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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-21-2007, 11:41 AM   #1
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Default Piston question w/pics

Just had a quick question. started cleaning parts for an engine rebuild on our 92 ssei and was curious if the stock pistons had some type of thermal coating. You can see in the pictures that whatever it is goes down just past the top ring. The other spots you see on the top is whats left of the carbon on it, wasn't done cleaning yet.



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Old 03-21-2007, 12:23 PM   #2
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Supposedly from what we have understood the crown of the piston is hardened from above the second ring land groove on up.. Also the piston uses bushings( floating wrist pin ) as opposed to having a Pressed wrist pin..

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Old 03-21-2007, 12:27 PM   #3
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This is taken from http://dtcc.cz28.com/gminfo.htm. Is yours from a Series 1? Seems that it is likely the same.


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Originally Posted by dtcc.cz28.com
Special notes considering the 3800 Series II N/A and SC engines: The series II 3800 is a redesigned version of the 3800 (Series 1) V6. The Series II block has a shorter deck height, symmetrical design cylinder heads & cross-bolted main bearing caps among most of the major differences it has with it'* predecessor. The Supercharged version of the Series II engine shares the same crankshaft and heads as the naturally aspirated version but the heads on the SC version have bosses machined for injectors, and the crank is balanced differently because the SC version has beefier connecting rods and pistons. The SC pistons are also of a special casting and have a thermal coating on their tops designed to reflect heat back into the combustion process. The pistons and connecting rods used in the naturally aspirated versions of this engine are NOT designed for use with boost and are significantly weaker than their supercharged counterparts. Other differences between the N/A and SC engines are the balance of the harmonic balancer, flexplate/flywheel, and balance shaft. All 3800 Series II engines are considered to be "externally balanced".
I'll keep searching on it for a definite answer for the Series 1 pistons.
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Old 03-21-2007, 01:50 PM   #4
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Thanks for the information so far. Was just curious when I seen it on what exactly I was working with.
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Old 03-21-2007, 01:51 PM   #5
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And yes mine is a series 1
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Old 03-21-2007, 01:56 PM   #6
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Quote:
Originally Posted by pontiac scott
And yes mine is a series 1
Any possibility those are aftermarket pistons?
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Old 03-21-2007, 02:00 PM   #7
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Quote:
Originally Posted by TrueWildMan
Quote:
Originally Posted by pontiac scott
And yes mine is a series 1
Any possibility those are aftermarket pistons?
No... Those are the stockers... I have a few more pics somewhere...

* runs to dig them up *





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Old 03-21-2007, 07:50 PM   #8
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Default Re: Piston question w/pics

Quote:
Originally Posted by pontiac scott
The other spots you see on the top is whats left of the carbon on it, wasn't done cleaning yet.
It'* the teflon coating applied to the blower pistons (both factory and stock replacements)

N/A pistons are just bare castings, Series II blower pistons look the same, but also have the teflon coating going down the skirts.
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