Blower crank hub
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Blower crank hub

  1. #1
    blown mopar moparjet's Avatar
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    Default Blower crank hub

    my buddy has a merlin 540 with a scat rotating assembly.. He is adding a blower set up to it. The crank was cut for a second key way. the machinist noticed when the blower hub was installed that it did not touch the lower timing gear. we then mesured a stock big block chevy balancer and the blower hub was .080 shoter than stock balancer. We called BDS (where it was purchased) and the mesured one off the shelf and it was the same. What gives? the hub is for a bbc 427 because its internal balanced. anybody run into this problem and how was it solved? Thans for input in advance
    throw it in reverse

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  3. #2
    gn7
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    Its common as dirt. ATI blower dampers set are shorter as well. I think the do it to move the blower pulley as close to the engine as possible and take the leverage off the snout,
    Are you hitting the timing cover before it hits the t gear? Or is the damper just not going on the snout far enough it hit the gear?
    If it just stops on the snout and won't go back any farther, you may may have to hone the hub. But be aware that the hub could hit a cast type T cover if you do. The other choice is to make a spacer to go between the hub and the T gear.



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    Last edited by gn7; 05-29-2013 at 01:03 PM.

  4. #3
    blown mopar moparjet's Avatar
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    Quote Originally Posted by gn7 View Post
    Its common as dirt. ATI blower dampers set are shorter as well. I think the do it to move the blower pulley as close to the engine as possible and take the leverage off the snout,
    Are you hitting the timing cover before it hits the t gear? Or is the damper just not going on the snout far enough it hit the gear?
    If it just stops on the snout and won't go back any farther, you may may have to hone the hub. But be aware that the hub could hit a cast type T cover if you do. The other choice is to make a spacer to go between the hub and the T gear.
    It bottoms out on the crank before touching the timing gear. spacer is what i need but how and what to make one out of. Is this normal to put spacer between hub and gear?
    Last edited by moparjet; 05-29-2013 at 01:28 PM.
    throw it in reverse

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  6. #4
    gn7
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    Quote Originally Posted by moparjet View Post
    It bottoms out on the crank before touching the timing gear. spacer is what i need but how and what to make one out of. Is this normal to put spacer between hub and gear?
    Are you saying there is a lip on the inside of the hub that stops the thing from going on any farther?



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  7. #5
    blown mopar moparjet's Avatar
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    NO. You could put it all the way on the then the crank snout would hang out and the crank bolt and washer would allow it to move back
    throw it in reverse

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    gn7
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    Quote Originally Posted by moparjet View Post
    NO. You could put it all the way on the then the crank snout would hang out and the crank bolt and washer would allow it to move back
    Not sure why you are running into that problem
    Seems the crank snout is further up inside the damper when the stocker is installed. Not sure how only .080 difference would cause the crank snout to extend out past the blower hub.
    Heard of the hub hitting cast covers before, but never the problem you are explaining.



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  9. #7
    blown mopar moparjet's Avatar
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    YEA me either.. guess we are gonna have to make a spacer washer some how.
    throw it in reverse

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