Heatwrapping an exhaust?

15th June 2007, 08:18

Seeing as a lot of us heatwrap the manifold to increase temperature inside the pipes (thus speeding the gas flow inside), in theory; would heatwrapping the exhaust actually do anything?

15th June 2007, 08:57

Right the theroy goes that Hotter gases move quicker, the quicker the gases are removed the quicker you can get more out also I read something the other day the Hotter gases could alter back pressure and possibly increasing torque but Im sure thats only in very high powered cars.

Whether the theroy lends itself to aslittle as around the 100bhp-150bhp is anybodies guess. I done it on my Janspeed manifold more because it wqas mild steel and it was gona flake and look naff

But when I cracked my Janspeed and replaced it with a Piper I desided that I could be bothered to unwrap the Janspeed and rewrap the Piper or even buy Fresh wrap as the Piper is Stainless steel. I must admit the wrap does look good and although it still does get hot its not like cathcing your hand on a unwraped manifold!

Think it should be seen more as a styling item which could have a effect on the way the car performs rather than a item to improve performance.

Check out eBay to get heat wrap

15th June 2007, 11:46

Wrap up to the first box (presuming youve got rid of your cat) for max effect. After the pulse tuning part (first box) of the exhaust, theres not that much it actually does apart from quieten the engine.

Whether it makes much of a difference is debatable, but you know what they say about the end result being greater than the sum of its parts.

15th June 2007, 13:40

it does work but works best on full exhaust systems. the main advantage is that it reduces the temp of the exhaust and especially the manifold where it reduces temps in the engine bay. i didnt notice a difference but i only wrapped my manifold and downpipe

15th June 2007, 13:52

im wrapping mine from manifold all the way to the back box, not sure it will do much but i just want to hide the scratches etc on the center pipe

15th June 2007, 13:52

Good comments already - As said, it reduces under bonnet temperatures, and it's proven that gases can flow at a higher rate when they are hotter.

Don't wrap your exhaust though, lol. Think how manky it would get! Plus, heatwrap is heavy stuff.

15th June 2007, 13:54

i will probably just wrap the manifold and the de- cat pipe aswell, then spray it with that waterproof adhesive for the wrap

15th June 2007, 14:21

heat wrapping cuts the life down on whatever is covered becasue the heat causes pressure. so heat wraping your whole exhuast will realy cut the life line down,

15th June 2007, 14:26

ahh well nevermind ive got a guarentee haha

15th June 2007, 14:49

Quote:

Originally Posted by mallboy

it does work but works best on full exhaust systems. the main advantage is that it reduces the temp of the exhaust and especially the manifold where it reduces temps in the engine bay. i didnt notice a difference but i only wrapped my manifold and downpipe

youve got a little confused there mate, it doesnt reduce the temp of the exhaust, it just reduces the ammount of heat that it produces in the atmosphere, the heatwrap keeps the heat inside of the system which helps increase gas speed.

wrapping a manifold does the same, and this will reduce under bonnet temps which therefore will reduce the effects of heat soak.

15th June 2007, 15:00

Already got a heatwrapped manifold and downpipe that goes to the decat. Just wondered about the rest of the exhaust

16th June 2007, 03:04

plan for the weekend get my exhaust wrapped, its going to cost a few bob but fuck it.

16th June 2007, 16:43

Quote:

Originally Posted by Sparco_Tom

plan for the weekend get my exhaust wrapped, its going to cost a few bob but fuck it.

Congratulations. You've completed ignored the sensible advice given to you...

16th June 2007, 18:07

Wrapping a whole system is just plain silly!

Not only will it cost a fortune it wont make any difference to performance of the car than if youd just wrapped the manifold.

There is also a concern tha on anything under the car will be subjected to damp, and there is talk that wrap could hold damp and cause premiture corsion to your exhaust.

