Muffler recommendation
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=97993
Printed Date: Apr/23/2024 at 6:46pm
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com
Topic: Muffler recommendation
Posted By: Ambassador66
Subject: Muffler recommendation
Date Posted: Jan/05/2019 at 5:10pm
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I ran a can of the aerosol Sea Foam through the carb today. After the hot soak it fired up and there was a nasty bang followed by my Ambassador sounding like a track ready AMX. Not a totally horrible thing but not what I want. I rolled forward to find two solid hand fulls of rust and metal shards. I took a look under the car and found a nice 6" x 6" hole in my muffler. Any recommendations on where to find a replacement? Recommended brands? Without pulling it off inlet and outlet size? 66 Ambassador 990 / 327 2 bbl.
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Replies:
Posted By: amx007
Date Posted: Jan/05/2019 at 5:37pm
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I just put some thrush on , they sound just right ------------- dream red white and blue 1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
Posted By: Ambassador66
Date Posted: Jan/05/2019 at 6:44pm
The welded or the hush? Not sure I'm a fan of the turbo.
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amx007 wrote:Posted By: tufcj
Date Posted: Jan/05/2019 at 7:31pm
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This is almost like an oil thread. Everyone has their favorite. I have 2 Magnaflows (2.5") on my AMX. Nice rumble out the back, but quiet enough that I can hear the radio going down the highway. They don't drone either. Bob tufcj ------------- 69 AMX 74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
Posted By: ADAM12MATADOR
Date Posted: Jan/05/2019 at 7:38pm
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I have Flowmaster 3 chamber mufflers on my cop car. Just the right tone for me. |
Posted By: amx007
Date Posted: Jan/05/2019 at 7:39pm
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welded as it’s all part of new exhaust system but no crosover kinda wishing I did on my 290 auto car
------------- dream red white and blue 1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
Posted By: Ambassador66
Date Posted: Jan/05/2019 at 11:30pm
Where do I see pictures of the cop car?
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Posted By: bob401
Date Posted: Jan/07/2019 at 9:04pm
| 2 Flowmaster 40 series Mufflers dumped before the rear axle. Loud enough to get the attention of the car next to you when you start it. pretty much an intolerable drone at 3500 RPM.. needs a 400 watt stereo playing about 80 or 90 decibels to overcome the Drone. It's not race car loud though. That is definitely a different type of loud... |
Posted By: WesternRed
Date Posted: Jan/07/2019 at 9:19pm
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If you don't have callipers, measure the circumference of the pipe with a dress makers tape and divide by pi (3.14) to get the diameter. Go stainless for the mufflers if you want durability, but make sure the insides are stainless as well and not just the fancy case. For a stock daily, chambered will be fine and keep it quiet, turbo mufflers if you want a little bit of rumble. Otherwise get a couple of these and some 3" pipe to match for the full race car effect:   ------------- I've finally given up drinking for good...........now I only drink for evil. |
Posted By: FSJunkie
Date Posted: Jan/08/2019 at 1:54am
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Find a catalog of Walker Quiet Flow SS mufflers, or Walker turbo mufflers. Pick out the largest one by case volume that will fit under the car and install it. Then install a second full size muffler or resonator somewhere else in the pipe. So it sounds like a high quality luxury automobile. Meaning it makes no sound at all. I like cruising down the highway at 80 MPH in silent, smooth comfort while I listen to Vivaldi's four seasons on the stereo, played from my phone. If you listen carefully, the violins in la Primavera sound like birds chirping in the trees. Can't hear that with glass packs. ------------- 1955 Packard 1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
Posted By: WesternRed
Date Posted: Jan/08/2019 at 7:23am
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Ha ha, if I wanted to ride in silence, I would just buy an electric car. ------------- I've finally given up drinking for good...........now I only drink for evil. |
Posted By: amx007
Date Posted: Jan/08/2019 at 8:46am
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I would listen to highway star the rumble goes well with it ------------- dream red white and blue 1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
Posted By: Doug in New Freedom
Date Posted: Jan/08/2019 at 9:04am
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I put THRUSH Mufflers on my '68 AMX with a 343, and my '69 C10 Pickup with the 350V8 they are affordable, cost wise. The Idle Rumble is a beautiful note and when rolling I don't hear them much unless I floor it. ------------- Doug in New Freedom 68 AMX 69 CHEVY C1O PICKUP 74 PORSCHE 914 84 K5 BLAZER |
Posted By: 6PakBee
Date Posted: Jan/08/2019 at 9:23am
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I go down to NAPA and ask for a stock replacement. ------------- Roger Gazur 1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
Posted By: The Anti Chrysler
Date Posted: Jan/08/2019 at 2:14pm
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I'd go to an exhaust shop and ask them to install a new muffler. |
Posted By: Ambassador66
Date Posted: Jan/08/2019 at 6:38pm
Thanks for the math reminder. I want to know I have a little beef but not so much it takes away from the summer drive with top down. I'll look for chambered.
