Exhaust wrapping....Why?

[Ariel Badger]

I can see the point on a car with an enclosed engine bay but not on a bike. A two stroke maybe but on a 4T I see no point other than fashion. Please explain how this modification gains any advantage/power.
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[Lone-Wolf]

Wotcha.

On my B31 and my Bullet the downpipe is lagged - nothing to do with power gain or anything similar . . . . it's just that the chrome had gone on both pipes and I wasn't ready to spend money on something shiny. OK - I don't mind spending more for stainless - the B33 has a full stainless system.

On the Ford trike the first few feet of exhaust is lagged purely to keep the starter motor wires from getting too hot . . . . the VW has a full stainless system.
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[Nexus Icon]

As far as I know it works best on turbocharged systems on cars to lower ambient temps under the bonnet but I can't see any reason, other than cosmetic, for it on a bike.
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[cg125erinit]

To make a total minger in to something edgy and 'cool'. I use it on a cg header I cut myself to hide the horrific pitting/scratches. I don't understand why everyone hates it personally. I think it looks old skool and kinda neat on old bikes or cafes.

[Islander]

[-Matt-]

The wrap deflect solar rays, which bounce off the bikes frame, resulting in solar-charging of the entire engine. This typically gives an extra 5bhp, and also 10mpg on average.

Or the fact wrap can look better than a rusty-titanic of an exhaust.

Other than that - who knows

[Pete.]

[TheSmiler]

It makes uncool bikes look cool for example this CX500

https://i.imgur.com/3HKcVvF.jpg
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[Rogerborg]

I used it to cover up some ropey welds and make my pipe look a bit fatter (matron). Rusted the hell out of the zorst though.
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[Marmalade]

[quote="TheSmiler"]It makes uncool bikes look cool for example this CX500

For me, this cx looks shit, but that's my individual taste.
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[stoke-gaz]

To stop my exhaust ruining another pair of textile jeans.

Within an hour of picking up my new bike 8 ish weeks ago I'd managed to burn a hole through my textiles. Black wrap is going on at the end of the month.
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[dansp1]

Exhaust extractive inertia is the answer, it can in some instances give a marginal improvement in performance
I have the downpipes wrapped on my SP1 because i have relocated electrics very close to the engine and don't want to cook them too much!

[stevo as b4]

I'm not really a fan of exhaust heat wrap TBH, but on a 2stroke engine in some situations I can see the logic why you might want it for a couple of reasons.

On a 4stroke, unless it's done to protect electrics, plastics or keep heat away from the fuel tank or rider's leg I see no point. Old Café racer's look best with matt black exhaust headers and always will!

I've actually got some heat wrap on the screamer pipe on my car. The problem is that it wasn't wrapped all the way down, and it almost touches a radiator hose. I don't know if when I fit my new red coolant hoses if I should extend the wrap further down the exhaust gas exit pipe, or if I should wrap a bit of heat reflective foil tape around the coolant hose in this area?

Or am I right in thinking that If I keep driving like a pussy that the screamer pipe will never get hot enough to burn anything?

[Walloper]

It is purely insulating the heat in the exhaust gas from escaping to the atmosphere.
Some cnuts think it looks the Dog's Bollcoks/Cat's Pyjamas, some think it is boosting power.

It does two main practical things.

1) Insulates fleshy bits from hot melty bits.
2) As pits says, insulates the heat energy in the exhaustg gas from escaping to atmosphere before doing it's intended work of pushing the turbine of a turbocharger around.
It is 'purely' the heat energy of exhaust gas that we use in a turbocharged engine. The 'mechanical' effort of the engine 'pumping' gas through actually uses energy. But since there is so much heat energy going to waste in in exhaust gas it can be harnessed and used to 'supercharge' the inlet with oxygen rich air at above atmospheric pressure. And allow a T-charged engine to put out 200% Horsepower. Normally aspirated 100BHP T-charged (and aftercooled) 200BHP. Waste gates are fitted to reduce the increases exhaust gas energy that a turbo helps produce. Unlimited a turbo will blow (no pun) an engine to pieces. Or push a metal leg out the bed.
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[stevo as b4]

Walloper, are some of the Big Diesel's you work around, using free floating turbochargers?

We have various sized Gen sets for back up power at work, most of them are real old things, but they don't get much use unless there's a powercut for several hours. Some of the bigger straight 6 or V8 engines are turbocharged and most of the turbo's I've seen on our 1500rpm engines are always free floating.

I understand why you could never make a free floating system work properly on a high revving petrol engine though!

[dansp1]

Hot gases flow better, this improves the exhaust extractive inertia, on some engines (even normally aspirated ) it can give a small increase in power.

[Walloper]

[Alpha-9]

I was gonna put a bit on mine to stop them rattling against each other, pretty sure that's what's happening, overlapping new downpipes the previous owner put on, making some funky sounds, but that's about it

Doesn't it get wet and rot the exhaust?
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[lihp]

There have always been used to keep exhaust gas temperatures up by stopping it radiating to the atmosphere.

However, is it really necessary with modern materials?
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[defblade]

[Wafer_Thin_Ham]

[dansp1]

[Wafer_Thin_Ham]

[Ariel Badger]

Thank you for the replies, this started in the pub last night. My argument was that it made some sense in an enclosed space like a car engine compartment, to keep the energy in the pipe for a turbo or on a 2T. On a normally aspirated four stroke it is just pure vanity. I thought my mate was going to thump me
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[lihp]