Crankshaft Dampers

Discussion in 'Drivetrain, Exhaust and Electrical' started by captdistraction, Dec 13, 2016.

  1. captdistraction

    captdistraction I am the breaker of things

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    One last drivetrain post for today ;)

    While I refresh all the engine hardware I'm looking at my vibration damper and wondering if the oe replacement piece I have should be replaced by something better or if it is fine.

    I've researched and outside those who need a SFI rating it doesn't seem to be much benefit, and honestly the last time I had a damper/balancer issue was on a old sn95 302 that kicked the outer ring.

    Thoughts? Does this part contribute to any wear or issues on the crank driven items like the oil pump gears?


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  2. steveespo

    steveespo Lord knows I'm a Voodoo Child Moderator

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    You don't want me to answer but an ATI damper is on my list as an upgrade to prevent high rpm harmonics from affecting the oil pump gears and timing set along with the $500 oil pump (Ford Performance CJ) and $240 billet timing gear (TSS). I figure while I am in the front of the motor swapping cams might as well give it some good parts to keep it together at 8000 rpm.


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  3. BigTaco

    BigTaco TMO Addict

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    The ATI is a nice piece. If it were me, based on all the issues you have had, I would definitely do this. It will definitely add to longevity but is totally overkill.

    I like overkill. I would use the ARP bolt as well.

    ARP Balancer bolt: PN# 156-2502
    ATI Coyote balancer: PN# 918047 with AC pulley
    PN# 918047 without AC pulley (this is probably the one you want for you build)


    Another approach would be to get the M-6600-A50PKIT since it includes things you are going to probably need for final assembly anyway, especially since you are going to use a Moroso pan......

    Sorry, I like to spend other peoples money.......lol
     
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  4. captdistraction

    captdistraction I am the breaker of things

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    I ordered all the gaskets and such. I'm toying with replacing the moroso pan and covers (mine have been painted) but we'll see.
     
  5. Smilieboy

    Smilieboy TMO Race

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    How much of a difference does this make? Is it mostly to reduce harmonics or is it suppose to be lighter and all that good stuff?
     
  6. captdistraction

    captdistraction I am the breaker of things

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    It seems to be lighter though I am running one with no ac pulley on it. I'll weigh them soon.

    If the box is to be believed:
    [​IMG]


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  7. steveespo

    steveespo Lord knows I'm a Voodoo Child Moderator

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    9lbs without AC pulley, 9.2 with. Stock is 11.1 lbs.


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  8. Mad Hatter

    Mad Hatter Gotta go Faster

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    I just wanted to bump up this thread. While we were putting together the engine we noticed the inside of the damper seemed a little worn... Has anyone had some time with the ATI damper?? Was it worth it over the stock unit??

    upload_2018-11-13_21-43-44.png
     
  9. captdistraction

    captdistraction I am the breaker of things

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    According to Ford Performance, my aluminator split it’s crank in half due to the ATI unit and they never recommend any coyote engine to use them for any application.


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  10. Mad Hatter

    Mad Hatter Gotta go Faster

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    Well thats nice to know!!! And the OEM one is a whole lot cheaper!!! Tasca has part number
    CR3Z-6312-A for $62.26
     
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  11. blacksheep-1

    blacksheep-1 TMO Addict

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  12. bpracer

    bpracer Mark

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    I was wondering about the outcome of that investigation. I must have missed the update in your thread.

    Maybe the ATI being lighter is no bueno... they were very widely used in NASCAR years ago, no idea what is used now.

    Rubber that changes hardness and therefore damping as it gets old, means they have a finite life (Fluidamper being a notable exception). I've run a Fluidamper on an old 351W "race" engine. They were the hot ticket maybe 20 years ago but have not heard much about them lately. I don't think they make anything for non-pushrod V8s.

     
  13. 03GTinFLA

    03GTinFLA TMO Intermediate

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    I had a shop do oil pump gears and they replaced the dampner with a new stock dampner. It lasted exactly 250 miles to the track and on the second run of day 1 in amateur group 1, it split in half. I have an ATI going in now. Captain distraction is the only instance I’ve found of an issue with ATI so I’m hoping ford saying the crank issue was that is just their way of saying they don’t have to pay for it. And hopefully I have no issues with it because this is getting expensive. Haha.
     

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  14. captdistraction

    captdistraction I am the breaker of things

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    Hard to say. I don't buy the lines I received from FRPP or ATI. ATI at least disassembled the damper in its entirety and went through to find nothing wrong. I don't know exactly what Ford Performance did besides shrug.

    That said, a very young $11,000 aluminator based motor was vaporized in the process. I am running an OEM damper on my ongoing builds.

    Did the shop use an oem part or a third party (rebuild)? I tried one of those once a few motors ago and it didn't go well.
     
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  15. 03GTinFLA

    03GTinFLA TMO Intermediate

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    The shop owner said they used OEM straight from ford. Then I was talking to one of the guys in the shop about how I had a hard time finding a replacement that weekend while at the track and had to use an autozone one. He said yep that’s the exact same one we used. Grrrrr. So they are refunding me the price of the original dampner and putting on the ATI, which I bought, for free.
    Sorry to hear about your motor. Makes me feel dumb complaining about my split dampner. I guess its like they say, it could alway be worse.
     

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  16. Nvrfinished

    Nvrfinished TMO Advanced

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    This is interesting. I'm going to be upgrading to a Power Pack 3 with the 7500 Rev limit and was thinking about a better dampner for the higher revs. Maybe not...
     
  17. BigTaco

    BigTaco TMO Addict

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    I don’t think Ford has a problem with ATI dampers, they are used on some very powerfull Aluminator based builds(JTP’s drift mustang for example) and even tore one down on the website(ATI equipped). They do have issue with them being installed incorrectly. I’m not claiming that is the reason for any of the failures in this thread; I have no idea what the causes are.
     
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  18. captdistraction

    captdistraction I am the breaker of things

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    They used no unclear language when talking to me about the recommendation to not use the damper. Only the cobra jet uses it, and only to meet nhra sfi requirement. Otherwise no 5.0 tivct engine they produce had an aftermarket damper on it


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  19. Mad Hatter

    Mad Hatter Gotta go Faster

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    That's good enough for me... Seems to be a lot of race hours with the stock damper....
     
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  20. 74mach

    74mach TMO Intermediate

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    What does Roush use on the GT4 engines?
     

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