| [GMCnet] Re: Quiet Exhaust Question? [message #368560 is a reply to message #368558] |
Tue, 25 January 2022 10:23   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
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Senior Member |
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There is a reason why on a RV we prefer to exit to the side and down.
When towing a car, it is preferable not to have the Hot air hitting
directly onto them. Also less chance of bending the pipe tip. If you use a
DB meter, the noise outside is the same if the pipe exits to the rear or
side. Just sound different inside.
On Tue, Jan 25, 2022 at 7:22 AM James Hupy wrote:
> GM experimented with no mufflers, by denting the exhaust pipe as well as
> the tailpipes. It was good when the cars were new, but the aftermarket
> exhaust providers raised "HOLY NED" with them because they had to provide
> similar exhaust systems. What usually happened was that the OEM stuff got
> replaced from manifold flanges to end of tailpipe with conventional
> systems. Customers were none to happy about the bills for that. GM changed
> back in a couple of years. Then came "catastrophic convertes" resonators,
> etc.
> Jim Hupy
> Salem, Oregon
>
> On Tue, Jan 25, 2022, 7:13 AM Keith V wrote:
>
>> I fixed the rap by running the exhaust straight out the back rather than
>> pointed out the pass side. I barely hear it at all now 🙂
>> ________________________________
>> From: Terry via Gmclist
>> Sent: Sunday, January 23, 2022 4:51 PM
>> To: gmclist@list.gmcnet.org
>> Cc: Terry
>> Subject: [GMCnet] Re: Quiet Exhaust Question?
>>
>> Mine is quiet with 2 mufflers up front and a long pipe to the right rear
>> corner. Pipe is 2.5 inch diameter. If I ever woke anybody up in a
> campground
>> they must have been sleeping in the road. Maybe the insides of one or
> both
>> of your mufflers has corroded away and is not cancelling the sound wave.
>> Headers up front are definitely louder than cast iron manifolds and I
> also
>> have those courtesy of the P.O.. I also have the fender liners installed.
>> Sitting in the driver's seat I can barely hear the engine running. Engine
>> tuning can make a big difference in the amount of sound emitted from
>> headers, but usually will be accompanied by loss of normal power output
>> and poor fuel economy. If it runs well and smooth I would check/replace
> the
>> mufflers first,especially since I have the equipment to tackle that job.
> A
>> resonator is just another muffler and will quiet it more (and eliminate
>> exhaust "crack") but also may cost just as much to procure and get
>> installed as replacing the mufflers. Depends on where and how you shop.
>> --
>> Terry Kelpien
>>
>> ASE Master Technician
>>
>> 73 Glacier 260
>>
>> Smithfield, Va.
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--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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