exhaust for 2.2

MarkRHayes · 03-31-2006

Putting a 2.2 liter engine in my 72 opel gt. Anyone got any specifics as to the best exhuast to use for performance? Why did the original exhaust have two mufflers? Do i still need to go with two mufflers?

WannaBOpelOwner · 03-31-2006

i do belive the orignal 2.2 was just a single pipe. i have a 98 sunfire with a 2.2 and it just has one but i think it matters what it came out of not the engine itself dont hold me to it....

baz · 03-31-2006

Originally Posted by MarkRHayes

Putting a 2.2 liter engine in my 72 opel gt. Anyone got any specifics as to the best exhuast to use for performance? Why did the original exhaust have two mufflers? Do i still need to go with two mufflers?

the 2 boxes do different jobs 1 is to kill high frequency noise the other for low frequency noise

asdasc · 03-31-2006

Originally Posted by baz

the 2 boxes do different jobs 1 is to kill high frequency noise the other for low frequency noise

Hi Baz, Interesting, this is the first time I have heard that. I am sure you are right. That leads me to finally ask a question that has been bouncing around in my head. What is the difference between a muffler and a resonator? Which was which in the original, stock GT set up?

baz · 03-31-2006

muffler is the low frequency killer and resonator the high frequency if i remember right

RallyBob · 03-31-2006

Originally Posted by asdasc

What is the difference between a muffler and a resonator? Which was which in the original, stock GT set up?

The forward cannister in the GT is the actual muffler. The rear section with the exhaust tips is the resonator. While the muffler has actual sound-attenuation capabilities, the resonator is simply there to reduce the resonance that occurs with a 4-cylinder engine. At certain rpms it can really pound the eardrums, even though it's not technically that loud on a DB meter. The GT resonator is in fact a hollow shell, there are no baffles or sound-absorbing materials inside it.

Bob

asdasc · 03-31-2006

Thanks Bob and Baz, so in reality, the resonator shouldn't restrict power at all, right? I need to 'fix' my exhaust, as the neighbors think it is too loud. I like it.

I have the stock head pipe going back to a 5" round muffler and then a standard thin pipe back to the single chrome tip.

I was planning to use 2" pipe from the Y to the straight flow (Flowmaster type) muffler and then 2.5" over the rear axle to a U with resonator tips. I am not sure I like the resonator tips appearance. Would it hurt performance (Flow) to use a stock type resonator in the back with that set up?

Thanks,

baz · 03-31-2006

there is a horseshoe shaped pipe
that joins the 2 tip pipes ,that is full of small holes and for a full on engine can be a small restriction
i was chatting in a thread a week or so ago about how to rebuild the inside and use loose rockwool in it to help with sound and not harm flow by using expanded steel sheet to remake the pipe and add a feeder pipe from the inlet with a hole into the horseshoe (real easy to see how it would work if you open a stock back box )

you then get the gasses out as quick as it can and the rockwool helps take the edge off the noise for the neighbours

tekenaar · 03-31-2006

Originally Posted by RallyBob

The forward cannister in the GT is the actual muffler. The rear section with the exhaust tips is the resonator. While the muffler has actual sound-attenuation capabilities, the resonator is simply there to reduce the resonance that occurs with a 4-cylinder engine. At certain rpms it can really pound the eardrums, even though it's not technically that loud on a DB meter. The GT resonator is in fact a hollow shell, there are no baffles or sound-absorbing materials inside it.

Bob

Can anyone say . . . expansion chamber?!

blauwmarc · 03-31-2006

I have the luck to know somebody who made me a stainless(?) steel exhaust for my 2.2. It sounds very good, it has a deep sound but not overtaken. I should add some pics of the connections between the parts of this exhaust, it's so easy and wellthought. No more pipe pressed into the other one, no more problems taking it apart (rusted or jammed). Remind me to show a pic, because I have the car not at home and I don't know when my next ride with this GT will be. Then I'll shoot the pics.

03-31-2006	#1 (permalink)
MarkRHayes Army Opeler Join Date: Mar 2005 Location: Jonesboro, GA Posts: 89	Unanswered: exhaust for 2.2 Putting a 2.2 liter engine in my 72 opel gt. Anyone got any specifics as to the best exhuast to use for performance? Why did the original exhaust have two mufflers? Do i still need to go with two mufflers?

03-31-2006	#2 (permalink)
WannaBOpelOwner The Great Opel Search Join Date: Aug 2004 Location: Casey, Illinois Posts: 411	i do belive the orignal 2.2 was just a single pipe. i have a 98 sunfire with a 2.2 and it just has one but i think it matters what it came out of not the engine itself dont hold me to it.... __________________ 1998 Sunfire "The Great Opel Search Continues" © of Skyler Shelton "The dictionary is the only place where success comes before work" Mark Twain "Tobmstones Dont Talk Back" Smoke Tires, Not Drugs... http://sportcar.net

03-31-2006	#5 (permalink)
baz opel free after 26 years Join Date: Jun 2002 Location: sunderland england Posts: 4,939 Real Name: barry williams Provided Answers: 4	muffler is the low frequency killer and resonator the high frequency if i remember right __________________ Copyright © 2003-2009 barry williams All Rights Reserved save praying to God for sunday today we pray to Nike and run like hell

03-31-2006	#7 (permalink)
asdasc Senior Contributor Join Date: Oct 2005 Location: Mt. Clemens, Michigan Posts: 888	Thanks Bob and Baz, so in reality, the resonator shouldn't restrict power at all, right? I need to 'fix' my exhaust, as the neighbors think it is too loud. I like it. I have the stock head pipe going back to a 5" round muffler and then a standard thin pipe back to the single chrome tip. I was planning to use 2" pipe from the Y to the straight flow (Flowmaster type) muffler and then 2.5" over the rear axle to a U with resonator tips. I am not sure I like the resonator tips appearance. Would it hurt performance (Flow) to use a stock type resonator in the back with that set up? Thanks, __________________ Steve "ever notice you are never done tinkering with the GT?" Never mind, I am WAAAY beyond tinkering now...[/SIGPIC]

03-31-2006	#8 (permalink)
baz opel free after 26 years Join Date: Jun 2002 Location: sunderland england Posts: 4,939 Real Name: barry williams Provided Answers: 4	there is a horseshoe shaped pipe that joins the 2 tip pipes ,that is full of small holes and for a full on engine can be a small restriction i was chatting in a thread a week or so ago about how to rebuild the inside and use loose rockwool in it to help with sound and not harm flow by using expanded steel sheet to remake the pipe and add a feeder pipe from the inlet with a hole into the horseshoe (real easy to see how it would work if you open a stock back box ) you then get the gasses out as quick as it can and the rockwool helps take the edge off the noise for the neighbours __________________ Copyright © 2003-2009 barry williams All Rights Reserved save praying to God for sunday today we pray to Nike and run like hell

03-31-2006	#10 (permalink)
blauwmarc GT is my middle name Join Date: Jan 2006 Location: netherlands Posts: 610	I have the luck to know somebody who made me a stainless(?) steel exhaust for my 2.2. It sounds very good, it has a deep sound but not overtaken. I should add some pics of the connections between the parts of this exhaust, it's so easy and wellthought. No more pipe pressed into the other one, no more problems taking it apart (rusted or jammed). Remind me to show a pic, because I have the car not at home and I don't know when my next ride with this GT will be. Then I'll shoot the pics.

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