KDG LIM Porting - Page 3 - 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 03-23-2007, 07:44 PM   #21
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

Modifying the outlet of the LIM and the inlet to the head to try to negate any 'pocket turbulence' will actually disrupt the airflow and hurt performance.

This isn't from my own personal experience, but rather from research I did on the subject before I ever ported my first LIM.
willwren is offline   Reply With Quote
Old 03-23-2007, 08:16 PM   #22
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

The intake ports in the LIM reduce in cross-sectional area by over 30% from UIM to head.
If you open the port up to the size of the LIM gasket, the cross-sectional area at the outlet is still smaller than what you started with. And if you continue to gasket match the heads and taper the port back to the valve, you are still effectively decreasing port size..
In other words, if you gasket match the LIM and heads correctly, you will still be ramping up velocity but with less turbulence and more flow potential.
I can't see that hurting performance.
95naSTA is offline   Reply With Quote
Old 03-23-2007, 08:20 PM   #23
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: Brookfield WI
Posts: 121
Thanks: 0
Thanked 0 Times in 0 Posts
karldergrosse is on a distinguished road
Default KDG LIM Porting

Ag,

My g jnumber is the same as yours. Bolt holes measure .465. Am using your tear down guide from your post. It works well. Good guide. Decided to skip the knock sensor. After playing with it for a half hour I said screw it. I think I may have a major problem though. Some pics to follow.
karldergrosse is offline   Reply With Quote
Old 03-23-2007, 08:37 PM   #24
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: Brookfield WI
Posts: 121
Thanks: 0
Thanked 0 Times in 0 Posts
karldergrosse is on a distinguished road
Default KDG LIM Porting

Some pics:



There was almost NO clearance between the stovepipe and the hole in UIM
Only have 89000 miles but it was starting to weld thru. Glad I'm doing this now.



UIM off. whew... no coolant.



Now here'* my problem...........



After taking the fuel lines out of the hold down I thought I saw a hole in the line. I think it is just a nick or crease. Don't know if it was from me removing it or if it was there already. I think I'm screwed. After reading the factory service manual, it said to replace fuel line if it'* nicked or dented. I thought no big deal until I see it runs all the way back to the fuel filter. Looks like a huge PITA to replace. Is it possible to repair a fuel line even though they reccomend against it? Help!!!
karldergrosse is offline   Reply With Quote
Old 03-23-2007, 08:41 PM   #25
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default Re: KDG LIM Porting

Quote:
Originally Posted by karldergrosse
Ag,

My g jnumber is the same as yours. Bolt holes measure .465. Am using your tear down guide from your post. It works well. Good guide. Decided to skip the knock sensor. After playing with it for a half hour I said screw it. I think I may have a major problem though. Some pics to follow.
You realize it'* the height and width of the port hole in the gasket I'm interested in, right?

Thanks for the shout out on the guide...I'm using it again myself starting in about 2 hours on my wife'* 2004 LeSabre (I discovered that the newer car'* alternator is physically smaller and does not block that one LIM bolt, and that will shave some serious time and trouble!). Just remember to save the oil change for last.
agrazela is offline   Reply With Quote
Old 03-23-2007, 08:52 PM   #26
Senior Member
Posts like a Corvette
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

If that'* not a hole, maybe you could ignore it...

Maybe you could slip some 3/8 ID fuel line over it, lightly hose-clamp it to either side of the crease, keep your nostrils open, and visually check it weekly...

Or maybe there'* a way to cut and hose-barb in a replacment segment...

You'll probably want other opinions than mine on this.
agrazela is offline   Reply With Quote
Old 03-23-2007, 10:20 PM   #27
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: Brookfield WI
Posts: 121
Thanks: 0
Thanked 0 Times in 0 Posts
karldergrosse is on a distinguished road
Default KDG LIM Porting

2.018 x .983 are the port size on my gaskets. Sorry bout that.

Edit 1: How did you measure with the calipers? Did you keep one point steady and rock the other side (keeping light pressure on the thumb dial)? There is a lot of room for error.
karldergrosse is offline   Reply With Quote
Old 03-23-2007, 10:26 PM   #28
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: Brookfield WI
Posts: 121
Thanks: 0
Thanked 0 Times in 0 Posts
karldergrosse is on a distinguished road
Default KDG LIM Porting

HELP please. Anyone have advice on my fuel line problem?
karldergrosse is offline   Reply With Quote
Old 03-23-2007, 10:51 PM   #29
Senior Member
True Car Nut
 
Join Date: Mar 2005
Posts: 2,688
Thanks: 0
Thanked 0 Times in 0 Posts
dillcc is on a distinguished road
Default

Start a topic in 92-99 mechanical problems so it gets proper attention and this thread stays on topic.
dillcc is offline   Reply With Quote
Old 03-23-2007, 11:18 PM   #30
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: Brookfield WI
Posts: 121
Thanks: 0
Thanked 0 Times in 0 Posts
karldergrosse is on a distinguished road
Default KDG LIM Porting

Thanks dillc. Kinda panic'd. D'oh.
karldergrosse is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
KDG LIM porting karldergrosse Performance, Brainstorming & Tuning 5 01-08-2008 02:02 AM
General Cylinder Head Porting/ Intake Manifold Porting 101 Speedster400 Performance, Brainstorming & Tuning 6 11-07-2007 10:51 AM
KDG LIM OH SH** WTH did I do..... HELP!!!!!!!!! karldergrosse 1992-1999 83 03-29-2007 06:07 PM
Porting LIM; do any good for a Series II n/a? agrazela Performance, Brainstorming & Tuning 20 02-02-2007 02:04 PM
Black94SSEi's LIM gaskets and porting (new pics) BillBoost37 General GM Chat 27 09-18-2006 09:06 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 02:54 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.