Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 02-07-2003, 11:30 PM
440barracuda 440barracuda is offline
Inactive User
 
Join Date: Nov 2002
Location: Flower Mound Tx
Age: 36
Posts: 251
Default Exhaust Size help

Ok, the deal is, that i just dropped in a 440. and i just bought and had installed a 2 1/4 inch exhasust system, with 2 chamber flowmasters. Knowing this isnt big enough, I am dispointed that i bought this, (not knowing i would be dropping a 440 in.)
ANyways, what size and type of exuast system would you use?
here are the engine specs.

1968 440 block, .030 over, balanced
906 heads, 2.14, 1.81 valves 3 angle valve job, new springs
Mopar 9:1 pistons
Steel crank
Performer RPM intake
Holly 780 carb
3/8's fuel line
Carter Fuel pump
Double roller timing set
Purple shaft Hemi Grind .474/.474
WIndage tray
Schumacher Tri Y ceramic coated headers
stock pan
727 trans w/B&M shift kit and shifter and deep pan
K&N air filter
Aluminum Water pump and Housing
8 3/4 rear with surgrip and 3.55 gearing

If you need to know anything else in order to come up with a couple exhuast system ideas let me know, I cant think of anymore things off of the top of my head. THanks alot.
Reply With Quote
  #2  
Old 02-08-2003, 12:22 AM
Mills Mills is offline
Inactive User
 
Join Date: Aug 2001
Location: Calgary, AB, Can
Age: 44
Posts: 258
Default

While your 2-1/4" isn't that bad, a 2-1/2" would be better, and a 440 with build like that will like a 3" the best.

Mills
Reply With Quote
  #3  
Old 02-08-2003, 12:24 AM
plydus340's Avatar
plydus340 plydus340 is offline
Inactive User
 
Join Date: Oct 2002
Location: marlow oklahoma
Age: 61
Posts: 229
Default

Im not a machanic but i think that you need some backpressure. most people think they need a great big exhaust, but I would rather have a 2 1/4 than a 3. I think a 2 1/2 would be ideal for you set up.
By the by, do you love your tri ys? Thats the plan with my 440 a body.
Reply With Quote
  #4  
Old 02-08-2003, 12:26 AM
Mopar_Maniac Mopar_Maniac is offline
Senior Member
 
Join Date: Mar 2000
Location: Minnesota
Posts: 452
Default

440barracuda...

Unless you have a lot of "extra" money laying around needing to be spent I wouldn't bother with installing another new exhaust system at this time.

You have what sounds like a fairly mild 440 street package. When and if you really go nuts with compression, cam, etc. then you might want to bump up to a 3" system.

If memory serves...Chrysler used a 2.25" system on the 440's and even most, it not all the street Hemi engines.

It's your cash, and your car...but I wouldn't waste MY money to change out a new 2.25" system.

Good luck,
Mopar_Maniac
Reply With Quote
  #5  
Old 02-08-2003, 12:31 AM
Doug Wilson Doug Wilson is offline
Inactive User
 
Join Date: Aug 2001
Location: Sheridan, Oregon
Age: 79
Posts: 2,510
Default

OK, I think it's fine.... but...

1) Is this a street car, street/strip, strip only, 4x4 mudder, tow rig, what?

2) What is the inside diameter of your headers?

If it's anything but a pure race car, you should be good to go with the setup you have. Making the pipes and mufflers bigger will mostly make the noise louder, and if you take any road trips, you will quickly get sick of it.

By the way, what vehicle are we talking about?
Reply With Quote
  #6  
Old 02-08-2003, 12:45 AM
440barracuda 440barracuda is offline
Inactive User
 
Join Date: Nov 2002
Location: Flower Mound Tx
Age: 36
Posts: 251
Default

Well, the car is going to see some strip time, when i feel like having alittle fun. the motor could also be seeing some upgrades later on also, not sure yet, but it very well could be.

