Wrist pin oiling by using a cosworth notch

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by OwnBlock, Nov 28, 2015.

  1. OwnBlock

    OwnBlock Member

    Joined:
    Jun 12, 2006
    Messages:
    219
    Likes Received:
    2
    I have done some research regarding getting oil to the wrist pins.

    Dry sump, full scrapers, sump lower than crank etc etc.

    New pistons now have dual pin oilers in pistons.

    Aluminum Rods.

    Coated pins is a option, however at 75.00 each I'm sure that my thoughts and I see some aftermarket rod manufactures have notches on the sides for this very thing.

    My research reveals that notching a small groove ( A Cosworth Notch) in the upper b/e section of the con-rods should work.

    Has any body tried this and where would be best position: i.e. 1 notch as a small vee at the 12 o'clock so it sprays up the rod so to speak, or 2 notches say at the 10 and 2 o'clock position.

    I presume as 2 rods share the same crank pin it would be best to fit these at the side of rods at the crank radius rather than where the 2 rods are next to each other?
     
    #1
  2. aj481x

    aj481x Member

    Joined:
    Jan 27, 2004
    Messages:
    914
    Likes Received:
    8
    Do you think that current pin lube is inadequate?
     
    #2
  3. OwnBlock

    OwnBlock Member

    Joined:
    Jun 12, 2006
    Messages:
    219
    Likes Received:
    2
    Very, motor has 12 passes with rpm 8500 - everything else is perfect except pins, piston bosses and intake side of skirts.

    Pins have grooved slightly and 2 to 3 of these every time I run the engine are starting to seize on pistions.

    Skirts on intake side at bottom look like no oil at all and marking.

    My thought also is to convert my 4 stge oil pump to a single as one stage at present is being used as vacuum hooked up to the cylinder heads to evacuate.
     
    #3
  4. TOL

    TOL Active Member

    Joined:
    May 18, 2005
    Messages:
    1,087
    Likes Received:
    5

    How much vacuum are you pulling? What weight oil?
     
    #4
  5. jay70cuda

    jay70cuda Member

    Joined:
    Sep 30, 2009
    Messages:
    917
    Likes Received:
    13
    What's the piston to wall. Coated or in coated pitons?
     
    #5
  6. TOL

    TOL Active Member

    Joined:
    May 18, 2005
    Messages:
    1,087
    Likes Received:
    5
    Problems on the even bank of cylinders, or the odd bank, or both?.........
     
    #6
  7. OwnBlock

    OwnBlock Member

    Joined:
    Jun 12, 2006
    Messages:
    219
    Likes Received:
    2
    tol:dont know what vacuum.
    mostly 50wt have used 70 on occassions.
    Both banks

    Jay: will get back to you on clearance, pistons are not coated.


    Spray bar is now under construction.

    Jig is also now made to hold rods in my mill to put very shallow slots (AKA Cosworth Grooves) at b/e parallel to rod beam - I really believe this will work so proceding ahead with it - the factory years ago wern't wrong when they did this to rods to get oil to the pin and up into the bore.

    Years ago I bought and successfully ran a set of cunningham steel con rods - i ran a hacksaw oil groove slot in rods at cap part line - grooved with die grinder around edge of bolt hole, filed vee in the upper bearing at crush point - this shot oil to opposing cyl.
     
    #7
    Last edited: Dec 1, 2015
  8. Mark Leigh

    Mark Leigh Member

    Joined:
    Mar 9, 2010
    Messages:
    417
    Likes Received:
    2
    If this is a hemi ? What is your rod side clearance ? Oil pressure at max RPM ?
     
    #8
  9. TOL

    TOL Active Member

    Joined:
    May 18, 2005
    Messages:
    1,087
    Likes Received:
    5
    Is piston wall and piston pin lube typically a problem these days in blown alcohol, or is there perhaps an issue here that is being overlooked? I don't seem to recall such issues being problematic in current times?
     
    #9
  10. OwnBlock

    OwnBlock Member

    Joined:
    Jun 12, 2006
    Messages:
    219
    Likes Received:
    2
    I read recently pro stock suffered this very problem - coated pins I believe doubled the life of the pistons. I want to overcome the issue and not put a band aid in there.

    Viewed a USA built and prepped BBC motor out of a boat 2 nights ago, sump is very deep - inside the sump is a very simple spray bar system. The more I look into this the more I'm hearing dry sumped motors have a pin oiling issue if nothing done.
     
    #10
  11. TOL

    TOL Active Member

    Joined:
    May 18, 2005
    Messages:
    1,087
    Likes Received:
    5

    Do you happen to have a picture of the spray bar system?
     
    #11
  12. OwnBlock

    OwnBlock Member

    Joined:
    Jun 12, 2006
    Messages:
    219
    Likes Received:
    2
    pm me your email
     
    #12
  13. TOL

    TOL Active Member

    Joined:
    May 18, 2005
    Messages:
    1,087
    Likes Received:
    5
    Sent........
     
    #13
  14. youngtuner

    youngtuner Member

    Joined:
    Mar 24, 2004
    Messages:
    953
    Likes Received:
    4
    I have had pistons made that take oil from the oil ring lands and force them into the wrist pin lands. Solves the oil problem where the wrist pin and buttons all interact with the piston. Food for thought
     
    #14
  15. TOL

    TOL Active Member

    Joined:
    May 18, 2005
    Messages:
    1,087
    Likes Received:
    5
    Two questions......

    Do people ever EDM a small passage through the rod beam from the big end of the rod to the small end of the rod, to pressure feed oil to the pin, like is sometimes done in endurance motors?

    What about piston squirters, like what the NASCAR guys do?
     
    #15
  16. SoDak

    SoDak Active Member

    Joined:
    Dec 29, 2006
    Messages:
    1,509
    Likes Received:
    2
    Whats the "oil problem", do the wrist pins turn blue?
     
    #16
  17. OwnBlock

    OwnBlock Member

    Joined:
    Jun 12, 2006
    Messages:
    219
    Likes Received:
    2
    youngtuner: my new pistons have arrived I had to stipulate i wanted oil hole to pin boss - je advised they dont need them, i insisted - they did it - pin is in oil groove. current pins appear like they just come off the lathe with little tiny grooves - keep putting in my lathe and diamond file on them.

    plus they quite sharp where they meet the buttons

    a previous set from wiesco was all done as std - i see je and wiesco are now one.

    tol: yes a usa firm does drill them for approx 50.00 per rod.

    no they dont turn blue - just dry looking like no oil same as intake side of skirt
     
    #17
  18. TOL

    TOL Active Member

    Joined:
    May 18, 2005
    Messages:
    1,087
    Likes Received:
    5
    How do things look around the small end rod/pin joint?
     
    #18
  19. OwnBlock

    OwnBlock Member

    Joined:
    Jun 12, 2006
    Messages:
    219
    Likes Received:
    2
    rod is great. talked to firm that ordered pistions, and researched this. pins likely flexing / bending - 1.094 as supplied with original pistons - for a n/a application - now I have trend H 13
     
    #19

Share This Page