combustion of butane reaction

French Spiderman Alain Robert has finished his latest climbing the tallest building on the globe. Alain has successfully reached the top with the tapered spire across the 160th floor from the building. The 47-year-old is renowned for climbing buildings around the globe just using bare hands and climbing shoes. The EGR system routes a few of the exhaust gases (6 ? 10%) through the EGR valve, back in towards the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they do not burn in the combustion chamber; also, the exhaust gases undertake a few of the space which may preferably be taken with the intake air. This reduces the quantity of intake air available for the combustion process during each Power Stroke; which decreases the peak combustion temperatures. This results in lower NOx emissions.