just been looking on flea bay and seen some exhaust wrap.Can any one tell me what is the point of this stuff apart of making your bike look like a piece of shit
it increases performance by increasing the temperature of the exhaust gasses in the pipes as it reduces cold air taking heat away from the metal etc. Higher temperature means higher pressure which causes the gases to be drawn quicker to the area of low pressure (the cold air out the back of the can)
This is weird. I saw the same thing myself last night and thought exactly the same as you. Laughed to myself when mention was made of "giving your bike the retro look!" FFS. :roflmao:
Each to their own but i love this http://www.motographite.com/2012/06/yamaha-xjr-1300-dark-wisdom.html
I'm with you Moz, looks good on some bikes but just looks stupid and scruffy on others, streetfighters suit it I reckon. If and when I get a new exhaust for mine I'm thinking about this: https://www.google.co.uk/search?q=c...s%2F290431%2F693366.html%3F1349804885;550;413 No more worries about corrosion.
An insight into calculating an engines power output: Calorific value of fuel is calculated. Ambient air temperature measured. Temperature of coolant measured. Engine temperature measured. Exhaust temperature measured. All these values are used in a formula to calculate the engine power output (I can't recall the specific I formula as it's been many years I was last in a thermodynamics class). Wrapping the exhaust would give a lower exhaust temperature, thereby producing a result from the formula which would indicate an increase on power. Now for the logic...energy is neither created nor destroyed, but converted from one form into another. Simply put, the calorific content of your fuel is converted into engine power, heat and noise. Now that your exhaust is wrapped (and you measure a decrease in heat on the exhaust, which theoretically equals an increase in horsepower), where does the heat go? Has it been converted into extra horsepower? Personally I believe it is expelled through the open arse end of your exhaust and adding additional heat strain to the remainder of the exhaust system. I imagine the wrapped parts of the exhaust would see an increase in metal temperature (internally) during operation as they are no longer cooled by cool air rushing past. Not least forgetting that the wrap could provide a perfect area for condensation pooling when the bike has cooled, leading to accelerated corrosion What do Formula 1 cars use? What do MotoGP bikes use? Ceramic coatings? Any experts out there to pass comment?
Ha ha ha Moz Personally I think it looks splendid on period bikes or cafe racers, but I wouldn't tout any horsepower gains
im no expert of course, just scientifically minded.... I don't know the specifics of combustion engines, but the way I understand it is that the act of increasing the exhaust gas temperature by insulating the pipes to reduce convection with the surrounding air - makes the engine run more efficiently due to less energy lost through heat.. that lower heat loss means more energy is held by the particles in the exhaust gases. that increase in energy is what is increasing the pressure of the gas, causing the gases to evacuate out the back of the exhaust at a higher speed to the area of low pressure.this leaves more room for newly created gases to take its place. heat going out of the arse end of a pipe instead as you put it is exactly is exactly what the advantage is! to simplify the whole process, if we look at it in the process of a pulse jet. a pulse jet is started by accelerating the air past the area of combustion which then pulls the charged particles created by combustion in the same direction - replacing the area with more air and so on so it becomes a continues motion and keeps itself going. a turbo can be applied to a pulse jet to increase the exhaust speed. the increase in exhaust speed means the air used for combustion is cleaner as less exhaust gass is present in the combustion chamber as it is evacuated faster. more combustable air = more power which is exactly what things like turbos and superchargers are intended for as they feed more air into the engine meaning a bigger bang and more power. the act of wrapping will obviously not have anywhere near as much power gains as fitting something like a turbo, but any increase in efficiency will theoretically have power gains. formula one cars insulate the engine parts In a more technological way. Most likely ceramic coating as you say or a similar insulating material. on motogp bikes and bikes in general i doubt the power increase would outweigh the weight increase of the coating/wraps. exhaust wrapping I see as a poor mans way of emulating the science behind the process.... chances are it will end up more costly though as wrapped pipes are more prone to cracking due to the stresses and heat.
Bought this for my RVF, most of the exhaust system isn't on show so not really arsed about looks but the theory works. Just remember to start at the back And wrap forwards to the headers. I'll post a photo of mine in a few days when it's back on the bike. But here's one I found earlier;
yes but isnt it going to get wet and cause a speed up in corrosion or condensation both of wich will kill your bike
This stuff was used in F1 cars a (quite!) a few years ago, before they started on ceramic coatings etc. Originally, it was to insulate the hot exhausts to protect mechanics, but there was the added bonus of hot gases travel faster than cold gases, so the exhaust gases can be expelled quicker. (Useful at the kind of revs F1 cars run at.) From there, it progressed to other forms of Motorsport where you want to try and keep your under bonnet temperatures down. This helps with keeping inlet temperatures down so you gets denser charge (more oxygen, so more fuel can be burned, making more power) and gives a longer life to other components such as electronics. Back in the day before I had kids, I insulated the exhaust on my hill climb car, the clams are designed so that any excess snaps off easily. Be VERY careful of the broken ends at the end of the clamps as it's razor sharp! (I have the scars to prove this!)
