Does anyone sell 4 OZ tungsten discs?

[khouse]

Where is the best place to buy 3 to 4 oz tungsten weights? Thanks!

[frontosacam311]

I recently picked up a 3.8 and a 4.2oz disc. Shoot me a pm and I'll tell ya who has a couple left.

[derbydominator]

Khouse,

Maximum-velocity has 3.25 oz. disks and piinewoodextreme has 3 and 3.5 oz. disks. I am considering the idea of supplying them for this next season. Are you looking at the disks specifically because of the shape or is your interest in weight concentration? The cubes are the most effective means to concentrate the weight in the car and provides the most options. As an alternative, the half ounce cylinders can be placed end to end 4 across the car in two rows and make up 4 ounces of weight in a space only 1" in car length. Obviously, that would be slightly over 1/2" in height unless you have the bottom of the hole partially protrude out the bottom of the car which is ok as well. One may also use the cylinders vertically in various patterns.

Here are two of the sites for the discs. They have cubes and cylinders as well.

www.pinewoodextreme.com/product.asp?product=Tungsten
www.maximum-velocity.com/speed_supplies.htm

If you're interested in the cubes or cylinders, my site is:

www.derbydominator.com/Weights.htm

I hope that helps. Have a great day!

[humvderby]

Derbydominator,

How do you condense 24 Tungsten 1/4" cubes ( which = 4 oz.) into a space the size of a 1" x less than 1/2" thick Tungsten Disc (which is 1" Diameter x a little less than 1/2" thick and weighs 4.2 oz.) The 3/8" .5 oz cylinders won't make it either.

I don't see how the cubes are the most effective means to concentrate the weight. To concentrate the weight is to put it in as small an area as possible. Well 24 (1/4")cubes are going to be quite a bit larger than a 1" Disc.

From what I have seen the discs are the most concentrated weight avaiable.

By the way, Maxv's Discs are much more dense than Pinewood Extremes. Maxv's Discs are smaller and more concentrated. Drill a 1" hole for Maxv's where as PE's are 1 1/8" in Diameter and require a hole 1 1/8" Diameter.

Just my .02 cents worth.

[DerbyDoc.com]

Aug 24, 2008 0:58:45 GMT -6 @humvderby said:

Derbydominator,

How do you condense 24 Tungsten 1/4" cubes ( which = 4 oz.) into a space the size of a 1" x less than 1/2" thick Tungsten Disc (which is 1" Diameter x a little less than 1/2" thick and weighs 4.2 oz.) The 3/8" .5 oz cylinders won't make it either.

I believe that if you were to lay 12 cubes in a rectangular form, then stack 12 more on top of those, you would have a 1/2" X 1" X 3/4" mass of tungsten compared to the 1/2" X 1" tungsten round. Thats a pretty close comparison.

[octom]

I prefer the cylinders but then I turn the body on a lathe so it lends itself to the cylinder.

[derbydominator]

Hey Road Runner,

You are quite right about the difference between Maxv and PE. I believe it is in the way that the discs are made, but the difference in density is quite distinct. I expect to be supplying the discs for this coming season and look forward to working with them more myself. They are more simple and have a very nice look in addition to being very compact.

As for the weighting, I do not have all of the dimensions for the discs, only for the 3.25 from maxv and the 3.5 from PE. For the more dense of the two, the 3.25, you would get one weight covering a width of 1" that is 3/8" in height. You would then need to place .75 oz in weight around the disc (placed at the corners) to make up 4 oz. For the 4.2 oz. disc, it would be a slightly greater height disadvantage but less space taken across the width of the car.

For cubes, it would require 4 rows of the 1/4" cubes laid 6 across. This would be 4 ounces total and take up only 1/4" in height.

In comparing the two examples, both would take up 1" in car body length and give a COM for that 1" weight area of 0.5". The cubes would account for a lower profile by 1/8" but the disc would potentially take up less space across the width of the car depending on the size of the additional weights needed to fill out the 0.75 ounces. In terms of flexibility of their application, the disc can only be placed in front of the rear axle with a small portion of the disc taking up the area between the axles. The 0.75 oz could be placed behind the rear axle. With cubes, one could place any ratio of the cubes in front of, in between and behind the rear axle to adjust the COM and allow for different design parameters.

An additional option if I were to set the height limit at 3/8" to be even with the maxv disc, I could place three rows of cubes 6 across and two tungsten plates over the first two rows to make 4 ounces and take up only 3/4" in car body length for a lower COM. Compared to the 1/2" tall disc, DerbyDoc's idea of 2 rows of 6 cubes stacked two high would take up only 1/2" in body length for the same height.

The cubes allow for more weight in a smaller area in the car and more flexibility to adjust the COM but just look at the recent winners in WIRL pure stock, Alastor and Raptor and that tells you the discs work.

In the end, it becomes personal preference and you can't beat the clean look of the discs, but the more compact spacing, lower profile and design flexibility of the cubes gives me more options. However, I would welcome any thoughts on the discs that I have not considered here as my experience with them is minimal compared to the other options.

Darryl