madkaw

L28+(maxima)47 build

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    7 minutes ago, Captain Obvious said:

    Rut roh. What do you think is going on? Spin a bearing?

    No way to know until I look . Anything is possible. 

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    On 9/24/2019 at 10:05 PM, Captain Obvious said:

    Woof. Well here's to hoping it's not serious.   :excl:

    Well - it’s serious . Weird stuff , but I will take all responsibility. #5 main journal bearing was going away quickly, which contaminated others like #6 rod. It would have to be dirt or a shavings I missed maybe. 

    The pics of #4 piston is something different . Somehow there was/is welding splatter balls in the intake runners of the head. One of these that was stuck/melted to the runner wall let loose and thus tearing up my piston , head and a valve seat on the way out . The head has been sitting around for a while , but the odds that I was welding close enough with enough splatter to fly into the runners is mind boggling- but it must of happened . Unless it happened at the machine shop and didn’t see the splatter . Just weird .

    Only good thing out of this so far is I have found no real damage from detonation running 11.5:1 . Everything is at the machine shop getting touch ups 

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    Yuck. No fun.

    I don't get the weld spatter. Anything else you think of that it could be? I mean, I gotta admit that nugget on your valve guide sure looks like a weld spatter bead, but honestly.... How? Really? Still hot enough to stick there down inside on a valve guide? Are you sure it's metal? Is it magnetic?

    I'm going to build myself a clean room when it comes assembly time.    :blink:

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    It’s magnetic . I’ve seen enough welding splatter to know that it will burn into anything. I’m usually going a mile a minute in the shop , so I must have gotten careless . Ive built a rotisserie and numerous other things while I’ve had this head . I was waiting on a cam before I buttoned it up. 

    Just bad luck. I at least salvaged the engine. Another lesson learned . 

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    Carp. Well at least you caught it before it did something unrecoverable. You must have pretty good ears to have heard that issue so early!

    Clean room... That's what I need.

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    8 hours ago, Captain Obvious said:

    Carp. Well at least you caught it before it did something unrecoverable. You must have pretty good ears to have heard that issue so early!

    Clean room... That's what I need.

    What I heard what that #5 main I believe . It hadn’t spun yet but was ready. Or - what I heard was the piston hitting the head around the damaged areas. The holes left raised areas around them on both the piston and head. There simply wasn’t enough clearance and they were slightly tapping each other as the engine heated up and things expanded. 

    Another lesson I was schooled on by my machinist. Don’t just throw new rods bolts in - ARP or otherwise without having rods re-sized a the big end. This was a budget build on the short block, but at 10$ per rod I got to cheap and that could have also caused premature wear. It was more ignorance than $$ , but don’t have that excuse anymore .

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    14 hours ago, madkaw said:

    What I heard what that #5 main I believe . It hadn’t spun yet but was ready. Or - what I heard was the piston hitting the head around the damaged areas. The holes left raised areas around them on both the piston and head. There simply wasn’t enough clearance and they were slightly tapping each other as the engine heated up and things expanded. 

    Another lesson I was schooled on by my machinist. Don’t just throw new rods bolts in - ARP or otherwise without having rods re-sized a the big end. This was a budget build on the short block, but at 10$ per rod I got to cheap and that could have also caused premature wear. It was more ignorance than $$ , but don’t have that excuse anymore .

    So your machinist is reiterating what the rebuild book says about rod bolts affecting journal roundness or shape. Interesting...

    @Captain Obvious

    Did you mic a journal and then relocate the bolts yet? :ph34r:

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    Any change in the bolts could be a change in the pilot center and cause the shells to off ever so slightly. Maybe okay for DD , but I should have known better for a performance build. 

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    No, I haven't taken any measurements off mine. I know I popped two of them out enough that they could have spun 180 degrees. I don't know for sure if they really did spin or not. And the two that popped out far enough that they could have spun were not on the same piston. So I know with certainty that both bolts are in their original positions on four pistons and at least one of the two bolts are correct on the other two pistons.

    That's all I got right now.  I ain't skeeered.    :ph34r:  Haha!!

