What are the difference between the series I and II S/C eng. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 08-17-2003, 01:30 PM   #1
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Default What are the difference between the series I and II */C eng.

I noticed there is not much aftermarket for the series I Supercharged engines.. Is there a big difference between the Gen I and Gen II? I can't seem to find any answer on exactly is different?

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Old 08-17-2003, 01:37 PM   #2
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As far as factory horsepower and torque there is a difference.

Series I 92-94 NA 170hp-225lb.-ft tq

Series I 92-93 SC 205hp-260lb.-ft tq
Series I 94-95 SC 225hp-275lb.-ft tq

Series II 95-03 NA 205hp-230 lb-ft tq
Series II 96-03 SC 240hp-280 lb-ft tq

As far as the aftermarket differnces, I don't know.
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Old 08-17-2003, 02:09 PM   #3
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They are two completely different engines really i believe. The series II is supposed to have a TRUE redline around 7k or so, but it'* limited cause the trannies won't spin that fast reliably.
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Old 08-17-2003, 02:27 PM   #4
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There are alot of minor differences between them. I think most are internal componets being slightly different between the two. The big difference is the SC on top of them. The Series 1 uses an Eaton M62 Supercharger where as the Series 2 uses a larger Eaton M90 Supercharger.

Some small pieces carry over like the thermostat but they are just too different for aftermarket parts to fit both. That said, even some series 2 in a GTP and an SSEi of the same year may not be fully cross compatable (but usually really close).
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Old 08-17-2003, 05:03 PM   #5
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THe biggest difference between say a GTP and an SSEi or a Regal etc, is things like an airbox or exhaust. Grand Prixs have very restictive exhausts, and generally airboxes too, which is why they are rated lower then ours.
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Old 08-17-2003, 07:12 PM   #6
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There is no aftermarket for the series I compared to the Series II. They changed the engine enough that most of the internals aren't interchangeable, and there are no exhausts (headers, downpipes, cats, exhausts, anything really) available. Really the only thing you can do is run a smaller pulley and open up the air intake and get a custom computer. You can do other things, just not nearly as many as you can for a Series II. The main problem with the Series I is the M62 Blower, because of this the blower has to spin faster to make the same boost meaning it has to run really small pullies, and it creates a lot of heat making low boost, and different years run different pullies also. And there is not an intercooler available for them, one would have to be custom made.
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Old 08-17-2003, 07:16 PM   #7
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If you are really interested in modding a Series I SC'd engine, talk to willwren. He has an ADTR intake, GatorBack belts, smaller pully, MagnaFlow exhaust...etc. etc etc.

Despite the lack of INTERNAL engine products for the Series 1 there is a lot you can still do, don't be to discouraged with it
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Old 08-17-2003, 07:32 PM   #8
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There are headers out...
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Old 08-18-2003, 01:26 PM   #9
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Thanks for all of the good info! I wonder if a M-90 would bolt right up to the earlier GenI but I am guessing the intakes are different also.

Headers are available in Gen I'*?? Anyone have a link to a place who sells them?

Thanks
Kevin
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Old 08-18-2003, 02:10 PM   #10
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Before you think about exhaust you should get a some basic mods down.

180 Stat
Tranny Cooler

Those two are key for insurance on the components. Then the first mod you should do is an intake. The ADTR is a great choice. Head over to the vendors forum to read about it. After you get an intake the exhaust is a good choice. You won't loose your low end torque. We don't have any off the shelf exhaust systems, but you can piece together a system and have it installed from different companies.
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