Datsun Roadster Forum-311s.org

Hi all
To reduce engine noise, do you guy would recommend applying under coating on the engine bay? I have used it under the body and wonder would it be a good idea to apply it on the engine bay,
It add texture and seem durable with pain over it. Have anyone had used it on the engine bay and would you suggest it?
Any feed back would be appreciated.


Thanks
Ben (Datsundude)

My two cents-I would not use that spray on rubber undercoating. If you really want to do it use some of the tuck bed liner coating. It is alot more durable than the actual undercoating. Plus I think you can get it in different colors. I prefer to paint the engine bay the same color as the car or if on a string shoe budget at least close.

Steve

Another option is to Dyno mat the interior floor and any flat area you can to help with noise. Even though these are open top cars some dyno mat can reduce vibrations and make the car feel more solid.

Alexi

Ben,

I would apply a insulation / noise barrier on the inside of the firewall, seal all firewall openings and install a removable under hood noise insulation. You can also apply insulation under the carpets and inside the doors as well, add a hard top to complete the sound proofing and your set to go.

Companies make insulation products for what your looking for.

Spraying the wheel wells and firewall is not a good idea.

I perfer wind noise ( top down), hearing the engine performing, transmission noise going thru the gears and the tires in a perfect drift, but go figure.

JC

Thanks all,
Two reason that I want to use the spray on under coating is, spray paint seem very durable over under coating, I did an experience on it, when the paint dry over the under coating it is very durable, won’t chip off that easy comparing without the under coating.
Second, I have removed 90% of the paint with steel brush where I can easily reach, down to bare metal except those corners that the steel brush is unable to reach; I also used paint remover works great but time consuming.
So if I apply just paint without under coating, those corners that I could not reach will chip off and have an unsmooth finish where those hard to reach corners is.

I absolutely agree with you guys on keep the engine bay the same color with the body; according to manufacture, this product is paintable under coating. So a layer of paint will apply over the under coating.

Do you guys see any down side of it or impact using this product?
Any suggestion will be appreciated.


Thanks
Ben (Datsundude)

Dyno mat the interior is not a bad idea, I like that. What will be the down side of it? Will it maintain moisture?
Where can I get them?


Thanks
Ben

you can find dyno mat at stereo shops or on the internet.

The only down side to using that undercoating in my opinion is if you cover over any rust. That stuff will just sit there and eat your car without you knowing. Up here in No Cal we just paint with a semi gloss black and it holds up great. If you are really worried about rust remove the body and get rid of the mo hair!

Alexi

Alexi,
Thanks for the feed back. can you feel a big different after you installed the Dyno mat? meaning it much quieter...I have seen them on the modern car but never on classic, will the carpet hold down good with the Dyno mat under?


thanks
Ben

I have never installed dyno mat. I just watch the discovery channel like everyone else and overhaulin. For my taste I like to hear the engine wine and the exhaust growl. These cars were never meant for creature comforts.

Look into though if you are interested and let us know.

Alexi