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Old 07-10-2015, 07:07 AM   #61
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1978 28' Argosy 28
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video, attempt #2.

Fail. 2 minute video must be too long. I'll take another stab at it later today.
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Old 07-10-2015, 07:39 AM   #62
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Question for you: Does the exhaust for your engine/onboard generator come out on the same side of your Argosy as the door? Ours does. We're thinking about the possibility of extending the exhaust up the side of the rv so it comes out above the rv.
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Old 07-10-2015, 08:07 AM   #63
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Yes, ours dumps directly out the back of the RV on the passenger side. We've honestly never used it while boondocking so I don't know if we have a fume issue. I wouldn't think it would be a problem to relocate the exhaust dump with a little creativity.
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Old 07-10-2015, 10:55 AM   #64
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Click image for larger version

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A couple shots anyhow until I figure out the video uplink.
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Old 07-10-2015, 02:08 PM   #65
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vid test three..
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Old 07-10-2015, 02:18 PM   #66
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My '82 280 has the GenSet exhaust coming out the passenger side. It is impossible for me to run the GenSet at all with any window, vent or door open. I will get fumes inside immediately and the CO detector will sound. The trick is to vent the exhaust above the roof. I have made my own "Ven-Turi" to connect to the exhaust pipe when needed. I have used it successfully at Burning Man and Yosemite. They are available commercially. If you make your own you just have to be aware of the materials you use so they don't burn or melt and be aware of creating too much back pressure when using a longer exhaust pipe run of insufficient diameter.

CO poisoning is a serious thing and it can happen quickly.

Quote:
Originally Posted by Seridia View Post
Question for you: Does the exhaust for your engine/onboard generator come out on the same side of your Argosy as the door? Ours does. We're thinking about the possibility of extending the exhaust up the side of the rv so it comes out above the rv.
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Old 07-10-2015, 02:22 PM   #67
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Ben, your exhaust looks great! It's just like the Banks System. Adding headers will be easy in the future.

I tried to view your video, but it gives an error.
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Old 07-10-2015, 05:58 PM   #68
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Ben, the exhaust looks great! Can you locate the part number for the muffler? I've been poking around on google and have not been able to find anything similar.

Brad
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Old 07-10-2015, 07:45 PM   #69
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Brad, don't see a part number stamped in the muffler. Receipt says its a Magnaflow XL series Round muffler. I bet its a fleet vehicle muffler. 2.5" dual inlet, 3.5" single outlet.

http://www.magnaflow.com/02product/s...=main&id=10446


This seems odd, but I thought I actually had less power on the way home today with the new exhaust. Might just be my imagination as I can't really imagine the exhaust is restrictive. The engine just isn't THAT big. But, ran smooth on the way home.
Also dropped down one metering rod on the carb to return it to sea level and tuned the idle mixture with a vac meter. Both didn't seem to do much. But, overall the engine runs well. I'll take another stab or two at videos of the exhaust before I give up.
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Old 07-10-2015, 07:56 PM   #70
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OK. LAST try at a video.
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Old 07-12-2015, 05:28 AM   #71
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Quote:
Originally Posted by bpg_austin View Post
Brad, don't see a part number stamped in the muffler. Receipt says its a Magnaflow XL series Round muffler. I bet its a fleet vehicle muffler. 2.5" dual inlet, 3.5" single outlet.

MagnaFlow Exhaust Products - For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles
Thanks for the link. Is that a 3" outlet or 3.5" outlet?

Quote:
This seems odd, but I thought I actually had less power on the way home today with the new exhaust. Might just be my imagination as I can't really imagine the exhaust is restrictive. The engine just isn't THAT big. But, ran smooth on the way home.
I've noticed the same thing on vehicles after a new exhaust was installed. I'm probably wrong but I attribute that to a new exhaust will likely be more restrictive than a rusted out free flowing exhaust system. The only time I noticed an improvement was on my F350 diesel where they installed the correct size tubing which allowed for better flow. Some PO had installed smaller pipes which was affecting power/performance. After the change the performance and power went up as did the fuel mileage.

