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  1. #16
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    exhaust cover
    Attached Thumbnails Attached Thumbnails 31 m EFi.jpg  

  2. #17
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    Quote Originally Posted by FMP View Post
    How about the triple Stinger exhaust, any pics?

    The transition from ex port to manifold passage is where gains are made. The manifold itself isn't chosen for only purpose of spent gases having a way out, it's to improve the pairing and scavenging signals timing for the small 49 ci consumer motor. The manifold likely enable more ex duration to helping the little motor on the high end.
    stock and stinger is the same, there were very little changes over the years for production stuff once they went to 70hp
    mostly trying to get more low end torque

  3. #18
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    The manifold runners longer port to port length would help the low side skiing even with more duration for upper HP. That's the advantage over open chest port to port distances.

  4. #19
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    Chaz, FMP is right- I'd hoped for inputs and contributions from members on innovations they'd seen when building outboards for the last 100 years.

    You have exceeded all of my expectations......I did not know anyone would be so quick to criticize, ridicule, and pee on my leg as yourself. I don't know you and I'm sorry that my thread offended you and your personal, philosophical convictions. If you don't like this, please refrain and let those of us who do share our meager, unworthy ideas without harassment. Gordon

  5. #20
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    Quote Originally Posted by powerabout View Post
    31m exhaust
    How about the piece between block and cover?

  6. #21
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    I'm not offended. I didn't put and keep WW1 technology in production well into the 1970's .


    I mean it's not like I said Iacocca melted down all the old West Bends to build the K car to keep the whole thing from collapsing ..

    I mentioned in the other thread I thought the best of the worst was the bubble back OMC where the log starts small and then grows tall to deal with the increased volume as it picks up additional cylinders along the way.
    Having welded twice as many outboard blocks back together, resleeved and put back in service this year alone than you and Frank have owned put together in your life times. I can say with accuracy, 99% of those failures occurred on the bottom two cylinders and as a direct result from " the invention" IE the bottom two cylinders ingesting raw flame in thru the ex port .. Go head Wilbert, fatten them top holes up real good~N~safe .. ! ......... > Keep the pilot light lit

    It hasn't been a 100 years but after I put the log where I wanted it on my big bore 3.0L Merc blocks. I had dies built $750.00 dollars to stamp out my own base gaskets. Of course you have to dedicate a $1200.00 engine adapter plate to the project as well. But even my buddy FuMP could tell @ a glance .. that's where the factory should have put it ..
    Am I satisfied 100% with the outcome ..? Of course not .. it's why I get out of bed in the morning. I try my best to approach my work with an open mind. I learned a long time ago, to only marry my wife, otherwise I might find myself touting 50 year old hardware or trick of the week as being a newsworthy current event ...
    Speaking of keeping with the times.. what kind of O2 numbers you seeing " while the invention" is working within its peak efficiency .. ???



    While the exhaust isn't mine, I did manage to shave 85+ pounds off of a 2.5L 300 Drag from the transom bracket to between the powerhead and lower unit .. And no FuMPy won't find the directions via Google ..



    A little educational video .. there are two boats with "tuned exhaust" everyone else is in the way ... Can you pick the two boats with tuned exhaust .. I know ya can

    <font face="Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif">

  7. #22
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    Moved the log , to where and to what outcome? Perhaps you should show and tell what the chests have evolved into. As others have said , you're a good welder.
    The OMC let's see what you think of the interior layout, closed deck.
    Last edited by FMP; 08-22-2019 at 11:58 PM.

  8. #23
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    More info on the 3.0 ex plate please

  9. #24
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  10. #25
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    Gordon, first I see your new here. Welcome aboard ..

    Frank is warming up for winter .. and I always willing to help him out ..

    I'm sure there is a Warm and Fuzzy thread in the Emotional Section :

    This is the Tech Section : So when you ask ....

    Outboard Exhaust Tuning - Who Did It Best?

    Unless you plan to give everyone a participation ribbon and call it a draw, your going to hafta be objective and start whittlin down the field until there is just one that is "Best". My apologies if your favorite took an early exit. Don't feel bad .. my favorite ain't too far ahead

    FuMP .. I have a better idea. Tell us what you would do with this mess



    N.J.
    The adapter plate has the inside radius covered because you don't need to see it.
    There is a O2 sensor just below #6 , because .. I need to not only see it, but data log it.
    The green tint in the runners goes from the piston crowns to the tuner tips.


  11. #26
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    so there is more HP potential from the omc 3.0 than a Merc 3.0

  12. #27
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    you need to crack an egg to make an omelette

  13. #28
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    Quote Originally Posted by powerabout View Post
    so there is more HP potential from the omc 3.0 than a Merc 3.0
    I was thinkin more along the lines of the 3.3 and 3.4 blocks. They'realready done, it takes quite a bit of effort to turn a 3.0L Merc into a 3.4~ 3.6 deal. But that's the direct way to serious steam ..

    FMP
    you need to crack an egg to make an omelette


    Chaz = Yup, that what I thought ....

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  15. #29
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    JMO.....A Mk 20h.... cornpopper......Eh? wadda say?

  16. #30
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    I believe Chaz is saying he did/does it best. Which is the subject of the thread. All the other contenders left S&F years ago but you can see many of them in just a few weeks at Jasper.

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