User Tag List

Results 1 to 2 of 2
  1. #1
    Join Date
    Jun 2017
    Location
    fife scotland
    Posts
    444
    Thanks (Given)
    86
    Thanks (Received)
    16
    Likes (Given)
    116
    Likes (Received)
    35
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Crankcase stuffing on a 40 year old V4 140 OMC

    Just doing some research on stuff the crankcase on a 40 year old Johnson 140.
    I have read that the newer engines have less need for stuffing as this has been taken into account by the manufacturing & design system used nowadays.
    The 140 comes with reed stuffers but what else can be done to de-crease the volume ?? Can the wrist pin be blanked off ??? Can the reed bed (Where it sits in the inl;ent manifold) have more work done with epoxy to help reduce the volume ????
    What other things can be done ???

    I love my Bikini

  2. #2
    Join Date
    Mar 2004
    Location
    vonore tn.
    Posts
    225
    Thanks (Given)
    0
    Thanks (Received)
    21
    Likes (Given)
    4
    Likes (Received)
    28
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    There is really nothing else that can be done to crankcase of that motor too help much. You can plane heads, . 020 or .030 to increase compression. But then you will always have to run HIGH OCTANE FUEL. Also you can remove L/U and drill 4, 1/2 inch holes in top of L/U at exhaust tract area on both sides. That will make motor breathe better, but you may piss off other boaters with extra noise.

  3. Likes spybot liked this post

Similar Threads

  1. OMC Tech: Looper porting and stuffing crankcase?? Looper gurus
    By Tinbanger1979 in forum Technical Discussion
    Replies: 14
    Last Post: 12-21-2016, 10:09 PM
  2. Crankcase stuffing wrist pins
    By Vinnie in forum Technical Discussion
    Replies: 7
    Last Post: 10-23-2010, 10:21 AM
  3. stuffing the crankcase
    By ironlake2 in forum Technical Discussion
    Replies: 20
    Last Post: 11-27-2009, 10:31 PM
  4. Crankcase stuffing mods
    By nz dave in forum Technical Discussion
    Replies: 1
    Last Post: 06-09-2009, 02:35 AM
  5. Mercury Tech: Hey T REX (crankcase stuffing)
    By Bryan Heaberlin in forum Technical Discussion
    Replies: 21
    Last Post: 12-19-2008, 11:05 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Chris Carson's Marine