Pennock's Fiero Forum
  Technical Discussion & Questions - Archive
  How necessary are the heat shields?

T H I S   I S   A N   A R C H I V E D   T O P I C
  

Email This Page to Someone! | Printable Version


How necessary are the heat shields? by zmcdonal
Started on: 03-26-2008 08:36 PM
Replies: 15
Last post by: DeLorean00 on 04-02-2008 07:08 PM
zmcdonal
Member
Posts: 1671
From: NW, Indiana
Registered: Oct 2005


Feedback score:    (9)
Leave feedback

Rate this member

Report this Post03-26-2008 08:36 PM Click Here to See the Profile for zmcdonalSend a Private Message to zmcdonalDirect Link to This Post
How necessary is the heat shield that covers the Y pipe area, and the one that is around the coil? I know that when i see a lot of engine swaps done, they do not keep the Y pipe shield, but most headers are ceramic coating or something to that effect. The heat shields on my car are pretty nasty looking, i have had the shield that goes around the trans dipstick and the tubes that blow on the alternator and coil powdercoated, and that made a world of difference. I don't know if it would look better with the one over the Y pipe and the one around the coil removed, but it was just a thought. Or should i just save up and have them powdercoated as well? If i decide to go the powdercoating route, is there a problem with driving the car without them for a while, or should i just not drive it until i would get them back and put them on? Also i don't know if this makes any difference, but i am running without a cat, which i know helps cut down on the under hood temps. Thanks.

IP: Logged
PFF
System Bot
jconnor34
Member
Posts: 494
From: morton, il 61550
Registered: Oct 2005


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-26-2008 09:35 PM Click Here to See the Profile for jconnor34Click Here to Email jconnor34Send a Private Message to jconnor34Direct Link to This Post
Necessary
IP: Logged
Francis T
Member
Posts: 6620
From: spotsylvania va. usa
Registered: Oct 2003


Feedback score: (1)
Leave feedback





Total ratings: 119
Rate this member

Report this Post03-26-2008 10:29 PM Click Here to See the Profile for Francis TClick Here to visit Francis T's HomePageClick Here to Email Francis TSend a Private Message to Francis TDirect Link to This Post
Most after market headers use larger dia pipes and a lot more of them than the simple stock headers, Even with ceramic caoting keep some of the shields. As for that coil, were's a tip, If you put it on standoffs of about and inch or two and turn it 160 degs, it will be a lot further away from the hot EGR and Y pipe. You'll need to make a few wires longer, but thats no big deal. See picture

------------------
[IMG]



Trueleo.com/fiero.htm
RSpiderII@aol.com

IP: Logged
Fierobsessed
Member
Posts: 4782
From: Las Vegas, NV
Registered: Dec 2001


Feedback score: N/A
Leave feedback





Total ratings: 147
Rate this member

Report this Post03-27-2008 02:28 AM Click Here to See the Profile for FierobsessedClick Here to Email FierobsessedSend a Private Message to FierobsessedDirect Link to This Post
I ran for 4 years with my 88 GT, no heatshielding on the entire crossover. I had to rebuild slave cylenders at a rate of once every 6 months. So yea, they are sorta important. The heat in the engine bay was pretty bad. Now days, with my 3.4 DOHC engine swap... I run header wrap on the crossover. I can touch the wrapped crossover with my bare hands for a second or two when the crossover is at full temperature. The engine bay is downright cool now. So if you don't want to run the heat shields, get some header wrap, you will be in even better shape, or use them together for some additional heat protection.

But in the end, you CAN run without the shields, but I don't reccomend it for the long run, its just way too toasty in there.
IP: Logged
jetman
Member
Posts: 7763
From: Royal Oak Mich
Registered: Dec 2002


Feedback score: (4)
Leave feedback





Total ratings: 272
Rate this member

Report this Post03-27-2008 03:18 PM Click Here to See the Profile for jetmanClick Here to visit jetman's HomePageClick Here to Email jetmanSend a Private Message to jetmanDirect Link to This Post
GM is known for being quite frugal, they wouldn't put those on there if they thought that they could save a buck without them. I sanded mine down and gave them a shot of high temp manifold paint, so far so good, been about 3 years.

