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Old 03-14-2014, 05:11 PM   #61
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Re: Sojourner

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Originally Posted by sojourner
Hey Nat,
I'm not going all the way back. Gonna make a turn and go out just ahead of the rear wheel (eliminate some really weird unnatural bends). I know Diesels aren't quite as loud as gassers either especially with bigger pipes (mine looks to be 3-1/2"). I want to keep things as simple and trouble free as I can and that huge muffler is heavy and just in my way.
I was thinking of doing the same, only I wonder if exhaust at the back windows would be an issue? Have to make sure they're up when you're driving?
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Old 03-14-2014, 06:45 PM   #62
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Re: Sojourner

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Originally Posted by eyedeal.ink
I was thinking of doing the same, only I wonder if exhaust at the back windows would be an issue? Have to make sure they're up when you're driving?
Good point. I remember reading about exhaust gas exit requirements in the MTO (Ontario's DMV) documents that the exhaust must exit behind any opening that goes into the cabin. Pickups can dump the exhaust before the rear wheels, box trucks can dump exhaust underneath the vehicle behind the cab, etc. I don't remember all the details. Hell, I don't even remember if they were requirements or simply recommendations, actually Something to think about, anyhow. Nobody wants a cloud of diesel exhaust pouring in a window while stopped at an intersection.
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Old 03-15-2014, 03:00 AM   #63
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Re: Sojourner

I have even considered running the pipe up through the cabin and out the top. We used to do "dry stacks" like that on some commercial boats instead of water cooling the exhaust. Ceramic blankets make this possible. Not sure I want to go to all the trouble though (unless I get caught up in the whole deep fording thing ).

As far as the windows and fumes, we're taking out all the school bus windows and replacing with RV types from our donor travel trailer in the locations we want. There'll only be one window aft of the exhaust outlet (bedroom) and that one will be closed while traveling.
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Old 03-15-2014, 10:35 AM   #64
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Re: Sojourner

This is quite satisfactory, 2nd best to a stack but I've yet to see a good looking stack on a bus. Yarded the muffler off a long time ago too.

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Old 03-15-2014, 11:03 AM   #65
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Re: Sojourner

Cool exhaust exit in the rear bumper. I can see that being pretty easy on a rear engine. If (big "IF") I do the stack it will be through some sort of cabinet with a good amount of ceramic thermal blanket filling the whole area floor to ceiling. I'll probably just exit in front of the rear wheel. Very simple, shorter run and less bends = more efficient engine.
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Old 03-15-2014, 11:44 AM   #66
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Re: Sojourner

I'm looking at having mine exit in front of the driver side wheel also. No windows from there back, so that's a non-issue for me. Will go with the largest diameter I can stuff in and no muffler. Will likely transition from the stock 3" to 4" pipe (stainless, if I can afford it). Since the Cummins exits on the passenger side, getting it over to the driver side will probably be the trickiest part. Course...there all those tanks & things to weave around too.

Don't want it coming out on the passenger side cause that would dump the exhaust right where I hope to be sitting under an awning sipping rum drinks and there are times when running the engine while camped is a necessity. Also looking into a removable riser stack similar to what is avail for gennies that can be put in place while parked to get the fumes up higher.

Seen some nifty fixed stacks, just don't forget the "flapper". Not only keeps rain out, but I've heard of birds & critters moving into stacks if the unit sat for very long.
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Old 03-15-2014, 09:38 PM   #67
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Re: Sojourner

Quote:
I'm looking at having mine exit in front of the driver side wheel also.
I'm coming out the passenger side here. Can't honestly see why I'd have to run the engine much while boondocking (doing solar for power and wood for heat). As Nat stated getting the pipe out the other side will be problematic. The main issue will be going under the driveline. You'd be better off coming out at the rear of the axle and then making the crossover. Personally I'm planning on putting my water tank (55 gallon drum) just aft of the differential between the frame rails.
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Old 03-16-2014, 12:20 AM   #68
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Re: Sojourner

Actually, I,m looking at putting the crossover above the bell housing rather than under anything. Given the way the exhaust exits the turbo on mine, it looks like it might make for a cleaner arrangement.

But then, I haven't started bending any pipe yet either!
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Old 03-16-2014, 07:31 AM   #69
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Re: Sojourner

Tango,
What model do you have? I'm assuming a front engine. You might be careful when considering that option. The highest heat you have is right out of the turbo. Running that close to the floor might cause a fire and even heat issues with the transmission. I don't think any of us relish the idea of a fellow skoolie "flaming out". There typically isn't that much room between the floor and bell housing for air circulation to cool the pipe. One thing's for sure, it's gonna be a tricky pipe bending job with the larger pipe bends. Probably a better option is to use close bends and weld the whole system together.
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Old 03-16-2014, 11:06 AM   #70
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Re: Sojourner

Hey Tango, Sojourner has a point about the heat load. My bus has a water cooled crossover behind the cyl head and above the torque converter and I had to go to all sorts of extremes to keep the heat out of the bus body. I think I'm going to cross my pipe over just under the center joint in my drive shaft and then terminate it where you plan to. With our short wheel bases I don't see any problem with high centering as even with a 4" pipe the pipe is still well above the body line at the center of the bus.
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