stock classification
 

If the engine factor is 23.08 and the shipping weight is 2770 what/ or how do you figure what class the car falls into??? comp 387

Re: stock classification
 

If it's a V8 = U/S or U/SA

If it's a four or six cylinder = V/S or V/SA

if it's a four cylinder w/added weight = W/S or W/SA

If it's FWD = D/F

Re: stock classification
 

Thank you but do you ever divide pounds per cube or cubes into weight when doing this??? Thanx FED 387

Re: stock classification
 

No Sir!

Re: stock classification
 

So 23.08 is how you determine which class you are in AND 2770 is the minumum the car can weigh for that class correct???... At what point does the 170 pound driver figure come into play as part of the 2770 or is it added to the 2770 or is the car weight 2770 LESS 170 to determine the minimum car weight???? Thanx FED387

Re: stock classification
 

well, it's not the cubes that they divide into, it's horsepower (real or factored) but i'm waiting to be eddykated on how the drive weight stuff works.
i havent seem 170 lbs in 30+ years;)

Re: stock classification
 

The basic formula is Factor x NHRA HP + #170 (driver)= Min. Weight.

The issue here is determining the correct factor for this combo. Like Chuck stated above, if it's a V-8 the heaviest V-8 class is U and the factor is 20.00 or more.

If it's a 4 or 6 cyl. it falls into V and the factor is 22.00 or more. (23.08 listed factor) So you use 22.00 as your factor for V.

Now all you need is the NHRA HP to figure your weight.

Re: stock classification
 

NHRA site lists a 151 cu in 4 cyl engine at 90 hp and a "factor" of 23.08 and a shipping weight of 2770 so it is a V class but what is the least it can weigh??? And do you thnen add the driver or will that weight include a 170 pound driver??? FED387

Re: stock classification
 

Dick , If you want to run V ,which is it's natural class, it's 22 x 90=1980 + 170 = 2150 . I doubt it's that light , but you want to run W anyway, which is a 4 cyl class (24 lbs) (two more lbs per hp) so add 90 twice and you got it.
It's not FWD ,is it? PM me if you want.

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.