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June 30th, 2018 12:09 PM #10
But you didn’t factor in that things have definitely become more efficient. Looking back, glass halogen sealed beams were a pain. They take up a lot of power but they barely put out any light compared to modern multi-reflector halogen, HID, or LED headlamps. And when they get nearer to the end of their service life, they produce even less lght. Yes, they’re made of glass and impervious to fogging or UV damage, still, they produce less light overall and has very inefficient beam patterns. Besides, glass is heavier than plastic. Car manufacturers will always think of ways to make vehicles as light as possible to improve fuel economy. Every ounce of mass shaved off adds up. Those glass headlamp enclosures, which are now probably just relegated to luxury vehicles, fall into this category.
As for starter motors, for the most part, engineers have made engine components lighter and so there’s really less need to waste resources by over-engineering the starter motor. And I repeat, they want to reduce the weight of the components as much as they can while still maintaining or optimizing the operational specs (ie. Torque, RPM, current and voltage requirements, MTBF etc.),