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07-27-2011, 04:00 PM
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#1
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Member
Join Date: Jun 2011
Posts: 48
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KN air intake system
I have a 96, E350 Ford class C motor home. Was wondering if a K&N air intake system for the 460ci would help with the gas mileage.
At this time I am getting 8.0 to 8.5mpg on highway speeds.
Any ideas?
Larry
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07-27-2011, 04:11 PM
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#2
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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"Performance" intake systems (note that I have it in quotes - most don't do much of anything for performance) are designed with the "idea" of increasing engine output - ie horespower and torque.
That would happen at near full throttle, if at all. Increasing MPG would be something that happens at smaller throttle openings.
I was in the auto repair business for 45 years, and saw all sorts of BS devices promoted - none have ever worked.
Keep the engine in tune and practice MPG improving driving habits. That will be your best you can do.
Google "HyperMiling" for tips that can save you 10-20% depending on how you drive now.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012
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07-27-2011, 09:05 PM
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#3
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Senior Member
Winnebago Owners Club
Join Date: May 2009
Location: AZ Mountains
Posts: 394
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I had my own auto business for years, focusing on high performance Chevys. As Bluepill said most of the 'add on this giz to gain 50% more horsepower were total phonys. I found that most of the improvements realized by customers were due to either A) the customer's imagination or B) the customer had almost never mashed the pedal into the floor before, and when he did (after the 'upgrade') it was absolutely amazing. Recommend not to waste your bucks. Follow bluepills suggestions above.
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07-28-2011, 01:10 AM
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#4
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Sep 2007
Posts: 2,976
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Quote:
Originally Posted by BARNES
I have a 96, E350 Ford class C motor home. Was wondering if a K&N air intake system for the 460ci would help with the gas mileage.
At this time I am getting 8.0 to 8.5mpg on highway speeds.
Any ideas?
maybe
Larry
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a k&n filter element will help a little for both power and mileage.
i get MAYBE .5 mpg better from the k&n filter element and dual low restriction aero mufflers.
imho the expensive ''cai'' systems are a waste of money.
rather than the k&n filter element, i would install an s&b element. the s&b is thicker for better filtration, still very low restriction.
they are both oiled gauze filters.
__________________
01 WINNEBAGO 35U W20.8.1L 5sp allison SW Wa,. Good Sam, SKP. RVM 198 AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. Michelins, TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '21MB GLA FWD on dolly
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07-29-2011, 11:28 AM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2003
Location: Palisade CO
Posts: 3,588
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The K&N air filter systems apparently don't test very well.
SEE HERE
And HERE
__________________
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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07-30-2011, 11:25 AM
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#6
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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Clay, Thanks for the links.
When you see the little Honda Civics buzzing around with fart-can mufflers and blowing out blue smoke from oil burning, I'll bet it's piston ring / cylinder damage from poorly filtered air rather than bouncing off the rev limiter that's to blame.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012
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07-30-2011, 01:43 PM
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#7
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Member
Join Date: Jun 2011
Posts: 48
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Thanks for the links too. I guess by improving the air flow you must have less filtering.
I bought a Fram filter for $10.95 v/s the $39.95 for the K&N.
Larry
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08-03-2011, 05:42 AM
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#8
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Senior Member
Join Date: Apr 2011
Posts: 2,569
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I might be wrong, a modern computerized, fuel injected engine only takes in a predetermined amount of air per RPM and throttle position. I have run K&N filters in the past only because of extreme dirty operating conditions, and it was cheaper in the long run to reuse the filter. I was buying a air filter every two months and it don't take long to pay for itself. For my application,400 Cat, $390 is too much for a reusable filter to use on the highway.
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08-03-2011, 05:50 AM
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#9
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Registered User
Join Date: Oct 2010
Location: Central Florida
Posts: 525
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Another problem with the K&N and some of the others out there is that you have to clean and re-oil the filter. If you happen to get to much oil on the filter, the oil will foul the Mass Air Flow sensor, which will set a check engine light, and then you have to replace the MAF as it usually cannot be cleaned.
__________________
R & E
No RV at the moment
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