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    I think most build you can get away with just throwing in bolts , it just wasn’t my day . And there’s no true evidence that the bolts did anything to the motor, could have been a chunk of something that ate the bearing

    What’s weird is my machinist kind of gave me a nick name of ‘lucky’. Can’t tell if he was being facetious or he was saying I’m lucky to have so little damage . 

    One of the machinists there was admiring the L’s many main journals . “ they really got that crank locked down”, is what he said . 

    Edited by madkaw

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    42 minutes ago, madkaw said:

    What’s weird is my machinist kind of gave me a nick name of ‘lucky’. Can’t tell if he was being facetious or he was saying I’m lucky to have so little damage .

    Haha! Yeah, that could go either way! And you might not want to know which way. 

    I wonder if you had welding beads flying all around enough that you got one stuck to a valve guide... Who knows where else they landed??  :unsure:

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    Well to make feel even better today my machinist told me that the rods definitely should be resized . After torque was set and measuring they were off slightly . I won’t make that mistake again - lol

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    11 hours ago, Captain Obvious said:

    You sure are "lucky"! Hope that's the last issue!!

    Oh no - I can’t be that lucky . Machinist finished up the parts and when I got home I realized he scratched the head surface with his valve seat tool. I drove home 25 miles to realize he didn’t give me the actual valve he touched up- left it in the table. Then I stared at the valve seat and realized he ground it wrong . Plus I see a huge scratch on the head surface . 
    I’m not even mad though- it was one of those days . My truck started to run bad in the way home - dying every time I stopped . 
    Can’t be mad at my machinist either . He’s 72 and nearly died a month ago from a broken stent in his leg. He’s hands shake pretty badly , but he presses on . He was finishing up the head as I waited and I think I rushed him . He feels bad and wanted me to bring it back this evening . 
    Looks like I might have to adjust my CR calculation . It will take at least 15 thou to clean this up . Maybe it will take most of the dents out too -lol. 

    Edited by madkaw
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    Oh no! I guess when it rains, huh? I'm sorry to hear about the multiple calamities.

    I don't know how to estimate what the change will be to chamber volume with a .015 shave. Are you going to measure the volume, or just guess a reduction amount?

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    11 hours ago, Captain Obvious said:

    Oh no! I guess when it rains, huh? I'm sorry to hear about the multiple calamities.

    I don't know how to estimate what the change will be to chamber volume with a .015 shave. Are you going to measure the volume, or just guess a reduction amount?

    I’m going to just RUN IT!

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    About a day away from MN/47 part 2. Just finished adjusted chain guides and tensioner to take up some slack! I gained about an 1/8” or so on the chain tensioner which meant the plunger wouldn’t be hanging out as far. I probably have about .030 removed from the total distance , so the slack was real. It actually seemed more prevalent then my L24 set up where I had as much as .050 removed.

    This time around I’m installing my newly acquired G- Force T-5 . It has a McLeod hydraulic TOB , we will see how that works . Also bought these sweet CV axles from Datsun Garage. Very nice pieces .

    This might be a whole new driving experience 😎

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    36 minutes ago, grannyknot said:

    I'm missing something, why is there so much slack on the tensioner?  That looks like a new chain, ideally you should not see the plunger at all.

    Ideally yes . It also seems odd to me and I am going to re trace my steps again tomorrow . As I said I have quite a bit shaved off the head and .005 off the block , so that would add slack. 
    Even knowing that I still scratch my head a little. I even have the shiny links to reference and I also counted pins . 

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    Back in the hole. Worked on getting my cable throttle hooked up. Pretty stoked the way it came out , pretty much invisible! So glad to be done with the linkage . I went all the way to the pedal too. Feels silky smooth. Now I can completely shave the intake if I want . 

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    Well this build is testing my endurance . Got it up and running and noticed coolant coming out the alternator bracket bolt . 

    Tore it back down to find a failed -new- gasket . Material was thin around that particular hole and I guess it wouldn’t hold. First time for that 😡

    Good news is the motor sounded nasty! My neighbors got to hear open headers for a minute - 😝 

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