Bearing Clearance? - Page 2
+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 15 to 28 of 28

Thread:
Bearing Clearance?

  1. #15
    LP-25.com Infomaniac's Avatar
    Join Date
    Dec 2007
    Location
    New Port Richey, FL
    Posts
    16,857

    Default

    Quote Originally Posted by SoldHondaBoughtHondo View Post
    Small blocks used to come like that from GM, something about a semi-line bore.

    I saw a guy hone a little extra on the big end to get a little more clearance,probably not the right way but it hasn't caused any problems so far.

    If i remember correctly GM calls .001 minimum on rods....fine for a basic mo ho but in a boat it will start pitching parts after a few min. @ 5500. 2.199 crank and std brngs and the dummy who assembled it didn't double check machine shop.
    The line hone establishes the bearing "crush", not a good idea to jack with that.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #16
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by SoldHondaBoughtHondo View Post
    Small blocks used to come like that from GM, something about a semi-line bore.

    I saw a guy hone a little extra on the big end to get a little more clearance,probably not the right way but it hasn't caused any problems so far.

    If i remember correctly GM calls .001 minimum on rods....fine for a basic mo ho but in a boat it will start pitching parts after a few min. @ 5500. 2.199 crank and std brngs and the dummy who assembled it didn't double check machine shop.
    I can't say I ever saw GM do that with a SBC, but of the 2 BBCs I have stripped down that I KNOW were factory original, both hand mismatched bearings to account for misalignment. I have built a few SBC that were not align honed, and never built a BBC that wasn't.
    Honing bearings for clearance is nothing new. Vic Edelbrock use to use under sized main bearing and align hone the block with bearings installed pretty regularly. But the bearings had .015-..020 of silicon aluminum bearing material. You can hone a King bi metal bearing with no problem.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  4. #17
    [email protected]
    Join Date
    Feb 2008
    Location
    Ohio
    Posts
    1,011

    Default

    The engine is a N/A 468 single Dom. Has a Callies Compstar crank, Eagle H beam rods internally balanced and the mains have been align honed when converted to 4 bolt. The second machine shop I had it to, said it was done right. I'm running this in a 9 second hydro turning 7500. Sounds like you guys are leaning to the tighter clearance. What brand of bearing is suggested? Plain or coated? Thanks

    Tim

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #18
    Gone
    Join Date
    Dec 2007
    Location
    Sparks, Nevada
    Posts
    1,824

    Default

    Quote Originally Posted by River Rat 005 View Post
    As to not to high jack a thread, back in '09 I was having bearing issues. I was running .0025/.003 clearance turning 7500 RPM with an Eagle crank. I found that the crank was bent and replaced it with a Compstar. I was also told my clearances were to tight and I was told to use .003/.0035. They ended up at .0029/.0034. Now lately I've been reading and it seems my clearances are big and it's being recommended to use the tighter ones again. I've checked my bearings and feel I can reuse them and only replace the rings. Now I'm wondering about clearances again.

    Tim
    I don't get it.
    You had "bearing problems".
    You changed the crank and the clearance.
    Now you have checked your bearings and they look so good you can reuse them.......but you want to jack with that.

    Sounds like you need to stop reading so much.

  7. #19
    [email protected]
    Join Date
    Feb 2008
    Location
    Ohio
    Posts
    1,011

    Default

    Quote Originally Posted by Fiat48 View Post
    I don't get it.
    You had "bearing problems".
    You changed the crank and the clearance.
    Now you have checked your bearings and they look so good you can reuse them.......but you want to jack with that.

    Sounds like you need to stop reading so much.
    Thats just what I was thinking. Seeing these clearances tighter got me thinking more than I needed. I guess I should have listened to Jockorace in the first place. Thanks



    Tim

  8. #20
    Senior Member jockorace's Avatar
    Join Date
    Feb 2008
    Location
    Whitewright, TX
    Posts
    3,359

    Default

    Quote Originally Posted by Fiat48 View Post
    I don't get it.
    You had "bearing problems".
    You changed the crank and the clearance.
    Now you have checked your bearings and they look so good you can reuse them.......but you want to jack with that.

