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Old 06-03-2014, 06:45 PM   #1
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Air Intake Restriction

We purchased a 2005 Inspire 36' with a 400 Cat about 2 years ago. One of the first things I noted was a high intake restriction on the gauge. I installed a new filter thinking it may be clogged. Every time I pulled a hill, the restriction gauge maxed out. I have checked every inch of the intake system and cannot find anything that would cause a restriction. I changed the filter again thinking the filter was causing the problem. 'Still have same situation. I installed a new restriction gauge with no improvement. I have been thinking the outside air intake could be the culprit. Has anyone else had or heard of this problem?
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Old 06-03-2014, 06:50 PM   #2
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Quote:
Originally Posted by Jerry View Post
We purchased a 2005 Inspire 36' with a 400 Cat about 2 years ago. One of the first things I noted was a high intake restriction on the gauge. I installed a new filter thinking it may be clogged. Every time I pulled a hill, the restriction gauge maxed out. I have checked every inch of the intake system and cannot find anything that would cause a restriction. I changed the filter again thinking the filter was causing the problem. 'Still have same situation. I installed a new restriction gauge with no improvement. I have been thinking the outside air intake could be the culprit. Has anyone else had or heard of this problem?

What is the size of the input and output of the filter? The intake tubing should be approx the same. If the tubing is necked down either before or after the filter then the restriction is likely the tubing and not the filter.


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Old 06-03-2014, 07:49 PM   #3
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My Airstream is just the same - always sits close to the red mark on the filter minder. New filter and it is a bit lower, but within a couple of weeks it is back up again.

Problem is the filter size is small for the engine - and the air intake is low down just behind drive wheels.
The cost - $150 - doesn't encourage regular change
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Old 06-03-2014, 08:00 PM   #4
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I have been looking at the small intake box on the side of mine thinking, "that's got to be restricting flow," not sure how to prove it or improve it though.
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Old 06-03-2014, 08:20 PM   #5
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Could be a bird has built a nest inside the tube that goes from the box to filter. If you have put a chip in it to increase the hp that will also cause it to do that.
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Old 06-04-2014, 08:54 AM   #6
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The following link should be of help.

http://pdf.cat.com/cda/files/3375362...EBW4969-04.pdf
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Old 06-04-2014, 01:49 PM   #7
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As Dale stated the builders of these MH's put the smallest filter and air intake inlet they can.
In some cases one can change it to a much improved system however one has to take the measurements of the intake opening, size of intake hose to filter and any elbows, filter size and CFM rating, and filter outlet size to turbo.
The most common faults found are intake opening to small, connecting hose used to filter ribbed flex hose or to small, filter to small, filter output hose to turbo to small.
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Old 06-04-2014, 06:10 PM   #8
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Air Intake Restriction

If I remember correctly, the inlet and outlet are both 6". I will have some time tomorrow and I will measure both. Also, thanks for the Cat bulletin! I will read it and see if mine conforms to their guidelines. Thanks for everyone's help and ideas!
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Old 06-04-2014, 06:37 PM   #9
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I'm not trying to say that anyone here is right or wrong, but I will say that - in my experience - filter gauges are borderline worthless. They very rarely display a proper reading of the filter. I've seen trucks throw a code for an air intake system restriction because the air filter had over 1/8" of dirt build up on it, but the gauge read it was a like new filter. I've also seen the opposite, filter was new and the gauge shows it's clogged.

Just my $0.02.
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