Upper Manifold - 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 01-16-2005, 08:31 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Jan 2005
Location: Punxsutawney PA
Posts: 40
Thanks: 0
Thanked 0 Times in 0 Posts
97Bonneman is on a distinguished road
Default Upper Manifold

Ive seen many guys talking about how the upper manifold rots and will leak coolant. im looking for specific info about what this does where it happens how it happens anything to convince my dad that it would be a good idea to switch to a 180 degree t. stat anybody with anything would be great help thanks!
97Bonneman is offline   Reply With Quote
Old 01-16-2005, 08:43 PM   #2
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

All over this forum and in Techinfo.
willwren is offline   Reply With Quote
Old 01-16-2005, 08:46 PM   #3
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Where the EGR passes through the Upper mani, it erodes the wall clear through to a coolant passage. When that happens, coolant enters the intake then the cylinders. Depending on the size of the hole, it can use just small amonts of coolant, and make smoke, or large amounts of coolant and fill up a cylinder or 6 with coolant really fast and destroy piston rings or other important components of the engine.

A 180 will keep it cooler and proling life of the upper intake. There are redesigned manifolds and kits to fix the problem permanently.
J Wikoff is offline   Reply With Quote
Old 01-16-2005, 09:33 PM   #4
Senior Member
Posts like a Turbo
 
Join Date: Jul 2004
Location: Woodstock Ill.
Posts: 214
Thanks: 0
Thanked 0 Times in 0 Posts
Ranger is on a distinguished road
Default

A 180 degree thermostat will not prevent the problem. It'* the exhaust gasses from the EGR that run up through the EGR passage through the "stove pipe" that passes through the upper intake into the intake stream that burn the upper. A thermostat will not change the exhaust gas tempurature. Your only fooling yourself. The solution is to make or buy a new stove pipe that is about .100 smaller diameter OD than the OEM pipe. Then it will not contact the walls of the upper intake were it passes through. Look at the "Lower Intake Port Tube" in this link. http://ken-co.com/manifold/. I have not used this kit but I did make a new tube like the one shown when I replaced my upper.
Ranger is offline   Reply With Quote
Old 01-16-2005, 10:32 PM   #5
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

There are several schools of thought on this one. One of those is that the cooler upper plenum resulting from the cooler thermostat will prolong the inevitable, by resisting the erosion through more efficient cooling.
willwren is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Anyone tell if this is a upper control arm or an entire upper, lower, knuckle? GunsOfNavarone General GM Chat 4 11-26-2014 01:45 PM
preemptive 3800 upper intake manifold replacement helikon 1992-1999 5 07-12-2009 03:14 AM
Aluminum upper intake manifold big_news_1 Performance, Brainstorming & Tuning 11 10-23-2004 07:35 PM
Intake Upper Plenum Manifold replacement found glorkar General GM Chat 7 04-05-2004 12:25 AM
guys, advice needed..upper manifold or gasket blown srgetz 1992-1999 18 01-17-2004 12:25 PM


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 07:50 AM.


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.