Quote:
Also dropped down one metering rod on the carb to return it to sea level and tuned the idle mixture with a vac meter. Both didn't seem to do much. But, overall the engine runs well. I'll take another stab or two at videos of the exhaust before I give up.
What carburetor are you running?
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Old 07-12-2015, 01:04 PM   #72
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Brad, its a 3.5" outlet from the muffler. I actually looked at m inlaws F-350 last night with the 7.3L Diesel. Looked to me to have about the same setup with a 2 into 1 exhaust. Looked to be 3.5" also. I'm surprised that there may be a restriction here causing a slight loss of power. I'm not planning on changing the setup right now. It still runs well, has enough (marginal!) power and cruises at 60mph. Good enough for now.
Carb is and Edelbrock 750cfm. I believe its a 1407 or 1411. Manual choke. I love this carb. Super easy to swap out metering rods and jets. Easy to tune and gives great throttle response.
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Old 07-12-2015, 03:01 PM   #73
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http://www.airforums.com/forums/f448...se-138050.html

Also having a generator problem posted in the tech section if anyone can help. Thanks.
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Old 07-12-2015, 07:19 PM   #74
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One other thought on your power loss. Is it possible since it's not as noisy that you just think it's lacking power? Noise equals power, right?!

I have the Edelbrock 1406 on my 454. I have no experience with this carb and for obvious reasons have not been able to go for a test drive with it!
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Old 07-14-2015, 10:07 AM   #75
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http://youtu.be/3mCB5SDw-Xw

Ah ha. Wife put up a YouTube video of my exhaust walk-around. Let's try this.
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Old 07-15-2015, 06:24 PM   #76
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Ben,

That doesn't sound bad at all. That will likely be my muffler of choice once I get to that point. The Thorley headers that I've bought are 2.5" outlet so the muffler would match up nicely.

Thanks for posting the video.

Brad
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Old 07-16-2015, 04:47 AM   #77
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Thanks Brad. The one thing I'd do different if I did this kind of exhaust again would be to have the 3.5" outlet run over the axle and exit at the rear of the motorhome. It would add some cost but decrease the sound quite a bit. With it exiting in front of the tires, and the windows open in the motorhome while we drive, I get quite a bit of exhaust sound. On a longer trip it can be annoying. With a motorhome, designed to chug along at 60mph I'm not interested in having people hear my big block. Silent is better. Your 350 might not be a problem as its probably going to be quieter by default.
Just some thoughts.
BG
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Old 07-16-2015, 04:52 AM   #78
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Originally Posted by bpg_austin View Post
Thanks Brad. The one thing I'd do different if I did this kind of exhaust again would be to have the 3.5" outlet run over the axle and exit at the rear of the motorhome. It would add some cost but decrease the sound quite a bit. With it exiting in front of the tires, and the windows open in the motorhome while we drive, I get quite a bit of exhaust sound. On a longer trip it can be annoying. With a motorhome, designed to chug along at 60mph I'm not interested in having people hear my big block. Silent is better.
Interesting. On the 310 you couldn't really hear it running or at least it wasn't very loud. Possibly the muffler isn't as quiet (or as large) as the Banks provided muffler. I do like your idea of extending past the rear axle. On my 20' that's really not much greater of a distance.

Of course I never ran with any of the windows open either!

Quote:
Your 350 might not be a problem as its probably going to be quieter by default.
Just some thoughts.
BG
Actually I have a 454 with a towing cam installed so it will be interesting to hear how it sounds once the motor is installed and I have an exhaust system!

Brad
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Old 07-30-2015, 08:01 PM   #79
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Ben's '78 Argosy thread

Well, about to leave Minnesota and make our way back home. My shift column somehow has gotten out of alignment and I've had to crawl underneath a few times to get it into park. I'm sure easily solvable but the column will need to be pulled. It's not a linkage problem. Otherwise only a few small issues so far! We've put on nearly 2000 miles in the past 8 days. Full report later next week when we're back in Texas. Old girl has done remarkably well.
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Old 07-31-2015, 04:40 AM   #80
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Ben, glad to hear things are going well

I replaced the steering column in my 74 Argosy with the one out of the an 86 345 so if you're in need of parts or the complete column my old one is available.

Brad
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