 | | 
03-20-06, 09:51 PM
|
#1 (permalink)
| | Forum Regular
Join Date: Apr 2005 Location: Chandler, AZ
Posts: 117
| What's inside a resonator?
Has anyone opened up an exhaust resonator to
see what's inside?
I'm curious to know if it's an acoustically tuned
"Helmholtz" resonator, where it's the chamber
dimensions that do the magic, or if it's just an
absorber type of thing.
__________________
Mark Mir
'97 LX450 w factory lockers
| 
|  |
|
03-20-06, 10:13 PM
|
#2 (permalink)
| | Forum Lifer
Join Date: May 2005
Posts: 4,036
| Quote: |
Originally Posted by Bambusiero I'm curious to know if it's an acoustically tuned
"Helmholtz" resonator, where it's the chamber
dimensions that do the magic, or if it's just an
absorber type of thing. | I have no idea what you're talking about.
HTH  ,
Curtis | |
| | |
03-20-06, 10:19 PM
|
#3 (permalink)
| | Forum Lifer
Join Date: Sep 2004
Posts: 2,768
| look right up the tail pipe and you'll find out........which means it's absorber, usally can tell by the holes. Works like a glass pack. | |
| | |
03-20-06, 10:38 PM
| | Hawke |
This message has been deleted by Hawke.
| |
03-21-06, 02:04 AM
|
#4 (permalink)
| | 250+ Club
Join Date: Oct 2005 Location: Darwin, Northern Territory, Australia
Posts: 488
| make sure you stick your eye right on it while its running to.
Come on fellas PLEASE.
__________________
93 hzj80 Aussie spec cruiser with 9000 pound warn winch , old man emu suspension , engel fridge, ARB front & rear lockers,GME UHF 2 way and ARB compressor.
| |
| | |
03-21-06, 04:51 AM
|
#5 (permalink)
| | Site Addict
Join Date: Nov 2004 Location: Queensland
Posts: 1,066
| I've never even looked outside an exhaust resonator to see what's outside of one
__________________
'97 80
'97 LX 450
| |
| | |
03-21-06, 05:03 AM
|
#6 (permalink)
| | Site Addict
Join Date: Feb 2006 Location: Maryborough, QLD, Aust.
Posts: 1,023
| Three inch mandrel bent turbo exhausts don't have resonators. 
__________________
90 HZJ80 GXL, DTS turbo, 285/75R16 MTR's, 4" OME, Safari snorkel, ARB airlocker, ARB bullbar, ARB dual pivot rear bar, dual batts, etc.... SOLD
99 HZJ105R GXL standard for now.....
99 DR650SE
| |
| | |
03-21-06, 06:45 AM
|
#7 (permalink)
| | Site Addict
Join Date: Oct 2002
Posts: 1,921
| They are hollow chambers, oems tune them for specific applications. There are aftermarket units that probably work well for some applications, not so well for others.
res·o·na·tor ( P ) Pronunciation Key (rz-ntr)
n.
1. A resonating system.
2. A hollow chamber or cavity with dimensions chosen to permit internal resonant oscillation of electromagnetic or acoustical waves of specific frequencies.
3. A resonant circuit.
__________________
Brian
Jowett Engineering
Western Massachusetts
08 Tundra Double Cab 5.7 Supercharged AWD
93 FZJ80, locked, 4.6L, 6 speed, Orion FORSALE
04 VW Touareg V8 w/ locker (hers)
80 FJ40 , 83k, PS and AC
05 Yamaha RS Rage Snowmobile
06 Suzuki King Quad
93 VW Corrado Syncro AWD 3.0L
51 Jowett Jupiter Roadster
| |
| | |
03-21-06, 07:32 AM
|
#8 (permalink)
| | Forum Regular
Join Date: Sep 2005 Location: Highland, UT
Posts: 182
| Quote: |
Originally Posted by bjowett They are hollow chambers, oems tune them for specific applications. There are aftermarket units that probably work well for some applications, not so well for others.
res·o·na·tor ( P ) Pronunciation Key (rz-ntr)
n.
1. A resonating system.
2. A hollow chamber or cavity with dimensions chosen to permit internal resonant oscillation of electromagnetic or acoustical waves of specific frequencies.
