Engine/Transmission (1998.5 - 2002) Making 24V quieter???

[yyzski]

Hi folks,



I realize that the following question may be considered blasphemy for some, but I would like to find ways of quieting down a (new to me) '02 24V Cummins.



I will be ordering the hood pad from the dealer on Monday.



What other things can I do to reduce the overall noise level of the truck?



Is there another muffler/resonator that can be installed in the exhaust without compromising flow or power too much? Different exhaust system entirely.



Dynamat or equivalent for the doors?



Any assistance would be greatly appreciated.



Thanks in advance!!!

 

[csevers]

Is the truck stock? If it is not you may have to undo what the previous owner has done to make it as quiet as you want. If it is stock then you have the right idea about dynamat on rear wall and doors, floor, fire wall anywhere you can get it. Some have put lead sheets on the rear wall to help kill sound. You might want to P M member Lsfarm he is the self proclaimed Noise Natzi he has done a lot of work with sound issues and he can probably give great advice.



Some 24v's are noisier than others



Craig

 

[yyzski]

Thanks!



Truck is a bone-stock '02 QC shortbox. 4x4, auto, 3. 54s, Sport. Only 25000 miles... .



If I still lived in the country, it wouldn't be that big a deal, but living in town it is L-O-U-D. Much louder than my old '90 12V.



Inside the cab isn't bad (especially at hiway cruise) but taking the edge of the outside noise would be a good thing for neighbourly relations (they already tolerate quite a bit).



edit - I found this thread after doing some searching...



https://www.turbodieselregister.com...3647&perpage=15&highlight=Lsfarm&pagenumber=1



Does anyone know if we get a TDR group discount from ATP? I like the looks of the 'Quiet Kit'.....

 

[rfcom]

To reduce noise in the cab, the single most effective thing you can do is use sound dampener on the rear wall. I put 2 layers of B-Quiet extreme on the back wall and a single layer on the floor and the sound level is waaaay down. Sounds like you already have a handle on reducing external noise.



Jim

 

[Lsfarm]

Noise reduction

Check out this thread,



https://www.turbodieselregister.com/forums/showthread.php?threadid=40821&highlight=Noise+Reduction



There is a lot of info available.



If you want to quiet the truck from the outside, the hood liner you mentioned is a start, next would be an oilpan blanket, then maybe a valve cover blanket. .



The biggest offender is the oil pan. Try this: take a piece of dense carpet padding and wrap a 8" x44" piece around the oil sump, and secure it with a couple of bungie cords. . You will be amazed at the difference. . see the above thread for what I did to dampen my oil pan



The ATP wrap products are very good quality, but very expensive. I personally prefered to experiment and learn about noise reduction on my truck.



PM me if you have any questions.



Greg L The Noise Nazi

 

[Duluth Diesel]

Your stock exhaust is the quietest, most restrictive system you can get. Stick with it and save some $$$. The vast majority of the noise on a 24 valve is engine noise, not exhaust noise. Genos has a turbo blanket that can help quiet down the turbo more beyond stock. Make sure your turbo silencer is in, you factory airbox is in, and the little plastic neck that goes between the airbox and the fender wall is in place.

 

[dsather]

Under carpet

To those who are putting dynamat or equivalent under the carpet. Are you removing the stock pad or just adding another layer inder it?



Dennis

 

[BarryG]

I just added another layer under it.

 

[Rescue]

Engine noise

Check out this site for engine noise blankets: www.atpwrap.com

 

[24Vpirate]

if its too LOUD then your too OLD

 

[Un-Hemi]

HUH? WHADJA SAY? I CAN'T HEAR YA OVER THE RACKET!!!!!

 

[Lsfarm]

Reality check

Yeah, I'm getting older, one day at a time,[ it's better than the alternative], and I can still hear!



Hearing damage is cummulative: that firecracker that went off next to your ear when you were ten years old caused damage that will come to haunt you when you are retired. Going to the range and shooting without hearing protection will guarantee hearing damge later. Check out the WW2, Korean and Vietnam veterans, how good is their hearing?? Constant loud background noise causes irreversable, cummulative hearing damage. This is NOT a joke!!



My truck had db readings in the mid 90's on the highway before I started my project to quiet it down. This is loud enough that I had a hard time having a conversation in the truck, and had to turn up the radio to distortion levels to hear it. Now I'm at 78-83 db depending on speed, wind and pavement conditions. The radio sounds much better!



Since I'm an airline pilot, and have to take a hearing test every six months as part of my FAA physical, this is an important issue for me. It should be an important issue for everyone.



But please don't try to limit your hearing damage!! I bought a bundle of stock in hearing-aid companies a few years back when the 'boom-box' generation came out! I'm counting on several decades of huge returns on this stock during my retirement



I like my truck to be loud from the outside when I want it to be, but all the time and everywhere? No thanks.



My point of view



Greg L. The Noise Nazi

 

[yyzski]

Originally posted by 24V pirate

if its too LOUD then your too OLD

Let's just call it 'a little too much of a good thing'... ... .

 

[cArNiVaLwOrKeR]

LOUDER

MAKE IT A 100 TIMES LOUDER!!!OR BUY A POWERJOKE OR A DURASLUG... OR @ LEAST A 03RAM...

 

[Hohn]

I like the sound of my truck. But you can have too mcuh of a good thing. I would LOVE to have the truck be loud with the good stuff (like exhaust tone) on the outside. But on the inside, I'd like to have it as quiet as a bank vault.



My ears are supe important to me because I am a musician. I wear earplugs when working near a running engine. Shoot, I wear them even just using power tools! Air compressor, you name it-- I wear the plugs.



Haven't had a regret yet about frequent earplug use.



jlh

 

[Cumminpwr11]

The best way to quiet it down is to WEAR EAR PLUGS



Or try something else that was said.



Personally, I don't trust a diesel I can't hearOo. Oo.

 

[Nigel]

YYZSKI:

I see you are in my part of the world and after reading this thread I am also interested in making the cab quieter. I just spent an hour with Fred Towler at www.wilrep.com in Mississauga. They have a product called Wildamp which appears to be quit similar to Dynamat at about a third of the price. I suggest you sit down with him because the web site doesn't have a whole lot of info on it.

 

[Cumminpwr11]

sound deadeners

There is a company that sell stuff really similar to dynamat extreme on ebay. He sell 100sq ft for $115. Thats enough for one and a half cabs. Double up where you need it.





Hope that helps



Chris



Nigel: Your first post!! Welcome to TDR. Happy Bombing

 

[DHawthorne]

Like Duluth Diesel said, make sure you airbox is set up as described. That is the most noisy thing on the truck being real close to the firewall. Use a good paper filter. I never knew how much noise came from that air box until I rode shotgun in my partners 2001.



My wife always complains about the noise on that side of the truck when were towing. So now, I put the snorkel back in, take the K&N out and put in the paper filter, makes her happy.



Otherwise, you just need some time with it as its not a gas motor.

You'll get use to it and won't hear it after a while.



Dave

 

[Crankshaft]

Someone said they added another short muffler closer to the engine. He said it really quieted it down. Also got rid of that "droning" sound inside the cab. I havent tried that yet.