Homemade PEMS - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 09-13-2005, 09:08 PM   #1
Senior Member
Posts like a Northstar
Thread Starter
 
Join Date: Jun 2005
Location: Yulee , FL ___ SEBF Survivor
Posts: 700
Thanks: 0
Thanked 0 Times in 0 Posts
ChaseSmith is on a distinguished road
Default Homemade PEMS

Has anyone ported exhaust manifolds on their own? I just finished porting my back manifold, I have seen many posts af people that weld their back manifold. When I was grinding, I could see smoke leaking through. Is this a necessary step, or is it wasted time. I am going to weld them anyway because I saw smoke leaking, but just for knowledge purposes, has anyone done this and not welded? Could you hear exhaust leaks?
ChaseSmith is offline   Reply With Quote
Old 09-13-2005, 09:16 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

Be VERY careful. If you get them too hot, they'll warp. The proper sequence is to stitch weld with cooling in between FIRST, then port them. That'* the way I did mine. I gained 16-20% on all ports, front and rear (all of mine are tubular, not cast, you have one of each).
willwren is offline   Reply With Quote
Old 09-13-2005, 09:22 PM   #3
Senior Member
Posts like a Northstar
Thread Starter
 
Join Date: Jun 2005
Location: Yulee , FL ___ SEBF Survivor
Posts: 700
Thanks: 0
Thanked 0 Times in 0 Posts
ChaseSmith is on a distinguished road
Default

Sweet, how much KR did it kill? Just curious.
ChaseSmith is offline   Reply With Quote
Old 09-13-2005, 09:41 PM   #4
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

Hopefully 10. We'll know more in the days and weeks to come. I had that much at WOT on a 100 day with my 2.2" pulley.
willwren is offline   Reply With Quote
Old 09-14-2005, 01:45 AM   #5
Senior Member
True Car Nut
 
Join Date: Aug 2005
Posts: 5,797
Thanks: 0
Thanked 0 Times in 0 Posts
Peterg22000 is on a distinguished road
Default

quick question then you can get back on topic...what does "WOT" mean??? ive seen lots of ppl using the term but i still cant figure it out.
Peterg22000 is offline   Reply With Quote
Old 09-14-2005, 01:52 AM   #6
Senior Member
Posts like a Corvette
 
Join Date: Sep 2004
Location: Pittsburgh PA
Posts: 1,539
Thanks: 0
Thanked 0 Times in 0 Posts
Puddy46 is on a distinguished road
Default

Quote:
Originally Posted by Peterg22000
quick question then you can get back on topic...what does "WOT" mean??? ive seen lots of ppl using the term but i still cant figure it out.
Wide Open Throttle. Pedal to the floor basically.
Puddy46 is offline   Reply With Quote
Old 09-14-2005, 10:28 AM   #7
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

Read techinfo for the jargon/acronym dictionary of terms we use here.
willwren is offline   Reply With Quote
Old 09-14-2005, 10:33 AM   #8
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

Bill...

Any ideas on the 97-99 manifolds if I have enough to bother?
BillBoost37 is offline   Reply With Quote
Old 09-14-2005, 10:36 AM   #9
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

No idea without looking and measuring. Measure the ID of the manifold, particularly if the OEM weld is on the INSIDE of each port. Meausure the ID of the exhaust port in the heads. If head port>EM port, then port!
willwren is offline   Reply With Quote
Old 09-14-2005, 11:20 AM   #10
Senior Member
Posts like a Northstar
Thread Starter
 
Join Date: Jun 2005
Location: Yulee , FL ___ SEBF Survivor
Posts: 700
Thanks: 0
Thanked 0 Times in 0 Posts
ChaseSmith is on a distinguished road
Default

Finished porting the rear last night, sent them off to get welded by my friend. His welds look like a row of dimes overlapping each other, not blobs of material like mine, so hopefully they will look professionally done. Next step is header wrap or jet hot. I would prefer not to wrap them because of potential hot spots. If the $$ is right I will get them coated with jet hot. My swap has spun out of control, and I am fearing that I might go over budget, oh well, it'* a hobby right.
ChaseSmith is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
homemade air intake opensourceguy 1987-1991 8 06-04-2004 07:49 AM
Gratuitous engine shots, and homemade intake. J Wikoff Your Ride: GM Pictures & Videos 4 05-29-2004 01:36 PM
homemade intake opensourceguy 1987-1991 1 05-17-2004 10:15 PM
Homemade ScanTool PontiacDad Performance, Brainstorming & Tuning 4 10-06-2003 02:59 PM
What have you used for homemade CAI parts?? brminder Performance, Brainstorming & Tuning 9 04-10-2003 07:50 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 06:29 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.