LARGER Compressor mounting for Pacbrake

[Motorhead]

I hope the moderator will leave this here as more guys will see it and maybe get me a good answer.
My '07, 5.9 has a PRXB Pacbrake mounted on it and it has worked flawlessly for 5 years. I used the supplied small Viair compressor that mounted at the front of the engine above the intake manifold and the .5 gallon tank.
This last trip I took, I needed air supply to fill a low leaking tire out in the "Boonies". It did a very poor job trying to inflate a 285-75-17 tire. I could get it only to about 50psi and it took a "Month of Sundays" to fill.
SO........ I ordered the LARGE Viair 480c, 100% duty cycle, 200psi capable compressor, a Viair compressor mounting bracket and a Viair 2.5 gallon, 200psi tank.
I mounted the compressor bracket on the FRONT PASSENGER, inside rocker panel and the tank just behind it under the right rear seat floor.
I rubber mounted the bracket with grommets to the rocker panel and the compressor is also rubber mounted with the supplied grommet feet.
When the compressor cycles on, it is noisy and transmits into the cab. Atleast NOW, I have 145psi air, a good volume tank and a fast recovery compressor.
The ISSUE is the NOISE! Anyone got a good suggestion on quieting things down? I want to keep the compressor located where it is or in a well protected place. Any of you guys mounted a compressor on your trucks and had a good success with them being quiet? I'll try to take some pics and post them.

 

[RDThompson]

I had a tank like that on a different truck. It ran airbags, exhaust brake and air horns. It was terribly noisy even being mounted under the bed. I shot the tank with undercoating and it quieted down considerably.

 

[Motorhead]

Thanks Bob. I'll run it and get under the truck where the tank is ans give it a listen. Did you use a rubber base, aerosol type undercoat?

 

[seafish]

You could also apply CLD tiles (constrained layer damper) to the inside of the rocker panels and on the floor at 25% coverage to help reduce the noise inside the cab. It really works to stop pamel vibration that transmits noise. That being said, also applying a layer of CCF (close cell foam) and MLV (mass loaded vinyl) inside the rocker panel and under the floor will help even more. Most people apply these things to INSIDE the cab to quiet down the entire cab to make it a better listening envireonment for sound quality stereos, but as all of the materials (CLD is made from aluminum and butyl rubber, CCF is closed cell so cannot hold moisture and MLV is vinyl) are weatherproof, there is no reason you couldn't apply it with the right adhesives to areas of the underside of your truck, near and around your compressor and tank locations. Of course, applying it to the inside of the cab would be much more effective, it would also be much more labor and cost intensive. To read about these materials, and possibly purchase them, go here, a VERY reputable site with excellent quality products at fair prices, kind of like the Gernis Garge of sound insulation--

http://sounddeadenershowdown.com/

If you have any specific questions, Don who owns the site, is best contacted by email in the morning, though sometimes he CAN take a few days to reply depending on how busy he is. If he does not reply the first itme, give him another email--he really likes to help, but IS a sole proprietor.

Spraying the storage tank is also a decent idea but there are specific sound deadening sprays that are better then simply a rubber coating. Of course, they are also more expensive...I believe that Cascade audio engineering makes one of the best spray deadeners.

 

[seafish]

Of course, the more you can isolate the compressor mounting from the frame, say with better quality isolation mounts, the better off youll be also.

 

[RDThompson]

I'm sorry, I don't remember the name of the product. It was an over the counter spray on from NAPA.