If you had to make an emergency drive to the supermarket while yours were being powdercoated, probably could get away with it but I wouldn't recomend it.
IP: Logged
Indyellowgt
Member
Posts: 1950
From: Alfred,Maine,Fiero Country,USA
Registered: Dec 2000


Feedback score:    (35)
Leave feedback





Total ratings: 70
Rate this member

Report this Post03-27-2008 04:53 PM Click Here to See the Profile for IndyellowgtClick Here to Email IndyellowgtSend a Private Message to IndyellowgtDirect Link to This Post
My INDY almost burnt to the ground after I swapped in a Quad4 and tossed a few of those pieces of "Tin"
They were not the y-pipe pieces you speak of,but they are all there for a reason.

Don't do it....

[This message has been edited by Indyellowgt (edited 03-27-2008).]

IP: Logged
DEMONCHILD
Member
Posts: 515
From: FLINT, MI, USA
Registered: Jul 2006


Feedback score: (2)
Leave feedback

Rate this member

Report this Post03-28-2008 08:04 PM Click Here to See the Profile for DEMONCHILDClick Here to Email DEMONCHILDSend a Private Message to DEMONCHILDDirect Link to This Post
what bout the front exhaust header heat shield? i forgot to put mine on in the haste of geting my fiero together before my garage rental contract ran out
IP: Logged
jetman
Member
Posts: 7763
From: Royal Oak Mich
Registered: Dec 2002


Feedback score: (4)
Leave feedback





Total ratings: 272
Rate this member

Report this Post03-28-2008 10:21 PM Click Here to See the Profile for jetmanClick Here to visit jetman's HomePageClick Here to Email jetmanSend a Private Message to jetmanDirect Link to This Post
 
quote
Originally posted by DEMONCHILD:

what bout the front exhaust header heat shield? i forgot to put mine on in the haste of geting my fiero together before my garage rental contract ran out


If you're talking about the curved shield around the exhaust manifold, get that one back on there soon.
IP: Logged
DEMONCHILD
Member
Posts: 515
From: FLINT, MI, USA
Registered: Jul 2006


Feedback score: (2)
Leave feedback

Rate this member

Report this Post03-29-2008 01:28 AM Click Here to See the Profile for DEMONCHILDClick Here to Email DEMONCHILDSend a Private Message to DEMONCHILDDirect Link to This Post
 
quote
Originally posted by jetman:


If you're talking about the curved shield around the exhaust manifold, get that one back on there soon.


no i think i left that one...if not im screwed arent i?....but im talking about the one between the header an the block the mostly flat one
IP: Logged
megafreakindeth
Member
Posts: 553
From:
Registered: Aug 2006


Feedback score: (2)
Leave feedback

Rate this member

Report this Post03-31-2008 10:08 AM Click Here to See the Profile for megafreakindethSend a Private Message to megafreakindethDirect Link to This Post
not having them at all will deffinatly cool the o2 sensor down at idle to the point where you end up like me and have a rich running, otherwise good performing vehicle. larger diameter headers also cool the exhaust down because the gas can expand in the larger space. i had mine wraped but its 1 layer and my not be enough so im gonna wrap them again and test it out.
IP: Logged
jetman
Member
Posts: 7763
From: Royal Oak Mich
Registered: Dec 2002


Feedback score: (4)
Leave feedback





Total ratings: 272
Rate this member

Report this Post03-31-2008 11:13 AM Click Here to See the Profile for jetmanClick Here to visit jetman's HomePageClick Here to Email jetmanSend a Private Message to jetmanDirect Link to This Post
 
quote
Originally posted by DEMONCHILD:


no i think i left that one...if not im screwed arent i?....but im talking about the one between the header an the block the mostly flat one


Ok, I think that I know which one you're talking about. It's the large bent shield that has exhaust ports that lives between head and exhaust manifold. On both of my cars I removed it and used the high quality Felpro manifold gasket, so far so good. The ports were blown out, couldn't reuse them in the intended fashion, matter of fact, it was what nessesitated the gasket replacement in the first place.

