Understanding The Basics Of How Motorcycle Exhausts Work

A large number of motorcycle enthusiasts these days are do-it-yourselfers and are very knowledgeable about the functioning of their motorcycles. Of course, this skill develops with the hobby, and later on becomes a passion that is necessary to truly immerse yourself in the motorcycle world, to get the most out of it. Still, a sizeable number of newbies to the motorcycle world need some type of introduction into the workings of motorbikes, especially over topics that go beyond the basics of maintenance and general care.

Issues like the basics of brake calibration and understanding how motorcycle exhausts work are sometimes left undiscussed, unless one takes a crash course in mechanical engineering or automotive repair. However, there’s an easy way to go about understanding how motorcycle exhausts work. Aside from watching various videos online that attempt to simplify the process, here is a brief article on what you need to know in order to understand the ins and outs of motorcycle exhausts that could help you some day.

Motorcycle Exhausts – Their Types And Functions

What is a motorcycle exhaust? A motorcycle exhaust is a complex device generally composed of piping, attached to a motorcycle’s engine. Sometimes these are chrome-plated for aesthetic reasons. However, exhaust systems can also be made from aluminum, steel, alloy, carbon fibre, and even titanium.

What does a motorcycle exhaust system do? Motorcycle exhausts mounted on the engine help to re-route noxious gases away from the rider and passenger while simultaneously muffling noise and improving engine performance. Actually, a well-maintained exhaust system can vastly improve overall engine performance and prolongs the engine’s life.

What kind of exhaust systems are there? There are basically two main kinds of exhaust systems available in the market today; a mufflers-only exhaust (properly referred to as bolt-on or slip-on system), and a full exhaust system. The latter one tends to have the added feature of being customizable or otherwise custom-made to suit different specifications and needs.

A third variety is the default exhaust systems that an average motorbike bike is equipped with upon purchasing, which some hard-core enthusiasts consider to be mediocre at best when compared to custom-made exhaust systems.

If you’re looking for a great place to find excellent examples of exhaust systems for your motorcycle, or if you’re ever in need of a high performance customised exhaust system that is sure to rev-up your bike’s speed and overall performance, then visit Trufit Exhaust today: https://www.trufitexhaust.com.au/

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What are Selective Catalytic Reduction and Urea Injection?

Injection systems improve engine performance, so why shouldn’t a similar mechanism enhance your exhaust output? Instead of fuel injection, however, the tech we’re about to discuss injects Urea into diesel exhaust streams. Buckle in while we explain what’s known as Selective Catalytic Reduction and Urea injection. It’s a chemical process that’s been used in industrial diesel engines for some time now, and it’s also found in car exhaust systems.

What is Selective Catalytic Reduction (SCR)?

Selective catalytic reduction technology uses an active chemical injectant as an emission mitigation solution. Specifically, the catalytic agent targets the poisonous nitrogen oxide (Nox) fumes in your exhaust, which is why the technology earns the “selective” prefix. Down among the exhaust pipes, a dosing tank is injecting a gaseous reductant into the engine byproduct stream. A redox reaction takes place between the reductant and the nitrogen oxide. Basically, through some invisible chemical process, the noxious gases are transformed into harmless nitrogen and water, elements that can’t harm the environment.

What about the Urea?

Chemists refer to Urea by its technical label, so substitute that short word with a longer chemical name, something chemical engineers call Aqueous Ammonia. That active liquid compound is what’s injected into the exhaust stream, but we less science-centric types simply call the chemical Urea. Anyway, call it Urea or Aqueous Ammonia, it doesn’t really matter. What does matter is what happens when this chemical and the Nox pass through a catalysing agent. Typically formed from ceramic and some exotic metal (Titanium Oxide or Vanadium Oxide), the honeycombed catalyst converts the Nitrogen Oxide into harmless hydrogen dioxide and nitrogen, plus a few trace wisps of Carbon Dioxide (Co2).

Bringing It All Together

You don’t need a chemistry degree to see how this active emission management system operates. The dosing unit passes NH3 (Ammonia) into the catalyst chamber. Those perforated plates, the Titanium Oxide honeycomb, then swaps electrons and elements so that new compounds form. Now, as stated right in our initial passage, the Selective Catalytic Reduction process has been operating in industrial engines for some time, but the system can scale, so performance cars are enjoying emission attenuation figures that hover around the ninety-percent mark. That Nox reduction figure creates a compelling reason to consider SCR technology.

Passive exhaust system solutions work well when stock factory exhaust systems roll off the assembly line. For a performance engine, though, an active emissions management system represents a welcome addition to the performance exhaust system family, one that uses dosing Urea and a special catalyst to really inhibit the Nox gases.

 

Trufit Exhaust
437 Warrigal Road,
Moorabbin, VIC 3189
Australia
Areas serviced: Melbourne
Tel: 03 9555 5688

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