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Old 11-11-2014, 09:06 PM   #1
Bus Nut
Join Date: Jul 2011
Location: Virginia
Posts: 548
Generator Exhaust Routing?

Question: Can the generator exhaust be connected to the main engine exhaust and work without causing any issues? More specifically, if the generator is run while the bus engine is running will the larger bus exhaust flow cause any issue with the generator or it's exhaust flow? Seems like it would be much easier and safer to connect the generator exhaust to the bus exhaust to use the same common exhaust outlet.

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Old 11-11-2014, 11:13 PM   #2
Bus Geek
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Join Date: Apr 2012
Location: So Cal
Posts: 3,233
Year: 1935
Coachwork: Superior
Chassis: Chevy
Engine: 317 ci/tid / Isuzu
Re: Generator Exhaust Routing?

You probably will have back pressure problems with the bus and genny running and without a doubt you will be feeding bus exhaust back through the genny if the bus is running and genny is off. I had the same idea and went with two exhaust systems. There are a couple of other considerations such as sizing the genny exhaust pipe to maintain just enough flow resistance to keep the genny exhaust pulses tightly packed and therefore quieter. Funny how nothing is ever simple!?!
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Old 11-12-2014, 11:05 AM   #3
Bus Nut
Join Date: Jul 2011
Location: Virginia
Posts: 548
Re: Generator Exhaust Routing?

That's what I was wondering about...pressures, venturi effect from the larger bus exhaust flow, etc. Good info, thanks.
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Old 11-12-2014, 05:57 PM   #4
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Join Date: Sep 2013
Location: Vacaville, Ca
Posts: 1,634
Year: 1988
Coachwork: Crown / Pusher
Engine: 8.3 Cummins
Re: Generator Exhaust Routing?

If you were to angle the genny exhaust at a 45 deg angle facing towards the exit wouldn't the pulses from the Bus exhaust help pull the genny exhaust? I can see if you tied in at a 90 deg you might pressurise the genny but the 90 deg should be ok
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Old 11-14-2014, 11:45 PM   #5
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Join Date: Jul 2013
Location: Danville, California
Posts: 345
Year: 1988
Coachwork: Crown
Chassis: Supercoach
Engine: DD6-71T
Rated Cap: 78
Re: Generator Exhaust Routing?

I am not an engineer. However, I have never seen a Class A motor home with generator exhaust hooked up to the main engine exhaust. There has to be a very good reason. Too many unintended consequences could come from this.
Greg and Donna Marvel

Danville, California
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