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.