| Author | Message | ||
| Bobbo (66.214.112.169)
Rating: N/A |
Hi Guys and Gals, We own a 1980 MC-9. We are wondering what everyone is using on the floor to deaded the road and engine sound? We plan on putting 3/4 plywood over the existing floor, Will that be enough to deaded the sound? Thanks Bobbo | ||
| TWO DOGS (65.179.192.134) Rating: N/A |
are you saying you don't like the sound of an 8v-71 ???  My Eagle has 3/4 plywood....1/8" cork & 1/8: linoleum | ||
| Ray D (68.126.143.11)
Rating: N/A |
Bobbo, Plywood is effective, but one 3/4" ply is not going to reduce a diesel enough for you. 2 sheets of 1/2" ply with sheet lead in between is ideal. There is also a 3/4" plywood sound board, one of the plys is a dense lead substitute (Dick Wrico sells it), works good, but is about $100 dollars a sheet. I used 3/4" sound insulation (like soundown stuff)with a lead type core and put it under the floor, I found it surplus at a very reasonable cost. But whatever you use to keep engine noise out, it has to have something in it that is very dense to take care of the low sound frequencies. Also, seal and caulk all cracks, plywood seams and holes up. | ||
| Bruce King (67.170.101.3)
Rating: N/A |
If you are anywhere near a boeing surplus store (seattle and witchita, ks) you can usually find large rolls of insulating matt that they use on the aisles of airliners. It's usually two part, a thick dense rubber skin and a softer lighter rubber matt that are glued together. The two weights of rubber are for the different sound frequencies blocked. Noone buys the stuff 'cause noone knows what it is, but it's basically equivalent to the sonoblock stuff that sells for $2 a foot or more, and it makes excellent carpet pad or cushion under something like a pergo floor. I bought enough of it to cover the entire floor area of the bus and put it down first, built everything on top of it. Look for 8' wide rolls about 3' thick. Think carpet rolls, but heavier. Prices vary. | ||
| Bobbo (66.214.112.169)
Rating: N/A |
Hi Guys, Hey Two Dogs, I love to hear our 6V92 purr, but I have 4 kids that seem to disagree with me. I Think we are going to give Wrico a call tomorrow and see what he has. Thanks for all the help guys. I almost forgot, I have another question for you guys. Why do I hear about some guys using roofing felt? Does this stuff work to deaden sound or do they us it for a different reason? Bobbo | ||
| John that newguy (199.232.240.171) Rating: N/A |
With 4 kids, how -would- you hear the engine? | ||
| Bobbo (66.214.112.169)
Rating: N/A |
Hi John, When they are taking a nap. To bad they don't sleep all day. he he he! But on the serious side I love my kids and would be willing to stop hearing my Detroit purr down the road just for them. Bobbo | ||
| John that newguy (199.232.240.171) Rating: N/A |
Hah... Yeah. Ours is 37 going on 12. I know how you feel! That Boeing mat that Bruce described sounds like the way to go, but may be too difficult to locate. Generally, the engine noise is only loud at the rear and not too disturbing at the middle or front. Have you considered just insulating the area directly over the engine? Styrofoam sheets and/or the rubber matting that's used for the Pergo type flooring may deaden the sound enough to live with. Carpeting alone should do it, but it'd never hurt to add some extra material under it. I would keep in mind, that anything "soft" will deteriorate under weight eventually and may make repairs difficult, unless provisions are made in advance. Back in the archives, someone posted the use of rubberized undercoating inside the engine compartment to help deaden sound. I'm not sure of the fire hazard involved without seeing the product, but that also may be something to consider. Of course, you could let the kids sleep in the rear... with the engine running, it would give mom and pop some errrrr....privacy. A friend once mentioned that after 20 years of marriage, they still use a jar of Vaseline a week. I said "really?" He said "yeah, but now we put it on the doorknob to keep the kids out". |