1. 1Badcolt

    1Badcolt Well-Known Member

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    Were these a factory item on the hyd roller LA Magnum engines ??
    If building a early model LA performance engine with a solid lifter cam should one of these be used ?

    Screenshot_2018-07-12-23-58-57.png
     
  2. rumblefish360

    rumblefish360 so close yet so far away

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    Yes, they are. Those timing chain tensioners are inexpensive and good to have on any engine. When they started to use them as a OEM part, I do t know.
     
  3. 1Badcolt

    1Badcolt Well-Known Member

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    Ok thank you of course Im going to use a premium double roller chain just wanted to know if still needed .
     
  4. nm9stheham

    nm9stheham Well-Known Member

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    If you are building that gasser engine, that is going to rev to the moon, then I would personally not add that part. It is there to stabilize timing, by putting pressure on the chain on the slack side, but when you get the revs way up, and the chain is really flying, it might be more prone to break. A very few reports are out there of them breaking.

    I'd be putting my money into a geared timing set for that gasser. More stable and durable than a chain.
     
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    • rumblefish360

      rumblefish360 so close yet so far away

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      Gear drive ok?
       
    • furrystump

      furrystump Well-Known Member

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      I would not put one in, I had installed one and ran it for a couple of years. Pulled it apart to change pistons and the guide was in two pieces and the flat spring had eaten into the timing cover. It was NOT worn through! Smart people with real experience disagree about using one. I decided to try it and won’t do it again.
       
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      • pittsburghracer

        pittsburghracer Well-Known Member

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        Never used one. NEVER WILL. I've heard more bad stories than good.
         
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        • Hellrats

          Hellrats Still wrenching after all these years FABO Gold Member

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          I must be one of those stupid people. I put one in my truck 230,000 miles ago. Still runs great. My street cars get them, no problems so far. Don't race anymore so don't know about that. Factory started to use them when the 3.9 came out in 1987. The all V8 engines got them few years later.
           
        • rumblefish360

          rumblefish360 so close yet so far away

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          I’m stupid as well!
          But also let it be known it is not a race ride.
           
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          • 1994redram

            1994redram FABO Gold Member FABO Gold Member

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            I’ve torn into several V8 magnum engines and haven’t ever found one. I think they were only used on the V6. That being said, I put one on my 5.9 when I rebuilt it.
             
          • jos51700

            jos51700 Well-Known Member

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            If you need a gear drive, run a gear drive. If you need a chain, include the tensioner.

            If you don't know what you need, pm rustyratrod
             
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            • nm9stheham

              nm9stheham Well-Known Member

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              They were standard in Opel CIH engines but were much better built than these and had a oil pressure operated tensioner. My 2-3 shift RPM was 7500-8000 RPM. and that was in a rally car that saw thousands of shifts per event and high engine revs for miles and miles. Never an issue. So yes, they can work fine. But I've also pulled one like this out of a 4.7 that fell apart in my hands. I am just not very impressed with this particular design.
               
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              • Hellrats

                Hellrats Still wrenching after all these years FABO Gold Member

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                The 2.7 had that set up too. Good luck finding one alive today. It's all in the way they are used. Plus some people have no idea what the word maintenance means.
                 
              • yellow rose

                yellow rose Doctor of Thinkology.

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                I'm for a gear drive for what you are doing. You can run it under a stock timing cover. It won't make noise. Your cam timing will never change.


                Milodon 13600. Worth every single penny.
                 
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