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

  1. #61
    FFX-61
    Join Date
    Aug 2005
    Location
    Stellwagan Ledges
    Posts
    1,389
    Post Thanks / Like

    Default

    on the yamaha, i've recut the head deck to even it up, number 3 allways comes up a bit short, was thinkin cuzz of the injector pump space the hole did not charge as well like 1 and 2.

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

  2. #62
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    780
    Post Thanks / Like

    Default

    Fred
    If you burn a piston in the Yam which one goes first?

  3. #63
    Team Member
    Join Date
    Nov 2008
    Location
    Horseshoe Bend, ID
    Posts
    657
    Post Thanks / Like

    Default Bolt on acceleration

    OK you OMC triple buffs, I've got an extra Mod-50 flywheel available for sale. Anyone interested send a message.

    Tim
    Likes TroyWoodF1 liked this post

  4. #64
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    780
    Post Thanks / Like

    Default

    Tim
    Is that the same as a M31 flexplate?
    How many different race flywheels was there for the 49 ci?
    Thanks
    Powerabout

  5. #65
    FFX-61
    Join Date
    Aug 2005
    Location
    Stellwagan Ledges
    Posts
    1,389
    Post Thanks / Like

    Default

    number one allways burnt down on me, i was allways pushin timin.

    only one 3 cyl race flywheel, the mod50 flex wheel.

    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052
    Likes TroyWoodF1 liked this post

  6. #66
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    780
    Post Thanks / Like

    Question

    Where do you get the long rod with the larger size small end?

    and
    Anyone know what the merc rod used was?

    and
    Best option for new pistons

    I am trying to find out what you can build with new parts and what you need to scrounge
    thanks

  7. #67
    FFX-61
    Join Date
    Aug 2005
    Location
    Stellwagan Ledges
    Posts
    1,389
    Post Thanks / Like

    Default

    Sea-way gots mod50 rods.

    Sea-way or McDaniel on pistons, two ring pistons last longer.

    ? not sure what rods, and or if it worked.

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

  8. #68
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    780
    Post Thanks / Like

    Question

    Thanks Fred

    In a previous post you posted a port map suited to tunnel or hydro's saying that it was a bit high for a V bottom.
    Was that map for the short or long rod set up?

    Regards
    Powerabout

  9. #69
    FFX-61
    Join Date
    Aug 2005
    Location
    Stellwagan Ledges
    Posts
    1,389
    Post Thanks / Like

    Default

    OMC 49cuber intake ports are in a high state of tune, for the most part it's finger ports on the intake side.

    the map is the same for ether rod. my tunnel is DEEP, not much help from the air
    to get on plain, she pulls the hull right on plain, witch is like two Vee hulls.

    you can get what ever you need, even a new 31m

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

  10. #70
    Team Member
    Join Date
    Sep 2008
    Location
    Singapore/Melbourne/Italy
    Posts
    780
    Post Thanks / Like

    Thumbs up 70 75 differences...the data

    Here's a few bits of data
    Do we assume all 75's have raised and chamfered exhaust ports and bigger carbs?
    Enjoy
    Powerabout
    Rev 2 added inner exh plate
    Attached Files Attached Files
    Last edited by Powerabout; 04-28-2009 at 12:28 AM. Reason: supdated spreadsheet

Thread Information

Users Browsing this Thread

There are currently 4 users browsing this thread. (0 members and 4 guests)

Similar Threads

  1. An Amazing Story: Cover Thread
    By Mark75H in forum Outboard Racing History
    Replies: 0
    Last Post: 10-13-2008, 05:48 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •