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02-13-2014, 09:26 PM
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#29
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Senior Member
Join Date: Aug 2009
Location: Dallas,Texas
Posts: 983
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Great info here. But I need more. This is what my indicator looks like with only 2000 miles since new on ISX. While at the factory last October I asked them about restriction between the filter housing and the intake piping that Newmar installed.....they said it was fine. I was tempted to disconnect what they installed just to see if it made a difference. I have not looked at the filter. Any ideas.
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2014 King Aire 4593
24' Stacker w/toys = 75' of fun
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02-14-2014, 09:22 AM
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#30
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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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BTW, for those who are contemplating air housing changes, try hard to increase the piping size from the inlet grille on the coach to the inlet of the air cleaner. Too many sharp bends and too much corrugated flex pipe puts a lot of restriction into the system causing you to blame the air cleaner housing! Increase piping diameter where you can, even after the air cleaner before the turbo then reduce down to inlet size at the very last. It will pay off.[/QUOTE]
How very true, and look at the inlet grille a lot have a smaller area than
the piping connected to them.
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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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02-14-2014, 06:28 PM
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#31
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Member
Join Date: Nov 2013
Posts: 38
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This is the setup on my Dutch Star retrofit. Currently the inlet and outlet are both 6", with no flex duct. I'm changing both to 7". It will be all hard aluminium tubing. The inlet is on the drivers side up high near the rear. The inlet side will come in through the screen into the existing chamber. Then there is a 2' long piece of 7" tubing going into this chamber. Then it makes a 90 into a 12" long piece that feeds the new filter housing. I explained the outlet side in a early post. I really haven't looked at the inlet screen size yet. I believe this has to be an improvement from the 6" tubing and ecolite it replaces. I've modified the old filter stand and made new brackets to mount the new housing. Its all ready to go in, but between the cold and snow it's hard to get much done.
Bullheaded,
12" of restriction on a nearly new filter wouldn't make me real happy.
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02-15-2014, 09:15 AM
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#32
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Senior Member
Join Date: Jun 2005
Location: Indiana
Posts: 1,182
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Quote:
Originally Posted by SteveWV
This is the setup on my Dutch Star retrofit. Currently the inlet and outlet are both 6", with no flex duct. I'm changing both to 7". It will be all hard aluminium tubing. The inlet is on the drivers side up high near the rear. The inlet side will come in through the screen into the existing chamber. Then there is a 2' long piece of 7" tubing going into this chamber. Then it makes a 90 into a 12" long piece that feeds the new filter housing. I explained the outlet side in a early post. I really haven't looked at the inlet screen size yet. I believe this has to be an improvement from the 6" tubing and ecolite it replaces. I've modified the old filter stand and made new brackets to mount the new housing. Its all ready to go in, but between the cold and snow it's hard to get much done.
Bullheaded,
12" of restriction on a nearly new filter wouldn't make me real happy.
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Where did you find the tubing? Did you have to use some larger 90 degree tubing. I would like to do some of these changes also.
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2018 Phaeton 40IH
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02-15-2014, 12:28 PM
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#33
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Member
Join Date: Nov 2013
Posts: 38
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Inlet tubing
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02-15-2014, 12:36 PM
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#34
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Member
Join Date: Nov 2013
Posts: 38
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DAJO,
I just reread my other post. Just to clarify, all my 90's are rubber boots. I didn't intend to make it sound like my turns were out of aluminium, my bad. Steve
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02-15-2014, 12:52 PM
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#35
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Senior Member
Join Date: May 2013
Posts: 786
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Quote:
Originally Posted by bullheaded
Great info here. But I need more. This is what my indicator looks like with only 2000 miles since new on ISX. While at the factory last October I asked them about restriction between the filter housing and the intake piping that Newmar installed.....they said it was fine. I was tempted to disconnect what they installed just to see if it made a difference. I have not looked at the filter. Any ideas.
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Hello Billy,
That's what my indicator looks like with only 2000 miles. Same thing happened with my last ISX600. I think it's the way that either Newmar or Spartan have run their inlet piping. I think it would be interesting to get a good gauge and get a more accurate measurement of inlet inches.