I like the Tri-Ys. they are great around the steering . the motor instal took 30-40 tops. THe car is a 1968 barracuda
Reply With Quote
  #7  
Old 02-08-2003, 01:07 AM
ehostler's Avatar
ehostler ehostler is offline
Registered User
 
Join Date: Jan 2000
Location: Annandale, VA
Age: 57
Posts: 15,212
Default

You didn't mention if you have a crossover pipe or not. An H-pipe will make the 2¼" pipes behave like 2½" pipes and a Mr. Gas X-pipe will make the pipes behave like 2¾" pipes.

If your pipes aren't mandrel bent, I would recommend upgrading to 2½" pipes with an X-pipe. If they are mandrel bent, then just add the X-p
Reply With Quote
  #8  
Old 02-08-2003, 10:17 PM
440barracuda 440barracuda is offline
Inactive User
 
Join Date: Nov 2002
Location: Flower Mound Tx
Age: 36
Posts: 251
Default

Well, the problem now, is that the exuast will not go to the headers, becuase, the headers are shorter than the ones i had on it before.
So, I am going to go with some pipes that will come out before the rear wheels, the tips will be stock 2002 viper tips.
I just need to know what exhuast I should run. Any one here know what the loudest pipe/muffler combo are? I really want this car to be noticeable, without seeing the car.
I want to wake up the neighborhood when i start the car up in the morning haha. any have any suggestions?
Reply With Quote
  #9  
Old 02-08-2003, 11:41 PM
MY340's Avatar
MY340 MY340 is offline
Inactive User
 
Join Date: Aug 2001
Location: washington, missouri
Posts: 437
Default

If your 2.25 exhaust system is crimp bent it may be rather restrictive for your engine combo. 2.5" mandrel bent or 3" crimp bent would probably be better. When I had Flowmaster 2 chambers on my car with tailpipes I didn't like the metallic or tinny sound they gave the exhaust tone at idle. Plus they give off so much resonance at cruise rpm. I swapped to 2.5" Dynomax Ultraflows. To me they have a better exhaust tone and supposedly flow twice the scfm of the Flowmasters. I changed my system several times before I was satisfied.
Reply With Quote
  #10  
Old 02-09-2003, 01:02 AM
Doug Wilson Doug Wilson is offline
Inactive User
 
Join Date: Aug 2001
Location: Sheridan, Oregon
Age: 79
Posts: 2,510
Default

......... and us old farts wonder why we can't hear anymore. Guess maaybe we used to be young and noisy..... loud pipes, loud stereos and REALLY loud guns. Earplugs??? I'm a MAN - I don't need no stinking ear plugs.

Oh. well.
Reply With Quote
  #11  
Old 02-09-2003, 01:13 AM
dwc43's Avatar
dwc43 dwc43 is offline
Banned
 
Join Date: Sep 2002
Location: Shelbyville,Tn.
Age: 54
Posts: 23,987
Default

[QUOTE]Originally posted by 440barracuda
Well, the problem now, is that the exuast will not go to the headers, becuase, the headers are shorter than the ones i had on it before.
So, I am going to go with some pipes that will come out before the rear wheels, the tips will be stock 2002 viper tips.
I just need to know what exhuast I should run. Any one here know what the loudest pipe/muffler combo are? I really want this car to be noticeable, without seeing the car.
I want to wake up the neighborhood when i start the car up in the morning haha. any have any suggestions?
[/QUOT


Since you are exiting before the wheels, put 2 1/2 with an H pipe and two chamber flow masters. That's almost there race muffler. Pretty loud. Wont have room for an X pipe before the wheels I dont think.
Reply With Quote
  #12  
Old 02-10-2003, 02:49 AM
451Mopar 451Mopar is offline
Inactive User
 
Join Date: Sep 2000
Location: Aurora, Colorado
Age: 59
Posts: 1,831
Default

If you want a loud exhaust system, I have a 3.5" system with Dynomax 6" welded Race Mufflers. I wouldn't recommend it for the street unless you like setting off car alarms at idle.

I would use a mandrel bent 2.5" system with the large case "Hemi" dynomax superturbo mufflers.

