Project Speed Bump Part 11:

Part 11: Quiet Where We Want It


Quiet where we want it

Project Speed Bump is look­ing more and more like a truck these days, and we are turn­ing our attention to get­ting the cab prepped for its in­te­rior. While we are the first to ad­mit we love to hear a me­chan­i­cal sym­phony un­der foot, we also en­joy a lit­tle peace and quiet when cruis­ing down the high­way. Ad­di­tion­ally, we know older rides with­out in­su­la­tion can hit ex­treme tem­per­a­tures in less than ideal weather. In or­der to make sure Speed Bump is as pleas­ant as pos­si­ble for those long drives, we de­cided to head back to our friends at LMC Truck and or­der up a few boxes of their EVA sound-dead­ener mats.

LMC’s EVA mats are made from 1/16-inch-thick ethyl vinyl ac­etate (EVA), an as­phalt-based ma­te­rial that ab­sorbs sound and vi­bra­tion. The 30x24-inch alu­minum­backed EVA sheets are self-ad­he­sive, eas­ily cut to size, and mal­leable to any in­te­rior sur­face. LMC also has an avail­able roller, which makes in­stal­la­tion over the stamped steel ir­reg­u­lar­i­ties of floor­boards and body pan­els a breeze. These sheets should do a good job mak­ing for a quiet cab, and when used in con­junc­tion with the Line-X un­der­coat­ing we in­stalled back in Part 7 and the in­su­la­tion we plan to add when we in­stall the car­pet, we should be able to keep the in­te­rior tem­per­a­ture right where we want it.

While we were at it, we also put in a new wind­shield and rear win­dow and re­built our vent win­dows with parts and rub­ber seals from the com­pre­hen­sive LMC Truck parts catalog. Lastly, we cov­ered the in­te­rior side of the fire­wall with LMC’s in­su­lated ABS plas­tic fire­wall pad. Man­u­fac­tured us­ing a molded ABS plas­tic shell to match the shape of the fire­wall with pre­cut holes and sound in­su­la­tion back­ing, it should also help to iso­late the in­side of the cab from what­ever is go­ing on in the out­side world, while still let­ting in enough turbo noise to keep the smiles on our faces.

With any luck, Speed Bump’s cabin will be a great place to be dur­ing a road trip. We’ll need it, too, es­pe­cially with plans to in­fil­trate HOT ROD’s Drag Week or drive from SoCal to The Wood­ward Dream Cruise next year. With Speed Bump’s cab fully in­su­lated, we’ll be turn­ing our attention to wiring, in­te­rior, and au­dio in the near fu­ture.

2. Here you can see the new LMC-sourced door seals be­ing tem­po­rar­ily held in place by tape while the ad­he­sive sets. When us­ing weath­er­strip ad­he­sive, we made sure to ap­ply it to the rub­ber, rather than to the body, to en­sure a stronger bond.

3. Our tired old vent win­dow frames were worn out, pit­ted, and in se­ri­ous need of an over­haul. We stripped them down and had them re­fin­ished be­fore re­build­ing them with parts from the LMC catalog.

1. LMC Truck’s catalog is full of just about ev­ery­thing you need to re­build your truck, in­clud­ing all the glass and rub­ber for your ’67-to-’72 F100. For Speed Bump, we re­placed the wind­shield, back­light, and side glass.

4. After we picked up our newly fresh­ened frames from the pow­der­coater, we dropped them off at the glass shop and had the vent win­dows set in the frames with glass set­ting tape.

5. Note the win­dow latch and hard­ware of the ’67 F100 is a dif­fer­ent de­sign than that of later years.

8. Next, we turned our attention to the LMC Truck EVA sound­dead­ener mats. These 30x24inch mats are ad­he­sive-backed and eas­ily mold to the con­tours of any floor pan.

9. LMC Truck of­fers this small rolling tool, which helps speed up the in­stal­la­tion of the EVA mat by mak­ing it eas­ier to form to the truck and ad­here in tight places.

6. Mov­ing to the vent win­dow frame, we in­stalled a new gas­ket, which makes a wa­ter­proof seal when the vent win­dow is closed.

7. The com­pleted win­dow chan­nel and vent win­dow frame form one unit that is ready to be in­stalled in the door.

13. The ABS fire­wall pad is shaped to con­form to the fire­wall and has knock­outs for var­i­ous holes. The pad is backed with in­su­la­tion ma­te­rial, which should help keep heat in the en­gine bay.

14. Be­fore we could in­stall the pad, we had to first re­move the steer­ing col­umn and our park­ing brake assem­bly.

15. We then trimmed the pad to fit around our brake pedal bracket assem­bly and ididit steer­ing col­umn.

16. With the pad trimmed to our sat­is­fac­tion, we mocked it up and re­in­stalled the park­ing brake assem­bly and steer­ing col­umn. This par­tic­u­lar part is a close, but not ex­act, fit. It took us time, pa­tience, and a lit­tle fi­nesse be­fore we were happy with the fit.

18. De­spite be­ing a fairly time-con­sum­ing process, our pa­tience and per­sis­tence paid off and we were re­warded with the re­sults we were look­ing for.

17. Once the pad was where we wanted it, we used these LMC-supplied push re­tain­ers to lock it in place.

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