Heatwrap??

24th January 2007, 22:16

got my ss manifold and am putting it on the car on saturday at my mates garage.

is there anypoint in heatwapping it?
what does heatwrap do?
am i meant to heatwrap it?
are there any special makes of heatwrap, one to avoid?
cost?

rep for all questions answered

cheers all

24th January 2007, 22:23

hi mate, heat wrap obviously keeps too much heat from escaping as the manifolds do get REALLY HOT! which could cause your radiator to boil, and also a lot of hot air is not good for air filters/induction kits if they are gaining air from under the bonnet! larkspeed do pretty good heatwrap for around a tenner u get bout 2metres. hope that helps!

24th January 2007, 22:25

it helps kind off but i have a BMC so it wouldnt really affect that

24th January 2007, 22:31

same here, but they do get really hot! its up 2 u theres no need 2 do it but some ppl recommend it. there may be other reasons? and also if you havent already done so id suggest getting new bolts,copper nuts and gaskets 4 when u put manifold on, (bout £16 for all at citroen) the old 1s may be knacked and it also looks better!

24th January 2007, 22:33

heat wrapping prevents the engine temps rising. (air ambient temps) obviously the cooler the air the more power.

and also keeps heat inside the manifold, this heat = faster gas speed in manifold and so better performance.

24th January 2007, 22:33

also the rad wont boil that bullshit.

that could only happen if the fan was failing or the headgasget was fucked.

24th January 2007, 22:34

I heat wrapped mine with two rolls of 25 foot 2 inches wide, tenner a roll. since my manifold is s/s like yours, it was abit raspy before the wrap, so made it sound abit deeper.

24th January 2007, 22:38

Quote:

Originally Posted by Itsafastworld85

also the rad wont boil that bullshit.

that could only happen if the fan was failing or the headgasget was fucked.

exactly if the fan does fail a red hot manifold wont help matters!

24th January 2007, 22:43

Quote:

Originally Posted by carlos45

exactly if the fan does fail a red hot manifold wont help matters!

a standard manifold isnt heatwrapped

and you only need a cooling fan in stationary traffic.

plus the rad boiling wouldnt be due to manifold heat, it would be due to the fact there is no air cooling the water which is running through the engine.

24th January 2007, 22:57

Quote:

Originally Posted by Itsafastworld85

heat wrapping prevents the engine temps rising. (air ambient temps) obviously the cooler the air the more power.

i was under the impression that it makes the engine itself hotter

yey or ney?

24th January 2007, 22:57

yeah i know wot ur sayin is true but ya gotta cover all angles hey!? but basically wot were both sayin is....heat wrap it! lol

24th January 2007, 23:12

Quote:

Originally Posted by adsayer

i was under the impression that it makes the engine itself hotter

yey or ney?

what heat wrapping??

your not insulating the engine.

your insulating the manifiold itself. its meant to help gas flow as well as help keep cool air at induction due to reduced engine temps.

its why cars like the fensport corolla have a full wrapped system

24th January 2007, 23:32

yeah i was referring to the manifold... I was under the impression that it kept the EG's hotter thus improving the flow of the gases. which gives better performance.

That we're agreed on... but I'm pretty sure the engine runs hotter with a wrapped manifold as the exhaust gases keep their temp better... which therefore means that less heat energy is extracted from the engine = hotter engine

My physics might be out... But I doubt that though

24th January 2007, 23:42

Quote:

Originally Posted by adsayer

yeah i was referring to the manifold... I was under the impression that it kept the EG's hotter thus improving the flow of the gases. which gives better performance.

That we're agreed on... but I'm pretty sure the engine runs hotter with a wrapped manifold as the exhaust gases keep their temp better... which therefore means that less heat energy is extracted from the engine = hotter engine

My physics might be out... But I doubt that though

its basically to do with increasing gas speed.

no point in getting worried over the nitty gritty tbh, it will just turn into a debate.

