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Cold Air Intakes worthwhile
Intakes and exhausts on diesels seems to be particularly sensitive to restriction and efficiency. You can see significant gains with efficiency on a diesel and with the expense of fuel these days, it might be worth the money. Diesel fuel usage is related to power delivered by the engine (as with a gasoline engine) but with a gas engine, the increased airflow goes through a fuel metering device that is airflow sensitive with either fuel injection or with carburetion.
You should see a fuel efficiency increase on both engines as long as you don't start using more power. But, if you use that extra efficiency to deliver more power to the ground, then lower fuel milage will result even if an overall efficiency increase is seen. If the extra potential is used to push the driver back into the seat while taking off from stoplights, you might be delighted with the performance and disappointed with the fuel economy.
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Cold Air Intakes worthwhile
I have a 1987 Dodge Ramcharger with a 5.9 V-8. I have done some extreme modifications to the entire truck. I put on a K&N air filter but didn't see much change in HP, torque, or fuel economy until I opened up the exhaust by installing a free flow catalytic converter, flowmaster 44 muffler and dual stainless steel 3" exhaust. The old advice is true, if you cram more air in, its gotta go somewhere. So, you have to allow for a more freeflowing exhaust. The best increase in HP and fuel economy came when I installed a throttle body spacer. Several aftermarket spacers are available. They are much less expensive that a K&N filter and I beleive they deliver much better results for the money. Good luck.
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Cold Air Intakes worthwhile
It's kind of like those Visa card commercials.
To see the look on peoples faces when a dually 4x4 that weighs 4 tons eases past them at the lights is, as Mike put it, "delightful" .....
When they see the tandem trailer and 40hp tractor passing them too, that is "priceless", to say the least .....
The improved mileage I (usually) get is entirely dependant on my right foot, and in direct relation to it's position, the farther down my foot goes, the farther down my mileage goes..... but it's worth every drop of recycled dinosaurs.
I have definitely been guilty of leaving the odd jerk 'in a cloud', literally ......
Best of luck.
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Cold Air Intakes worthwhile
Murf, I hear ya! My brother was pretty unhappy when I beat him in a drag race using my F-250 SD diesel. When we got doen, the first thing I asked was if he lost because of spinning the tires due to wet pavement. I said I had to back-pedal the throttle because I kept spinning my tires.
He hadn't spun the tires and wasn't happy that I beat even though I was. He got a different vehicle shortly later...
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Cold Air Intakes worthwhile
The cold air intake systems arent as much about air flow as they are air density. Cold air is more dense than hot air. Denser air = more power. My experience with oil filters verses paper element is that you wont see any performance benefits with just the addition of a less restrictive filter. You may see some tiny benefits from adding a cold air intake and a little more if you add a less restrictive exhaust.
As was said above, the K&N type filters dont seem to filter as well as a new paper filter but Im undecided if it really makes a difference to the engine if there are almost microscopic dirt particals being ingested. It could be said that these small particles stick to the sides of the cylinders and cause wear over time. I think they just pass right through the engine. What doesnt pass through the engine gets caught in the oil and filtered and flushed when you change the oil.
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Cold Air Intakes worthwhile
Hmm I see Murf has the dreaded smokem if you got em disease:D.
I have a 99 F350 Dually PSD Crewcab with a 5" exhaust and Diablo programmer. Talk about some power!!! Mileage of course has gone up provided I can keep my foot out of it. I get a pretty consistant 15+ MPG as a daily driver, I havent done any long highway driving since I added the programmer, but stock programming with the exhaust is 18+ though the mountains of west virginia and those areas. Diesels are very easy to get more power and economy out of them, but not the gassers. the most you can get out of a gasser without huge expenses and reworking is about 20HP. The cheapest improvement of course is intake and exhaust, but the K&N kit is not the way to do it. For example, take a grand marquis or crown vic. Put on a dual exhaust, free flow mufflers and an airbox and MAF from a Marauder and programming and you will get a huge improvement in performance, and economy wont be hurt unless you keep your foot in it.
As far as what huffman stated, on any engine, ingestion of dirt is NOT good no matter how fine. On a diesel with a turbo, the term dusted comes up a lot, that is when a turbo fails due to the ingestion of dirt, and usually from either a leaking airbox, or a poor filter. The way to tell is to remove the filter and run your fingers around the intake behind the filter. If you get any dirt on your finger, your filter is not working and your engine is ingesting dirt which is not good at all, no matter how fine it is, in fact the finer the dirt, the more damage it can do since it can be suspended in the oil, get past the filter and wind up between bearing surfaces. Oil Filters only filter up to a certain point, and unless you have a bypass filter system install, fine dirt that can get past a K&N, and there will be dirt getting past it until it gets dirty enough, will get into your oil and past your oil filter. K&N Filters are great for racing applications where the engines are torn down regularly and excel in those fields, but for the normal person in daily driving, until that filter gets dirty, it can cause a potential engine problem. Those FIPK are mainly for show, they wont give you anything more than a stock system will. start with the exhaust first, and I dont mean put on a fart can. A good system is either cat back or headers back.
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08-08-2005, 11:29 
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