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09-11-2013, 03:20 AM
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#1
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Junior Member
Join Date: Sep 2013
Posts: 15
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question about K&N filter
Ok guys and gals, this is my first post, I have been reading about all the fuss about gas mileage and the wisdom of driving slower to get better mileage, someone mentioned to me at the dealership that if I get a K&N airfilter it will improve my mpg. So tell me straight, have any of you used the filter and did it improve your mpg? I have a 2002 workhorse 8.1 with 26k miles and just doing a quick check after only 100 miles filled it up and figured about 6 mpg. Thoughts? Suggestions? Comments? Help?
Mike
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09-11-2013, 04:16 AM
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#2
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Senior Member
Join Date: Feb 2013
Location: Dayton, OH
Posts: 493
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Quote:
Originally Posted by mikecosgrove
Ok guys and gals, this is my first post, I have been reading about all the fuss about gas mileage and the wisdom of driving slower to get better mileage, someone mentioned to me at the dealership that if I get a K&N airfilter it will improve my mpg. So tell me straight, have any of you used the filter and did it improve your mpg? I have a 2002 workhorse 8.1 with 26k miles and just doing a quick check after only 100 miles filled it up and figured about 6 mpg. Thoughts? Suggestions? Comments? Help?
Mike
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Hi Mike and . I've used K&N on several cars including my old race cars and would swear by them. I'm not sure of real world with an engine that big but I know all the cars I've ever put them in I saw a slight to moderate HP increase and the same with MPG. I know these are cars and not big block RV's but it's a start. I think your 100 mile sample size is way to small. You need to run at least a full tank of fuel doing regular driving with your coach and probably a little more to get a true read on how well it works. Just my couple of lincolns worth. Good luck in the reasearch and welcome again.
__________________
The Beer Man and Woman (Ray and Tabitha)
2013 Infiniti G37x
Future Entegra Owner & Semper Fi!!!
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09-11-2013, 04:28 AM
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#3
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Senior Member
Join Date: Sep 2012
Posts: 454
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Welcome to the forum. Lots of great people and advice given through many years of hands on experience. K&N intake should also be balanced by a good aftermarket exhaust. Read up on Banks Performance. I have a diesel pusher and most folks do not advocate K&N for the diesel bc it let's in too much dirt. I am not sure of the effect on the 8.1. Many of the posts I have read seem to advocate intake and exhaust mods on the gas engine units. You may also want to research steering stabilizer and sway bars front and rear. I put a bully dog intake and mbrp exhaust on a ford f250 truck and immediately noticed a gain in mpg and power. Remember you are driving a house down the road and slow and steady will give you the best mileage in most cases. Give yourself plenty of braking distance too bc cars will cut in and then put on brakes and expect you and me to stop as fast as they can. Best Wishes to you and your family! Safe Travels!
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09-11-2013, 04:29 AM
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#4
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Senior Member
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 6,196
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Welcome...two
there are 'differing opinions' on the benefits of any oil based filter...
Some say it let's too much oil and 'dust' thru the filter media that can cause issue with turbo's, maf's, etc...
Some say the hp improvements are only at the upper regions of rpm's and very rarely used for normal' driving...
Some say the mpg improvements are negligible....
and some mfg's are using it to deny warranty claims (if that's a concern!)
good luck, do your due diligence and enjoy !
__________________
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk(junk!), 11 MVP Destiny, Open Range TT, Winn LeSharo, C's, popups, vans, tents...
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09-11-2013, 05:06 AM
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#5
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Senior Member
Freightliner Owners Club
Join Date: Apr 2004
Location: Show Low Az
Posts: 1,325
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K&N now has a filter for diesel engines. It is a water washable filter. I have seen it installed on both CAT Cummins engines. The cost equates to 3 filter replacement. So would I use one, Yes based on the cost saving.