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2013 Polaris RZR 4/900
Location: Colorado
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02-15-2014, 01:17 PM
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#36
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,309
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Quote:
Originally Posted by bullheaded
Great info here. But I need more. This is what my indicator looks like with only 2000 miles since new on ISX. While at the factory last October I asked them about restriction between the filter housing and the intake piping that Newmar installed.....they said it was fine. I was tempted to disconnect what they installed just to see if it made a difference. I have not looked at the filter. Any ideas.
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Quote:
Originally Posted by nforus
Hello Billy,
That's what my indicator looks like with only 2000 miles. Same thing happened with my last ISX600. I think it's the way that either Newmar or Spartan have run their inlet piping. I think it would be interesting to get a good gauge and get a more accurate measurement of inlet inches.
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27.71 inches of water equals 1 pound of pressure, as I am reading your post and looking at your photo, you have less than 1/2 pound of air restriction on your filter. With these air flow gages, the filter and engine manufactures must want them changed out when the restriction reaches about 1 pound.
Page #104 lists the engine Manfactures limits http://india.donaldson.com/en/engine...ary/065843.pdf
Bullhead,As you can see in the chart for Cummins, the limit is 25" like the max on your guage.
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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02-15-2014, 04:34 PM
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#37
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Senior Member
Join Date: May 2013
Posts: 786
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Quote:
Originally Posted by palehorse89
27.71 inches of water equals 1 pound of pressure, as I am reading your post and looking at your photo, you have less than 1/2 pound of air restriction on your filter. With these air flow gages, the filter and engine manufactures must want them changed out when the restriction reaches about 1 pound.
Page #104 lists the engine Manfactures limits http://india.donaldson.com/en/engine...ary/065843.pdf
Bullhead,As you can see in the chart for Cummins, the limit is 25" like the max on your guage.
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Ok that makes sense, but my question is why is it already at half on a new coach? I guess if the baseline is not 0 with a new filter then that would make sense, in other words , it starts at 1/3 with a new filter?? I've always thought that these things were off in motorhomes because the Chassis mfg calibrates it for the chassis and then the motorhome mfg adds more ducting and increases the intake resistance.
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2013 Polaris RZR 4/900
Location: Colorado
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02-15-2014, 04:48 PM
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#38
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,309
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I am going to make another guess here, first, these restriction gauges are cheaply built, not accurate, just a good indicator. A brand new filter will have a certain amount of air flow restriction, not much, as seen here, I am going to venture to say that as big as these filters are that the reading will remain there in the same position for a long time of travel and use, years........unless it sucks up a lot of dust or water.
There is a ton of square inches of surface on one of these filters.......
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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02-15-2014, 05:01 PM
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#39
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Senior Member
Join Date: May 2013
Posts: 786
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Quote:
Originally Posted by palehorse89
I am going to make another guess here, first, these restriction gauges are cheaply built, not accurate, just a good indicator. A brand new filter will have a certain amount of air flow restriction, not much, as seen here, I am going to venture to say that as big as these filters are that the reading will remain there in the same position for a long time of travel and use, years........unless it sucks up a lot of dust or water.
There is a ton of square inches of surface on one of these filters.......
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I think you're right, these filters have a pretty easy life for the most part. They may take in some dust on the way in and out of a gravel RV park but other than that not much. I remember from my motorcycle days that getting a motor to breathe better( intake and exhaust) was a cheap source of increased power. I would guess that with some work a person could remove some restrictions and install smooth pipe and pick up some ponies.
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2013 Polaris RZR 4/900
Location: Colorado
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02-15-2014, 05:20 PM
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#40
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,309
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Hopefully Gary will post and tell us if our thinking is right or not...........
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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02-15-2014, 05:21 PM
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#41
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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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One only has to look up the air restriction on the filter at the CFM being used by the
engine then add 2 to that number for the max inlet restriction and you will be close
to what you should see with a new filter total.
__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
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02-15-2014, 05:56 PM
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#42
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Registered User
Freightliner Owners Club
Join Date: Sep 2005
Location: Crossville, Tennessee
Posts: 794
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SteveWV,
How did you know what sizes to order?? Did you have to cut any of the straight pipe? Did you change your filter from a straight inlet to a straight outlet filter??
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