RammerHarder
Senior Member
Did i miss the post where people actually get better mpg using K&N drop in vs OEM...?
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I think its overrated myself, but whatever, if people really feel the need, have at it, it ain`t my money they`re spending.Or some people by them for there lifetime use.
That test is doubtful. K&N is designed so that it doesn't let dirt particles greater than 5 microns into the intake. Particles under 5 microns don't reduce engine compression. The situation among paper filters is different. By moving a LOT of air under HIGH speed they tend to let some > 5 micron particles in, not many but they do. Crucial by cotton filters like K&N is the re-oiling procedure - less is bad, too much oil and your filter needs to sit a couple of days to drain excess oil. UOA should tell the story but with partial truth unless they state the size of dust/silicon particles.
In the end of the day most engines die due to something else than loss of compression. We all know HEMI lifters ... LOL
My 2 bobs worth ...
There is a lot of gossip out there. But this might help in general:
OIL – HOW CLEAN DOES IT HAVE TO BE?
by: Mike Sondalini in collaboration with Don Irvine of Donamar Filters. Data supplied by Donamar Filters
Clean, dry oil can extend equipment life between failure up to 8 - 10 times the normal operating life. Timken, the bearing manufacturer, reports that reducing water levels from 100 ppm (parts per million) to 25 ppm increases bearing life 2 times. British hydraulics research indicate that if solids contamination with particles larger than 5 micron (0.005 mm or 0.0002”) is reduced from the range of 5,000 – 10,000 particles per milliliter of oil to 160 – 320 particles, the machine life is increased 5 times.
If you want extremely low wear rates and long equipment life the evidence indicates that oil needs to be filtered down to sub 5 micron size and preferably down to one micron size. Care needs to be taken that the filter does also not remove any solid additives, such as graphite, in the oil. Additives dissolved in the oil will not be removed unless the additive is attached to a solid particle.
SAE Technical Paper 942032: “It’s a commonly known fact that lubrication oil does not wear out mechanically, and if kept clean will maintain its lubrication qualities intact almost indefinitely”
Contaminants between 2 and 20 microns in size can be particularly damaging since they can disrupt hydrodynamic lubrication by entering wear surface.”
One such study by General Motors concluded that, "controlling particles in the 3 micron to 10 micron range had the greatest impact on wear rates and that engine wear rates correlated directly to the dust concentration levels in the sump."
More information about the book "How to Select a Motor Oil and Filter for Your Car or Truck"
My friend's experience with K&N in an Australian Nissan Patrol is like this:
View attachment 155136
????
If this is all it takes to gain 4mpg why wouldn't the factory do this from the start? They come up with more gimmicks to improve mileage yet this seems so simple????
I’ve always thought adding parts to try and get more response and then wanting better MPG is kind of counterproductive anyway. Only time I’ve ever seen better MPG after making any changes to the air induction of a V8 on a stock tune was with cruise control set on a longer trip.
My Ram with S&B air intake basically stayed the same, maybe a slight improvement when cruising empty. But the first couple weeks I had it on the MPG plummeted because I’d constantly stomp the pedal to hear the air being gulped down.
392 Charger has a OEM Hellcat air inlet and filter and 87mm venturi ported OEM throttle body. The car will do 25+ MPG all day long on the highway with cruise on. Since doing the mods I have seen a max of 3 MPG better on the highway. But around town I get… definitely under the advertised 14 lol. I’ll take the blame there.
I'm an old fart so must be the fly in the ointment on these bolt on up-grades to intake and exhaust performance. I did the factory Mopar CAI, TTI long tube header, duel Flow Master cats, big pipe Cat Back MBRP system and saw no appreciable diff in fuel mileage at all on my 2003 5.7 SLT quad cab 2WD machine. That is the reason (fuel mileage) I did the mods. Oh yeah there was that "healthy" exhaust note when you stuck yer foot in it, but sad to say, even that got tiresome. The secondary sub harmonic drone in the cab when at highway speeds (right in the cruise sweet spot..65 to 75mph) was both annoying and oppressive when on long trips. I was in fact embarrassed taking anybody out on the highway in the truck. Which was sad because the ride in the Dodge on the highway is just wonderful, as you all know. Loved the exhaust rumble around town at lower speeds though.
Now having said that: I loved the idea of having stainless steel pipe work from front to back just for longevity sake, install once and done. The MBRP system was a work of art, The TTI headers and cats fit up beautifully, although the headers tube internal surfaces were coated in a greasy gritty substance right out of the box that I had to remove via a solvent bath. In the end I kept the CAI and piping but went back to a Walker Muffers Inc. factory replacement muffler to take the drone away when on the highway at cruise speeds. Best thing ever. Mileage again, did not change that I noticed.
My simple theory on this is ,..the motor will inhale only a given amount of air equal to the swept volume of the total displacement...no more no less. Gains that most producers advertised are.....hopeful numbers generated on some other plant..ie: not real world. But hey...that's just my opinion (no pun intended) your mileage will vary!
O.k. flame suit on. Bring it! Be forewarned,. I will not argue about this...to old to waste my time to do that these days. I fully understand the "young mans need to have bigger, badder,longer, wider, more chrome, less chrome, lower stance, higher stance, ….******, (ha ha) as I was young once too don't forget. But with time and age comes understanding and just maybe a modicum of common sense. Gotta admit...most of this type of stuff is nice to look at for sure. I just don't think we see the advertised gains in the real world...?...did I say that already?..I forget.. (that's an age thing too!).
T.
My simple theory on this is ,..the motor will inhale only a given amount of air equal to the swept volume of the total displacement...no more no less. Gains that most producers advertised are.....????
I just don't think we see the advertised gains in the real world...?..
T.
Agh the K&N vs paper battle. There’s plenty of studies showing the k&n doesn’t filter as much. And a lot of it may be because most people don’t oil/maintain them right. Some people over oil it as well and mess up the Maf.