CRANK WOBBLE!! Updated, found problem

Forced Induction Mopar

  1. jimjimjimmy

    jimjimjimmy lobsterman FABO Gold Member

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    Hey Jack a good balancer is good money spent you don't want this to happen again , the crank might not be as lucky next time .
     
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    • Houseoffubar

      Houseoffubar Well-Known Member

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      Bravo and congratulations on a cheap fix!
       
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      • MOPAROFFICIAL

        MOPAROFFICIAL FABO Gold Member FABO Gold Member

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        That thing is a cracked up pos, how long you have that balancer for, it couldn't have been new. I've had'em last 15 years without cracks in the elastomer like that.

        Btw everyone, the outer ring can come loose and wobble but the pulley is bolted to the center hub and would be as still as the crank regardless.
        Glad you got it figured and that it didn't come flying through the hood on the hwy somewhere.
         
      • yellow rose

        yellow rose Walking the crooked mile

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        That thing was JUNK when it was bolted on. Look at the elastomer. It’s had it.

        That failure isn’t from a belt too tight. That thing failed. I hope it didn’t hurt other parts, like main bearings or the block.
         
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        • MiradaMegaCab

          MiradaMegaCab Well-Known Member

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          BD20B5F8-831E-4D50-AF88-685D9DC04D98.jpeg

          Well as being that your engine is in the car, I’d suggest drilling and “pinning” the crank and new SFI Approved balancer....... You can make a crank pinning fixture relatively easily.
           
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          • Demonracer

            Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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            ^^^^ Very good idea.
             
          • yellow rose

            yellow rose Walking the crooked mile

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            Not sure why you’d want to pin it. The damper is press fit and if the press fit doesn’t hold it, the damper doesn’t work. The pin really won’t do anything.
             
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            • RustyRatRod

              RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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              Well GOOD! I sure am glad that's all it was and I KNOW you are, too, Jack!
               
            • MiradaMegaCab

              MiradaMegaCab Well-Known Member

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              Typically the crank is a double keyed PRIOR to installation......
               
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              • Coyote Jack

                Coyote Jack Member #55, I'm old FABO Gold Member

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                This is kind of my own fault. When I designed and built the engine The minds that know about these things were telling me that at the usual 6 to 7 lbs of boost I was running a second key was not required as the requirement for a second key starts at around 10 to 12 lbs of boost. Me being the adventurist that I am decided to push the limits this spring and change the pulleys to give me 10 to 11 lbs of boost. It was fun while it lasted but as usual it bit me in the ass. I am just happy it wasn't worse. A new damper will be ordered today and we will try again.

                Jack
                 
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                • Coyote Jack

                  Coyote Jack Member #55, I'm old FABO Gold Member

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                  Don't happen to have one kicking around do you? They are scarce as hens teeth here and Summit says 2 months to deliver one to Canada. That is standard for all the retail sellers in the U.S. right now.

                  Jack
                   
                • MiradaMegaCab

                  MiradaMegaCab Well-Known Member

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                  Ati 91828e internal balance SB Mopar
                  I ordered mine directly from Ati as I took advantage of their custom options. I had them reduce the stock 2.25 pulley hub, to 2” as that’s the standard I.D. of a blower pulley. I also had them change the six 3/8”X16 bolt threads to 3/8”X24 as I run studs to hold the blower pulley.

                  918282E - Google Search
                   
                  Last edited: Jul 3, 2020
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                  • 4spdragtop

                    4spdragtop FABO Gold Member FABO Gold Member

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                    • pishta

                      pishta I know I'm right....

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                      About the cheapest thing to replace, good 'bad' news! Fluidamper may throw the pulley alignment off, just an FYI.
                       
                    • yellow rose

                      yellow rose Walking the crooked mile

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                      PM sent
                       
                    • Coyote Jack

                      Coyote Jack Member #55, I'm old FABO Gold Member

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                      Damper is ordered. Went with the Mopar Performance SFI one. It was a little more expensive than the aftermarkets available but is getting here next week instead of 2 months away. Thanks to yellow rose for the offer he gave me. Appreciated.

                      Jack
                       
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                      • TheGrateRonzini

                        TheGrateRonzini FABO Gold Member FABO Gold Member

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                        So, why not run a crank hub and let the gilmer belt absorb the vibe? Hampton kits only come with hubs. Seems if it’s neutral balance, why fret? I just took my 383 crank in to be broached for a 2nd key with only a hub. Replacing the cast 400 crank with the 383 which is forged and input drilled. The Hub is like 150$. Peanuts compared to the ATI super damper, and you already have the pulley. Hampton kits, and dyers too, if I’m not mistaken, don’t utilize a damper
                         
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                        • RustyRatRod

                          RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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                          That's ridiculous. I think a lot of places are using the virus as an excuse to just do a sorry job.
                           
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                          • TheGrateRonzini

                            TheGrateRonzini FABO Gold Member FABO Gold Member

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                            I dunno RRR, I live in Buffalo and it takes at least 30 days to get anything either way across the border and it has been that way for quite some time. Most TO or Southern Ontario cats put up a po box in Niagara Falls, NY to avoid tariffs and lengthy delays in delivery.
                             
                          • RustyRatRod

                            RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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                            That's just stupid. I feel bad for our friends north of the border. We're all on the same hunk of dirt.
                             
                          • TheGrateRonzini

                            TheGrateRonzini FABO Gold Member FABO Gold Member

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                            I had 4spdragtop, before corona send me some hinge covers for a fastback rear seat. He is 2 or 3 hrs across the lake and it took 35 days to arrive!
                             
                          • RustyRatRod

                            RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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                            That's unacceptable.
                             
                          • TheGrateRonzini

                            TheGrateRonzini FABO Gold Member FABO Gold Member

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                            Besides agreeing with Rusty, cause well, it’s hard to disagree with rational thinking... Have you tried calling Dyers? They were more than helpful when I built my 6-71. Best prices and free advice. And they have a free online boost chart! Although my hub did come from BDS.
                             
                          • 604B1duster

                            604B1duster Well-Known Member

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                            I wish I saw this earlier. I was planning to put a blower on a 392 w2. I added Molnar rods and had it rebalanced, I had a second keyway added to crank and a second keyway added to 2 different balancers because I wasn’t sure about spacing or which one I was going to use. I have a Tci rattler and an Ati super damper, both double keyed.
                             
                            Last edited: Jul 5, 2020
                          • yellow rose

                            yellow rose Walking the crooked mile

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                            Any updates??? Is it running yet??? Just curious how it’s going.
                             
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