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Technical Y block priority oiling modification

Discussion in 'The Hokey Ass Message Board' started by Roothawg, May 20, 2018.

  1. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,915

    Roothawg
    Member

  2. ottoman
    Joined: May 4, 2008
    Posts: 284

    ottoman
    Member
    from Wisconsin

    The biggest problem with the stock oiling system was sludge build up from the oils of the day. On a fresh build the stock system will work fine when used with modern oils... that's stock to mild builds... I have no experience with race Y blocks so I cant speak about those.
     
  3. Blue One
    Joined: Feb 6, 2010
    Posts: 10,581

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Tim McMaster has a simpler solution to that problem, pressurized rocker arms.


     
  4. Its a really thin cam bearing. and if its a little bit worn. That lets the oil leak internally. Expecially if the passage is a bit plugged by sludge. Path of least resistance type of deal.
     
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  5. So all the conversion to pressurized rockers arms consist of is doing away with the factory oil return tube? that will not cure the problem of not enough oil reaching the rockers. We have been mashing those steel tubes flat for decades. The first article with the braided plumbing in the lifter galley that would address the delivery of oil to the rockers.
     
  6. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,914

    sunbeam
    Member

    That system still does not address the transfur slot in the head surface. A lot of heads get milled which makes it worse. Did this guy look at the oil passages in a Y block ? The oil from the filter hits the passage that feeds the mains and cam bearings even with the 4th main oil look at the filter location. So taking oil from the 5th main is no closer than the stock 3rd main location.
     
    Last edited: May 20, 2018
  7. dan griffin
    Joined: Dec 25, 2009
    Posts: 471

    dan griffin
    Member

    Oldsmobile rockers were also short of oil. I use Chevy lifters and 67 Cad push rods. You have to clean up the oil return holes in the head and block.
     
    jebbesen likes this.
  8. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,187

    302GMC
    Member
    from Idaho

    Overhead oilers are traditional on the Y motor ...
     
    Old wolf likes this.
  9. One thing will not fix the problem. The cam bearings have to be new and properly aligned. The oil feed hole in the block and head have to be cleaned (pipe cleaner and solvent) and the mating openings chamfered. Next the rocker arms need to be new or near new with no grooving. The rocker arms as well. Make sure they are on the shaft the correct way. Next the shafts need to plugged. I chamfered the oil holes in the shaft for the rockers. New oil pump and thin shim under the pressure spring and all was good. I also used light weight pushrods and the supercharger camshaft. 272+ .040, 2x4 with autolites
     
    Truck64 and Old wolf like this.
  10. I always enlarged that slot and radused the sides of the oil passages so as to lessen the dogleg effects. However I think the internal leakage coming from around the narrow cam bearings is a big part of the trouble. The later camshafts had a groove turned in the center of the journal to help with the oil delevery
     
    Hnstray likes this.
  11. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,914

    sunbeam
    Member

    The best fix is to cut a grove behind the cam bearing like the FE has
     
    Roothawg likes this.
  12. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,915

    Roothawg
    Member

    What transfer slot are you referring to? Anyone have a picture?
     
  13. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,914

    sunbeam
    Member

  14. hotrodyankee
    Joined: Jun 27, 2016
    Posts: 304

    hotrodyankee
    Member

    That engine that hot rod did the article for is my friends 50' ford. Keith dorton built it its a real sweet engine. They are building another one right now for his 55' ford convert.
     
    Roothawg likes this.

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