Aluminum plenum on a Series II? - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-24-2005, 06:36 PM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Oct 2005
Location: Shiner, Texas
Posts: 120
Thanks: 0
Thanked 0 Times in 0 Posts
jessie_harbin is on a distinguished road
Default Aluminum plenum on a Series II?

Is it possible to place an aluminum plenum for a 3800 Series III V6 onto a 3800 Series II V6 engine that has the plastic one?

97 Bonneville SE 251K
jessie_harbin is offline   Reply With Quote
Old 11-24-2005, 06:37 PM   #2
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

I do not know that anyone has found anything but the plastic composite available.
BillBoost37 is offline   Reply With Quote
Old 11-24-2005, 06:40 PM   #3
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Oct 2005
Location: Shiner, Texas
Posts: 120
Thanks: 0
Thanked 0 Times in 0 Posts
jessie_harbin is on a distinguished road
Default Re: Plenum

Thinking of pulling one off of a Buick La Cross 3800 Series III [email protected] junk yard (car looks sad, being that its new and was flipped). They want $50 for it. They look the same.
jessie_harbin is offline   Reply With Quote
Old 11-24-2005, 07:13 PM   #4
Senior Member
Certified Car Nut
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
I do not know that anyone has found anything but the plastic composite available.
quite incorrect.... the Series III alum upper will work with the Series II....there is a catch...you will need to find a way to mount the TB since it is electronic on the Series III....other than a TB adapter is a bolt on
1993 SLE is offline   Reply With Quote
Old 11-24-2005, 07:32 PM   #5
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

There are a few catches with converting to the L26 UIM. You'll loose the PVC system since it differs between the manifolds, and I'm not sure if the IAC valve will work. I've also read about the L36 egr stovetop not fitting in the L26 UIM. You'll also have to drill and tap some of the openings in the L26 UIM to make it work.
In terms of performance a L36 throttle body(no matter what kind of adapter you use) will not flow nice with the L26 UIM opening. Heres why:
L36 UIM:

L26 UIM:

A Series 2 L67 throttlebody would work better since it has a round outlet close to the size of the L26. But some tuning may have to be done.
If your main concern is UIM failure, just drill and tap the coolant holes in the LIM and don't worry about it.
95naSTA is offline   Reply With Quote
Old 11-24-2005, 07:53 PM   #6
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Oct 2005
Location: Shiner, Texas
Posts: 120
Thanks: 0
Thanked 0 Times in 0 Posts
jessie_harbin is on a distinguished road
Default re: =-(

Well in that case I'm not even going to bother buying the plenum. I recently replaced this one about a month ago any way so I won't bother. Besides the car has 251,000 miles on it. I don't think putting on an alumium intake plenum will make this engine last any longer then my plastic one. Thanks guys for your help on this and saving me the trouble, AND a $50 mistake.
jessie_harbin is offline   Reply With Quote
Old 11-24-2005, 10:42 PM   #7
Junior Member
 
Join Date: Mar 2003
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
vital49 is on a distinguished road
Default

Look in the for sale section on clubgp.com. You'll find some poeple who have made the L26 UIM work on an L36. Most of the guys over there are trying to get ~$300 for a used one.

I don't think anyone here has tried it....yet. I know mkaake was working on an adapter, but I haven't heard how his progress is coming along...
vital49 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Series 3 plenum on a series 2 engine? GMCSonoma 2000-2005 11 09-19-2006 06:42 PM
Updated Series II aluminum LIM Gasket Number Archon General GM Chat 2 09-01-2006 09:53 AM
Aluminum Frame LIM gaskets for Series II pix (56k warning) bill buttermore 1992-1999 38 04-12-2006 02:34 PM
Cleaning Series I Plastic Plenum. dougworner 1992-1999 8 03-19-2004 02:29 PM
Plenum gasket mdgard 1992-1999 0 12-21-2002 10:56 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:09 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.