3. A resonant circuit. | Oh, now I get it 
Reduces noise.
__________________
James Trinnaman
'95 FZJ80
SOLD: '97 LX450, '84 FJ60(x2), '76 FJ40
If you want to get there, drive a J**p. If you want to get back, drive a Landcruiser.
| |
| | |
03-21-06, 08:51 AM
|
#9 (permalink)
| | still solving problems...
Join Date: Oct 2003 Location: uhhhh...duh...Northern CA
Posts: 5,421
| dunno what the OEM one has -- I didn't bother picking it up to look inside.
the aftermarket resonator I have was a solid surface (i.e. no holes) with smallish bumps in some sort of pattern on the inside. I took a look at it before the install.
__________________ a couple pairs of pink panties...
Another convert to the Church of Latter Day Swank, a sub-cult of Shahrislam
"...Opportunity doesn't knock, you have to kick the fuckin door in and drag the bitch out screamin." -- Ullr
"I have more respect for people who change their views after acquiring new information than for those who cling to views they held thirty years ago. The world changes. Ideologues and zealots don't." - Michael Crichton | |
| | |
03-21-06, 08:53 AM
|
#10 (permalink)
| | Site Addict
Join Date: Oct 2002
Posts: 1,921
| "Oh, now I get it"
All you'll get is the mud salute
__________________
Brian
Jowett Engineering
Western Massachusetts
08 Tundra Double Cab 5.7 Supercharged AWD
93 FZJ80, locked, 4.6L, 6 speed, Orion FORSALE
04 VW Touareg V8 w/ locker (hers)
80 FJ40 , 83k, PS and AC
05 Yamaha RS Rage Snowmobile
06 Suzuki King Quad
93 VW Corrado Syncro AWD 3.0L
51 Jowett Jupiter Roadster
| |
| | |
03-21-06, 11:26 AM
|
#11 (permalink)
| | Forum Lifer
Join Date: Sep 2004
Posts: 2,768
| Quote: |
Originally Posted by Hawke What does that mean? | This........ Just recently I had to tie up my tail pipe with zip ties. Happened to look up into the resonator. From what I recall of taking the resonator apart off my celica it did have some material in it. It had the same pattern of holes inside and would just guess that probably the 80 was the same.
Last edited by Bear80; 06-14-06 at 10:28 AM.
| |
| | |
03-21-06, 12:01 PM
|
#12 (permalink)
| | tlcwagons.org
Join Date: Nov 2003
Posts: 3,875
| If anyone has a stock resonator they are not using, PM me. I know someone that needs it. Thanks
__________________ I love cachapas! my wip I drink your milkshake! | |
| | |
03-21-06, 01:49 PM
|
#13 (permalink)
| | The quick brown fox .....
Join Date: Mar 2003 Location: Somewhere in the foothills...
Posts: 11,902
| Quote: |
Originally Posted by Bambusiero I'm curious to know if it's an acoustically tuned
"Helmholtz" resonator ... | I cannot remember where, but I read that it is in fact a Helmholtz resonator.
-B-
__________________
97 FZJ80 - Locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, Warn M12000, OBA, Yaesu 7800, Outback drawers + other stuff. Transformation complete.
Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself.
| |
| | |
03-21-06, 02:09 PM
|
#14 (permalink)
| | Forum Regular
Join Date: Apr 2005 Location: Chandler, AZ
Posts: 117
| For some reason that picture makes me nervous.
I'm not even really sure why...
__________________
Mark Mir
'97 LX450 w factory lockers
| |
| | |
03-21-06, 02:48 PM
|
#15 (permalink)
| | The quick brown fox .....
Join Date: Mar 2003 Location: Somewhere in the foothills...
Posts: 11,902
| You mean my avatar?
-B-
__________________
97 FZJ80 - Locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, Warn M12000, OBA, Yaesu 7800, Outback drawers + other stuff. Transformation complete.
Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself.
| |
| | |
03-21-06, 03:33 PM
|
#16 (permalink)
| | Forum Regular
Join Date: Apr 2005 Location: Chandler, AZ
Posts: 117
| Quote:
Beowulf Quote:
I cannot remember where, but I read that it is in fact a Helmholtz resonator.
| Ah, sooo, velly impotant! Quote:
bjowett (paraphrased) Quote:
They are hollow chambers, oems tune them for specific applications. There are aftermarket units that probably work well for some applications, not so well for others.
res·o·na·tor ( P ) Pronunciation Key (rz-ntr)
n.
