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Digital Subscriptions > Fast Bikes > 344 > KNOW YOUR…EXHAUSTS


Exhausts are an easy way to milk that extra performance from your machine while making it sound and look bloody awesome in the process. For more info we caught up with Dave at SP Engineering to get the lowdown on pipes, systems and everything in between…

Tech Talk


FB: What is an exhaust?

DP: Basically, it’s a set of pipework designed to disperse combustion gas and heat away from the rider, while suppressing noise and helping the engine to perform with greater efficiency.

FB: How does it work?

DP: All combustion engines produce exhaust gases, which are collected from the cylinder head in the engine by an exhaust manifold. The exhaust manifold then acts as a funnel, diverting exhaust gases from all cylinders of the engine then releases them through a single opening – often referred to as the front pipe/ downpipe or header pipe…then through the silencer where most of the sound dampening occurs. So, on a four-stroke engine when the piston is heading down, the inlet valve opens, creating a vacuum which pulls air into the chamber. Fuel is then injected into the cylinder and is ignited to heat up the air in chamber – this creates a pressure which pushes the piston down. The exhaust valve will open as it rotates, allowing the fumes/gases to exit through the manifold and travel through the exhaust system. At this point the heat and gas will be silenced through the muffler as it travels through the exhaust system.

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Base model blitz! Massive 6 bike budget shootout - The 2018... Aprilia RSV4 RR // Kawasaki ZX-10R // Ducati V4 Panigale // Suzuki GSX-R1000 // Honda CBR1000RR // Yamaha YZF-R1 Hypersport hoops - the best road & track rubber rated. Ultimate local blast - how to ride the IOM's quickest road. PLUS: Hicky's guide to nailing the Ulster GP. Master Silverstone: Choose the best exhaust // used MV Agusta Brutale 675 // How to buy a BMW HP4 // Do trackdays in the rain. 215 BHP with no traction control - behind the bars of Hawk Suzuki's British Superbike.