Mopar Performance Purple Mechanical Camshaft - P4120653AE Cam Card

Small Block Mopar Engine

  1. 512Stroker

    512Stroker We are all here because we are not all there.

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    I am looking for the cam card info for a Mopar Performance Purple Mechanical Camshaft - P4120653AE
    Thanks
     
  2. Rmoore

    Rmoore Well-Known Member

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    17F1397E-A1EE-46EA-BF2A-ADAEB0E4F293.png
     
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    • 512Stroker

      512Stroker We are all here because we are not all there.

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      More specifically I am looking for the valve timing events found on the cam card.
      When the intake and exhaust valves open and close.
       
    • rumblefish360

      rumblefish360 So close, yet so far away FABO Gold Member

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      They were never given by mopar
       
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      • 512Stroker

        512Stroker We are all here because we are not all there.

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        Dam the luck
         
      • 512Stroker

        512Stroker We are all here because we are not all there.

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        Be pretty tough to do a thorough job to degree in the cam
         
      • RustyRatRod

        RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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        Here you go. Just scroll down to the part number. It's all right there.

        Chrysler High Performance Cam Data
         
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        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

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          MoPar have instructions on how to set it up the simple way. As long as the camshaft was ground properly as per MoPars specs, there should be no problem at all.
           
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          • CFD244

            CFD244 FABO Gold Member FABO Gold Member

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            So, aftermarket cam manufacturers include the timing events on a cam card so you can make sure that they ground it properly?
             
          • RustyRatRod

            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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            That and so you can degree it properly, yeah.
             
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            • PRH

              PRH Well-Known Member

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              With the cam in the motor, and a few minutes with a degree wheel and a pointer....... you could have the events for any lift point you choose.
               
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              • OLDSTYLE

                OLDSTYLE Well-Known Member

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                On the last couple I did one degreed in at 110.5 the .050 numbers were IVO 12 IVC 53
                EVO 55 EVC 9
                The other one in at 109 the .050 numbers were IVO 13 IVC 50.5
                EVO 58 EVC 7
                 
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                • 512Stroker

                  512Stroker We are all here because we are not all there.

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                  I do not have this cam yet.
                  It is one that I am looking at for possible future use.
                  May be tough to find one a few of the sites I looked at stated "not available"
                   
                • rustycowll69

                  rustycowll69 Well-Known Member

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                  Is that a misprint for cam with 102 installed centerline?
                  If given recommended installed centerline number, can't you simply Calc the events?
                   
                • 512Stroker

                  512Stroker We are all here because we are not all there.

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                  102 ? which cam ? I did not see that.
                  No you cant calculate it on paper
                  You can measure the valve timing events with a degree wheel after it is installed.
                   
                • rustycowll69

                  rustycowll69 Well-Known Member

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                  4529343. Sl/6 mech.
                  Oh, I think you can Calc the events. Maybe not at 0.050", but the theoretical events, which is the way Mopar used to advertise them.
                   
                • rustycowll69

                  rustycowll69 Well-Known Member

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                  As an example:
                  284 adv duration, meaning 284/2=142 ea side of int lobe centerline.
                  Intake @ 110 atdc.
                  For int opening event:
                  142-110= 32 btdc. Int opens
                  For int closing event:
                  110+143=252; 252-180= 72 abdc.
                  Compare to the chart.
                  QED
                   
                • 512Stroker

                  512Stroker We are all here because we are not all there.

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                  102 is most likely correct the intake lobe centerline is 102*
                   
                • rustycowll69

                  rustycowll69 Well-Known Member

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                  Wrong, see #18
                   
                • 512Stroker

                  512Stroker We are all here because we are not all there.

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                  Im sorry I should have clarified you cant calculate all the data points given on a cam card. And I trust a degree wheel to be absolute.
                   
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                  • rustycowll69

                    rustycowll69 Well-Known Member

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                    My point wasn't to prove you wrong. It was to show you don't have to have the cam events printed FOR you. With just the cam centerline, & advertised duration, you can derive the theoretical cam events.
                    I've never tried to derive the events from the @ 0.050" , but it can probably be done as well.
                     
                  • rumblefish360

                    rumblefish360 So close, yet so far away FABO Gold Member

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                    This ^^^^

                    Not exactly true but …..
                    Most calculations are done with a know advertised lift point of let’s just say @ .006. If you start running through a Comp Cam catalog, only certain cams are advertised in this way while others are at different points.
                    Now travel onto Crane Cams, Howard’s, etc….
                    You’ll find the same thing.
                     
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                    • rustycowll69

                      rustycowll69 Well-Known Member

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                      I disagree. I think it doesn't matter where manufacturer, "X", wants to start measuring duration. If they give you a recommended installed lobe centerline spec and a duration spec you can derive the events for whatever their particular method for measuring is, as long as the opening lobe profile and closing lobe profile are mirror images of each other(symmetrical about the lobe centerline).
                       
                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      Yup. An engine and degree wheel is the best cam doctor. I've found discrepancies on a lot of cam cards through the years. Some I let slide and some I sent back.
                       
                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      I don't care. It's not my cam or my dilemma. I just posted the link to the specs.
                       
                    • 70aarcuda

                      70aarcuda Master Hoader of SBM FABO Gold Member

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                      I can tell you from my experience with MP cams...all the durations @.050 are incorrect. They are calculated number
                      I have used many MP590 cams for small blocks....MP shows 265 @ .050 my degree wheel shows 271 duration @.050

                      Same with the MP557 cam....MP 252 duration....my degree wheel keeps showing 258 @ .050
                      As said put in an engine and run a degree wheel on it......only way...
                       
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