King Bearings

Discussion in 'PSI Superchargers Tech Questions' started by altered boy, Jan 4, 2006.

  1. altered boy

    altered boy Outlaw Altered

    Joined:
    Aug 4, 2003
    Messages:
    418
    Likes Received:
    3
    on a blown chevy rotating assembly using king bearings what are the advantages of full, 3/4 and 1/2 groove main bearings?
     
    #1
    altered boy, Jan 4, 2006
  2. Mike Canter

    Mike Canter Top Dragster
    Staff Member

    Joined:
    Mar 10, 2004
    Messages:
    4,630
    Likes Received:
    189
    More oil to the main bearings. The groove allows the oil to flow better to the lower half of the bearing. The groove also acts as a storage area for the oil. The disadvantage of a full circle groove is less bearing area. It is a balance between bearing surface area and oil flow and this can be different from one motor to another and the way you run the motor. The only sure way to know is to try them and take them out on a routine bases and check them.
     
    #2
    Mike Canter, Jan 5, 2006
  3. Danny Humphreys

    Danny Humphreys Member

    Joined:
    Aug 4, 2003
    Messages:
    489
    Likes Received:
    0
    kings

    I've had great success with the 3/4 groove in my blown kb olds/chevy. They still look like new after 75 passes.
     
    #3
    Danny Humphreys, Jan 5, 2006
  4. altered boy

    altered boy Outlaw Altered

    Joined:
    Aug 4, 2003
    Messages:
    418
    Likes Received:
    3
    thanks danny... you running a blown alcohol deal? how hard are you leaning on yours? thanks for the replys guys... any others want to chime in?
     
    #4
    altered boy, Jan 5, 2006
  5. shawn davis

    shawn davis Member

    Joined:
    Feb 27, 2004
    Messages:
    658
    Likes Received:
    0
    Bearings

    Like Danny We Had Good Luck W Em, 3/4. Blown Chevy And A Kb Olds Both Liked Them.
     
    #5
    shawn davis, Jan 6, 2006
  6. Mohrperformance

    Mohrperformance New Member

    Joined:
    Jan 12, 2006
    Messages:
    3
    Likes Received:
    0
    The purpose of the groves in the main bearings is to feed oil under pressure to the rod bearings. A longer grove will feed oil for a greater rotation of the crank. If you did not need to feed the rod bearings in this way, no groves in the main bearings would be required.
     
    #6
    Mohrperformance, Jan 12, 2006
  7. altered boy

    altered boy Outlaw Altered

    Joined:
    Aug 4, 2003
    Messages:
    418
    Likes Received:
    3
    thanks for the replies guys. i've been running clevite H bearings that are what i would call half grooved (meaning one side of the bearing is grooved). i assume i am correct in calling it half grooved. going to run king bearings in the next short block to try something different (and hopefully better).
    mohr: what is the trade off, if any on increasing oil to the rods vs. decreasing bearing surface on the mains?
    this has been great input... and educational... i did figure there were more folks out there running the kings that would at least chime in on what they have chosen to run and why...
     
    #7
    altered boy, Jan 12, 2006
  8. Randy G.

    Randy G. Top Alcohol

    Joined:
    Jun 9, 2003
    Messages:
    1,902
    Likes Received:
    38
    "Ding"

    We have a winner.
     
    #8
    Randy G., Jan 13, 2006
  9. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
    Staff Member

    Joined:
    May 6, 2003
    Messages:
    6,706
    Likes Received:
    133
    Bearings

    Maybe it's different in your situation, but in most blown alcohol applications, the Clevite V series bearing is the way to go.

    We ran King bearings several years ago, and had problems with them coming apart. There have also been many instances with the M series Clevite coming apart.

    The V bearing is a hard bearing and is harder to tune off of. However, it's hard to tune off of a blackened bearing if you know what I mean. I planned to start last year with the M bearings so I could sneak up on the tune-up, but after some of the bearings started to delaminate on a very soft tuneup, I switched to the V bearings.

    What I have noticed with the V bearing is you can monitor it's end to end distance to see if it's been hammered on vs. the traditional 'width' check at the bottom of the bearing. The diameter of the crank is 2.500 (std) and a new V bearing will typically come out of the box new at 2.503-2.510. If you hammer on a bearing that clearance will go down to 2.49 range. At the bottom of the bearing you will notice after scraping it really won't mash that section out as much as it did with the M bearings. If it did, you probably hammered that cylinder pretty good.

    Thats just my .02.
     
    #9
    Will Hanna, Jan 13, 2006

Share This Page





XenPorta 2 PRO © Jason Axelrod from 8WAYRUN.COM