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05-10-2016, 10:55 AM
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#1
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Member
Join Date: Feb 2016
Location: Madison, IN
Posts: 51
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K&N cold air intake
So what are your opinions or experiences with using a K&N intake system on a Duramax?
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Tom and Melissa Beaco & Skittles (pup-pups)
2018 Grand Design Momentum 376TH
2017 Silverado 3500HD Duramax dually
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05-10-2016, 08:13 PM
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#2
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,592
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Quote:
Originally Posted by tsm1975
So what are your opinions or experiences with using a K&N intake system on a Duramax?
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Save your money, the OEM filter outperforms the K&N, and every other aftermarket filter tested: ISO 5011 air filter test
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-11-2016, 03:26 AM
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#3
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Senior Member
Join Date: Nov 2010
Location: Maplesville, AL - Home Base
Posts: 158
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Quote:
Originally Posted by Ray,IN
Save your money, the OEM filter outperforms the K&N, and every other aftermarket filter tested: ISO 5011 air filter test
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I agree with this from every test I have ever seen and over 10 years experience with the OEM Duramax filter system.
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Ed
KM4STL
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05-11-2016, 05:52 AM
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#4
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Member
Join Date: Aug 2015
Location: Brandon, FL
Posts: 78
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X3 - K&N is supposedly the worse CAI for diesels. A CAI will do nothing or very little for a stock motor. You will only see benefits if you modify your motor to the extent of needing the extra air flow. To be honest though, I do have a S&B CAI. I do have some modifications on my truck.
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Smitty
2020 Grand Design 287RLTS
2017 Ram 2500 Big Horn 6.7 CTD
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05-11-2016, 06:58 AM
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#5
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Member
Join Date: Feb 2016
Location: Madison, IN
Posts: 51
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WOW!! Unanimous opinion! Thanks everyone....I was kind of wondering if you are taking in that much more wouldn't you at the least have to modify the exhaust so you can let more out? If the exhaust couldn't handle the increased air intake then it would have some kind of "bottle neck" effect, but I'm not a mechanic.
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Tom and Melissa Beaco & Skittles (pup-pups)
2018 Grand Design Momentum 376TH
2017 Silverado 3500HD Duramax dually
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05-11-2016, 07:24 AM
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#6
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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Quote:
Originally Posted by tsm1975
WOW!! Unanimous opinion! Thanks everyone....I was kind of wondering if you are taking in that much more wouldn't you at the least have to modify the exhaust so you can let more out? If the exhaust couldn't handle the increased air intake then it would have some kind of "bottle neck" effect, but I'm not a mechanic.
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The basic issue with these increased air flow intake systems is the enormous volume of air ingested by a Diesel engine. This volume makes them sensitive to contaminated air, particularly dust. A medium or heavy duty diesel will require a rebuild if it ingests 4-5 ounces of dust over its lifetime.
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Steve Ownby
Full time since 2007
2003 Monaco Signature
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05-11-2016, 07:31 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Oct 2014
Location: Rigby, Idaho
Posts: 3,902
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EVERY K&N application I have ever seen is exposed to and draws from engine compartment air which is at least heated by the hot engine or heated by the hot radiator, is thus hotter and thus less dense than outside air, and is thus, counterproductive junk displaying the poor decision making of the owner.
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Cheers,
TonyMac
2006 Monaco Safari Cheetah 40PMT
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05-11-2016, 11:26 PM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,592
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Quote:
Originally Posted by tsm1975
WOW!! Unanimous opinion! Thanks everyone....I was kind of wondering if you are taking in that much more wouldn't you at the least have to modify the exhaust so you can let more out? If the exhaust couldn't handle the increased air intake then it would have some kind of "bottle neck" effect, but I'm not a mechanic.
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You are correct! When modifying a diesel engine the first step is to enlarge the exhaust from the turbo back (just like a water pipe, the smallest restriction determines total flow volume), second is install a complete set of gauges so you know what's happening to the engine(@ 1,380 deg F exhaust valves begin to soften), only then will an intake modification safely improve performance.
