Dual Keyways
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Dual Keyways

  1. #1
    21 Daytona Outlaw's Avatar
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    Default Dual Keyways

    Should I cut dual keyways in my crank?
    1053 steel 4.00 stroke with a M3 Procharger
    I know it wont have the load that a roots type blower would have
    so whats the most common configuration? 3/16 and 1/4 @ 180°?
    I plan on running an ATI balancer/damper
    #55

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    Quote Originally Posted by Outlaw View Post
    Should I cut dual keyways in my crank?
    1053 steel 4.00 stroke with a M3 Procharger
    I know it wont have the load that a roots type blower would have
    so whats the most common configuration? 3/16 and 1/4 @ 180°?
    I plan on running an ATI balancer/damper
    i say yes most definetly...i would use 1/4", full length slot & square allen stock for the key ...this is what i ran on my blown SBC ages ago lol...just my .02 cents

    FastRat

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    Default Dual Keyway

    It is not needed on a BBC, except in the most extreme cases. The SBC has a problem with balancers lasting. Adding another keyway helps, but doesn't address the problem. There is very little material from the corner of the keyway to the seal surface. This is where they break. ATI offers 2 different hubs for their balancers. The first one adds 35% more material from the corner of the keyway to the seal surface. This will work with a stock timing cover and only requires a special seal. The second one adds 225% more material. It now has a BBC o.d. This requires a special timing cover for the SBC because it now has a BBC seal. It is pretty stout.

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    21 Daytona Outlaw's Avatar
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    yes BBC, so I dont need to worry about cutting the second keyway?
    #55

  7. #5
    steelcomp was here
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    Quote Originally Posted by Outlaw View Post
    yes BBC, so I dont need to worry about cutting the second keyway?
    You can go with a single 1/4" keyway and be safe. It's a PITA to have two keyways line up perfectly. A lot easier for a machinist to broach a new one in 1/4 and be done w/ it.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  8. #6
    21 Daytona Outlaw's Avatar
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    I just got a reply from ATI, they suggested thier part # 917740
    it has a 3/16 keyway in the stock location and a 1/4 @180°
    they can also drill it for 6 pulley mounting holes on a 3.200 bolt circle.

    my machine shop said no problem cutting the second keyway.

    Procharger suggested a second keyway over 10 psi boost
    I'm setup for 8

    I thought the 6 bolt circle would be a good idea since I will be running a
    crank trigger wheel between the balancer and blower pulley.

    is this overkill? good insurance? or a waste of time?
    #55

  9. #7
    Some guy obnoxious001's Avatar
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    Quote Originally Posted by Outlaw View Post
    I just got a reply from ATI, they suggested thier part # 917740
    it has a 3/16 keyway in the stock location and a 1/4 @180°
    they can also drill it for 6 pulley mounting holes on a 3.200 bolt circle.

    my machine shop said no problem cutting the second keyway.

    Procharger suggested a second keyway over 10 psi boost
    I'm setup for 8

    I thought the 6 bolt circle would be a good idea since I will be running a
    crank trigger wheel between the balancer and blower pulley.

    is this overkill? good insurance? or a waste of time?
    For the small amount it costs to have the 2nd key at 180 degrees, don't even give it a 2nd thought, do it and have the piece of mind. A decent machinist can get it right. My engine balancer does them for me, never had a problem with one lining up.

    The 6 bolt balancer is also the way to go.

  10. #8
    Senior Member The Violater's Avatar
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    Quote Originally Posted by Outlaw View Post
    I just got a reply from ATI, they suggested thier part # 917740
    it has a 3/16 keyway in the stock location and a 1/4 @180°
    they can also drill it for 6 pulley mounting holes on a 3.200 bolt circle.

    my machine shop said no problem cutting the second keyway.

    Procharger suggested a second keyway over 10 psi boost
    I'm setup for 8

    I thought the 6 bolt circle would be a good idea since I will be running a
    crank trigger wheel between the balancer and blower pulley.

    is this overkill? good insurance? or a waste of time?
    Thats the balancer I bought, came with 2 slots had the crank done, end of story, not absolutely nesc, but why not????
    / The Few The Proud TheBlown

  11. #9
    "It's HONDO, honey" Kyle's Avatar
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    Thumbs up

    cheap insurance for gulling up the end of a perfectly fine crank and then tearing it ALL down, mine cost 200 and bergeron cut the dampner as well
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  12. #10
    steelcomp was here
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    Quote Originally Posted by obnoxious001 View Post
    For the small amount it costs to have the 2nd key at 180 degrees, don't even give it a 2nd thought, do it and have the piece of mind. A decent machinist can get it right. My engine balancer does them for me, never had a problem with one lining up.

    The 6 bolt balancer is also the way to go.
    Won't argue with that....

    cheap insurance for gulling up the end of a perfectly fine crank and then tearing it ALL down, mine cost 200 and bergeron cut the dampner as well
    ...or that.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  13. #11
    "It's HONDO, honey" Kyle's Avatar
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    Quote Originally Posted by steelcomp View Post
    Won't argue with that....

    ...or that.
    This guy

    Get the key way cut Outlaw
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    21 Daytona Outlaw's Avatar
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    Thanks for the confirmation, It will be done....
    #55

  15. #13
    "It's HONDO, honey" Kyle's Avatar
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    Quote Originally Posted by Outlaw View Post
    Thanks for the confirmation, It will be done....
    K you got me..... wanted to up my post #, did it again


    ___________________________________________
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    "Chine walkin: (verb) - to show another brother that you will stay in to win. (syn.) Holy *hit!!!!!! Don't Lift!!!!!"

  16. #14
    21 Daytona Outlaw's Avatar
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    Quote Originally Posted by Kyle View Post
    K you got me..... wanted to up my post #, did it again


    LOL
    #55

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