25th January 2007, 08:27

I heat wrapped mine mate got some of ebay for £16 for 30 metres lol got quite abit left but sure i can find a use for it somewhere plus got 10 clips with it.

25th January 2007, 08:31

Quote:

Originally Posted by Itsafastworld85

heat wrapping prevents the engine temps rising. (air ambient temps) obviously the cooler the air the more power.

and also keeps heat inside the manifold, this heat = faster gas speed in manifold and so better performance.

as you said mate, thats the reason for heat wrapping !

25th January 2007, 16:59

I'm not sure on the physics of it, on the one hand you're keeping the gases hotter in the manifold, however I can't see there being much heat transfer onto the block

On the other hand if you've wrapped it properly then you'll get less heat on the bottom collector, which is right under the sump, should keep the oil a bit cooler, which will have an affect on overall engine temp.

The main reason for wrapping is to prevent under bonnet tempritures getting too high. I've never heard of it making the gases flow faster, in fact, I'm almost 100% sure they don't. In fact, in applications where the tempts don't matter that much, i.e exhausts

25th January 2007, 18:17

cheers lads, that got abit technical for me there. so yes or no?
im thinking yes at the minute

25th January 2007, 18:25

yeah do it

25th January 2007, 18:41

some manifolds can crack due to heat wrapping as it holds the heat in the manifold but i think this is only on poor quality manifolds

25th January 2007, 18:45

Quote:

Originally Posted by sim69er

some manifolds can crack due to heat wrapping as it holds the heat in the manifold but i think this is only on poor quality manifolds

is this true Mr Almighty Sayer?

25th January 2007, 19:37

Quote:

Originally Posted by CampDavid

I'm not sure on the physics of it, on the one hand you're keeping the gases hotter in the manifold, however I can't see there being much heat transfer onto the block

On the other hand if you've wrapped it properly then you'll get less heat on the bottom collector, which is right under the sump, should keep the oil a bit cooler, which will have an affect on overall engine temp.

The main reason for wrapping is to prevent under bonnet tempritures getting too high. I've never heard of it making the gases flow faster, in fact, I'm almost 100% sure they don't. In fact, in applications where the tempts don't matter that much, i.e exhausts

alex has confirmed it does aid airflow. i also remeber axsaxoman talking about this not so long ago.

25th January 2007, 19:39

Quote:

Originally Posted by Mark51

is this true Mr Almighty Sayer?

if it insulates too well then it'll nicely bugger up the manifold and gasket.

25th January 2007, 19:40

Quote:

Originally Posted by Itsafastworld85

alex has confirmed it does aid airflow. i also remeber axsaxoman talking about this not so long ago.

defo aids gas flow.

25th January 2007, 19:44

Quote:

Originally Posted by adsayer

defo aids gas flow.

hotter gas flows faster doesnt it

25th January 2007, 19:53

Quote:

Originally Posted by Itsafastworld85

hotter gas flows faster doesnt it

ayyyyyyyyyye

25th January 2007, 20:00

ive got a few pics of fully wrapped echaust systems.
may have to dig them out.

fensport corolla, r5 rally car, t16 etc...

25th January 2007, 20:01

dish them out...

25th January 2007, 20:03

gotta find em lol

25th January 2007, 21:27

In my humble opinion heat wraping is a good idea.

1. keeps the engine bay area cooler, hence lowering passive heat soak on things like the water coolant parts and more importantly the induction system.

2. it WILL aid gas flow inside the manifold, weather or not you'll actualy notice the difference would be up for debate, but, the REASON it'll aid gas flow is because hot gas is less dense and there fore can travel at a higher speed through a given diamiter pipe, BUT having said that, as the gas travels through the rest of the system it cools down, becoming denser and with a more dense gas trying to travel through the same size pipe will slow down in speed, which is where the rest of the system you have either spoils all that good work, or compliments it? in the same way that a drain pipe will flow more water than a garden hose, but we're in danger of incroaching on a whole other subject.

having said that, it must be concidered that a manifold is only one part that must be in harmony with many other parts.

Pete