Vertical center of gravity

2010

How do I find the vertical center of gravity of my go-kart and how does it affect my handling?

Answer: The following instructions together with a good set of scales will show you how to find your vertical center of gravity (VCG). Vertical center of gravity is the single-most important aspect of setup that will determine the amount of “side bite” that your kart has. You may have seen two identical karts that are scaled out and setup exactly the same, but one kart performs quite differently than the other. Very often this can be traced back to a different vertical center of gravity.

Here is an easy and relatively simple way if finding your vertical center of gravity.

What you need:
1) 1/10 pound scale set
2) Extremely level scaling stand
3) Calculator
4) 2 blocks eight inches high (it is vitally inportant they are exactly 8″).

Here’s how to find your VCG:

You need your 1/10 pound scale set, and to have your kart set up as if you were about to go out on the track (tach mounted, oil, fuel, helmet; all in race condition).  You also need a set of blocks eight inches tall.

First, weigh the kart normally, then record the total weight (T) and the total number of pounds on the front tires-nose weight (N).  Then carefully place the blocks under the rear scales (you may find it useful to lock your rear axle). And record your new nose weight (NI).  Next, subtract your original nose weight (N) from your new, lifted nose weight (NI) and you will have the difference (Nd).

Get out your calculator…

a. Multiply the nose difference (Nd) x 1660= (A)

b. Multiply the total weight (T) x 8 (the height of the blocks)=(B)

c. Divide your previous numbers, A by B, and this equals ©

d. Add this number, C, to your axle centerline height (usually 5.5) and the number you obtain is your vertical center of gravity.

Here’s how to find your VCG:

You need your 1/10 pound scale set, and to have your kart set up as if you were about to go out on the track (tach mounted, oil, fuel, helmet; all in race condition).  You also need a set of blocks eight inches tall.

First, weigh the kart normally, then record the total weight (T) and the total number of pounds on the front tires-nose weight (N).  Then carefully place the blocks under the rear scales (you may find it useful to lock your rear axle). And record your new nose weight (NI).  Next, subtract your original nose weight (N) from your new, lifted nose weight (NI) and you will have the difference (Nd).

Get out your calculator…

    a. Multiply the nose difference (Nd) x 1660= (A)

    b. Multiply the total weight (T) x 8 (the height of the blocks)=(B)

    c. Divide your previous numbers, A by B, and this equals ©

    d. Add this number, C, to your axle centerline height (usually 5.5) and the number you obtain is your vertical center of gravity.

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