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Old 07-12-2015, 06:28 AM   #71
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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, 02:04 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, 04:01 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, 08:19 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, 11:07 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, 07:24 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, 05:47 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, 05:52 AM   #78
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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.
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, 09:01 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, 05:40 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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Old 08-03-2015, 06:04 AM   #81
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battle tested. :)

We're BACK. Aside from a few misc things the old beast was amazing. Nearly 3000 miles door to door and we had zero major problems. I was honestly surprised and incredibly impressed with the beast. A few things I noted over the course of the journey.
We left Texas in 94 degree heat and sat in a 3 hour traffic jam in Oklahoma city. Barely moving, I had to keep the engine running the entire time. No airflow and our genny quit, so No house or dash AC. Engine temp hovered around 200 the entire time but the truck never overheated. Amazing. Also, the return journey south of Oklahoma we saw triple digit heat for most of the day. Again, the engine never ran over 190-195. And this was cruising at 60mph turning 2400 rpm for hours on end. I can't believe how cool and consistent it ran. Maybe it was the new exhaust or the high-flow waterpump. Also, the PO had the radiator vatted and pressure tested. So, my hats off to him. The engine ran so great in extreme temperatures.
Also noted. At 2400 rpm over the course of the entire trip I added MAYBE 2/3 quart of oil. Unreal. I had just swapped oil out for 20w-50 weight with one quart of Lucas. A winning combo I'll be sticking with here in the TX heat.
Genny. reletively untested and I just got it running the day before the trip. No carb tune-up or anything. Just a mixture adjustment on the idle and new oil. We ran it half the trip, from Kansas south, both directions. Never failed. While our window seals our toast and the air didn't exactly keep us cool.. it was better than nothing and the system performed admirably. GO GENNY GO.
A few misc 'problems' to be sorted after I recover for a bit. headlights don't work. Hilarious, we drove in the daylight anyway. 12v lights/blinkers etc work, just no headlights. found that out at 5AM while trying to get an early start to the day. We had to mosey back to our spot, grab a cup of coffee and wait the hr before sunrise and we were on our way with only a slight delay.
Misc item 2, our steering column threw us for a loop. I think the lock mechanism shifted about 20 degrees and I had to readjust the linkage to (barely) get us PRN and D. No Low 1 or 2. I limped home like this just fine. Other than that were had an eneventful driving experience. I'll call our motorhome battle tested for now. Awesome. Attached picture from the net is what I assume our column looks like, and I'm expecting to find the lock shaft somehow misaligned. could be that my 18 month old thought he could hang from the shifter while I wasn't looking.
Glad to be back, and can't wait to put on more miles in the future.
BG
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Old 08-03-2015, 06:07 AM   #82
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lock wheel pic. Maybe not a GM, but close enough for the general layout.

edit: OK, airforums isn't letting me upload pics at this time.
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Old 08-03-2015, 07:13 AM   #83
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Ben, glad to hear your maiden voyage was a success!

It sounds like your genset worked most of the time but you had some trouble with it quitting while stuck in traffic, is that right? Do you know what your fuel level in tank was when the genset quit? There is a separate fuel tap for the generator that is set higher than then engine fuel tap. That way your generator won't run the fuel tank down to empty.

I'm curious to see what is wrong with your steering column. I have the one from my 74 Argosy for parts or if you need the whole thing you're welcome to it.

Brad
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Old 08-03-2015, 07:29 AM   #84
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It sounds like your genset worked most of the time but you had some trouble with it quitting while stuck in traffic, is that right? Do you know what your fuel level in tank was when the genset quit? There is a separate fuel tap for the generator that is set higher than then engine fuel tap. That way your generator won't run the fuel tank down to empty.


Brad

Wow, had no idea the genset feed line was higher than the engines. I'm pretty sure we were at least 3/8 to 1/2 tank. I just assumed it stalled in the thick, stagnant air on the freeway. I have no doubt that the mixtures aren't perfect. Very possible it just ran out of fuel though. Great tip.
Keep you posted on the column, I'll document the damage when I get it pulled apart. Thanks for the parts offer, I might have to take you up on it once I see what's broken/bent. Thanks Brad!
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