M bearings on a screw blower ?

Discussion in 'PSI Superchargers Tech Questions' started by PROMOD63, May 8, 2011.

  1. PROMOD63

    PROMOD63 Member

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    We tried using m rod bearings to tune a hemi with 40 plus lbs of boost on the dyno and at the track and had issues is there anyone who can put light on the subject of maybe we have outstepped the ability of the m bearing ? We thought it would be easier to tune with them now i am thinking they might be too soft to even use to tune with this much boost ? Any ideas ?
     
    #1
    PROMOD63, May 8, 2011
  2. secondwindracing

    secondwindracing top alcohol

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    running M bearing with 50# of boost and no problems, pan off after each pass..Dave
     
    #2
    secondwindracing, May 8, 2011
  3. Danny Humphreys

    Danny Humphreys Member

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    bearings

    43 lbs, no issues, your tuneup is off
     
    #3
    Danny Humphreys, May 9, 2011
  4. Don Onimus

    Don Onimus New Member

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    bearings

    You didn't tell us what they look like. Are you squeezing them, etc. How many runs ? I would say tune up. Don
     
    #4
    Don Onimus, May 9, 2011
  5. Mike Canter

    Mike Canter Top Dragster
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    It would worry me that anybody would be tuning a screw blower by leaning it out until it smashed the bearings. This ain't a Roots blower.
     
    #5
    Mike Canter, May 9, 2011
  6. Don Onimus

    Don Onimus New Member

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    Pro Extreme cars

    Hay Mike Just went to my first ADRL race this weekend. What are the 4 management cyl. bolted to the back of the injector's for? Is that traction control? LOVED IT Thanks Don
     
    #6
    Don Onimus, May 9, 2011
  7. Mike Canter

    Mike Canter Top Dragster
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    No traction control uses timing. Do you have a picture of it that you can email me at mike.c@mindspring.com
     
    #7
    Mike Canter, May 9, 2011
  8. PROMOD63

    PROMOD63 Member

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    fuel system fresh back from rage it seems to be taking the face off them like runing out of oil mainly on the front of the motor but it has good oil pressure we ran v bearings in the past with the roots deal at 35 lbs and never had any issues we even changed cranks thinking it was something there
     
    #8
    PROMOD63, May 9, 2011
  9. Mike Canter

    Mike Canter Top Dragster
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    Are you recording oil pressure for the whole run on the data logger? I am a little confused on "taking the face off" because M and V bearings are solid babbit without different layers like H bearings. There is no face to take off. You may be polishing them because of an oil supply problem. Do you have a dry sump or wet sump?
     
    #9
    Mike Canter, May 9, 2011
  10. Don Onimus

    Don Onimus New Member

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    cyl.

    Hey Mike, No I don't have any picks, but it had a plug end like we use on a Leahey set up. And yes Hamstra and some other cars had the 4 stg DMPE fuel timers. I was really shocked to see them on the cars. But they sure know what they are doing. 3.90's & 80's @ 200 + F. Taylor and Lomad kicked ass. .903 & high 89's 60 ft. Don
     
    #10
    Don Onimus, May 9, 2011
  11. Mike Canter

    Mike Canter Top Dragster
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    They are just fuel control.
     
    #11
    Mike Canter, May 9, 2011
  12. kbhemi

    kbhemi Member

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    A little info on M bearings - they have a .0003 tin plate - and it flakes and rips off - and will destroy cranks rods and blocks - I have FOUR junk cranks to prove it. Rod bearings are the worst - mains will go 4-5 runs - rods about 3-4 passes - till it kicks the rods out. I finally went ONE PASS and pulled the motor apart - the bearings were already flaking. I went round after round with clevite tech - till I got the well yea - they have had problems - thats why everyone uses the V bearing - which is a copy of the old vandervel bearing composition. Know of ANY fuel teams running M bearings - heck no - all run V. If you don't make any hp - then a M bearing will work fine. Since switching to V bearings I have had NO failures. I routinely go 30 passes - 1/8th mile - and they always look great - oh and no rods in the diaper either.
     
    #12
    kbhemi, Nov 28, 2011
  13. Horweenracing

    Horweenracing Member

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    what about the H bearings what application are they for?Thanks
     
    #13
    Horweenracing, Dec 2, 2011
  14. overkill69

    overkill69 Member

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    v

    According to Jim Oddy "H" is for horse$hit and "V" is for victory...LOL.
    M is for evaluating a tuneup and must come out every couple of runs from what I was told.
     
    #14
    overkill69, Dec 3, 2011
  15. Ghost - Kevin

    Ghost - Kevin Member

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    not the bearing..the tune-up

    had M's in all of 2004 in the old car with the BAE2 stuff. Ran 5.70's-5.90's all that year at 250+mph. Block and crank never came out of the chassis (14 races I believe). Ended the year with the same bearings we started the year with. We rotate 3 sets.

    M's will let you know if bad things are about to happen long before the V's. Unless you are really turning it up loud I wouldn't hesitate to use the M's if ya got them. And, on a new tune-up that's what I would start with. An M bearing and a HOT plug and you will stay in the safe zone. Both will let you know when you're getting stupid!

    And don't forget...there's a 100 ways to saddle a horse and they all run about the same.

    Kevin Hool
    The Ghost TAFC 10
    http://kandkmotorsports.com
     
    #15
    Ghost - Kevin, Dec 3, 2011
  16. Mike Canter

    Mike Canter Top Dragster
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    I think the early description of the Cleveite "M" bearing is incorrect. The "M" bearing has a nominal 0.006 in. single thick babbit layer on hardened-steel backings and ARE NOT flash plated. There is no other thin layer of anything ontop of that lead babbit. There is nothing to flake off because they are solid. They work great for main bearings.

    THe Clevite V series is basically the same single layer as the "M" bearing but uses lead-indium which is harder than the "M" babbit and they are also NOT flash plated. These work great as blower rod bearings or as the main thrust bearing if using M bearings for the mains.

    The Clevite H series performance bearing is a triple layered bearing and under great stress like a blower motor will flake off the first layer. The H bearing uses a lead-tincopper overlay but are not flash plated like a street bearing. These H beaings where first designed for NASCAR type racing.
     
    #16
    Mike Canter, Dec 6, 2011
  17. PROMOD63

    PROMOD63 Member

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    update !!!

    changed to a v bearing and ran the rest of the year with no issues 54lbs of boost 3.94@190 !!!! thanks for all the input
     
    #17
    PROMOD63, Dec 8, 2011

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