were done for. picked up the whole thing for $50



    found a set of EMI (share the same casting as RM) jacketed risers for $200. slapped those on there. bought 2 sections of 4" pipe for $200, measured em up.



    welded



    polished



    done! $450.


  9. #7
    "BOATLESS" blender over's Avatar
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    Good work Ka0tyk
    Did you notice a power difference?

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    Quote Originally Posted by blender over View Post
    Good work Ka0tyk
    Did you notice a power difference?
    not yet. ive been too busy trying to get everything else ready. ive started it and the sound is a LOT different than my old logs and snails.

    just trying to give people options. id LOVE to have a set of lightning headers but realistically $4k is just NOT going to happen. =(

  11. #9
    its just another day DK_Hallet's Avatar
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    Default Much thanks

    Hey thanks for the info Dave . much appreciated. Sorry if the post was unclear. So Ill see if I can do better

    I want to replace my Logs with a center rise exhaust system that measures 32" or less from manifold to manifold. The engine has a complete cover that fits around the motor like a doghouse. I am rebuilding the motor cover but I have to stay as near as possible to the original width dimension of the cover. Because I have seats that sit at the rear corner's of the boat. Hallett Dave gave me alot of info on some IMCO 's that he installed. Anyone have any other ideas I am looking for for as much info as possible. Plus if you have a setup like I described all and any pics would really help me out on how I want to design the new motor cover. Much thanks and luv to to all my Old Skool boat brothers for anything you have .

    Chris
    Last edited by DK_Hallet; 05-21-2011 at 11:49 AM.
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