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Thread: Fast Fred's OMC Mod 50 secrets Thread #2

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    Sam Cullis Mark75H's Avatar
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    Default Fast Fred's OMC Mod 50 secrets Thread #2

    Carry on here!

    Here is a link to the beginning of the original thread: http://www.boatracingfacts.com/forum...ead.php?t=2052
    Last edited by Ron Hill; 08-09-2022 at 08:19 PM.
    Since 1925, about 150 different racing outboards have been made.


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    YARD BIRD
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    Default Yes Sir !

    [QUOTE=Mark75H;67793]Carry on here.............................................. .............................
    .................................................. .................................................. ..................................
    I find all this very interesting , as I have 4 - 49 cube motors, including a 65 short shaft, a 70 powerhead on a hustler short shaft, a 70 long shaft w/power trim and a 19 75 -75 horse Hustler short shaft , that had been raced in Sport E .

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    Team Member 850cc racer's Avatar
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    so fred i have seen these cast in liners you have spoken about, both my 814cc blocks have them,... so what 49 cuber can i get to run those mcdaniels pistons in??

    p.s. this is the best thread and site ever! i spend all day on here at work!
    Likes arizgladiator liked this post

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    FFX-61
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    it's not easy to find a press in liner Mod50 case, if ya did you most likely need sleeves,???? i have not found any,

    any way, castin works,
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    Team Member 850cc racer's Avatar
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    ahhh well i am in business then, no havent found any without castin liners..

    so to make this work with the mod50 pistons what clearances will i need etc? as you mentioned the 25hr life span will come into play...
    im tipping it more then the .008?

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    FFX-61
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    the piston +.008 be good, when She gets to temp She'll be that .004 -.0045 Mr. NERSTROM was lookin for.

    She's guna get hot on the exhaust bridges, best not to make them toothpick thin, be best to back them out of the bore.

    i'll get a fresh shot of the press in Mod50 case

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    Default straight intake??

    haa fred what advantage is the straight intake over the curved/ie stock angled intakehp or???... especially on the smaller v-rude tripple....

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    Looking at the previous photos there's 2 version of the twin barrel front half
    a straight and a slightly angled one with the shift shaft cross shaft?
    I also wonder how a custom straight in using the original 1 1/2 single barrel carbs and suitable reeds would work?

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    FFX-61
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    the reed block is the limiting Factor, the bigger or more reeds you have, the more volume you can flow, more volume = more thermo energy = more power.

    air don't like to turn, it will over run the turn and slow down.

    now that i'm at this point, i'll build the Straight In Power head and put it on the Stinger mid. the factory never offered said unit, only the 19s power head had a
    FT model.

    only scorched one set of piston to get this far. need a set of +.060

    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052

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    Quote Originally Posted by Fast Fred View Post
    the reed block is the limiting Factor, the bigger or more reeds you have, the more volume you can flow, more volume = more thermo energy = more power.

    air don't like to turn, it will over run the turn and slow down.

    now that i'm at this point, i'll build the Straight In Power head and put it on the Stinger mid. the factory never offered said unit, only the 19s power head had a
    FT model.

    only scorched one set of piston to get this far. need a set of +.060
    Is there no issue with air speed when you make it large and it slows down or does it?

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