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MG MGA - Bedliner inside tranny tunnel?

What do you folks put inside the tranny tunnel to help with sound, and the like?

I've read the originals were coated with tar? Could be I remember that wrong but my battery box cover had a healthy amount on it. I was wondering about a modern alternative.

Someone suggested spray-on bedliner.

What have you guys used?

Right now it is coated in POR 15 only.

Thanks,
Christopher
Christopher Wilson

I was thinking about doing the same thing to mine. Whatever that was in there originally was sure nasty stuff. I think if you go with bedliner, be sure to get the professionally applied stuff. I've used the DIY kits and I think it would be difficult to get it thick enough for any appreciable sound deadening.
Del Rawlins

My car was bought new in Beaverton Oregon. At that time in this part of the country it was common practice to undercoat new cars before selling them. The undercoating stood up well over the years, and I found almost no rust when I rebuilt it 40 years later. I applied a little heat and was able to remove most of it with a putty knife. The remainder was cleaned off with a rag and solvent. I reapplied undercoating after all of the body and paint work was completed.

Ed Bell

Chris, I covered my transmission tunnel and everything else inside my coupe with Dynamat Extreme to try and reduce the noise. I won't know how successful I've been until it's back on the road in about one month. I'm also thinking of putting some more insulation over the tunnel before the carpet. It may be easier than doing the underside of the tunnel.

Andy 60 coupe

Andy Preston

Andy,
Where did you buy your material from. Was it pre cut or did you have to cut it yourself. Thanks Jeff
JEFF BECKER

All, May be off subject, but when I restored my Healey I used the Moss insulation, not precut, but carefully fitted it under carpet and firewall. If any of you have ever driven a non insulated Healey, you know what I'm talking about. It does wonders, especially when your sitting about 3" above some very hot mufflers. Donald put 2 under the drivers seat (LHD) in case heater failed. There is a solid 1/8" asbestoes panel between the mufflers and floorpans, but the dynomat or equal insulation is the best as far as heat transmission, never thought about sound that much. Bob TD#1720

R.AF. Robert Finucane

dont like the sound of having to use a "bedliner"! it sounds like something fitted to mattress to absorb any unexpected dampness!!!
Im hoping not to need one for many years yet.
could be useful in moments of emergency though, brake failure, long traffic jams etc
c firth

The "bedliner" referred to is a thick spray on coating used primarily to protect inside the the "bed" or cargo box of a pick up truck. Applied properly it is a 1/8 - 3/16 thick plastic looking coating.
R J Brown

Jeff, I purchased the 9 piece set (36sf) form Amozon.com. Dynamat has self adhesive on the underside so is very easy to install. I googled dynamat extreme and got several suppliers and prices. The price was very reasonable. I used the entire 9 pieces on the interior. It's very easy to cut the dynamat with a utility knife. I made templates with stiff paper for most areas.

Andy
Andy Preston

Christopher,
I used a material called Lizard Skin on the backside of the tunnel and the battery cover. It helps reduce both both heat and noise.
Cheers,
Gerry
G T Foster

you have set me going again!!
I wouldnt dare to admit to anyone that i was using a Lizard Skin Bedliner in my mga!
Sorry, i will keep quiet now!
colyn
c firth

Andy,

Can you let us know how this works when you get your car on the road?

Also, are you worried at all about dynamat holding moisture? What is it made of exactly?

Thanks,
Christopher
Christopher Wilson

Chris the dynamat is made of a thin (1/8")layer of black bitumen type material with aluminum foil on the upside. The bitumen side is self adhesive and sticks to the car body. The bitumen material is supposed to dampen the noise and the foil reflect the heat. Hope it works as well as claimed. There's no way that it can absorb any moisture. I hope to have the car back on the road in 4 weeks so will post the results.

Andy
Andy Preston

I'm interested to hear how Dynamat performs. When I googled it , it came up as sound proofing. Heat insulation was not mentioned. Looking at the picture above with the aluminium side upwards I can only see the reflected heat coming back up into the cockpit(ok I suppose there will be carpeting on top) and would have thought that for heat insulation it would need to have the aluminium side downwards. As a point of interest there is a thick underfelt kit available from Brown and Gammons which I have fitted but I also made up extra
insulation to go across and round the chassis cross bar above my feet which I find also gets very warm.
David
D C GRAHAME

This thread was discussed between 07/02/2009 and 11/02/2009

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