stock classification

Dwight Southerland · 07-10-2009, 09:51 AM

What it seems is confusing you is the additional 170 lbs. added in for the driver. Here is how that works:

For classification purposes only, the shipping weight of the car as supplied by the manufacturer (in this case 2770 lbs) is divided by the power factor (120) to get the power to weight factor (23.04). The power to weight factor and, in this case the engine type (4 cyl), determines the classification. Since there is no 23 lb/hp class, you can adjust weight to make either V (22 lb/hp) or W (24 lb/hp) .

For actual race weight, the tech guys will calculate the class factor for V (22) or W (24) times the power factor (120) to get the minimum weight for the class. 22 x 120 = 2640 for V, or 24 x 120 = 2880 for W. Then they will add 170 for the driver and the total is the amount the car must weigh when it goes across the scales with the driver in it . For a V car, 2640 + 170 = 2810 lbs; for a W car, 2880 + 170 = 3050 lbs. It does not matter that the driver actually weighs 170 lbs, just that the scale weight is correct with the driver in the car.

I am assuming you are looking at a 1982 Camaro with the 151 4-cylinder factory rated at 90 hp and NHRA factored at 120.

07-10-2009, 09:51 AM	#9
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,001 Likes: 64 Liked 780 Times in 194 Posts	Re: stock classification What it seems is confusing you is the additional 170 lbs. added in for the driver. Here is how that works: For classification purposes only, the shipping weight of the car as supplied by the manufacturer (in this case 2770 lbs) is divided by the power factor (120) to get the power to weight factor (23.04). The power to weight factor and, in this case the engine type (4 cyl), determines the classification. Since there is no 23 lb/hp class, you can adjust weight to make either V (22 lb/hp) or W (24 lb/hp) . For actual race weight, the tech guys will calculate the class factor for V (22) or W (24) times the power factor (120) to get the minimum weight for the class. 22 x 120 = 2640 for V, or 24 x 120 = 2880 for W. Then they will add 170 for the driver and the total is the amount the car must weigh when it goes across the scales with the driver in it . For a V car, 2640 + 170 = 2810 lbs; for a W car, 2880 + 170 = 3050 lbs. It does not matter that the driver actually weighs 170 lbs, just that the scale weight is correct with the driver in the car. I am assuming you are looking at a 1982 Camaro with the 151 4-cylinder factory rated at 90 hp and NHRA factored at 120. Last edited by Dwight Southerland; 07-10-2009 at 09:54 AM.