    Sounds like you need to stop reading so much.
    x2 ! Jocko

  9. #21
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by jockorace View Post
    I actually think you answered your own question! Jocko
    Quote Originally Posted by gn7 View Post
    I don't remember anybody saying those numbers are too big. Maybe bigger than necessary, but they will work fine with the right oil.
    You don't mention what the "too tight" clearances were. Maybe they were, maybe they weren't.
    Quote Originally Posted by Fiat48 View Post
    I don't get it.
    You had "bearing problems".
    You changed the crank and the clearance.
    Now you have checked your bearings and they look so good you can reuse them.......but you want to jack with that.

    Sounds like you need to stop reading so much.
    I think it was answered in post 2 & 3.
    I will the very first to admit, I don't remember ever using a half set to tighten clearances, looser yes, but never tighter. Many have, and I fully understand their reasons. I just have never found it necessary. I am admittedly more than willing to run a little looser than many.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  10. #22
    Gone
    Join Date
    Dec 2007
    Location
    Sparks, Nevada
    Posts
    1,824

    Default

    To that end Bob I have done that many times. Very common to get the clearance I know that works for me. I have even used Kings
    because they have more clearance in a situation where the line hone might be a little tight and the crank a little high.
    But the bottom line is if it ain't broke don't fix it.

  11. #23
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,283

    Default

    So what do you do if you only need to gain (or lose) .0002" or .0003"?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  12. #24
    LP-25.com Infomaniac's Avatar
    Join Date
    Dec 2007
    Location
    New Port Richey, FL
    Posts
    16,857

    Default

    Quote Originally Posted by steelcomp View Post
    So what do you do if you only need to gain (or lose) .0002" or .0003"?
    Mic it again until you don't.

    I think I saw Fiat on here.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

  13. #25
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by steelcomp View Post
    So what do you do if you only need to gain (or lose) .0002" or .0003"?
    I have only had to lose a smidge once when it was just a too much even for me. So I coated the bearings because it made feel better. Seemed to work fine. I could have in that one situation used a half set and been a shade tighter. Never seen a crank that need a full undersized set, although I have heard of them. A member PM'd me about needing .002 under not too long ago.

    I would use an undersized half set it I had too, just never been there. If I was trying to reduce the clearance by .0003, I would have to be at something approaching .004 on main or .0035 on a rod and then I would be concerned that I removed .0005.

    I really lose very little sleep over bearing clearances.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  14. #26
    Senior Member Hass828's Avatar
    Join Date
    Dec 2007
    Location
    okie, lake Texoma
    Posts
    6,275

    Default

    Quote Originally Posted by steelcomp View Post
    So what do you do if you only need to gain (or lose) .0002" or .0003"?
    So does is that a make it or break it deal? .0028-.0030? .0029-.0031? Mains-Rods-when does it make an engine blow all to hell? Quit beating around the bush and lets hear some dead positive specs to build buy. Blown, Nos, N/a, stock, 8cyl but only running on 6cyl. ect.
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
    [email protected] first pass

  15. #27
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by Hass828 View Post
    So does is that a make it or break it deal? .0028-.0030? .0029-.0031? Mains-Rods-when does it make an engine blow all to hell? Quit beating around the bush and lets hear some dead positive specs to build buy. Blown, Nos, N/a, stock, 8cyl but only running on 6cyl. ect.
    I myself can't answer that Hass, by in my personal use, it would have to be more along the lines of .0037 or .0038. Then I am ready pull it back to .0035. Its never entered my mind to "fix" your above numbers. But like I said, I lose very little sleep over bearing clearances.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  16. #28
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by Infomaniac View Post
    Mic it again until you don't.

    I think I saw Fiat on here.
    Its always helpful to a set of + and - mics on hand to get you where you want to be

    Yeah, who know Bob was lurker.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95