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How to add weights to a Sport Coupe Pinewood Derby car. It's as easy as ABC! 

Example of pinewood car
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How to add weight to a Sport Coupe Pinewood Derby Car

Sport Coupe

The heavier your pinewood derby car, the faster it will go. Most race rules limit the weight to 5 oz so you want your car as close to the limit as possible. The Sport Coupe block will need about 1.5 oz of additional weight to bring it up to the 5 oz limit.

You should install the weights in your car before you paint it.

Pinewood Derby Scale

Before adding the weights to your car, put the car block, wheels, axles and any other accessories that you will be adding to your car on a scale. Then add the weights until the total is 5 oz. (paint will add very little to the weight of your car).

When your car is complete, weigh it again. If it is over 5 oz, drill a few holes in the bottom of the block about an inch behind the front axle to remove some wood. 

Below are several suggestions for adding weights to your pinewood derby car.

Lead Wire Weights

Lead is inexpensive, dense and is easy to work with but lead is toxic. Always use gloves when working with lead and make sure that none of the lead is exposed after you install it in the block.

When weighing the car and weights, cut three weights so that they are approximately the same length. You can cut the weights with a hack saw, coping saw or wire cutters.

You will need:

  1. One set of Lead Wire Weights
  2. Drill and 5/16" drill bit
  3. Wood putty
  4. Sandpaper
  5. Hack saw, coping saw or wire cutters
Racer pinewood derby block with lead weights
  1. Clamp the car block on a flat surface. 
  2. Using a 5/16" drill bit, drill three equally spaced holes straight into the back of the block. Be careful to drill above the rear axle slot. The depth of the holes should be slightly deeper than the length of the weights.
  3. Remove the clamp from the block.
  4. Insert the weights in the holes. The end of each weight should be at least 1/8" into the end of the block. This will leave room for the wood putty. Drill the holes deeper if needed.
  5. Weigh the block, wheels, axles and weights again. Adjust the amount of weight if needed for 5 oz.
  6. Seal the weight holes with the wood putty. Allow to dry in a warm place for 12 hours.
  7. Sand the wood putty until smooth and flush with the car block.

You can now paint your car and add the wheels and axles. 

If the completed car is less than 5 oz. drill one or more shallow holes in the bottom of the car in front of the other weights and insert some of the leftover lead weight in the holes. Seal with wood putty.

Lead Wire Weights

Lead Wire Weights

3 oz. total weight
3 oz. wire weights
Body Putty for Pinewood Derby Cars

Wood Body Putty

ea.

5/16" Drill Bit

Drill Bits
Digital Scale

Digital Scale

Scale
To place your order:
1. Enter the quantity you would like to order next to each of the above items.
2. Click the "Add to Cart" button below.

Steel Cylinder Weights

Steel Cylinders are inexpensive and are safe to handle but they are not as dense as lead and cannot be cut as easily.

You will need:

  1. Set of Steel Cylinders
  2. Fine Tune Cylinder
  3. Drill and 3/8" drill bit
  4. Wood putty
  5. Sandpaper
Racer block with steel weights
  1. Using a 3/8" spade drill bit, drill three equally spaced holes into the bottom of the block behind the rear axle slot. Drill more holes in front of the rear axle to hold the remaining steel cylinders. The depth of the holes should be slightly deeper than the length of one of the Steel Cylinder weights.  Be careful to not drill through the top of the car. The holes will be close together so you should measure and mark the holes first or you can use our Weight Guide.
  2. Insert the weights in the holes. The end of each weight should be at least 1/8" into the bottom of the block. This will leave room for the wood putty. Drill the holes deeper if needed.
  3. Weigh the block, wheels, axles and weights again. Add some of the Fine Tune Cylinder Weight in one of the holes if needed for 5 oz. The fine tune Weight can be cut with any saw or a heavy duty scissors.
  4. Seal the weight holes with the wood putty. Allow to dry in a warm place for 12 hours.
  5. Sand the wood putty until smooth and flush with the car block.

You can now paint your pinewood derby car and add the wheels and axles. 

If the completed car is less than 5 oz. drill one or more shallow holes in the bottom of the car just in front of the drilled weights and insert some of the Fine Tune weight in the holes.

Steel Cylinders

Steel Cylinder Weights

3 oz. total weight
3 oz. Steel Cylinders
Body Putty for Pinewood Derby Cars

Wood Body Putty

ea.
Fine Tune Cylinder

Fine Tune Cylinder

Fine Tune Cylinder
3/8" Drill Bit

3/8" Spade Drill Bit

Drill Bits
Digital Scale

Digital Scale

Scale
To place your order:
1. Enter the quantity you would like to order next to each of the above items.
2. Click the "Add to Cart" button below.

Weight Guide

Weight Guide

Tungsten Weights

Tungsten is very dense but it is more expensive than the other weights. The density gives you a speed advantage because more of the weight can be placed farther back on the car.

You can use a combination of cylinders and a flat weight for optimum results.

You will need:

  1. Four Tungsten Cylinders
  2. One Tungsten Plate
  3. One Fine Tune Cylinder
  4. Drill and 3/8" drill bit
  5. Wood putty
  6. Sandpaper
  7. Screw driver
  1. Using a 3/8" drill bit, drill two holes into the bottom of the block behind the rear axle slot. The depth of the holes should be deep enough to hold one cylinder each.
  2. If more than two cylinders are needed, drill more holes in front of the rear axle. These holes should be deep enough so that the end of the weights will be recessed 1/8 inch into the bottom of the block. This will leave room for the wood putty.
  3. Weigh the block, wheels, axles and weights again (don't forget the flat weight). Adjust the amount of weight if needed by using part of the Fine Tune Cylinder. 
  4. Fill the weight holes in front of the rear axle with the wood putty. Allow to dry in a warm place for 12 hours.
  5. Sand the wood putty until smooth and flush with the car block.
  6. Paint your car and add the wheels and axles.
When the paint has dried and the wheels are on the car attach the flat weight to the bottom of the car under the two rear weights using the supplied screw. The flat weight will hold the rear weights in place.

Tungsten Cylinder

Tungsten Cylinder

$2.95   1/2 oz ea. (Recommend 4)
Tungsten Plate

Tungsten Plate

Tungsten Plates
Fine Tune Cylinder

Fine Tune Cylinder

Fine Tune Cylinder
Digital Scale

Digital Scale

Scale
3/8" Drill Bit

3/8" Spade Drill Bit

Drill Bits
Body Putty for Pinewood Derby Cars

Wood Body Putty

ea.
To place your order:
1. Enter the quantity you would like to order next to each of the above items.
2. Click the "Add to Cart" button below.

 

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