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Posted By: Ambassador66
Date Posted: Jan/08/2019 at 6:44pm
| I'll add Walker and flow master to the list. One premise of the car was that I would do all the work since cash flow is minimal for toys. I'd be sleeping in it if I said I was taking it to a shop for a muffler. |
Posted By: purple72Gremlin
Date Posted: Jan/08/2019 at 6:55pm
| Just me...not going to say anything about mufflers. But put tailpipes on it. If you want it quiet...put a balance tube on it. That will help. Some people want to hear it, others dont. |
Posted By: ccowx
Date Posted: Jan/08/2019 at 7:23pm
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Ok, here is a serious answer! The pipes are 2" for the stock system. If you use a 3 chamber muffler you will get a fairly quiet vehicle, especially with the small stock pipes. Unless you are racing an Ambassador, that should be fine. Straight through types are good for restriction, but if you are going that route, you probably could use some bigger pipes anyway. Are you just replacing the pipes or the entire system? If mufflers only, go with 3 chamber. If replacing, perhaps a 2-1/4" complete system with something a bit noisier for a muffler. Personally I use Magnaflow welded body versions, straight through, but you should be fine with 3 chamber types. Chris
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Posted By: Ambassador66
Date Posted: Jan/08/2019 at 8:33pm
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Thank you Chris for the straight and skinny. I have a lot more pressing issues under the hood right now. My main goal is to have a decent muffler so the whole neighborhood doesn't know I'm on my way home at midnight. In a few weeks we have shift change and I'll be leaving at 4:30am. It's the whole most bang for the buck scenario. The end goal is daily driveability and reliability. Worst case any given day I walk the 2 miles to work.
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Posted By: Ram Air Rick
Date Posted: Jan/08/2019 at 9:13pm
In typical practical fashion, you're the only one here that actually gave the OP a path to answer his original question !  Rich C.
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Posted By: The Anti Chrysler
Date Posted: Jan/08/2019 at 11:13pm
Did you miss the part where I suggested just going to an exhaust shop? If there is one area where DIY just isn't worth it, it's exhaust.
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Posted By: Ram Air Rick
Date Posted: Jan/09/2019 at 4:54am
No, I saw your post, and that's how I handle those situations now. I thought your suggestion was a good one, but the OP was looking for info for a muffler for his car not a service. Rich C.
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Posted By: 401MATCOUPE
Date Posted: Jan/09/2019 at 6:33am
I have found that NAPA has a great catalog of mufflers and some that are extremely close to original AMC dimensions.......I highly recommend you try that as Ram Air Rick and 6 Pac Bee have also suggested. ------------- Ross K. Peterson 68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
Posted By: Sonic Silver
Date Posted: Jan/09/2019 at 8:43am
| For my 1970 AMX, I went to Midas in 1987 and got 2 lifetime mufflers. They are still on the car, 30+ years later. |
Posted By: Greyhounds_AMX
Date Posted: Jan/13/2019 at 2:48pm
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If you are looking for "bang for the buck", its very hard to beat Dynomax Super Turbo. I doubt you can find more flow at lower cost, and they sound pretty good. If you want a more stock sound but the same high flow capacity , they offer larger case versions. ------------- 1968 AMX 390 w/T5 |
Posted By: White70JavelinSST
Date Posted: Jan/14/2019 at 8:41am
Curiously enough, the White70 has had several mufflers and tail pipes over the years. I've had the car since 1972. It has 140K miles on it. However the original cross over pipe after the exhaust manifolds is original to the car. All of it except about four to six inches where the last muffler shop shortened the pipe right before it goes into the muffler because it was getting rotten there. Weird huh. The car will be officially 50 years old this December. I am still searching for the best sounding muffler, it has to be made of stainless steel. Not too loud but still makes the sound that everyone loves to hear. ------------- 70 Javelin SST, second owner, purchased 1972 |
Posted By: ccowx
Date Posted: Jan/14/2019 at 9:11am
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Crossover pipe? I did not think that a 70 Javelin had one of those from the factory? Thanks! Chris
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Posted By: White70JavelinSST
Date Posted: Jan/14/2019 at 9:34am
