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post #1 of 32 Old 11-15-2011, 07:21 AM Thread Starter
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Going to run an experiment today

I have a test vehicle in the shop. It’s a class A diesel pusher motor-home powered by a 450hp Cummins ISL. The truck is 2010 emissions compliant with DPF/SCR combo and DEF. I was talking with a co-worker and we wondered how long the engine would run, solely on its own exhaust.

So, I’m going to start the engine on atmosphere air, then hook and exhaust hose from the SCR directly to the intake and see what happens. They claim that the exhaust coming from this set up is cleaner than the air it’s taking in when it’s run in high smog cities.

Stay tuned!

Jason

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post #2 of 32 Old 11-15-2011, 09:52 AM Thread Starter
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OK we ran the little experiment.

It only took me a few minutes to rig up a box to feed the exhaust gas into the intake plenum but it drew a lot of attention for the engineering staff as to what would happen. The engine already has an EGR system but we just made it 100% EGR.

There were numerous theories on what would happen including:

Wouldn't run at all - would run for 5 + minutes - no change - check engine/stop engine lights

The experiment was only run at idle.

So what do you think was the result? I wanted to see what other's opinions were before I told the results.

Jason

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Great White - 2003 7.3l F-250 4x4 CCSB -102,000 miles and tickin
DIY intake - 4" Straight pipe - HPX - CAT ELC - 203° t stat - billet t stat housing - coolant filter - dual alt radiator hose - 12V Air compressor - 5 gallon air tank - Air line quick connects - AIR HORNS!

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post #3 of 32 Old 11-15-2011, 10:10 AM
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I bet it ran decent. Maybe not as well as with the cool air. But definitely ran.



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post #4 of 32 Old 11-15-2011, 10:15 AM
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No idea but I would like to know.

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post #5 of 32 Old 11-15-2011, 10:28 AM
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i'd bet in a completely closed system it wouldnt run very long at all, as the original starting air is only 20% oxygen, it won't take very long to deplete.

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post #6 of 32 Old 11-15-2011, 04:32 PM
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Very true.

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2008 Ford F-450, TumbleWeed Headache Rack, B&W Gooseneck, 15% tinted windows, 120 Gal Transfer tank, Cobra 29 LX CB, 1200 watt converter, PIAA lights, Sinister goodies, S&B Intake and lots of running lights.

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post #7 of 32 Old 11-15-2011, 04:39 PM
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I say less than a minute....

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post #8 of 32 Old 11-15-2011, 04:42 PM
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I agree - With burning the oxygen (one of the needed components for fuel burning), it isn't going to run well very long. It will start running like crap until it dies.


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post #9 of 32 Old 11-15-2011, 05:29 PM Thread Starter
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This all started as a joke. An engineer said "If these engines run so clean they should be able to run on their own exhaust". That started the gears turning with a co-worker and I. I figured let's try it. Here is what our little experitment looked like.



Simple yes but I do have a masters in cardboard and duck tape .

I thought it was interesting and should share with my diesel buddies. We need a little more input before I tell what happened. Some are on the right path though!

Jason

O.T.F.D. Volunteer 19

Great White - 2003 7.3l F-250 4x4 CCSB -102,000 miles and tickin
DIY intake - 4" Straight pipe - HPX - CAT ELC - 203° t stat - billet t stat housing - coolant filter - dual alt radiator hose - 12V Air compressor - 5 gallon air tank - Air line quick connects - AIR HORNS!

Hers: 2013 VW Jetta TDI

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post #10 of 32 Old 11-15-2011, 05:33 PM
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i def wanna know what happened, supscribed

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