A 3" system would be louder, but more expensive and harder to fit under the car.
Reply With Quote
  #13  
Old 02-10-2003, 03:08 AM
tbirdkiri tbirdkiri is offline
Inactive User
 
Join Date: Feb 2002
Location: Ripon, Ca
Posts: 56
Default

2.5' Mandrel with an X-pipe. Look into Spintech mufflers, they are out of Southern California, and they seem to have a solution for just about everyone

http://www.spintechmufflers.com/spin...ntechindex.asp
Reply With Quote
  #14  
Old 02-10-2003, 01:05 PM
CrazyMoparGirl's Avatar
CrazyMoparGirl CrazyMoparGirl is offline
Inactive User
 
Join Date: Jul 2001
Location: Florida
Age: 47
Posts: 352
Default

We got in trouble with our 3" non-mandrel bent 2 chamber flowmasters that exited out the back for excessive noise. We put the old 2 1/2 non-mandrel bent super turbo mufflers that turn down right before the rear axle. The car feels much slower with the 2 1/2 on it. BTW it is a 70 Challenger with a 451.
Reply With Quote
  #15  
Old 02-10-2003, 10:16 PM
70Barracuda's Avatar
70Barracuda 70Barracuda is offline
Inactive User
 
Join Date: Jan 2001
Location: Beaverton, Oregon US
Age: 62
Posts: 625
Default

Dynomax makes a 2 1/2 that enters and exists on the same end.
You can do it AAR style. I did not care for it cuz the exhuast blasted the cars next to me in traffic and I heard the exhuast in mono while driving.
Reply With Quote
  #16  
Old 02-10-2003, 10:17 PM
440barracuda 440barracuda is offline
Inactive User
 
Join Date: Nov 2002
Location: Flower Mound Tx
Age: 36
Posts: 251
Default

Well around here, were do not have many exhuast people that do mandrel bending, so i am thinking the normal bent 3 inch, with the 2 chambers, becuse then all i would only need to buy the pipes, and not have ot buy a whole new set when the mufflers were only used 5 times, for less than 10 minutes each time, and were not abused by the 318. I am thinking about exiting before the rear wheels, are there problems with this? I have a pic of a car around here, alot like mine, but jus has a different paint color, and a 318 that did this, and also a barracuda on my web site
www.mikesmusclecars.iwarp.com that has the pipes I might want to run. THanks for the help.
Reply With Quote
  #17  
Old 02-10-2003, 11:31 PM
Doug Wilson Doug Wilson is offline
Inactive User
 
Join Date: Aug 2001
Location: Sheridan, Oregon
Age: 79
Posts: 2,510
Default

Doing this will gain no performance. It is possible - even likely - that this will cost you some low-end.

I am sure, however, that the noise will impress your buddies, and you can always tell them that it shaved 2/10,000ths off your time.
Reply With Quote
  #18  
Old 02-10-2003, 11:52 PM
Slant Cecil Slant Cecil is offline
Inactive User
 
Join Date: Oct 2002
Location: Florida, land of misery
Posts: 373
Default

The non-mandrel bent 3" will be as restrictive as 2 1/2" mandrel bent. The 3" pipe is harder to bend, has more metal to shrink and expand. The 'kinks' in a regular bend 3" are more exaggerated the a 2 1/2" regular bend. So don't compare a 2 1/2" bend and think the 3" will look the same only 1/2" bigger. Plus as said, 3" is harder to fit. It may pay to find a shop that can do mandrel bending, whether 2 1/2" or 3" is used.

Cecil
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
best exhaust size fat 360 Jeep Chat (Wrangler, Cherokee, etc...) 5 04-11-2010 10:23 PM
exhaust size Xterminator Vintage MOPAR chat 1 03-20-2006 02:46 AM
What size exhaust 440dart_72 Performance Talk 20 09-20-2003 11:23 PM
exhaust size Robert Cain Performance Talk 4 03-03-2003 05:21 PM
Exhaust Size? Pepper Dakota Truck Forum 6 11-12-2001 10:58 AM




All times are GMT -4. The time now is 09:35 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .