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Old 04-24-2003, 23:17   #1 (permalink)
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Heat shields for header/extractors.. a must??

Got my extractors and 2.5" exhaust fitted to my EF2 today, but a heat shield wasnt fitted. Just wondering if they are needed or not. And what is best type &where from &how much$$??

Also got a standard exhaust fitted to my other car, and the heat shield wasnt replaced either.. Should i go back and get it??


Any info would be great

Jase
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Old 04-25-2003, 00:46   #2 (permalink)
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yeah go back and make them fit it.
It may look better without but extractors can glow if your car is thrashed enough and I wouldn't want to risk burning wires and hoses.
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Old 04-25-2003, 02:09   #3 (permalink)
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never heard of extractors glowing under normal conditions...only time I have heard this may happen if the cat is completely blocked.

I made a heat shield out of a 'NO STOPPING' sign....just bent one end at a 60 deg angle, drilled a few holes and held it in place with two exhaust clamps....cost me about $2 and a half hour to do...

going by radiant heat in the engine bay, it was no where near as severe when the shiel was on.
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Old 04-25-2003, 03:50   #4 (permalink)
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I've had my extractors glowing.
Didn't have a lighter so I thrashed my old XE till I had enough heat to light my smokes. I was a hero.
Good thing I quit smoking!
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Old 04-26-2003, 12:40   #5 (permalink)
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No need for a heat shield with extractors as they run cooler than the cast iron manifold.
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Old 04-26-2003, 13:08   #6 (permalink)
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actually that will depend on the extractors that you are running. Most aftermarket extractors now are jet hot coated. This allows for better heat protection in the engine bay. If they are not a coated set you can run into issues with them glowing hot and melting items near them.

I have experienced that myself in the Impala. Had full length extractors on the car. They were jet hot coated and still glowed red/orange. Melted the ac compressor lines and cooked my brake fluid that was in lines over 20cm away. I wrapped everything from plug wires to brakelines and put up the shields and after i did that I had no further issues.

Better to be safe than sorry.
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Old 04-26-2003, 15:33   #7 (permalink)
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Jase,

if ya worried then get some header wrap - I don't know how expensive it is, or just get some metal bent up at a fabrication shop.. I don't think the old header shield will fit over extractors..

Dan..
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Old 04-26-2003, 20:48   #8 (permalink)
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My extractors are not heat coated, and I find that they do heat up the entire engine bay noticeably more then the stock manifold ever did, and yes they did melt a few wires when they first went in.

I have had a shield on the way for about 2 years now, but im too slack to finish it off.
IMO, the car would be better off with a heat shield.. and better still, heat tape wrapped headers.
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Old 04-27-2003, 00:04   #9 (permalink)
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Cheers,

Ill have a fiddle on the weekend, and get the standard shield put back on my other car.

-Jase
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previous rides;
1st car EA Fairmont Ghia, extractors, exhaust
2nd EF GLi, 'custom' interior, extractors, exhuast
3rd EA Fairmont 5spd, low'd, extractors, exhuast, head
work, 3.45LSD, EL dash, interior+ El ECU
4th EB2 Fairmont, EL dash and interior, BBM, LSD etc etc
5th EB Fairmont Ghia 5L. All leather, lowered, exhaust etc
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Old 04-27-2003, 02:18   #10 (permalink)
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Quote:
Didn't have a lighter so I thrashed my old XE till I had enough heat to light my smokes. I was a hero.
HAHAHAHAHA mate i would have paid to see that!!!!

yeah i dont think i have ever got my extractors to glow, but it got hot enough under there at one stage to melt the siren for my alarm, that really sucked :(

a have had the first 1/3 of the stock exhaust system glowing red on a 'moon buggy' shape tarago before, that was an effort :)
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