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1991 Lumina Z34

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  • Skeptical
    replied
    I've been lacking motivation lately but managed to get out there and knock out a few things.



    Wire wheeled the goo off the subframe to paint it.
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    First coat.
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    Done. Not perfect but then again I wasn't going for perfection. Much better than it was though.
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    i was surprised at how little paint was actually in the engine compartment. I guess Gm was saving pennies by lightly misting some color in there.
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    Primed.
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    Painted.
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    I'll just spend 5 minutes and roll this around to the shed so I [email protected]#$...... Caught a pebble at speed and went for a tumble. Oh well. Just made the front pulley D shaped.
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  • Skeptical
    replied
    I'm mildly drunk and channeling my inner 20 something...

    I removed the gravy serving dish from the subframe...
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    Not installing a 3800 or "Other" so should be fine....
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    Look at that margin difference on the exhaust valve. Left is a melling stock replacement. Right is a stocker with one grind on it. The left one disgusts me.
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    smidge too high...
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    dead f'n center. A 30 on top and a 60 on the bottom of the seat to narrow it up and we are good to go!
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    Aftermarket valve with no back cut
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    Stocker with the back cut.
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  • Skeptical
    replied
    The word for the day is concentric. I'll use it in a sentence. The factory machining process gives zero F's about the exhaust seats being concentric to the valve guides.....

    I got two more to square up and then I'll be onto the intakes. I already touched them with the stone and they cleaned right up so it should be just setting the width on those.


    Spot checking exhaust seat width at .075. There's a slight optical illusion there where the seat meets the head. It's just stock angles of 30/46/60.
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  • DanStokes
    replied
    Any port in a storm?

    Dan

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  • SuperBuickGuy
    replied
    and just like that, we knew you were one of us

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  • Skeptical
    replied
    I told myself I wouldn't... Then I was like, just one more port...... Just one then I'll quit....


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  • ejs262
    replied
    Originally posted by Skeptical View Post

    Casting is on the list of things to try too! You'll have to share some of the things you make once you get your printer going.
    yeah, once I get the printer together, I'll need to get the foundry setup and ready to go. I think my current plan is to submerge the prints in plaster, then burn the plastic out, then pour metal.

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  • DanStokes
    replied
    That IS a skinny little thing!

    Dan

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  • Skeptical
    replied
    Did a little cleanup on the car this past weekend.

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    Needs a little more scrubbing on the subframe to get the rest of that factory goo off. I suppose I'll paint the engin compartment too while I'm at it. I wasn't going to but what the hell.
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    Naturally it started raining once I moved it outside.
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    Did I mention the car has a hitch? It's like it's whispering ,"Take me to drag week..."
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    Factory wussy exhaust will not harm anyone ever again.
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  • Skeptical
    replied
    Originally posted by ejs262 View Post
    3d printers are awesome! I need to finish putting mine together so I can start prototyping stuff. I've drawn up intake manifolds, shifters, brake caliper adapters, and all sorts of other stuff. My plan is to use my printer to develop molds to sand cast parts with, for parts that need more durability than a printer can typically provide.
    Casting is on the list of things to try too! You'll have to share some of the things you make once you get your printer going.

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  • ejs262
    replied
    3d printers are awesome! I need to finish putting mine together so I can start prototyping stuff. I've drawn up intake manifolds, shifters, brake caliper adapters, and all sorts of other stuff. My plan is to use my printer to develop molds to sand cast parts with, for parts that need more durability than a printer can typically provide.

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  • Skeptical
    replied
    Got the heads resurfaced the other day. More for piece of mind so I wouldn't sit up at night wondering if should have done it. i also got a spare intake and exhaust valve to take some measurements on. these aftermarket stock replacement valves are crappy when it comes to flow. I'll take some side by side pics. they don't do the back cut on them like the factories. I am surprised at the margin on the intake valve. It's so tiny. I still need to grind the seats then start putting them back together. Then it will be on to the transmission build.

    Must... resist.... urge.... to... port........

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    4 inch downpipe technically fits but 3.5 is probably what I'm going to use. That will give enough room for the wrap and thermal stuff to work properly.

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    Got some transmission ports in. I ordered the 37 tooth gear and for some reason they sent me two and a stock input shaft. Weird.... I also got the supposedly stronger input shaft, pump drive and 33 tooth driven gear. That should keep me at the 2.93 final drive ratio but with the single chain instead of the two smaller ones.

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  • Skeptical
    replied
    Originally posted by SuperBuickGuy View Post
    I've struggled to find a drafting program that makes sense to me.... most have this very steep learning curve or start somewhere where it makes little sense (e.g. "how to save your files" - 5 videos in, I still can't draw a line but lord if I ever do, I can save it in 20 different ways)....
    Sounds about right. Most of my time was spent trying to put a hole in a cylinder. Every video showed a different way that i couldn't get to work. Eventually I found that you had to be in a certain "Workbench" and have certain things activated (Which does make sense) to get the ability to poke a hole in stuff. I'll get the hang of it. Maybe i should make some videos once I figure it out and try to relay that information to people like us. you'll learn a 21st way of how to save a file that way.

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  • SuperBuickGuy
    replied
    I've struggled to find a drafting program that makes sense to me.... most have this very steep learning curve or start somewhere where it makes little sense (e.g. "how to save your files" - 5 videos in, I still can't draw a line but lord if I ever do, I can save it in 20 different ways)....

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  • Skeptical
    replied
    Have tools, will make stuff. I needed some plugs to seal up the transmission... So I drew some up and printed them out. I really need to start using CAD more often so I can get efficient at it (that was why I bought the printer after all). It took me a little over an hour of fumbling around through tutorials and piecing together what I needed to do. I'll be happy when simple designs like this take me 5-10 minutes.



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