SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
#16
|
||||
|
||||
Re: Resinator
Quote:
Its your tranny. I'm kidding!
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#17
|
||||
|
||||
Re: Resinator
Quote:
I think you are confusing the automotive resonator with an expansion chamber found on two strokes. Last edited by Bonestock; 04-21-2010 at 09:34 PM. |
#18
|
||||
|
||||
Re: Resinator
Quote:
However, this being an SVX, with an engine that actually works like a pair of three cylinder engines sharing a common crankshaft, an X pipe or balancing is not necessary, or helpful. I have had about fourteen(?) custom exhausts on my Claret, always in search of "The Perfect Exhaust". and, as Harvey stated, its sure hard to better the exhaust over stock! I have removed the factory resonator and not noticed the differance, BUT several customers with multiple SVXi have, to the point that they insisted on the re-installation of a resonator. Who am I to argue with someone who only drives one or two SVXi... AND REALLY pays attention! John.
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link Last edited by svxfiles; 04-26-2010 at 05:37 PM. |
#19
|
|||
|
|||
Re: Resinator
Quote:
Your last statement is exactly right. The resonate chamber is doing the same sort of job, in reflecting the sound wave back to the cylinder. This bit gets a definite no. Quote:
The rear muffler is not as restrictive as you may think, judging from the quite exhaust note. It is quite, because all the sound energy has been used up in improving the negative pressure in the cylinder, the rest has got lost in the huge muffler. Harvey.
__________________
One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#20
|
||||
|
||||
Re: Resinator
Quote:
Everything depends on the energy produced as a result of the velocity and the number of packages of gas travelling down a conductor at a given point in time. Each moving package of gas creates a followng package of low pressure gas. Nothing is “reflected” back, everything is ongoing. There is a train which has innertia travelling down a line and power is available which can be utilised. Therefore the dependant factors within a four stroke engine constitute. --- engine speed; valve timing; number of cylinders feeding a given conductor; effective conductor cross section; resistance as a cosequence of shape or texture; when where and if individual outputs are combined; length of the conductor prior to any area providing substantial expansion; resistance from that point on. A chamber providing expansion prior to the muffler, provides the first step in an evolving process. The muffler system, muffles the impending sound vibrations before these enter the atmosphere by smoothing the high and low energy peaks available between pulses. A factor of time is involved in respect of each pulse of energy negotiating the muffler before exit, and the rate and speed is modified. Inevitably this must incur some resistance.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#21
|
|||
|
|||
Re: Resinator
Now that I can sink my teeth into.
|
#22
|
||||
|
||||
Re: Resinator
I am thinking I may have this done at some point. Probably couldn't hurt and I have never been completely happy with exhaust sound without the resonator. Has anyone used the one that Dayle is selling?
http://svx-motorsport-accessories.st...svxhiflre.html Oh and Trevor, I really respect your opinions, but I'm sorry I feel a bit lost every time I read one of your posts. Can you dumb it down for me a bit. Are you saying you agree that the SVX should have the resonator as a important part of the exhaust?
__________________
1992 LSL ebony pearl 170k - Thank you Ron Mummert Reading Box of Wine Car ----------------------------------- 1992 SVX LSL 5-Speed Sold at 180K 2019 1995 SVX Lsi Polo Sold at 118K 2007 |
#23
|
||||
|
||||
Re: Resinator
Quote:
__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#24
|
||||
|
||||
Re: Resinator
Restrictive? Wait, what?
And that one from Dayle looks nice. Nice price on it too
__________________
1992 Pearl White LS-L "Ruslana" #4946 - 180k on body, 95k on engine. Mods: ECU bead crush, 15 min mod, 20 min mod, drilled/slotted rotors & Axxis ceramic brakes, SS lines, 17" Evoke F1 wheels, XS-HF137 Sony Xplod speakers, 6000k HID's (lows & fogs), resistor mod, 1½" Sleek Spoiler mod, custom exhaust by svxfiles, '02 WRX aluminum racing radiator by svxfiles, Summit Racing 400# x 300# springs w/ Koni's by svxfiles, ClassGlass fiberglass hood /w scoop, Nevin's rear sway bar, '97 grille, phenolic spacers, custom LED interior lighting, custom paint. †"War doesn't determine who is right, only who is left"† Work to be done: Tinted windows, clear/LED tail lights, tailbar mod, "Power Mode" mod, Supertone horns, clear corners & headlight lenses, 2 pc splitters or custom bumper, Alcyone side skirts, TruSpeed Stage III SVX Intake, Hydra, 4.44 tranny swap, JDM auto folding side mirrors, engine rebuild, super charger, STi seats, bone leather interior /w SVX emblem, dash overhaul, SVX decals, paint (stock color). Total cost?: 22k At least it's going down..
