Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

Purpose of epoxy on ported TB's

Thread Tools
 
Search this Thread
 
Old Nov 29, 2010 | 06:38 PM
  #1  
OreoLt1's Avatar
Thread Starter
TECH Regular
iTrader: (11)
 
Joined: Sep 2006
Posts: 405
Likes: 0
From: P'cola, FL / Okc, OK
Default Purpose of epoxy on ported TB's

I've been hunting for awhile but have not found a definitive answer to the purpose of epxoing the IAC ports while porting an LSX TB. I've heard for better idle qualities, better for shaping inner bore, etc.

I'm trying to decide whether to epoxy or not and if so what type of epxoy???
Reply
Old Nov 29, 2010 | 07:28 PM
  #2  
Zmg00camaross's Avatar
10 Second Club
15 Year Member
Photogenic
Photoriffic
Liked
iTrader: (12)
 
Joined: Jun 2009
Posts: 5,069
Likes: 51
From: Missouri
Default

Well by looking at it its just there to improve the shape of the throttle body to be more smooth and flow, and not have a larger area where air can be trapped and cause turblence. I am sure you get mixed opions on if it helps or not. And I dont know what kind of epoxy would be the best option.
Reply
Old Nov 29, 2010 | 08:25 PM
  #3  
OreoLt1's Avatar
Thread Starter
TECH Regular
iTrader: (11)
 
Joined: Sep 2006
Posts: 405
Likes: 0
From: P'cola, FL / Okc, OK
Default

Another piece of info thrown into the mix... the TB will see max boost psi of 10-12!

Found a good thread on epoxying/air flow/turbulence with and without epoxy and think I may want to epoxy but would like more input before doing so...
Reply
Old Nov 29, 2010 | 08:49 PM
  #4  
Steve Gunn's Avatar
TECH Resident
 
Joined: Feb 2002
Posts: 843
Likes: 0
From: Roseville, Ca.
Default

Make sure it's absolutley clean and scruffed before you apply the epoxy. Mine has been in there for almost 10 years. It's for a smooth transition.

Reply
Old Nov 29, 2010 | 09:18 PM
  #5  
WS6 Rampage's Avatar
TECH Addict
iTrader: (3)
 
Joined: Feb 2006
Posts: 2,498
Likes: 3
From: The dirty taint of the country. ...Los Angeles
Default

Originally Posted by Steve Gunn
Make sure it's absolutley clean and scruffed before you apply the epoxy. Mine has been in there for almost 10 years. It's for a smooth transition.

Mine is identical to yours! ... 5 years, no issues! ... I used JB Weld Auto Epoxy.
Reply
Old Nov 29, 2010 | 10:54 PM
  #6  
OreoLt1's Avatar
Thread Starter
TECH Regular
iTrader: (11)
 
Joined: Sep 2006
Posts: 405
Likes: 0
From: P'cola, FL / Okc, OK
Default

About what size drill bit are you guys using to drill through epoxy?
Reply
Old Nov 29, 2010 | 11:20 PM
  #7  
99Bluz28's Avatar
TECH Senior Member
iTrader: (35)
 
Joined: Nov 2007
Posts: 9,705
Likes: 12
From: C. V., Kalifornia
Default

That's what I used, some JB Weld Epoxy putty, and 2 pieces of 1/4" ID aluminum tube. Once the putty is completely dry I used a dremel w/sanding drums to cut down and smooth the tubes flush with the putty.
Reply
Old Nov 30, 2010 | 09:07 AM
  #8  
jimmyblue's Avatar
Moderator
iTrader: (11)
 
Joined: Mar 2002
Posts: 12,604
Likes: 7
From: East Central Florida
Default

I started off with (if I recall) a 1/4" hole but it was too
small and made for some idle surging. I opened it up to
3/8 and it got all better.

I used "good old" JB-Weld in two layers, first one worked
in with a brush (after some scuff & solvent clean) to get
a good bite, the second after it cured for fill. I put tinfoil
as "dams" at the bottom of the holes to keep globs out of
the IAC channel and the "paint" coat sealed that.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo




All times are GMT -5. The time now is 11:28 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE