1991 Lumina Z34

[SuperBuickGuy]

I can't believe anyone would have a sense of humor living in that humidity.... good on you for it ;)

[Skeptical]

I can't believe anyone would have a sense of humor living in that humidity.... good on you for it ;)

Having lived in Florida my whole life, I don't really think about the humidity until someone brings it up. I've never had a problem with it. There is a plus side though. The ladies outfits shrink the more hot and humid it gets. You'd be amazed at how many out of state guys all of the sudden no longer have a problem with it.

[SuperBuickGuy]

Having lived in Florida my whole life, I don't really think about the humidity until someone brings it up. I've never had a problem with it. There is a plus side though. The ladies outfits shrink the more hot and humid it gets. You'd be amazed at how many out of state guys all of the sudden no longer have a problem with it.

here in the north, we use alcohol for that purpose.

[ejs262]

So let me throw another swap idea that would be pretty cool. How about the F40 6spd in the Lumina? The fiero guys are bolting that one up to their ls4 swap cars. That trans in "brand new old stock" form right now is cheap. That would be a fun driver!

Fieroguru performance makes a simple, clean starter adapter to allow the use of the F40 with the LS4,

http://fieroguruperformance.com/?page_id=1558

The TDC you removed is a neat engine, but boy are they heavy...

[Skeptical]

Fieroguru performance makes a simple, clean starter adapter to allow the use of the F40 with the LS4,

http://fieroguruperformance.com/?page_id=1558

The TDC you removed is a neat engine, but boy are they heavy...

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.

[Skeptical]

Here's a quick clip of the 3.4 Running before shutting it down for no oil pressure.

[Skeptical]

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

Before


After


Before closeup


After closeup

Intake Valve wear up close. Doesn't look that bad without the microscope.


This is what the combustion chamber looks like.


Exhaust valve seat


Piston with chunk of spark plug ceramic in it


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.


Ground valve tip

[Russell]

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

[Skeptical]

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.










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



Similar texture in this head as well.

[ejs262]

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

[ejs262]

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.

[Skeptical]

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

[Skeptical]

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.

[SuperBuickGuy]

"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.

[Skeptical]

"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.