Main bearing help
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Main bearing help

  1. #1
    B1 Racing cs19's Avatar
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    Default Main bearing help

    I'm switching over from King's. Seems their quality control has slipped, I've got a new set here and they are crap and they are hard to read after running so Im done with King bearings. Had good results with Clevites in my rods so I would like to run Clevite mains now.

    Im trying to figure out their part number deal and its not making sence to me. What Im looking for is their "H" series main bearing, with the Tri metal coating in -.001 size. (I mean .001 less clearance) I'm unsure on which grooving I'll need, i was running 3/4 groove with no issues on rods or mains but it looks like clevite only offers 1/2 grooving or full grooving.

    I chose the "H" series because of the medium eccentricity, med-high RPM use (7,000) large champhers for large crank fillets (need that for my Lunati) - actually they are not champered anymore from what Im reading, they are now shortened up, apparently "H" are no longer available and now they are "HN" just to make things more difficult with part numbers.

    So anyways -.001 Tri-armor coated "HN" main bearings with 1/2 groove. If anyone can help with the part number that would be great.

    Thanks for any help.

    Chris.

    Here is some good info on Clevites if anyone is interested.

    http://mahleclevite.com/publications/EB-10-07.pdf
    Last edited by cs19; 01-27-2009 at 10:58 PM.
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  3. #2
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    Quote Originally Posted by cs19 View Post
    I'm switching over from King's. Seems their quality control has slipped, I've got a new set here and they are crap and they are hard to read after running so Im done with King bearings. Had good results with Clevites in my rods so I would like to run Clevite mains now.

    Im trying to figure out their part number deal and its not making sence to me. What Im looking for is their "H" series main bearing, with the Tri metal coating in -.001 size. (I mean .001 less clearance) I'm unsure on which grooving I'll need, i was running 3/4 groove with no issues on rods or mains but it looks like clevite only offers 1/2 grooving or full grooving.

    I chose the "H" series because of the medium eccentricity, med-high RPM use (7,000) large champhers for large crank fillets (need that for my Lunati) - actually they are not champered anymore from what Im reading, they are now shortened up, apparently "H" are no longer available and now they are "HN" just to make things more difficult with part numbers.

    So anyways -.001 Tri-armor coated "HN" main bearings with 1/2 groove. If anyone can help with the part number that would be great.

    Thanks for any help.

    Chris.

    Here is some good info on Clevites if anyone is interested.

    http://mahleclevite.com/publications/EB-10-07.pdf
    Chris,
    The part number should be MS829HK-1 for the coated .001 under bearings., MS829HK for standard, and MS829HKX for X-tra clearance. Removing the "K" from the part number means it is non-coated.
    I personally feel you'll be better off with the standard half groove over the 3/4 as all the 3/4 really does is allow more flow and pressure loss at the parting line reducing oil control and the quality of shot at the rod bearing. Fully grooved really starts to make a mess!


    By the way, that block looked great!

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    Quote Originally Posted by Warp Speed View Post
    Chris,
    The part number should be MS829HK-1 for the coated .001 under bearings., MS829HK for standard, and MS829HKX for X-tra clearance. Removing the "K" from the part number means it is non-coated.
    I personally feel you'll be better off with the standard half groove over the 3/4 as all the 3/4 really does is allow more flow and pressure loss at the parting line reducing oil control and the quality of shot at the rod bearing. Fully grooved really starts to make a mess!


    By the way, that block looked great!
    X2
    Also Clevite has added an "N" to the rod bearings for narrowed. A rod bearing would be a CB743HNK for BBC std coated.
    Chris Straub
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    gn7
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    Clevite no longer chafers their bearings and chooses to narrow them instead. Cstraub in correct, the part # now carries the "N" for narrowed. If you wish to to continue using chamfered and 3/4 groove you need to go to Federal Mogal/Speed Pro C141M1 coated, 141M1 uncoated



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    B1 Racing cs19's Avatar
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    Thanks guys.

    So does my part number have the "N" in it or not?
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    B1 Racing cs19's Avatar
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    Quote Originally Posted by gn7 View Post
    Clevite no longer chafers their bearings and chooses to narrow them instead. Cstraub in correct, the part # now carries the "N" for narrowed.
    beat me to it.
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    B1 Racing cs19's Avatar
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    Ok so...

    MS829HNK-1 does not turn up any results.

    MS829HK-1 does. I will order these, they will probably show up with an "N" on them?

    This is from clevite.....

    Please note: Some “H”
    series bearings will no longer
    be available with enlarged
    chamfers. Instead, the
    bearings will be narrowed
    in place of the enlarged
    chamfer to provide greater
    crankshaft fillet clearance.
    The new narrowed bearings
    will be available with a “HN”
    suffix and will be replacing
    the standard “H” suffix part
    number.
    Last edited by cs19; 01-28-2009 at 07:47 AM.
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    B1 Racing cs19's Avatar
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    Quote Originally Posted by Warp Speed View Post
    By the way, that block looked great!
    thanks. it ended up at just over 11 lbs. lighter. I could get more but its too time consuming and i have a race in less than 8 weeks.
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    gn7
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    Quote Originally Posted by cs19 View Post
    I'm switching over from King's. Seems their quality control has slipped, I've got a new set here and they are crap and they are hard to read after running so Im done with King bearings.

    Chris.
    If you go with coated bearings......a blind man can read em



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    Quote Originally Posted by cs19 View Post
    Thanks guys.

    So does my part number have the "N" in it or not?
    No, only the rod bearings have the "N" in the part number.
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  13. #11
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    Quote Originally Posted by cs19 View Post
    Ok so...

    MS829HNK-1 does not turn up any results.

    MS829HK-1 does. I will order these, they will probably show up with an "N" on them?

    This is from clevite.....

    Please note: Some “H”
    series bearings will no longer
    be available with enlarged
    chamfers. Instead, the
    bearings will be narrowed
    in place of the enlarged
    chamfer to provide greater
    crankshaft fillet clearance.
    The new narrowed bearings
    will be available with a “HN”
    suffix and will be replacing
    the standard “H” suffix part
    number.
    It's not too hard to make a fixture for the lathe and narrow them yourself.
    What are you running for clearances? What oil?
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    Super Moderator HammerDown's Avatar
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    Question

    Question...do the narrowed bearings have any negative effect on oil control?
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Quote Originally Posted by HammerDown View Post
    Question...do the narrowed bearings have any negative effect on oil control?

    Not measurable unless the edge of the bearing really starts getting close to an oil passage (rod bearing). Typically not found in most cases but something to check for sure!
    Main bearing clearance and oil groove design have a WAY bigger impact on oil control!
    You would be surprised how much even 3 tenths across the board can change oil flow!

  16. #14
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by Warp Speed View Post
    Not measurable unless the edge of the bearing really starts getting close to an oil passage (rod bearing). Typically not found in most cases but something to check for sure!
    Main bearing clearance and oil groove design have a WAY bigger impact on oil control!
    You would be surprised how much even 3 tenths across the board can change oil flow!
    I understand Warp...my thoughts are when the rod side clearance is at the max, along with the narrowed bearing.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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