2. A hollow chamber or cavity with dimensions chosen to permit internal resonant oscillation of acoustical waves of specific frequencies. | Exactly, thank you, bjowett, for defining it for those that haven't heard of such nerdly stuff. Think of blowing on a Coke bottle  (oops, sorry guys) beer bottle, and making it whistle. It's a resonant cavity at a certain frequency (tone). Sound waves travel down the tube, reflect off the far end, and travel back to the opening. Set up the length a certain way and you can either reinforce the source at the opening, or partly cancel it. Speaker makers use the concept all the time for reinforcement. (Bose Wave radio)
Apparently, mufflers do a pretty good job across the frequency range, but some particular tone gets through. So, they put in a special little tuned thingy to cancel out that particular tone. The resonator.
Hey, look at the size of those things. No way a little "glass pack" that size could do much. The BIG ones don't do much!
SOME people cut the thing off and get annoying droning or whistling in a certain RPM band.
Or, some OTHER people put in Quote: |
Three inch mandrel bent turbo exhausts don't have resonators. | and they get whatever they get,    who knows? Quote:
NorCalDoug Quote:
dunno what the OEM one has -- I didn't bother picking it up to look inside.
the aftermarket resonator I have was a solid surface (i.e. no holes) with smallish bumps in some sort of pattern on the inside. I took a look at it before the install.
| So here's the thing. I think it would be just lucky to pick an aftermarket resonator and have it work. It has to be tuned to your engine & exhaust system design.
Change mufflers or cats very much, and you might change the sonic character of the whole system.
How many muffler shop guys do you think are up on this stuff?
BTW, there's another resonant damper (mechanical) built into the resonator mount. It looks like a rubber knob with no apperant purpose. I think the factory engineers put it there for some good reason.
__________________
Mark Mir
'97 LX450 w factory lockers
| |
| | |
03-21-06, 06:15 PM
|
#17 (permalink)
| | Sir Richard Cranium esq.
Join Date: Feb 2005 Location: On the east side of a city in the west
Posts: 2,666
| Probably some family of bugs or something livin in mine since I cut it off and tossed it in the bushes.
2-1/2 pipe, 40 series Flowmaster and very hi flowing cats. Everything tucked up and outta the way, sounds like the James Earl Jones of ricers. | |
| | |
03-21-06, 10:13 PM
|
#18 (permalink)
| | Forum Regular
Join Date: Apr 2005 Location: Chandler, AZ
Posts: 117
| Hey Baggins,
Got any photos of your rig's "Everything tucked up and outta the way" exhaust routing, under-the-frame pipe, etc.? I'm pondering such things right now.
__________________
Mark Mir
'97 LX450 w factory lockers
| |
| | |
03-22-06, 05:15 AM
|
#19 (permalink)
| | Sir Richard Cranium esq.
Join Date: Feb 2005 Location: On the east side of a city in the west
Posts: 2,666
| Quote: |
Originally Posted by Bambusiero Hey Baggins,
Got any photos of your rig's "Everything tucked up and outta the way" exhaust routing, under-the-frame pipe, etc.? I'm pondering such things right now. |
I'll snap a few pics this afternoon. I will probably go to PHX next month for the CSC meeting if you want to get an up close look (I'm in Tucson) 
Last edited by MaddBaggins; 03-22-06 at 05:23 AM.
| |
| | |
03-22-06, 06:36 AM
|
#20 (permalink)
| | 250+ Club
Join Date: Jun 2005 Location: Arizona
Posts: 771
| Quote: |
Originally Posted by Bambusiero SOME people cut the thing off and get annoying droning or whistling in a certain RPM band. | Yep. Got the whistle going on wih the exhaust coming through the rear bumper.
__________________
Rob G
1983 FJ60 1995 FZJ80 2000 UZJ100
AZ
| |
| | | |
| Thread Tools | | | | Display Modes |  Linear Mode |
Posting Rules
| You may not post new threads You may not post replies You may not post attachments You may not edit your posts
HTML code is Off
| | |
|  | |
CJF
FirstToy