Sorry, bad use of terminology. Back in the day we used to call the pipe that joined the two sides together before the muffler for single exhaust a cross over pipe. ------------- 70 Javelin SST, second owner, purchased 1972 |
Posted By: Trader
Date Posted: Jan/14/2019 at 12:00pm
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And way back when my Grandfather and Father owned the garage it was called a "Y" pipe. |
Posted By: White70JavelinSST
Date Posted: Jan/14/2019 at 12:18pm
Yup, Y pipe was another term used, crossover might have been very local . ------------- 70 Javelin SST, second owner, purchased 1972 |
Posted By: Jmerican
Date Posted: Jan/14/2019 at 1:29pm
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I’ve dodged this one for a while. Can I start with questions? What is your objective? Stock? Stockish? Single or duals? Mellow to mild performance? Just the muffler? Are you looking to improve the performance? Change the sound? Then the recommending and experience can commence. I haven’t read the whole thread, but I’m seeing a lack of questions.
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Posted By: Jmerican
Date Posted: Jan/14/2019 at 1:37pm
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Fsj’s suggestion on the Walker book would be a great start. I’m sure we could help come up with something interesting. Describe the system now, and maybe post a pic, and rough dimensions. Walker could provide stock type resonator equipped muffler, in a good flowing design. There are other, more trick ways of doing mellow ambassador worthy cruising, commute, neighborhood friendly things too.
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Posted By: FSJunkie
Date Posted: Jan/14/2019 at 2:15pm
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Walker Quiet Flow stainless mufflers are really nice. They are 100% OE replacement, very quiet, and last practically forever. Turbo mufflers, made by Walker, Thrush, or Dynomax, are pretty nice too. They're usually not stainless but still last a long time. They are quiet but what sound they make has a nice tone. They do not drone at all. I generally find a single large case volume turbo muffler with either a converter or a resonator ahead of it to be acceptable. Put an electric cutout in after the resonator if you want to blat from time to time. ------------- 1955 Packard 1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
Posted By: FSJunkie
Date Posted: Jan/15/2019 at 12:30am
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Actually I just discovered Thrush makes a muffler called the Thrush Hush. It looks like a really cool option. It appears to be basically a Thrush turbo with some fiberglass matting inside, which is exactly what stock OE mufflers are. Will likely be my next muffler. ------------- 1955 Packard 1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
Posted By: amx007
Date Posted: Jan/15/2019 at 1:01pm
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that’s what I have on my 69 and it just right it has a little rumble makes my 290 sound tough Mean
------------- dream red white and blue 1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
Posted By: Ambassador66
Date Posted: Jan/16/2019 at 7:31pm
As soon as I'm able to post pics I'll dump a ton. In the mean time it's stock, stock, stock. Just a huge hole in the middle of it. I can see separate lines coming back from each side of he engine and then make a y'ish shape that then goes up and a quick 90 over the diff. It then goes into the muffler with the extra output on the left and exits on the right. It exits to a single side on the passengers side of the car. I've done single to doubles and doubles to singles on bikes, just don't know what I don't know with the car. DIY is the name of the game. If I could go to a double it wouldn't hurt my feelings. |
Posted By: Phrogbubba
Date Posted: Jan/23/2019 at 4:46am
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I crank Zepplin until it overcomes my Flowmaster 40's. If it's too loud . . . (?) you're too . . . (?)! ------------- "When a man's words are not better than the silence, he should remain silent." Qwi Chang Cain |
Posted By: one bad rambler
Date Posted: Jan/23/2019 at 9:14pm
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I run 3 inch straight though (Perforated not louvered) glass packs that exit in front of the rear wheels...I turn my 8 track(Don`t have a radio) on when i start the car but can`t hear it while i`m driving..... The Burnout is not in front of my house..it`s in an industrial park.. https://www.youtube.com/watch?v=jIEdV6vPswg" rel="nofollow - https://www.youtube.com/watch?v=jIEdV6vPswg -------------  68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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