Pennock's Fiero Forum
  General Fiero Chat
  worked on the exhaust manifold.

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
worked on the exhaust manifold. by Ramon
Started on: 05-05-2015 01:53 AM
Replies: 10 (482 views)
Last post by: carguy8t8 on 05-07-2015 10:32 AM
Ramon
Member
Posts: 63
From: Salem Indiana USA
Registered: Mar 2015


Feedback score: N/A
Leave feedback

Rate this member

Report this Post05-05-2015 01:53 AM Click Here to See the Profile for RamonClick Here to Email RamonSend a Private Message to RamonEdit/Delete MessageReply w/QuoteDirect Link to This Post
I took of both exhaust manifolds. I found some restriction in air flow. Not so much on the left manifold. But check out the firewall side manifold



Cylinder 2 and 4 are like this. It surprises me this passed QC.. Oh well time to get out the Dremel.
IP: Logged
PFF
System Bot
Patrick
Member
Posts: 30973
From: Vancouver, British Columbia, Canada
Registered: Apr 99


Feedback score: (1)
Leave feedback





Total ratings: 445
Rate this member

Report this Post05-05-2015 02:47 AM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Ramon:

I took of both exhaust manifolds. I found some restriction in air flow.


Yep, common knowledge in the Fiero world. It's rather puzzling why Pontiac would allow them to be built in that manner. Get rid of those obstructions and you'll gain a few ponies.

 
quote
Originally posted by Patrick in This thread:

My buddy has a Hole Saw kit (similar to what's pictured below) which includes a cutter which is the exact same size as the inside of the manifold ports.

It takes about ten seconds per port to do a perfect job! I'm not kidding. I'm surprised more people don't use this method.



[This message has been edited by Patrick (edited 05-05-2015).]

IP: Logged
tesmith66
Member
Posts: 7355
From: Jerseyville, IL
Registered: Sep 2001


Feedback score: (3)
Leave feedback





Total ratings: 135
Rate this member

Report this Post05-05-2015 12:32 PM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
Weld the flanges all the way around the tubes on the outside first (they always crack there), then cut and or grind the obstructions away.
IP: Logged
Notorio
Member
Posts: 2206
From: Temecula, CA
Registered: Oct 2003


Feedback score: (3)
Leave feedback

Rate this member

Report this Post05-05-2015 03:25 PM Click Here to See the Profile for NotorioSend a Private Message to NotorioEdit/Delete MessageReply w/QuoteDirect Link to This Post
Patrick, is there a one-off hole saw size available?? The entire set might be too pricey. Any special material the saw should be made of? Do you need a drill press with the close fit or is a hand drill still ok?
IP: Logged
Patrick
Member
Posts: 30973
From: Vancouver, British Columbia, Canada
Registered: Apr 99


Feedback score: (1)
Leave feedback





Total ratings: 445
Rate this member

Report this Post05-05-2015 03:58 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by tesmith66:

Weld the flanges all the way around the tubes on the outside first (they always crack there), then cut and or grind the obstructions away.


Perhaps the problem is more pronounced with some sets of exhaust manifolds, but when we ported mine (using the method posted above), we felt we didn't need to do any reinforcement welding. A year and a half later, all is still good.

 
quote
Originally posted by Notorio:

Patrick, is there a one-off hole saw size available?? The entire set might be too pricey. Any special material the saw should be made of? Do you need a drill press with the close fit or is a hand drill still ok?


I don't know if individual cutters can be bought, but yes, I can certainly understand why you wouldn't wish to buy a whole set just for the one size needed for this task. I don't recall the size, but the cutter fits perfectly in the manifold holes. We just used a hand drill with the manifold held securely in a bench vice. I don't believe there's anything "special" about the cutter, but the set's not mine, so I'm not all that familiar with it.
IP: Logged
dobey
Member
Posts: 11572
From:
Registered: Sep 2001


Feedback score: N/A
Leave feedback





Total ratings: 371
User Banned

Report this Post05-05-2015 04:05 PM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Notorio:

Patrick, is there a one-off hole saw size available?? The entire set might be too pricey. Any special material the saw should be made of? Do you need a drill press with the close fit or is a hand drill still ok?


Harbor Freight has a set of hole saws that should work, which is fairly cheap.
IP: Logged
Notorio
Member
Posts: 2206
From: Temecula, CA
Registered: Oct 2003


Feedback score: (3)
Leave feedback

Rate this member

Report this Post05-05-2015 05:07 PM Click Here to See the Profile for NotorioSend a Private Message to NotorioEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks guys, I will check on those. Judging by my spare set it might be the 1 and 1/8" size.

Ramon, sorry for the detour.
IP: Logged
88FieroGT TTops
Member
Posts: 700
From: Woodbridge,Va USA
Registered: Mar 2012


Feedback score: (4)
Leave feedback

Rate this member

Report this Post05-05-2015 10:43 PM Click Here to See the Profile for 88FieroGT TTopsClick Here to Email 88FieroGT TTopsSend a Private Message to 88FieroGT TTopsEdit/Delete MessageReply w/QuoteDirect Link to This Post
I used dremel tool with the oxide drum--ground all that off---car sounds great!!

------------------
Pat Jones

IP: Logged
84fiero123
Member
Posts: 29950
From: farmington, maine usa
Registered: Oct 2004


Feedback score: N/A
Leave feedback





Total ratings: 325
Rate this member

Report this Post05-06-2015 12:44 PM Click Here to See the Profile for 84fiero123Click Here to Email 84fiero123Send a Private Message to 84fiero123Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Notorio:

Patrick, is there a one-off hole saw size available?? The entire set might be too pricey. Any special material the saw should be made of? Do you need a drill press with the close fit or is a hand drill still ok?


Most hardware stores sell them singly, buy the mandrel and whatever size saw you want, so you will need to know what size obviously if you buy just one. Unless some one knows the right one wait until you measure it.

Steve

------------------
Technology is great when it works,
and one big pain in the ass when it doesn't



Detroit iron rules all the rest are just toys.

IP: Logged
Ramon
Member
Posts: 63
From: Salem Indiana USA
Registered: Mar 2015


Feedback score: N/A
Leave feedback

Rate this member

Report this Post05-07-2015 01:54 AM Click Here to See the Profile for RamonClick Here to Email RamonSend a Private Message to RamonEdit/Delete MessageReply w/QuoteDirect Link to This Post
I picked up a diamond plated grinding bit at HF today I'm going to give it a try in the morning. I'm looking forward to see if I get a decent performance increase. id like to pick up some FS headers, but man $$$$$.
IP: Logged
carguy8t8
Member
Posts: 149
From: Middlebury, IN
Registered: Apr 2010


Feedback score: (5)
Leave feedback

Rate this member

Report this Post05-07-2015 10:32 AM Click Here to See the Profile for carguy8t8Click Here to Email carguy8t8Send a Private Message to carguy8t8Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by tesmith66:

Weld the flanges all the way around the tubes on the outside first (they always crack there), then cut and or grind the obstructions away.


Be careful welding the manifolds off the head. To much weld heat can and will warp them. Trust me I know. It is my belief that the obstructions are a major contributing factor that causes the cracking therefore if you take care of the obstructions welding is not necessary unless you already have a crack. IMHO
IP: Logged
PFF
System Bot

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock