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Old 12-25-2010, 07:57 PM   #29
Full Timers/Diesel power.
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Originally Posted by SSChanger View Post
the K&N filter, which I knew could be washed (I've done that) but didn't know was supposed to be oiled.... I'll be leaving the K&N in the garage.
It's a good system (we have one that is located in a canister and has a splash plate). Any NAPA parts outlet or such should have the K&N cleaning kit which comes with the oil and instructions. I clean ours every 30K or so.

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Old 12-25-2010, 08:20 PM   #30
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Diesel engines are far different from gas engines. Almost all diesel engines have no throttle plate. So the engine is constantly flowing (lets say its a 7.3) the necessary CFM for a 7.3 liter engine.
A gas engine has a throttle plate, so it only flows enough air for the current rpm of the engine.
Think about how much air that K&N has to constantly filter on a diesel. Its going to filter the air but will quickly be filled with dust and dirt way faster than if it were on a gas engine.

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Old 12-25-2010, 10:03 PM   #31
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Hi, according to a video from Ford Motor Company, [tests performed by Ford engineers] the use of after market [K&N Etc.] air filters allows for more dirt particles to enter the engine destroying the turbines in the intake side of the turbo-charger. Note the massive size and design on the Ford factory Diesel air filter elements. So much for the more horse power theory.

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Old 12-26-2010, 06:24 AM   #32
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saw sometime back that k&n filters let to much fine grit in to air intake.
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Old 12-26-2010, 07:39 AM   #33
Full Timers/Diesel power.
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Like many things in life, cleaning and oiling the K&N (original on our Izuzu) is a art/science. Note my mileage, problems zero with the turbo or the engine.
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Old 12-26-2010, 08:27 AM   #34
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The K&N filter is great for the drag strip where there is no sand but on the road they pass grit. I used them until I went west and encountered fine sand and grit. I checked the filter after about 1,000 miles of western travel and found sand in the air horn down stream of the filter.

None of us are pulling enough air into out engines to warrant they damage that will follow the use of a K&N filter. I have 2 diesels and both will maintain full boost pressure with stock filters. If the boost is there there is no shortage of air.
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Old 12-26-2010, 10:00 AM   #35
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Originally Posted by jdalrymple
The usefulness or performance of aftermarket products aside, the fact is vehicles produced in America, or produce in another country for sale or for use in America, achieve the poorest fuel economy in the world.

While vehicles sold here are some of the most technically advanced, government regulations on emissions require a waste of fuel to achieve the required levels. The on-board computers actually add fuel on the input side when the sensors see unburned products of combustion in the exhaust system. This additional fuel promotes higher temps in the catalytic converter, which re-burns the exhaust gasses, to assure the required emissions level.

An example is the European SmartCar. This vehicle achieves 50-60 mpg in the EU, but due to the emissions laws in the US, it is de-tuned to around 30 mpg. This is also witnessed by the fact that new engines, and improvements to current engines, are meant to meet emissions standards, and are less concerned about improving fuel economy.

One wonders if the outcome is truly a gain. Is burning more fuel now really better than the limited improvement of a slightly better emissions measurement.

Further, not all the automotive engineers work for the auto manufacturers. It seems that products not totally concerned with emissions limitations can make some improvements.
In the EU they use an imperial gallon. Its about 5 US quarts versus the the US gallon at 4 quarts. This explains the difference.
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Old 12-26-2010, 10:38 AM   #36
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I would be very careful when comparing mileage between European models and US models, since the testing procedures vary significantly.
Remember also that the smallest European cars would be considered quite underpowered by most US drivers.

We'll see more fuel efficient cars here as gas prices continue to increase.

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Old 12-26-2010, 10:46 AM   #37
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The EU uses litres.

The EU former imperial gallons (1 gal = 4.564 litters.)
The US uses weird gallons (1 gal - 3.785 liters.)

Thus: a 45 mpg car in Europe is a 37 mpg car in the US. They are getting the same fuel economy.

As for the K&N filters, just strip down the engine and look at the valve seats after 1,000 miles with a K&N and you can see the difference - they're all clean and shiny and smooth. THis is a bad thing: as the valves close and bed into their seats, any fine dust particles gradually wear off the touching surfaces. After a hundred thousand miles or so, the valve seats become so worn either the valve cannot seat properly, and compression is lost, or the exhaust valve seat loses enough mass that it starts to overheat.

You can take the couple of hundred dollars worth of gas you saves and put it towards the repair bill, or more likely, the cost of a new car as you pass the old one down the road to be someone else's problem.
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Old 12-26-2010, 07:00 PM   #38
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K&N is a crapshoot. Oil analysis will show that they work fine, as intended. But proper seal, proper oil, no inadvertent tears, etc, make it hard to justify as these can slip by undetected.

The DONALDSON PowerCore Generation Two series is current state of the art for the diesels. Stock on Ford 6.0, and retrofit after market kits on others.
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Old 01-04-2011, 10:55 PM   #39
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2011 Ford diesels - 400 hp with 800 lbs torque - I'll just keep mine stock when I get her...

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