MY HELLCAT BROKE A ROCKER ARM AT 1,500 MILES

Discussion in 'SRT Hellcat General Discussions' started by IEATZL1's, Jan 14, 2015.

  1. IEATZL1's

    IEATZL1's Gold Member

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    Fixed...but I wonder why they use aluminum cast rocker arms on this monster. Should be cast iron if you ask me. 10920899_834238766649640_6689503675057761469_n.jpg
     
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  2. bolivarshagnasty

    bolivarshagnasty Gold Member

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    Looks cast in the photo. Who said it was aluminum?
     
  3. CivilEngineer42

    CivilEngineer42 Silver Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    Oh. How nice 60K car and the engine wants to come apart at 1500mi......Boy I hope that is just a one off occurrence.......
     
  4. LITSOUT

    LITSOUT Gold Member

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    From Hot Rd Mag:

    Rounding out the valvetrain overview, the Hellcat's valves are moved by hydraulic roller lifters that are otherwise the same ones used in the non-MDS cylinders of the Apache 392. They likewise act on a very stable shaft-style rocker system comprised of investment-cast stainless steel rocker arms mounted to a pair of steel shafts: one for all the intake valves of each head, and one for all exhaust valves on each head. Lube is fed to the rocker trunnions via hollow hardened pushrods and pressurized lifters, as is standard per all Gen III Hemis.
     
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  5. GeneralLee

    GeneralLee Silver Member

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    Aluminum are used in plenty of racing and street applications. I have a feeling that there was a defect of some sort here. Yes they can fatigue before steel but usually after tons of miles and abuse. Lets just pray whoever is making these things isn't using sub spec materials or processes. If we see more break along with driveshaft's it might be that Dodge went after cost savings.

    Could you give us all a little background on how you had been driving the car and what you were doing when it broke? Not saying you did anything to cause just curious.
     
  6. MoparProud

    MoparProud Silver Member

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    It happens. If, IF, a lot of them pop up, then there's an issue.

    Chalk it up to an "oh well" and keep on truckin'
     
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  7. Dak59RT

    Dak59RT Gold Member

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    Glad you got it fixed and it's simple enough to not need/want a new motor.
     
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  8. april77

    april77 Naughty SheDevil Mod Staff Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    Glad the Hellcat is feeling better! Now, get back out of the road and enjoy!!

    April
     
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  9. Dances With Empties

    Dances With Empties Gold Member

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    I'm not a metallurgical engineer, but cast aluminum rockers make no sense to me? To the O.P.: Are you sure they told you cast aluminum?... I.M.O. it would not be strong enough & allowing two dissimilar metals of, I assume, different hardness to constantly contact one another would be a recipe for failure... Again my uneducated opinion!!!
     
  10. CivilEngineer42

    CivilEngineer42 Silver Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    They mix different metals all of the time-Engineering Term: Alloys

    Aluminum can in some instances be stronger than steel depending on the composition of the alloy. But when you starting talking about those kinds of alloy's they are exotic and extremely high priced. And in some case regulated by the government.

    As an Engineer (Civil) and not an Auto Engineer, the only question I would have to Designers is why "Cast" and not "Forged" and I would think the answer would be cost effectiveness of casting vs forging.......The alloy used had a safety factor of 3-1 for failure in that application.........
     
  11. Dances With Empties

    Dances With Empties Gold Member

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    I grasp the term & what you are saying & agree cast is cheaper than forging. But I'm highly skeptical that is an aluminum casting as the o.p. stated, but could be a steel alloy of some type. Both for the reasons you mentioned & the advantage of similar metals in contact with one another.

    I'm not saying that I'm right. Hell I didn't build or design it. Just sounds weird to me... I realize there are coating processes involved as well for both heat & lube advantages. But it doesn't sound right.
     
  12. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    See reply #4, Rockers are stainless steel as are the rods they mount too...
     
  13. bolivarshagnasty

    bolivarshagnasty Gold Member

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    Yeah, what TallCool1 said. investment cast stainless steel rocker arms
     
  14. hellcat1

    hellcat1 Gold Member

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    That's very scary on a brand new car with only 1500 miles
     
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  15. Tammie

    Tammie SRT Hellcat Moderator Staff Member Gold Supporting Member

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    I am still of the opinion that it is an isolated incident and it was a faulty rocker arm and not the norm. You know if they are digging that far into the motor, they are going to check the others for stress fractures and other similar issues. Lets hope it is just a one time thing and there are no additional problems. We have guys already out there racing these things, we are going to have a few issues, but when we start seeing recalls for the same thing then maybe we can address it as a manufacturing concern. I am sticking to the theory that a lot of time and money went into the design of this engine and I cannot imagine they would cut corners that would cause failure. Our cars would still be sitting in Taylor Yard if there were serious issues of concern.
     
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