![]() ![]() Lean-running engines have lots of potential problems – they run hot, engine wear is more likely, combustion is harder to manage, and mixture ratio is critical to avoid engine damage. The opposite – a rich-running engine – is using a lower ratio of air to fuel it’s got more petrol in the mixture. A lean-running engine is one using a relatively high ratio of air to fuel – it means more of the fuel is burned, and more completely, and less gets into the exhaust and the outside world. The next step in making a clean engine is to make it a lean engine. It’s a waste of money and perfectly good bhp.īut if emissions tests are conducted at low speeds and revs, at partial throttle openings – usually simulating town riding, where pollution is the biggest problem – then that’s where the manufacturers put their efforts to make their engines ‘clean’. If emissions tests aren’t at full throttle and top speed (which they aren’t), then there’s no point engineering an engine to be clean under those conditions. Without getting too side-tracked into the details of how engines work, the bottom line of making an engine’s exhaust gasses ‘clean’ enough to pass emissions tests is, firstly, make them clean only where the motor needs to be clean to pass the tests. Long story and several intertwined reasons, but the biggest culprit is emissions regulations. ![]() Why do motorcycles have a snatchy throttle in the first place? think you’ve said in the past how the ivan tune really improved throttle response from the ecu. i had hoped that maybe you might offer some input on their comments in the article about snatchy throttle. ![]()
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