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Old 10-18-2014, 04:10 AM   #1
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Cummins 400 Exhaust Gas Temperature

I was wondering if anyone can tell me the temperature of the exhaust gas AT IDLE of my Cummins 400. I want to vent the exhaust from the tailpipe out of the garage when idling. Also, is there an EGT sensor kit or system I can install to monitor EGT? I currently tow a Ford Flex but am considering downsizing to something much smaller and lighter.
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Old 10-18-2014, 04:23 AM   #2
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I doubt it's more than 200 degrees. With that said, if it's a 07+ it likely has a DPF. If so, the exhaust temps can be much higher during active regeneration.
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Old 10-18-2014, 04:55 AM   #3
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Quote:
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Also, is there an EGT sensor kit or system I can install to monitor EGT?
Google it... There are 100's of them $100-200...Installation will be $4-600.
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Old 10-19-2014, 06:51 PM   #4
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Scan gauge does get egt and many other things, worth looking into that or similar.
Plugs into diagnostic plug that should be near the steering wheel
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Old 10-19-2014, 08:11 PM   #5
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The temperature in the exhaust manifold at idle will drop to 375° after being driven, then allowed to idle for 2-3 minutes, according to the pyrometer I installed.

ISSPRO and banks both make pyrometers. You must drill and tap threads in the exhaust manifold, as there is no factory exhaust probe. There is no data on the J1939 can bus backbone. So, you must do the above to get a temperature reading.
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Old 10-19-2014, 08:16 PM   #6
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If you dare, borrow your wife's cooking thermometer and insert the end in the exhaust outlet. Might need to clip it somehow. Let us know the temperature reading you get. (I am assuming she does the cooking, but I've been wrong before.)
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Old 10-20-2014, 06:34 AM   #7
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The Cummins engine in question is in a 2003 correct? Seems like the plug would be 1939. My 2001 Cummins send a bunch of data.

I bought an Issepro Gauge to install but when I saw how easy the Scan Gauge D installed I bought one of those. The Issepro sits on a shelf.
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Old 10-20-2014, 08:38 AM   #8
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I'll second the thinking that you would need to tap the exhaust side to get a reading. The 2003 CAPS era ISL in our coach, sends Intake Temp to our Silverleaf, does not have Exhaust/EGT.

It is good info to have, but unless you have modded your engine, you probably don't need it. If you have modded (chipped/flashed, propane/methanol/water injected, etc.) then I feel that is part of the overall costs of these mods from stock. EGT is a very good way to monitor what your engine is going thru as you drive.

For the exhaust temps out the pipe, I'd think they be pretty low too. The infrared temp guns are not expensive, and that would help you get your temps. I know one gent that vents outside, just bought some rain gutter aluminum runs. And he built a large enough female end to slide over the exhaust pipe out of a coffee can, aluminum taped to the rain gutters. Not pretty but does OK, even stepping down to the smaller diameter of the rain gutter, no problem for what he is doing.

Best of luck,
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Old 10-20-2014, 01:06 PM   #9
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Quote:
Originally Posted by hillboy View Post
The Cummins engine in question is in a 2003 correct? Seems like the plug would be 1939. My 2001 Cummins send a bunch of data.

I bought an Issepro Gauge to install but when I saw how easy the Scan Gauge D installed I bought one of those. The Issepro sits on a shelf.
Lots of variety I guess. Mine is a 350 CAPS Cummins. I went to Cummins and they gave me a list of diagnostics available to a scan gauge D Egt was one and it shows on my gauge when going down the road. All I had to do to connect was reach in next to the steering post and plug in. The scangaugeD plug has two connector faces and will connect to J1708 or J1939.
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Old 10-20-2014, 03:18 PM   #10
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Depends on how far and how long you wish to run I guess.

I use a piece of 4" Aluminum Dryer Vent (the expandable/flexible type) which gives me about 6' of length which is enough to run outside the door. I have run for 15-20 minutes with no problem.
It's cheap and gets the job done. As far as temperature at the outlet, my guess is around 200-250 deg. at idle.
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Old 10-21-2014, 05:37 AM   #11
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Lots of variety I guess. Mine is a 350 CAPS Cummins. I went to Cummins and they gave me a list of diagnostics available to a scan gauge D Egt was one and it shows on my gauge when going down the road. All I had to do to connect was reach in next to the steering post and plug in. The scangaugeD plug has two connector faces and will connect to J1708 or J1939.


Ok I need to point out a confusion on my part. Senior moment I suppose.

I posted that my scan gauge D would report EGT from my CAPS engine. Not accurate, wrong. The Scan gauge I installed was an easy fix for my search for a BOOST Gauge. That function works fine. The EGT reading I get comes from a digital gauge just above my scan gauge readout. I installed them both so I should have caught the error. Sorry about that.

No more late night posting for me.
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Old 10-25-2014, 12:39 AM   #12
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The Banks Pyro that came with our Banks kit runs about 400° on the flats, at 60 mph and 10 psi boost. Have never really looked at it at idle. I have seen 1300° on hard pulls.
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