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Why is the 520d so cheap? with almost the 523i specs. BMW Malaysia...an explaination?
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<blockquote data-quote="paultantk" data-source="post: 523708" data-attributes="member: 6665"><p>Some links</p><p></p><p><a href="http://autorepair.about.com/od/quicktips/a/Diesel-Engines-Vs-Gas-Engines-Reliability-Efficiency.htm" target="_blank">http://autorepair.about.com/od/quicktips/a/Diesel-Engines-Vs-Gas-Engines-Reliability-Efficiency.htm</a></p><p><a href="http://answers.yahoo.com/question/index?qid=20110117195041AAFCCEv" target="_blank">http://answers.yahoo.com/question/index?qid=20110117195041AAFCCEv</a></p><p><a href="http://dieselgiant.com/why_diesel.htm" target="_blank">http://dieselgiant.com/why_diesel.htm</a></p><p></p><p>Diesel naturally produces more power because it has higher energy content. And from my daily driving pattern, the gearbox shifts up at 2,000rpm and sometimes even lower. The engine is relatively unstressed.</p><p></p><p>Let's also look at torque to displacement ratio. The 2.0 liter engine makes 380Nm, which translates to 95Nm per cylinder of 500cc. </p><p></p><p>The 535d's 3.0 liter engine makes 600Nm, which is 100Nm per cylinder of 500cc. Doesn't it look like the torque produced per cylinder ratio of the 6 cylinder versus the 4 cylinder shows that the 4 cylinder is actually slightly less stressed at peak performance compared to the 6 cylinder?</p><p></p><p>If we drop one turbo and look at the 530d, we're looking at 6 cylinders of 500cc each making 540Nm, which is 90Nm per cylinder. That's just a small difference of 5Nm per cylinder.</p><p></p><p>That means similar stress under hard driving when you look at power to displacement ratio.</p><p></p><p>Diesel engines also have much lower RPM limits, while normally aspirated petrol engines must rev higher to make their power, the forces that an engine's internals has to take actually goes up exponentially with engine RPM.</p><p></p><p>And the F10 doesn't really take all that much power to move under gentle driving. The 523i is able to propel it fairly well with just 250Nm torque. During gentle driving it's producing less than 250Nm. The 520d's engine has to do much less in terms of percentage of peak potential to move the car. When I drive, the rev needle just touches 2,000rpm and it shifts up to the next gear. Very relaxed feeling, where got stressed?</p><p></p><p>Like ALBundy said... the diesel engine internals are stronger and memang built to take that kind of stress.</p><p></p><p>The engines that are actually very chill are the 2.0 liter turbodiesel in the 116d and 118d... only making 260Nm and 320Nm respectively. But I do not know if they use similiar strength internals as the "full power" 184hp/380Nm 120d.</p><p></p><p>Diesel engines are just simply much more efficient at converting fuel into power… its not that they're being strained to the max to make the power they make.</p><p></p><p>Diesel engines also run much cooler than petrol engines because they do not use spark plugs. And as a result diesel engine exhaust stream is also much cooler than petrol engines, which is why VGT turbos are so common in diesel engines but only exotic cars like the Porsche 911 Turbo are able to afford expensive VGT turbos that can withstand the heat of the petrol engine exhaust stream.</p></blockquote><p></p>
[QUOTE="paultantk, post: 523708, member: 6665"] Some links [url]http://autorepair.about.com/od/quicktips/a/Diesel-Engines-Vs-Gas-Engines-Reliability-Efficiency.htm[/url] [url]http://answers.yahoo.com/question/index?qid=20110117195041AAFCCEv[/url] [url]http://dieselgiant.com/why_diesel.htm[/url] Diesel naturally produces more power because it has higher energy content. And from my daily driving pattern, the gearbox shifts up at 2,000rpm and sometimes even lower. The engine is relatively unstressed. Let's also look at torque to displacement ratio. The 2.0 liter engine makes 380Nm, which translates to 95Nm per cylinder of 500cc. The 535d's 3.0 liter engine makes 600Nm, which is 100Nm per cylinder of 500cc. Doesn't it look like the torque produced per cylinder ratio of the 6 cylinder versus the 4 cylinder shows that the 4 cylinder is actually slightly less stressed at peak performance compared to the 6 cylinder? If we drop one turbo and look at the 530d, we're looking at 6 cylinders of 500cc each making 540Nm, which is 90Nm per cylinder. That's just a small difference of 5Nm per cylinder. That means similar stress under hard driving when you look at power to displacement ratio. Diesel engines also have much lower RPM limits, while normally aspirated petrol engines must rev higher to make their power, the forces that an engine's internals has to take actually goes up exponentially with engine RPM. And the F10 doesn't really take all that much power to move under gentle driving. The 523i is able to propel it fairly well with just 250Nm torque. During gentle driving it's producing less than 250Nm. The 520d's engine has to do much less in terms of percentage of peak potential to move the car. When I drive, the rev needle just touches 2,000rpm and it shifts up to the next gear. Very relaxed feeling, where got stressed? Like ALBundy said... the diesel engine internals are stronger and memang built to take that kind of stress. The engines that are actually very chill are the 2.0 liter turbodiesel in the 116d and 118d... only making 260Nm and 320Nm respectively. But I do not know if they use similiar strength internals as the "full power" 184hp/380Nm 120d. Diesel engines are just simply much more efficient at converting fuel into power… its not that they're being strained to the max to make the power they make. Diesel engines also run much cooler than petrol engines because they do not use spark plugs. And as a result diesel engine exhaust stream is also much cooler than petrol engines, which is why VGT turbos are so common in diesel engines but only exotic cars like the Porsche 911 Turbo are able to afford expensive VGT turbos that can withstand the heat of the petrol engine exhaust stream. [/QUOTE]
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Why is the 520d so cheap? with almost the 523i specs. BMW Malaysia...an explaination?
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