what are these sleeves on his header for?
sorry for the noob question

 

It's called header wrap. It keeps the heat within the header so that the engine bay (engine) doesn't get hot. Too hot of an engine decreases performance.

 

its also supposed to increase the volocity of the exhaust.

 

and cut the life of your headers buy half .

 

is it really so detrimental tot he headers?? cause my engine bay gets way hot.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mkazm83 &raquo;</TD></TR><TR><TD CLASS="quote">its also supposed to increase the volocity of the exhaust.</TD></TR></TABLE>

Oh, really? I never knew that! The hotter the exhaust chamber, the more rapidly the exhaust gases move? Is that the concept?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AndyD &raquo;</TD></TR><TR><TD CLASS="quote">

Oh, really? I never knew that! The hotter the exhaust chamber, the more rapidly the exhaust gases move? Is that the concept?</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92h22alude &raquo;</TD></TR><TR><TD CLASS="quote">and cut the life of your headers buy half .</TD></TR></TABLE>

Is that because moisture gets inside and corrodes them more quickly?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The_Head &raquo;</TD></TR><TR><TD CLASS="quote">

Is that because moisture gets inside and corrodes them more quickly?</TD></TR></TABLE>

I would think the opposite occurs. The higher temps causes the welds to crack.

I would think it would not affect the better made headers though. But that's just a guess.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The_Head &raquo;</TD></TR><TR><TD CLASS="quote">

Is that because moisture gets inside and corrodes them more quickly?</TD></TR></TABLE>

also the high heat.

 

Would a dc header be able to withstand the heat fine? id love to use some cause i think it'd really cool down the temps of my engine bay
or is there a better way to cool dwn the temp of the engine bay?

 

It should hold fine for about 2years but all this depends on were u leave.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AndyD &raquo;</TD></TR><TR><TD CLASS="quote">

Oh, really? I never knew that! The hotter the exhaust chamber, the more rapidly the exhaust gases move? Is that the concept?</TD></TR></TABLE>
Its a fact. Also its not going to hurt a stainless header but it might cause ceramic headers to crack due to them getting too hot.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92h22alude &raquo;</TD></TR><TR><TD CLASS="quote">It should hold fine for about 2years but all this depends on were u leave. </TD></TR></TABLE>
What does where you live have anything to do with whether they are going to last?

 

different climates....

 

A vented hood also helps to decrease under-hood engine temperatures.

 

I have a stainless DC that has had header wrap for 5 years and 40k miles (about 500 of which were on the race track). I don't know how I could get it hotter than WOT down the front straight on a 100 degree summer day, and no problems so far. Mild steel headers or turbo setups may fare worse...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mkazm83 &raquo;</TD></TR><TR><TD CLASS="quote">
What does where you live have anything to do with whether they are going to last? </TD></TR></TABLE>

the more humid the worst. Humidity gets suck in between and starts to rust it out. Miami very humid Utah not so humid.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flyrod &raquo;</TD></TR><TR><TD CLASS="quote">I don't know how I could get it hotter than WOT down the front straight on a 100 degree summer day, and no problems so far.</TD></TR></TABLE>

probably only after you pull off and are driving 10mph through the pits....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sober_John &raquo;</TD></TR><TR><TD CLASS="quote">

probably only after you pull off and are driving 10mph through the pits....</TD></TR></TABLE>

There is a cool down lap. It helps a lot.

 

if your header has a quality coating or is stainless wrap wont ruin it....

and i have to question the hotter is better arugement....there is no way that is right....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">and i have to question the hotter is better arugement....there is no way that is right....</TD></TR></TABLE>

Why do you think it isn't right?

Molecule move around more rapidly as they are heated.

Just curious why you argue against it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">if your header has a quality coating or is stainless wrap wont ruin it....

and i have to question the hotter is better arugement....there is no way that is right....</TD></TR></TABLE>

if you questioning keeping the exhaust gases hot then the reasoing is simple, as soon as the exhaust exits the head at a high velocity it immediately starts to cool, when gases cool the shrink and take up less space. hence the exhaust gases now have more room so the volcity drops because now the area hasn't changed.

if you can keep the gases neear the head hot the will move away quicker , helping with scavenging of the cylinder and creats less back presure.

edit: its especially helpfull for a turbo car.. god damn my manifold was one large head sink , it killed under hood temps, after i wraped my underhood temps went down and i noticed and increase in spool time

 

thanks tom....i stand corrected...and then i sit down...

my legs are tired from standing corrected so much

 

http://www.thermotec.com/products/full/full.html

i got all the info i needed here than got my **** on ebay. i recomend GENERATION II COPPER HEADER WRAP with HI-HEAT COATING this has made a huge difference on hot summer days
like you would not believe.