|
#25
|
||||
|
||||
Re: Resinator
I believe Trevor is explaining in depth what I am talking about. The resonator in the exhaust is there for no reason other than altering the exhaust "note". Altering can be many things but usually the presence of a resonator in a cars exhaust QUIETS the overall db and or/helps eliminate certain frequencies the designers deem undesirable.
Now for a few of the other comments. One can not simply state (as fact no less) that you can not remove a part of the exhaust system w/o replacing it with a part of equal shape design or volume. That goes against every MFG, tuner, race team or whatever expertise you want to mention. Since our engines are basically air pumps, the more air you can get into it & out the more power it will make (with the appropriate amount of fuel obviously). Now I am not saying you can strap a sewer pipe to the intake and exhaust since the air must still travel thru the engines intake, combustion chamber and onto the exhaust ports etc. Its all about proportion on N/A engines. Sure you can shift the power about with different type of manifolds, headers, pipe diameter etc. It just depends on if the engine can benefit from the changes ie allows the exhaust gases to exit more efficiently. And increasing efficiency is called improving the engines VOLUMETRIC EFFICIENCY. I can not see how the addition of a resonator can have any effect on the engines performance providing it does not change flow +/- by any significant degree. I guess I should also note that when referring to exhaust back pressure its really a misnomer since we are really talking about maintaining exhaust velocity (to aid in expelling the burnt mixture as well as help draw the air and fuel into the combustion chamber ie scavenging like I mentioned before). I may only have one SVX but I have been in the automotive world on both personal and professional level for quite some time now. Oh and I guess I should throw in the obligatory hugs and kisses so no one takes offense. Last edited by Bonestock; 04-22-2010 at 12:26 PM. |
#26
|
|||
|
|||
Re: Resinator
Quote:
http://www.subaru-svx.net/forum/show...+system+design http://www.subaru-svx.net/forum/show...+system+design http://www.subaru-svx.net/forum/show...+system+design Harvey.
__________________
One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#27
|
||||
|
||||
Re: Resinator
Quote:
The resonator is there for a very definite reason, as was covered in my explanation covering the function of the exhaust system. The resonator is the first area providing substantial expansion and effectively ends the “tuned" portion of the system. “Therefore the dependant factors within a four stroke engine constitute. --- engine speed; valve timing; number of cylinders feeding a given conductor; effective conductor cross section; resistance as a consequence of shape or texture; when where and if individual outputs are combined; length of the conductor prior to any area providing substantial expansion; resistance from that point on.” A “tuned” exhAust system will certainly improve the volumetric efficiency of an engine. By this means, existing unused energy generated by a moving gas, is effectively harnessed.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#28
|
||||
|
||||
Re: Resinator
Quote:
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! Last edited by Trevor; 04-22-2010 at 05:21 PM. |
#29
|
||||
|
||||
Re: Resinator
Thats because they are acoustic resonators on our cars and not expansion chambers (and I cant be bothered to get into wave dynamics) like those fitted to 2 stroke motorcycle engines etc. The different sized resonators in the exhaust system are to change the exhaust note by canceling out certain frequencies (each size will have different effects) or to reduce the overall db .... nothing else. And before this turns into a pissing match, and it will, thats all I have to add to the subject. Hugs and kisses |
#30
|
||||
|
||||
Re: Resinator
Any section within an exhaust system whereby the cross section is increased for a short distance, must constitute and work as an expansion chamber, i.e. a place where the gas flow can and will expand, no matter what.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
|
|