transit roof exhaust pipe(two of them?)

[CrabbyMilton]

I was in Chicago Saturday and rode on a PACE suburban ENC bus(part of the REV group) and I noticed that this bus and others like it had what appeared to have 2 exhaust pipes side by side. Would this by chance have something to do with emission equipment? I've seen school buses with these as well only at ground level and the second pipe was smaller.
Here is a picture of the same type bus I rode.
http://eldorado-ca.com/wp-content/uploads/2016/07/ENC-Axess.pdf

[TomC]

If the bus is powered by LNG the pressure relief from the tank could be the second exhaust pipe. Good Luck, TomC

[Gary Hatt - Publisher BCM]

I think I will do the same with my 67 Eagle.  Install an extra exhaust pipe to make people think I have a newer bus. Then I will plumb in my generator so I can make smoke come out of it to make it look more real. 

[dtcerrato]

I like the dual exhaust that comes out under the ds bumper on our IL671NA. It's real though. Still a turtle but wouldn't trade the sound for anything. (Well almost) :-).

[CrabbyMilton]

It was a diesel. After I posted that and further thought, perhaps it's an air intake pipe.

[Iceni John]

It was a diesel. After I posted that and further thought, perhaps it's an air intake pipe.

Surely one wouldn't have the air intake so close to the exhaust?   (Not unless it's a new approach to EGR?!)

John

[CrabbyMilton]

Well I'm stumped now. The only thing I could find is an auxiliary heater. WEBESTO type that requires a exhaust pipe only this time it goes up thru the roof right next to the engine exhaust pipe. Can't find any pictures yet.

[Runcutter]

I'm at a transit conference, and ran into a REV group guy last night in the hotel.  I asked him, he suggested that, if it was a smaller diameter (1 inch?), it was probably the Webasto exhaust.  He specifically mentioned PACE, the Chicago suburban transit authority.  The trade show itself opens later this day, and I have a need to talk to the ENC folks (part of the REV group).  I'll try to find out for sure.

Arthur

[CrabbyMilton]

That sounds great and talk about timing and him referencing PACE.
I couldn't quite tell the size of that pipe but it was pretty big and chrome just like the exhaust pipe.
If you run into him fine but don't go out of your way just have a good time.
Thanks regardless.

[Oonrahnjay]

    REV Group.   Fine American company ...

[buswarrior]

The bigger Webasto/Proheat coolant heaters have sizeable exhaust pipes.

Chicago is cold, a transit bus idling in traffic makes little heat, doors constantly open, needs the bigger "helper" to keep everyone and the emissions equipment happy.

A smaller DBW 2010 calls for 1 1/3"  inside diameter, the bigger DBW 2020 or 300 use 2 3/4 inch exhaust pipe.

happy coaching!
buswarrior

[CrabbyMilton]

It certainly is adding up as to what it is. We'll see if Runcutter found out anything.
Thanks guys!!

[Runcutter]

I had some business with the REV group folks at the trade show last night, but nobody from ENC/EZ-Rider was there - just other divisions.  Thus, no definitive answer, but the common conjecture was Webasto exhaust.

Arthur

[CrabbyMilton]

That's fine. I appreciate your willingness to help satisfy my curious nature.
Hope you had a nice time there.

[sledhead]

I put a stainless stack on my coach to get rid of that nasty stink from the Webasto exhaust . WOW ! works awesome

dave