With each new euronorm (European emission standards) the restrictions are more difficult to comply with. Manufacturers solve this by increase the engine’s CC and make it consume more fuel. How does this result in being a “cleaner” engine, burning more fuel sounds contradicting to me.
example, motorcycle triumph:
Old model: Tiger 800 – 799cc – 95HP – consumption 4.7L/100km – EURO 4
New model: Tiger 900 – 888cc – 95HP – consumption 5.2L/100km – EURO 5
In: Engineering
I do not know this for sure, but my best guess is that they put roughly the same amount of fuel into a larger engine so that the engine produces the same emisions as a smaller engine. This will give the appearance of being cleaner. It’s also possible that they do some extra tricks with things like EGR systems and variable timing that actually do lower the power of the engine at full throttle, but wind up being more efficient for daily driving. Much like in the 70’s where all of a sudden a chevy v8 put out a whole 150 hp, the only choice they have is to “tune down” engines to pass because they simply don’t know how to do it any other way. The good news is that on engines that they do this to, there is a much greater chance for power gains in the aftermarket. Like the 5.0 engine in the fox body mustangs. Lots of room for improvement.
Latest Answers