In short a waste of time and money

16th June 2007, 22:16

ive jst realy thought bout this and its more stupid then i 4t. the reason it helps gass flow in the manigold is that there i a risk of bounce back so they heat stops this. in the though pipe there is no were 4 it 2 bounce back. so u will end up with a rusted exhuast, out of pocket

16th June 2007, 22:19

Quote:

Originally Posted by awright

ive jst realy thought bout this and its more stupid then i 4t. the reason it helps gass flow in the manigold is that there i a risk of bounce back so they heat stops this. in the though pipe there is no were 4 it 2 bounce back. so u will end up with a rusted exhuast, out of pocket

bounce back. what are you talking about???

it helps with the speed of the gas exiting the head.

16th June 2007, 22:27

ifa manifold was flat hen went dtraight down the gases would bounce back at the valves and thn when the gases try and flow out the engine they will not be able to proberly. so manifolds are designed to let the gases flow rnd proberly. if the gases are hotter(from exhuast wrap) they canflow rnd easier.

16th June 2007, 22:27

It sounds almost like he's on about pulse tuning, but quite what that has to do with rusting an exhaust I dont know LOL

16th June 2007, 22:28

Quote:

Originally Posted by Gabbastard

It sounds almost like he's on about pulse tuning, but quite what that has to do with rusting an exhaust I dont know LOL

indeed lol!.. i was wondering if he was trying to talk about the pulses in a pissed semi unknown way

16th June 2007, 22:29

Quote:

Originally Posted by awright

ifa manifold was flat hen went dtraight down the gases would bounce back at the valves and thn when the gases try and flow out the engine they will not be able to proberly. so manifolds are designed to let the gases flow rnd proberly. if the gases are hotter(from exhuast wrap) they canflow rnd easier.

the pulses are created by the primary pipes meeting the secondary box, hence why 4-1 manifolds act differently to a 4-2-1.

16th June 2007, 22:34

yea so when there hotter they flow better out yer? so its al to do with he build of the manifold and heat helpinit flow out

16th June 2007, 22:37

Quote:

Originally Posted by awright

yea so when there hotter they flow better out yer? so its al to do with he build of the manifold and heat helpinit flow out

the heat being kept in the manifold helps with the speed of the gasflow.

the type of design of the manifold accounts to the pulse tuning of the manifold.

16th June 2007, 22:38

the rust bit was jst bout the wrap holding water. i am on bout the pulse of an exhuast

16th June 2007, 22:45

Quote:

Originally Posted by awright

the rust bit was jst bout the wrap holding water. i am on bout the pulse of an exhuast

the wrap wont cause rust if its a stainless system lol!

and what moisture headwrap does get in it can usually get boiled off.

16th June 2007, 22:58

Quote:

Originally Posted by Itsafastworld85

the wrap wont cause rust if its a stainless system lol!

and what moisture headwrap does get in it can usually get boiled off.

unless the car is left stastionary. yea heat kept in the manifoldhelps gas flow by helpin it flow out like i sed

16th June 2007, 23:10

Quote:

Originally Posted by awright

unless the car is left stastionary. yea heat kept in the manifoldhelps gas flow by helpin it flow out like i sed

and like i said about 8 ;posts before lol!

if the car is left stationary you wont get rust in a short time dude. also if the exhaust has been running so thereofre the exhaust will be hot there will not be a huge ammount of moisture left in the inner layers of the wrap.

Heat in the manifold helps the gas SPEED, hotter air flows faster, the wrap keeps the heat in the manifold itself rather than the heat dispersing into the engine bay.

this also helps prevent heat soak of the induction system

17th June 2007, 00:21

Ceramic coating the manifold is better than heat wrap, but then it does cost more.

17th June 2007, 00:28

were pretty much arguein with the same opinun. But i fink we can all say it is a watse of time.

17th June 2007, 00:32

Quote:

Originally Posted by awright

were pretty much arguein with the same opinun. But i fink we can all say it is a watse of time.

im not saying its a waste of time, im saying your getting confused because you dont know what your on about in much detail lol

18th June 2007, 12:58

Quote:

Originally Posted by Toad

Congratulations. You've completed ignored the sensible advice given to you...

haha im only messing, ive only wrapped my manifold