So investigate this filter ;
K&N 38-2006S filter $200
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Dale&Susan, 08 Alfa Gold, DaGirlsRv Blog
2015 F-150XLT_2000W Solar_800 AmpHr Lithium
Magnum_MSH 3012 & PT100
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09-11-2013, 05:16 AM
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#6
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Senior Member
National RV Owners Club
Join Date: Dec 2010
Location: Spring Hill, Florida
Posts: 854
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I've used K&N's in car and pickup for many years. Performance or mileage improvements aren't really noticeable by seat of pants feel. At least to me they're not. As far as others claiming they allow more dust through them. I don't see how that's possible given they're an oiled cotton filter media. I like that they're serviceable NOT disposable. Maybe they'll save money over the long haul with a little improvement in economy. They'll definately save money over the long haul versus the cost of replacing paper filters. As far as affecting the mass air flow sensor. The jury is out. I suppose they could depending how close the MAF is to the filter.
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Harley Ultra Classic (Geezer Glide) Rider, Retired US Army Paratrooper, fisherman, shooter. Proud to have served, proud of those that still do, or have done so with pride.
2005 National Dolphin 34'
[SIGPIC][/SIGPIC]
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09-11-2013, 07:06 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Jul 2013
Location: monroe mi.
Posts: 264
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welcome
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James & busa the queen of the rv dogs
you can't put a price on memories 1998 safari serengeti xi 05 jaguar str 2010 mariner
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09-11-2013, 07:09 AM
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#8
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Senior Member
Monaco Owners Club
Join Date: Nov 2010
Location: The Emerald Coast
Posts: 1,759
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Here is a comparison of air filters. Note where K&N is.
ISO 5011 Duramax Air Filter Test Report
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Jim and Jennie, Cats=Bittles and Potter, 2000 Dynasty 350 ISC
2013 Silverado 4x4 Towed with R1200GS in bed.
PROV23:4 Do not wear yourself out to get rich; have the wisdom to show restraint.
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09-11-2013, 07:23 AM
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#9
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Senior Member
Join Date: Oct 2010
Location: Warren County, NJ
Posts: 1,354
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Welcome Mike !
I also own a workhorse with a 8.1. My average is 7 MPG. Personally I think if a air filter would have increased gas milage that significantly the manufacturer would have installed it from the beginning.
I would stay with the air filter that the manufacture recommends and put money toward the other maintenance aspects like fuel filter, sparkplugs, wires, cleaning of mass airflow sensors, O2 sensors.
Best of luck to you on owning a RV !
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Gene & Ginger
2019 Chevy Express 3000 6.0L
2024 Grand Design Imagine 2600RB
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09-11-2013, 07:25 AM
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#10
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Senior Member
Join Date: Feb 2004
Location: Johnstown, PA USA
Posts: 3,326
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Welcome to the forum...
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John, Deb; & our dog, Benji, Forever in our hearts.
2014 Coachmen Leprechaun 319DS V-10
2011 Jeep Liberty Jet & 2014 Jeep Wrangler
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09-11-2013, 07:38 AM
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#11
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Senior Member
Join Date: Feb 2012
Posts: 1,138
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MIke.. I use a K&N filter in my Bounder.... Did I get a nice boost in fuel economy....NOPE... but I did get a little....went from 7.1 to 7.8 MPG on the same drive. Is that due to the air filter... no idea. But I would like to think it was..... I have read the included report on paper versus oil and see that K&N did not do too well in the filtration test....will i run out and buy a paper filter..NOPE....the K&N will remain.
__________________
Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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09-11-2013, 07:46 AM
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#12
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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Quote:
Originally Posted by Coma
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Great info! Thanks!
If a "filter" does not filter, is it a filter?
I prefer clean engine guts!
I have no questions about K&N.
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09-11-2013, 08:57 AM
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#13
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Senior Member
National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,987
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As a point of interest when buying filters make sure you are not getting out of date
old stock.
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Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
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09-11-2013, 12:31 PM
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#14
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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First K&N filtlers.. As others have said I have seen a few gigibytes of argument on how much "Grit" they let through.. I used one on my 1992 Lumina,, and I'm convinced it did improve power and MPG slightly.
But for even better improvement you need to go with the entire K&N Intake, this is a re-designed way to get air into the engine that is less restrictive (or the Banks or Ultra Power kit, all of which are much alike)
And of course the exhaust can also stand an upgrade. I mean we get the air in.. we need to get it out.
Will these pay for themselves? Don't know
Will more Grit get through the K&N (*or other) filter? Same answer, Don't know, remain less than convinced of the dangers.
I was pleased with the performance of the filter on my Lumina... but I'm not quite daring enough to pop one on my 8.1L motor home.
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