20 years ago the rule of thumb for increasing HP in a diesel was $10 per HP, I shudder to think what it is today.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-12-2016, 12:11 AM
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#9
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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I used K&N filters on my racing motorcycles, but I rebuilt the engines at least yearly. Don't want to have a dusted engine in an RV or car/truck so I stick with the OEM filters.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-12-2016, 05:07 AM
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#10
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Member
Join Date: Aug 2015
Location: Brandon, FL
Posts: 78
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Quote:
Originally Posted by Ray,IN
You are correct! When modifying a diesel engine the first step is to enlarge the exhaust from the turbo back (just like a water pipe, the smallest restriction determines total flow volume), second is install a complete set of gauges so you know what's happening to the engine(@ 1,380 deg F exhaust valves begin to soften), only then will an intake modification safely improve performance.
20 years ago the rule of thumb for increasing HP in a diesel was $10 per HP, I shudder to think what it is today.
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X2 on the gauges...except that was the first step for me. I use the Edge digital setup. Monitor EGT, Transmission temp, boost, and fuel rail pressure.
I kept the same exhaust system, just replaced the OEM muffler with an after market (MBRP) muffler. I saw the biggest gain from that. From how it was explained to me...you would see no gains from increasing the diameter of the exhaust system unless you were going for big HP, say 500 or better. This is for the Ram/CTD...could be different for the Duramax and others.
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Smitty
2020 Grand Design 287RLTS
2017 Ram 2500 Big Horn 6.7 CTD
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05-12-2016, 06:55 AM
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#11
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Member
Join Date: Feb 2016
Location: Madison, IN
Posts: 51
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Ok guys.....Ray and Smitty.....if I perform the mods you suggest what kind of performance increases can I expect, hp, mpg, torque?
__________________
Tom and Melissa Beaco & Skittles (pup-pups)
2018 Grand Design Momentum 376TH
2017 Silverado 3500HD Duramax dually
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05-12-2016, 03:26 PM
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#12
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Member
Join Date: Aug 2015
Location: Brandon, FL
Posts: 78
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Quote:
Originally Posted by tsm1975
Ok guys.....Ray and Smitty.....if I perform the mods you suggest what kind of performance increases can I expect, hp, mpg, torque?
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IMHO...
1. What is your goal...looking to accomplish?
2. Get gauges.
3. Transmission: That is usually the weakest link. A stock transmission can only handle so much hp/torque over stock.
4. If you are wanting a few more HP/torque I would start with a tuner of some sort. I know nothing of Duramax so can not recommend anything. I do believe EFI Live is available, which is what I run on my Ram. I originally used a tuner with a 40, 70 (towing), 100hp tunes for years with no ill effects. But, I am a conservative driver, no burn outs, no 2500 rpm launches and eased into it, especially when towing.See #3.
5. Exhaust: I did see some benefit in changing out my muffler. It seemed to lower EGT's some. Usually lower EGT's means you are burning less fuel. Did it help with HP/torque, MPG...not really sure.
6. See #3.
7. If available, talk to a dependable diesel performance shop.
8. Find a forum for diesels/Duramaxx and read up. Lots of good info out there...but a lot of BS also.
Hope this helps...if you would like to discuss send me a PM and I can pass along my phone number.
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Smitty
2020 Grand Design 287RLTS
2017 Ram 2500 Big Horn 6.7 CTD
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06-28-2016, 05:22 PM
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#13
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Senior Member
Join Date: Dec 2014
Location: SE WI
Posts: 553
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I have one on my 2001 GMC Sierra 3500 with the duramax and am looking for the oem intake to put back on. The K&N doesn't give any boosts that i can tell and you have to constantly clean the MAF sensor due to the oil on the filter. Be for I get yelled at, I bought the truck with the K&N installed on it.
If anyone knows of a oem intake out there let me know please.
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Aaron, Erica and Lizzy and Abby the Labs.
2014 Chevrolet 3500 CC SB Diesel
2007 Grand Junction 34TRG
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06-29-2016, 02:40 AM
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#14
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Senior Member
Join Date: Nov 2010
Location: Maplesville, AL - Home Base
Posts: 158
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Quote:
Originally Posted by Airmech
I have one on my 2001 GMC Sierra 3500 with the duramax and am looking for the oem intake to put back on. The K&N doesn't give any boosts that i can tell and you have to constantly clean the MAF sensor due to the oil on the filter. Be for I get yelled at, I bought the truck with the K&N installed on it.
If anyone knows of a oem intake out there let me know please.
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And numerous tests through the years have shown that K&N filters pass more particulate matter through to your engine.
I would check a salvage yard or two and find a truck that wasn't destroyed in the front.
Good luck.
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Ed
KM4STL
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