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1991 Lumina Z34

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  • Skeptical
    replied
    Out with the old.... The AC was still fully charged so that's good. I should be able to just hook up the lines on the LS4 compressor and call it a day. This engine would actually have been pretty decent had they used it in a normal front engine RWD layout. All the pain in the ass parts that made me contemplate a shallow grave for the engineers was due to FWD packaging.


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    Trans coming out next and then some cleanup.

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  • Skeptical
    replied
    Did the car shuffle yesterday in between tropical storms. Since i have the week off I figure I'll yank the engine and trans out while waiting on some other stuff to be delivered.

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    Lawnmower burnouts! Yeeeeeesss.....

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    I had these sitting in the cabinet for a few years. They'd look pretty good on the Lumina. that or I'll make some rectangular/trapezoidal ones.

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  • Skeptical
    replied
    Originally posted by SuperBuickGuy View Post

    I have a truck LS2 intake... nvmd it's a 3 bolt
    Thanks for checkin'. I have a TBSS intake but it doesn't clear the alternator bracket and I think it was in the way of the power steering too. The hunt continues.... I can always run the stock ls4 intake and TB on it should I get to the point of having it running before I find something better. I saw one on ebay for around $300 but spending that kind of money on a stock intake has me shaking my head. I'm used to like 35-45 bucks at the junk yard for one. This is a budget for fun build after all.

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  • SuperBuickGuy
    replied
    Originally posted by Skeptical View Post
    Anyone know where I can find an LS2 intake for a reasonable price? Seems like everyone thinks they are solid [email protected]#$%g gold for some reason. It looks like the only one that fits when facing the stock direction and has a 4 bolt flange on it.

    Also, any recommendations on a limited slip for this beast? The GM one is again "Solid [email protected]#$%g gold" at $2k when you can find them. The engineered performance one is interesting as it looks like a normal clutch type from maybe a 7.5 diff crammed in the 4t65e diff. I'd like to get my hands on one to see if I could reproduce it easily on the cheap. Then there are those ones made up of a steel block with springs you cram into the diff. Not a fan of those.
    I have a truck LS2 intake... nvmd it's a 3 bolt
    Last edited by SuperBuickGuy; June 3, 2020, 09:20 PM.

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  • DanStokes
    replied
    Originally posted by SuperBuickGuy View Post
    "gasoline by itself will not burn; it must be mixed with oxygen in the air. If fuel burns in the open air, it produces no power because it is not confined...." buhahahahahahahahahahaha
    what a maroon (in my best Bugs Bunny voice)

    I'm only curious which of our scientists is going to stop laughing long enough to respond.... so free air is worthless, imprisoned air - now there's power there in the air

    and let's hit one more. emissions engineers couldn't care less how much fuel is consumed to make clean air. Sorry Dan, couldn't resist that one either.
    Not an engineer. That's Dave G's department. I are jest a lowly techmonician.

    Dan

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  • Skeptical
    replied
    Anyone know where I can find an LS2 intake for a reasonable price? Seems like everyone thinks they are solid [email protected]#$%g gold for some reason. It looks like the only one that fits when facing the stock direction and has a 4 bolt flange on it.

    Also, any recommendations on a limited slip for this beast? The GM one is again "Solid [email protected]#$%g gold" at $2k when you can find them. The engineered performance one is interesting as it looks like a normal clutch type from maybe a 7.5 diff crammed in the 4t65e diff. I'd like to get my hands on one to see if I could reproduce it easily on the cheap. Then there are those ones made up of a steel block with springs you cram into the diff. Not a fan of those.

    Leave a comment:


  • Skeptical
    replied
    Originally posted by SuperBuickGuy View Post
    "gasoline by itself will not burn; it must be mixed with oxygen in the air. If fuel burns in the open air, it produces no power because it is not confined...." buhahahahahahahahahahaha
    what a maroon (in my best Bugs Bunny voice)

    I'm only curious which of our scientists is going to stop laughing long enough to respond.... so free air is worthless, imprisoned air - now there's power there in the air

    and let's hit one more. emissions engineers couldn't care less how much fuel is consumed to make clean air. Sorry Dan, couldn't resist that one either.
    I always beat my air before cramming it into a confined space and lighting it on fire. It's just who I am! Accept it! Keep in mind these weren't engineering books. They are basic student level engine rebuilding books (from 93) trying to explain the various concepts in a simplified manner. The hell that is the internet fact check experts hadn't rained (reigned(?)) its terror down on us common folk yet.
    Last edited by Skeptical; June 3, 2020, 01:52 PM.