I did save the shields, cut across to remove the blown port portion, I attached it through the bolt holes to give heat protection from the cat on my 87. I really like to keep my shields on the car as intended, however I don't have the shield on my 86, waiting until I get a cat on it, so far so good.
IP: Logged
PFF
System Bot
Steven Snyder
Member
Posts: 3311
From: Los Angeles, CA
Registered: Mar 2004


Feedback score: (2)
Leave feedback





Total ratings: 106
Rate this member

Report this Post03-31-2008 03:15 PM Click Here to See the Profile for Steven SnyderClick Here to visit Steven Snyder's HomePageClick Here to Email Steven SnyderSend a Private Message to Steven SnyderDirect Link to This Post
I removed all the heat shields and insulation when i did my DOHC swap. I routed wires and hoses to avoid hot components. The crossover pipe is wrapped in header wrap to keep engine bay temperatures down a bit. I have had zero problems and over 15,000 miles on the car. If you had a fire you put something too close to the exhaust that shouldn't be there.
Don't expect to be able to remove all the heat shields without reorganizing things a bit and making sure nothing can move into contact with a hot part. On the 2.8 this may be impossible, so leave any heat shields that are close to heat-sensitive parts you can't relocate.

------------------

1988 Pontiac Fiero 3.4 DOHC V6 5-speed
California Smog Legal!

IP: Logged
sjmaye
Member
Posts: 2447
From: Hendersonville, TN USA
Registered: Jun 2003


Feedback score:    (13)
Leave feedback

Rate this member

Report this Post04-01-2008 04:44 AM Click Here to See the Profile for sjmayeSend a Private Message to sjmayeDirect Link to This Post
 
quote
Originally posted by zmcdonal:



I don't remember seeing this on my 1988 GT. Do they also have this shielding on the y-pipe?

IP: Logged
Robert 2
Member
Posts: 2401
From: St Hubert Quebec Canada
Registered: Jan 2006


Feedback score: (4)
Leave feedback

Rate this member

Report this Post04-01-2008 06:32 AM Click Here to See the Profile for Robert 2Send a Private Message to Robert 2Direct Link to This Post
Like that for a 88

Back of the engine , transmission side

[This message has been edited by Robert 2 (edited 04-01-2008).]

IP: Logged
88 Dread GT
Member
Posts: 248
From: Canton, MA
Registered: Sep 2007


Feedback score: N/A
Leave feedback

Rate this member

Report this Post04-02-2008 06:34 PM Click Here to See the Profile for 88 Dread GTSend a Private Message to 88 Dread GTDirect Link to This Post
The Y pipe shielding and EGR tubes were redesigned for '88. The Y pipe's shielding looks more like tin foil wrap as opposed to the solid metal bolt on shielding in the '85s-'87s. The head pipe in an '88 is longer than the '85-'87 so I'm guessing the '88 Y pipes are shorter than the earlier years.

=-Eric
IP: Logged
DeLorean00
Member
Posts: 4251
From: Sacramento, CA / Reno, NV
Registered: Aug 2005


Feedback score: (2)
Leave feedback





Total ratings: 100
Rate this member

Report this Post04-02-2008 07:08 PM Click Here to See the Profile for DeLorean00Click Here to Email DeLorean00Send a Private Message to DeLorean00Direct Link to This Post
Oh crap.... I forgot about those that last time my engine was out. ::runs to the garage and begins working::

Thanks for this post I will have mine back on in a few minutes. Ugly and all. LoL
IP: Logged



All times are ET (US)

T H I S   I S   A N   A R C H I V E D   T O P I C
  

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