What is wrong with this picture?

Discussion in 'Mopar Performance Issues' started by IQ52, Feb 3, 2018.

  1. IQ52

    IQ52 Well-Known Member

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    So like the stupid thing just shuts itself off on the dyno?

    351W Ford    2011Engine Challenge 083.jpg
     
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    • Daves69

      Daves69 Well-Known Member

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      .....
      upload_2018-2-3_11-21-18.png
       
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      • ChrisRomello

        ChrisRomello Well-Known Member

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        Nice crack! Crack kills!
         
      • d55dave

        d55dave Well-Known Member

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        Ouch...... that hurts
         
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        • Dfr360cuda

          Dfr360cuda Well-Known Member

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          Cracked block ?
          Or
          Shrapnel ?
           
        • Bad Sport

          Bad Sport HALF A BUBBLE OFF Staff Member FABO Gold Member

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          I see both.

          Hydroloc??
           
        • rumblefish360

          rumblefish360 so close yet so far away

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          OH WOW!
           
        • IQ52

          IQ52 Well-Known Member

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          AND where do you suppose that sneaky little exhaust valve head went to?

          351W Ford    2011Engine Challenge 084.jpg
           
        • RAT ROD AL

          RAT ROD AL FABO Gold Member FABO Gold Member

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          Shoulda bought the extended warranty I guess. LOL bummer
           
        • TrailBeast

          TrailBeast Slightly Twisted Member

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          I'd bet it went over to the pistons house and they both went to visit Mr. oil pan.
          That sucks man.
          Do you suppose all those chunks in the valley came out through that crack?
          Looks like it.
           
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          • Max1196

            Max1196 Well-Known Member

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            Chev Orange. Does it every time!
             
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            • IQ52

              IQ52 Well-Known Member

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              The valve head didn't make it all the way to Mr. oil pan like the piston.

              Those chunks? They did come through the crack. Before the head was pulled you could see the cam and lifters through the exhaust port.

              This is sorta what happens if you put big valves in a 915 head, put them on a 361 block, and don't check carefully enough to see if the valves are going to hit the cylinder walls. There were divots at the tops of the deck of every bore where the valves were hitting.

              I'm trying to remember correctly but it seems like it was still making well over 500 HP when it let go.
               
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              • IQ52

                IQ52 Well-Known Member

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                The valve head? They found it down in that hole into the water jacket.

                351W Ford    2011Engine Challenge 081.jpg

                There wasn't any cylinder wall remaining on the cam valley side of the engine.
                351W Ford    2011Engine Challenge 080.jpg
                 
              • Mopar Tim

                Mopar Tim FABO Gold Member FABO Gold Member

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                It'll buff out! JB weld to the rescue!!! Damn...bummer.
                 
              • TrailBeast

                TrailBeast Slightly Twisted Member

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                Yeow, that sucks.
                I hate to ask because I don't want to come across like I never screw up:D but how did it not occur to you that the valves might hit?
                 
              • IQ52

                IQ52 Well-Known Member

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                Sah good question! It's kinda like this, I didn't build that engine.

                We were over fiddle-farting with our engine.........


                351W Ford    2011Engine Challenge 074.jpg


                ..............and we hear a WHUMP over from Comp Cam's dyno room. I took those pictures as they tore the engine down.

                With ours, the only problem we had was they forgot to turn the water into the engine before they fired it. I was looking at the dyno control panel thinking something is wrong, when the engine made some weird noises and the operator shut it down. Eight exhaust valves stuck to the bronze guides and the guides were moving up and down in the 906 heads with the valves.

                351W Ford    2011Engine Challenge 092.jpg

                My boys on the left and their cousin on the right in Comp's dyno room. After some repairs it made 730 HP.
                 
              • toolmanmike

                toolmanmike FABO Staff Staff Member FABO Gold Member

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                Looks like a clear case of "Unscheduled Engine Disassembly" ! Yep, I'll bet that's what it is.
                 
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                • famous bob

                  famous bob mopar misfit

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                  Interesting on the h.p. Whats the engine got in it? would like to compare it to mine. Thinking 723 here. Really sucks on the small block !!
                   
                • DFX 340 Duster

                  DFX 340 Duster FABO Gold Member FABO Gold Member

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                  Interesting!
                  My first Mopar had a 361 motor in it. I did everything to it that most people did to their 383s in those days (484 purple cam, Edelbrock DP4B intake, Carter AVS from a 440, windage tray, headers, open element air filter, Accel dual point distributor) and it really woke up. My Mopar buddies told me about the potential valve clearance issues if I went to the 915 or 906 heads and tried to run big valves.
                  I ended up rebuilding the original heads with the same size valves.
                   
                • WoodenNickle

                  WoodenNickle Just Damn.....

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                  A little JB Weld will fix you right up.
                   
                • cuda620

                  cuda620 Well-Known Member

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                  451 or 470?
                   
                • IQ52

                  IQ52 Well-Known Member

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                  Aside from what you see on the outside? Lesse, 56% leakdown with 15 bent valves. Cranking over it would spit back through the carburetor and we couldn't throw enough ignition advance in it to keep the exhaust pipes from glowing red. Nothing much else, 93 octane Sunoco, 11.9:1, our ported 906 heads, Erson solid roller around 278/280 @ .050 and about .800' lift or 280/288 and .780" (probably the later, hard to remember for sure, it was 2011 and I had both cams in my possession), Harland Sharp rockers, Ford blue paint.

                  It made 748 HP at home on 91 octane, with so much blowby it pegged the meter. We changed the ring pack and were breaking the engine in on Comps dyno when the valve guides seized.

                  Two votes for JB weld I see.
                   
                  Last edited: Feb 3, 2018
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                  • IQ52

                    IQ52 Well-Known Member

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                    The 451 made 723 on Comp's dyno and 787 a few weeks later. We felt like this 500 could make close to 800 before it got toasted. The short block still sets in an AREngineering engine dolly beneath the shops electrical fuse panel. One just never knows, does one?
                     
                  • cuda620

                    cuda620 Well-Known Member

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                    We all learn from what you do or see...
                     
                  • dukeboy_318

                    dukeboy_318 Our Lives, Our Fortunes and Our Sacred Honor. FABO Gold Member

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                    I thought you'd given up the engine building gig?