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  • SuperBuickGuy
    replied
    "gasoline by itself will not burn; it must be mixed with oxygen in the air. If fuel burns in the open air, it produces no power because it is not confined...." buhahahahahahahahahahaha
    what a maroon (in my best Bugs Bunny voice)

    I'm only curious which of our scientists is going to stop laughing long enough to respond.... so free air is worthless, imprisoned air - now there's power there in the air

    and let's hit one more. emissions engineers couldn't care less how much fuel is consumed to make clean air. Sorry Dan, couldn't resist that one either.
    Last edited by SuperBuickGuy; June 3, 2020, 12:00 PM.

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  • Skeptical
    replied
    Originally posted by ejs262 View Post
    My POS Fiero will probably get a 3.9 after I smoke the 3.5 that's in it. I don't think the mount works on a 4T80, but I cannot confirm that.
    Quotes like that ensure that your 3.5 will never break now.

    Also, I stumbled across this gem from one of my engine building textbooks from college in the 90s. My best friends son was asking about books to read to learn about how to fix cars so i went digging through some of my old books.

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    Last edited by Skeptical; June 2, 2020, 08:20 PM.

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  • Skeptical
    replied
    Originally posted by ejs262 View Post
    how are you going to post these super cool pictures without a link to said microscope?
    Ask and you shall receive brotha. Usually these china things are all the same or damn close so I buy the cheapest one I can find. I fire up VLC on Ubuntu to take the pics or video with it.

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    Last edited by Skeptical; June 2, 2020, 08:10 PM.

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  • ejs262
    replied
    Originally posted by Skeptical View Post

    That's a nice bracket. Pretty much how I would have attempted that too. I wonder if something similar would work on the 4t80. I like that style of mountig better than Furches oil pan mount. Both cool though.

    The TDC is an interesting one for sure. I'm going to stash it away for.... Well I don't really have a reason since I will not put it in anything I own. Maybe I'll make it a museum piece one day.

    I do like the GM 60 degree motors. The Lumina was originally going to get the 3.9 and a turbo until I noticed the LS4's starting to litter the junk yards for the same price.

    My POS Fiero will probably get a 3.9 after I smoke the 3.5 that's in it. I don't think the mount works on a 4T80, but I cannot confirm that.

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  • ejs262
    replied
    how are you going to post these super cool pictures without a link to said microscope?

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  • Skeptical
    replied
    Originally posted by Russell View Post
    The chamber looks really porous. How does it look with out the microscope?
    Pretty crazy right? I was a little weirded out by it. The casting itself isn't porous, Its more of the texture from the sand casting process I think. The carbon might be playing games with making it look that way too. The piston one creeps me out the most. Looks like something laid eggs in it.

    Here's some pics with a regular phone camera and some added shots of a different head. I usually smooth an rough areas in the chambers and round off any sharp edges.

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    And here is a Quad 4/ Twin cam head with a close up shot of the combustion chamber with the microscope.

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    Similar texture in this head as well.

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    Last edited by Skeptical; June 2, 2020, 04:19 PM.

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  • Russell
    replied
    The chamber looks really porous. How does it look with out the microscope?

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  • Skeptical
    replied
    Ground the valves and took some pics with a cheap microscope. Some are really interesting.

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    Before closeup
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    After closeup
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    Intake Valve wear up close. Doesn't look that bad without the microscope.
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    This is what the combustion chamber looks like.
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    Exhaust valve seat
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    Piston with chunk of spark plug ceramic in it
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    Gasket surface on head from head gasket surrounding the cylinder. According to the GM service bulletin, this doesn't need to be resurfaced. I can feel it with my finger tip but not my fingernail. I'll put an indicator on it and see how much of an indentation it is.
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    Ground valve tip
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