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Thread: Racing exhaust for laker 49 OMC

  1. #21
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    Maybe a bit late, but here are pictures of my Nydahl system

    Name:  ray 1.JPG
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    Name:  ray 3.JPG
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    Name:  ray2.JPG
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    Name:  ray 4.JPG
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    Name:  ray 5.JPG
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  2. #22
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    Thanks!

    I see the exhaust re-enters the tower at the bottom of the box. I suppose a hole could instead be made at one end of the box, leading to an external pipe and muffler (like the photo below).

    Jeff
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  3. #23
    2010 SRG 3 CYL CHAMPION 88workcar's Avatar
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    Tim haven't you made a few like that? With the pipe out the top?
    Helping folks out around the globe.

  4. #24
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    Quote Originally Posted by 88workcar View Post
    Tim haven't you made a few like that? With the pipe out the top?
    Yes, I've built 40 or so racing systems over the last 15 years, all with sprayed water cooling. About 12 were down outlet, the rest were top outlet. There are another 5 in production now.

    A Nydahl is on the way for duplication & improvement. These will be internally cooled for use under cowl, but can be used for racers also. All will duct exhaust under the powerhead.

    Tim

  5. #25
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    Quote Originally Posted by michael View Post
    Maybe a bit late, but here are pictures of my Nydahl system

    Name:  ray 1.JPG
Views: 1398
Size:  39.9 KB

    Name:  ray 3.JPG
Views: 1361
Size:  46.3 KB

    Name:  ray2.JPG
Views: 1307
Size:  48.8 KB

    Name:  ray 4.JPG
Views: 1331
Size:  46.8 KB

    Name:  ray 5.JPG
Views: 1410
Size:  48.5 KB
    Thanks for the excellent pics! The main change that will be made is elimination of the internal boss which interrupts pulse transfer. Not sure why Ray didn't do this originally. Perhaps he did for his own!

    Tim

  6. #26
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    Quote Originally Posted by Fastjeff57 View Post
    Thanks!

    I see the exhaust re-enters the tower at the bottom of the box. I suppose a hole could instead be made at one end of the box, leading to an external pipe and muffler (like the photo below).

    Jeff
    Hey Fast Jeff, Is that a 62 CI alky?

    Tim

  7. #27
    modifiedoutboard OUTBOARDER's Avatar
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    Default out the top on the log

    Quote Originally Posted by 88workcar View Post
    Tim haven't you made a few like that? With the pipe out the top?
    Out the top is all about the firing order and which cylinder is plugging the outher

    The nydahl log box is all about adding volume where the cross pulsing is going on so
    cylinders arent swaping flames, it lowers temp in box so squeeze wont burn pistons.
    This by no means is the only advantage or reason. Nice thing about chamber is squeeze is moved down stream to tail cone so you can sqeeze more without burning up stuff which means you can go with alot more port timing and reap more power.

    hope it helps some one out there
    ANTHONY McCULLOCH
    modifiedoutboard@hotmail.com

    Some things never change!

    They Want it cheap..............

  8. #28
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    ..."Hey Fast Jeff, Is that a 62 CI alky?"

    I wish! It's a plain old Merc 49 inch triple (the motor some people love to hate).

    Jeff

  9. #29
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    ...But I see 4 spark plugs...

  10. #30
    Sam Cullis Mark75H's Avatar
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    Yeah, I think thats Unkie's 62. Same boat he ran the Konig on if I recall. Neither lifted the sponsons off the water
    Since 1925, about 150 different racing outboards have been made.


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