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#41
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Class Action Suit On BMW N54 Turbo Engine For Defective High Pressure Fuel Pumps and Turbo Chargers
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#42
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#43
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#44
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2008 X5 4.8 Jet Black/Black Nevada/Dark Burl Walnut Adaptive Drive Premium Pack Tech Pack Climate Pack Sport Pack 20" Wheel Option Premium Sound Sirius Satellite Rear DVD Entertainment Multi-Contour Seats Comfort Access 3rd Row Seat Heated Front Seats Running Boards 3M VentureShield Paint Protection Film |
#45
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I think both engines will last a long time but everything that's bolted to them will more like be the points of failure.
on the diesel you have high pressure fuel pump(s) and turbos... on the V8 you have less parts to fail. |
#46
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I think all things being equal, cylinder bore to piston ring wear on a diesel would always be lower than gas because max torque arrives at a much lower rpm. In other words, over the same amount of miles the engine will have rotated much less on a diesel than a gas.
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#47
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But other things aren't equal. I agree that a lower speed engine will have potentially less cylinder bore wear, but recall that the gasoline version is now turbocharged and gets its peak torque at a similar rpm to the diesel. My 535i reached peak torque at 1300 rpm, and I would expect the V8 to be somewhat similar.
Now add in the peak cylinder pressures from the diesel compared to the gasoline version. This will impact block fatigue, bearing loads, and thust loads on the piston and cylinder wall. I know that piston loads increase with the square of engine speed, and only linearly with increased cylinder pressures, but the diesel always has higher cylinder pressures, and the gasoline engine is only occasionally at higher rpm. All in all, I would call it a wash. There is no logic to the diesel lasting longer, but it shouldn't last any less time, either. And it isn't like the transmission, ancillaries, and electronics are still going to be working as new when the engine finally does give out.
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#48
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#49
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Another mark against the gas is the trouble BMW has had with ethanol blended fuel when used in direct injected gas engines (335i). At least in the US, that 10% blend will likely become 25% incrementally in the next 10 to 15 years. A blown HPFP with other collateral damage at higher mileages may send it the junkyard. The biodiesel OTOH has better fuel properties (cetane, lubricity) than regular D2 so that looks like a plus for future diesel use. This argument really is academic though in that most BMW owners will not keep their car past 4-5 years, much less 10-15. And those that do will likely have their pocketbook lightened by something else than an engine failure. |
#50
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Unless any of you are engineer's that work in the field of internal combustion engines everything you say is based on your best guess and has no basis in the real world.
As I am NOT an engineer I am not going to opine on cylinder pressures, engine speed, or any of the other factors that impact the longevity of an internal combustion engine. All I will say is this, I had the 4.4i V8 X5 before I have the diesel now and I much prefer the diesel for day to day driving. The torque arrives sooner, the power is more than enough and the fuel mileage is heads and tails better. BMW has been building diesel engines for almost thirty years...and have been using turbocharging since the beginning. It is a tried and tested technology and overall diesel engines have been shown to last longer than equivalent gas engines.
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