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New experience

  1. #1
    Senior Member fleetimus's Avatar
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    Default New experience

    Last time out the engine started making a sound deep in the engine. Pulled it and found this.

    #2 & #3 plugs, rest looked fine.


    Turned it over and found this!!!!!
    Right side

    Left side


    Broken crank!!!!!! New one for me!!!

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  3. #2
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    what balancer are you running? is that broken behind #2 ?

  4. #3
    gn7
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    When they break, its usually between the rod pin and the main on the pin arm. More common behind #8, because every bit of torque gets transmitted through it. When they break up there, it usually a flawed crank, or a junk damper. Unless of course this a v-drive running off the snout. Then all bets are off and that doesn't surpise me one bit.

    Cast crank? Scat I beam rods?



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    Last edited by gn7; 10-24-2010 at 05:39 PM.

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  6. #4
    No Sandbar To Far sanger rat's Avatar
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    Default

    No damaged other than the crank?
    Quote Originally Posted by One More Year View Post
    The only blab's I will even be a part of is just when it is me they are talking about. Aaaah yes I can see a few good looking shiny tall deck motors on the beach, with barely enough fuel to get back to the launch saying, "Holy crap how fast you think that Daytona was going man? That's like the 20th time he's gone by today?"

  7. #5
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    Looks like a forged crank, with the wide parting line. Whats wrong with the plugs? It looks like maybe the side strap is pushed down on the center electrode? Kinda hard to see in the pictures.

    Chris

  8. #6
    gn7
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    The part line does look like a forging. Would it amaze anybody to learn that there may be some cast cranks deliberately made to look like forgings? I think the plug got like that because those two cylinders gained a little stroke when the crank broke. Either that, or the crank is broke because it got tired of the piston hitting the head.



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  9. #7
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    wow at least ya caught it early nuff no major damage happened, just a crank and line hone it

    Dare to be different, if it turns out great you can claim you planned it that way.

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  10. #8
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    Default Not a new one.

    A flex crack. Stock crank& rods. Not suppost to use your engine as a water pump. It doesn't like compressing water.Time for new motor.Nicely done.Learning the hard way.
    Last edited by aquacraft; 10-25-2010 at 09:10 AM.

  11. #9
    huge member jimthetoolman's Avatar
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    Default crankshaft

    Hey Fleetimus: I have a brand new GM forged crank part number #14097044 454 gen 5 and 6 if your interested. Jim

  12. #10
    gn7
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    Quote Originally Posted by aquacraft View Post
    A flex crack. Stock crank& rods. Not suppost to use your engine as a water pump. It doesn't like compressing water.Time for new motor.Nicely done.Learning the hard way.
    Clean your monitor there Aquacraft. 7/16 cap screw rods? Stock? Stock what? 427 medium riser Ford? Cammer Ford? Water will do that. But iot sure as hell won't turn a thru bolt rod into a capscrew rod with a single strengthing rib on the cap!



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  13. #11
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    IMHO Looks like a rod kinda broke too

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    Default What?

    That is not a ford or a ford 427 cammer. It's a stock chevy 454. You can see the cast mold line mark on the crank. Cast iron , not steal.Nice try, but wasn't born yesterday.I would guess that the block is stessed too.

  15. #13
    gn7
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    Quote Originally Posted by aquacraft View Post
    A flex crack. Stock crank& rods. Not suppost to use your engine as a water pump. It doesn't like compressing water.Time for new motor.Nicely done.Learning the hard way.
    Quote Originally Posted by aquacraft View Post
    That is not a ford or a ford 427 cammer. It's a stock chevy 454. You can see the cast mold line mark on the crank. Cast iron , not steal.Nice try, but wasn't born yesterday.I would guess that the block is stessed too.
    Just reading your own post genius. Stock Chevy 454 did not come with capscrew rods. And the rod caps had two strengthing ribs, not one. Ford cammers and medium risers did have capscrew rods. Your right, those are not Ford rods. And they are not stock 454 rods. Get your head out of your ass before you decide you want to school me on a FE Fords.



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  16. #14
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    So someone went cheep and put a cast crank in a 454. Externaly balanced. Waste of money . He says it's 13:1 pistons, on a cast crank. Anyway .

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