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Old 03-02-2013, 01:06 PM   #1
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question on air intake temp

What is your intake air temp? On my Cummins ISB 275 it's roughly 119 when idling and 114 when driving. This is when outside temperature is 80*

I've washed my radiator and CAC multiple times and I cannot get it lower. Water temperature stays between 182 and 188.

What is your intake air temp?
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Old 03-02-2013, 01:25 PM   #2
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that seams low
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Old 03-02-2013, 01:36 PM   #3
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My intake runs very close to outside air temp.
Your water temp is good but you are over what cummins wants for max intake air
temp.(Not more than 30 degrees F above outside air temp)
You might want to look and see if there is missing ducting or some other reason
you are not getting the best air flow thru the CAC.
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Old 03-02-2013, 03:57 PM   #4
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Ok I went back out and inspected all ducting with soapy water and no bubbles.

I then washed the CAC two more times.

I let it high idle for about 30 minutes and outside air temperature was 87* and intake air temp was 116*.

Maybe it's just really dirty. I think I'll wash it a couple more times tomorrow.
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Old 03-02-2013, 04:58 PM   #5
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First: what are you using to wash it?
Second: sitting at a high idle is not the way to check it. You need to be moving
down the road other wise all you are doing is blowing hot engine air which I bet
is well above 87
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Old 03-02-2013, 05:30 PM   #6
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Used Simple Green first and then Dawn dish soap.

Idle temperature and driving temperature are not very different. Few degrees at best.
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Old 03-03-2013, 05:28 AM   #7
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[QUOTE
Idle temperature and driving temperature are not very different. Few degrees at best.[/QUOTE]

And you know this how?
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Old 03-03-2013, 05:44 AM   #8
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[QUOTE=Zoafan;1482175]Used Simple Green first and then Dawn dish soap.

I found that the normal Simple Green did not work all that well, yes it
cleans but leaves a lot.
What does work like a champ is Simple Green Pro HD heavy duty clearner
It is purple in color and one of the few cleaners that are ok for use on
aircraft.( will not damage aluminum or plastic)
You mix it 50/50 and soak the item let stand 10 to 15 minutes then flush,
do not let dry before flushing.
I get it at one of the large hardware stores.
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Old 03-03-2013, 11:43 AM   #9
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Quote:
Originally Posted by wb7auk View Post

And you know this how?
I have a scanguage d which tells me what my intake air temperature is
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Old 03-03-2013, 12:15 PM   #10
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You would be surprised what you would find with the engine compartment temp
when left at high idle for a long period of time and what it shows at hwy speeds.
It has to do with hot air rises and in the case of our MH with no way for the air
to exit other than the fan or the little down by the frame.
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