Building a solid demolition derby battery box is one of individuals small details that'll either keep a person running in heat or leave you dead in the particular water after the first big hit. In case you've ever invested weeks welding, stripping, and prepping a car just in order to possess the engine reduce out thirty seconds into the function because a battery terminal snapped or the whole device shifted, you know specifically how frustrating it really is. It isn't nearly holding the battery in place; it's about making sure that heavy wedge of lead plus acid stays where you put this while the rest of the car has been folded like a good accordion.
Why a Standard Mount Won't Cut It
In the regular road car, the battery is usually held straight down with a flimsy plastic wedge or the thin metal band. That's perfectly fine regarding potholes and highway speeds, but the demolition derby is a completely different animal. You're searching at massive G-forces, sudden stops, and frame-twisting impacts. In case you leave your battery in the particular stock location under the hood, you're asking for trouble. Not only will be it in the "crumple zone" exactly where it could get crushed or shorted out with the radiator or even core support, yet it's also the massive fire hazard.
Most monitors require you in order to move the battery towards the interior associated with the car, usually on the passenger side floorboard. This keeps it far from the primary impact zones and makes it easier for you to achieve if something goes wrong. But just tossing it on the floor isn't enough. You require a dedicated demolition derby battery box that can deal with the abuse.
Materials and Design
When you're looking for a box, or developing one yourself, "heavy duty" is the only way to go. Many guys in the pits will tell a person that plastic store-bought boxes are a waste of time. They will might look wonderful, but under the stress of a head-on collision, that plastic can crack or even the mounting factors can tear right through.
A suitable box should become made from steel. Whether it's heavy-gauge sheet metal or constructed from angle metal, it needs to be rigid. You would like something that won't bend once the floorboard begins to buckle. A lot of builders try some fine "cage" style box produced from 1-inch position iron. This provides you numerous of spots to secure the battery and ensures that will even if the car gets turned, the battery remains cradled in the metal skeleton.
Bolting it Down
How you attach the box to the car is simply as important as the particular box itself. A person can't just make use of a number of self-tapping anchoring screws and call it a day. The standard practice is in order to bolt the box directly through the floorboard using high-grade bolts—usually Grade 5 or better.
It's furthermore a smart proceed to use large "fender washers" or even a backing plate on the bottom of the car. Floorboards are surprisingly thin, and within a hard hit, a small bolt head can pull through the page metal. By using a backing plate, you're spreading that force across a larger surface area, producing it much less most likely that your battery box becomes the projectile inside the particular cabin.
Obtaining the Battery Inside the Box
Once the box is mounted, you've got to make sure the battery doesn't bounce around inside. Even an inch of "wiggle room" can be harmful. Since the car vibrates and takes hits, that battery may act like a hammer, slowly beating against the sides associated with the box until something breaks.
Using Hold-Downs
Forget about bungee cords or zip ties. They'll breeze or stretch the second things obtain hairy. You want a strong metal hold-down throughout the top associated with the battery. A lot of custom boxes come with a band or a bar that bolts down, sandwiching the battery directly into the frame.
If you're using a standard group-size battery, guarantee the hold-down is limited enough that you can't move the particular battery by hands. Some guys also use a bit of rubber matting or old fireplace hose inside the box to consider up any spaces and provide a small amount of shock absorption. It sounds like overkill, but it will save the battery covering from cracking during those bone-jarring strikes.
Thinking Regarding Safety and Guidelines
Every track has its own rulebook, and the demolition derby battery box is normally a single of the very first things they appear at during technology inspection. Most officials are looking with regard to three things: stability, location, plus a cover up.
The Importance of a Cover
Even if your box is made like a container, you usually need a non-conductive cover over the top. This is to prevent "arcing. " Imagine the roof of your car getting pressed down or the piece of particles flying through the particular window. If the metal object details both battery ports at once, you've got an quick fire or an explosion.
A lot of guys use a piece of heavy rubber—like an old mud flap or a floor mat—and zip-tie it over the top of the battery. It's basic, cheap, and it passes tech. This keeps the terminals protected while nevertheless letting the battery vent.
Working with Battery Acid
If you're using a conventional lead-acid battery, there's always a likelihood of it leaking when the case cracks. For this reason a lot of derby drivers have got switched to AGM (Absorbed Glass Mat) batteries. They're sealed, so they won't leak acid throughout your floorboard even when they're mounted sideways or the situation gets dinged. Plus, they have a tendency to handle vibration much better than the old-school flooded batteries. If you perform go with a standard battery, make sure your box has a solid bottom to capture any leaks, or at least keep the acidity from spraying directly onto your legs.
Wiring and Cable Management
The particular best box within the world won't help you save if your own wiring is really a mess. When you transfer the battery towards the interior, you're running much longer wires compared to factory meant. This means you require thicker wire—usually 2-gauge or 0-gauge—to create sure the starter gets enough juice.
Make sure your cables are usually secured and saved. If they're simply flopping around on the floor, they can get pinched by shifting body panels or even even caught below your feet while you're trying to work the throtle. Use rubber grommets wherever the wires move across the firewall. The last thing you would like is the razor-sharp edge of a hole you reduce to vibrate via the insulation plus short out your whole electrical system mid-round.
Final Checks Before the Green Flag
Before you head out to the track, give that box one last "tug test. " When you can move it even a fraction of an inch, this isn't tight plenty of. Check the terminals and make certain they're clamped lower hard. A shed terminal is a classic rookie mistake that ends a lot of evenings early.
It's easy to focus on the particular flashy stuff such as the paint work or the engine track, but the reality is that the boring stuff—like how your battery is mounted—is what wins derbies. A car that won't start is usually just a target. By spending the extra time to construct or install a high-quality demolition derby battery box , you're giving yourself the particular best chance to function as the last one particular moving when the smoke clears.
Retain it heavy, keep it bolted, and keep it covered. It's not really just about passing tech; it's about making sure your car stays alive long enough to dish out the hits rather of just using them. Don't let a $5 bolt be the reason you're loading your own car back on the trailer ten minutes into the show. Get that will box secured, double-check your connections, plus you'll be one step closer in order to that trophy.