# Car's Center Gravity of Height

Hi, Im calculating about Drive Brake system. Now Im stuck at Hg (I mean car's center gravity of height), I just don't know how to calculate it.
Will anybody help me ? Im really need it
I look forward to your reply
Best Regards,

## Answers and Replies

if the shape of the car is simple like a double box car or box type sedan then simply divide the car in three sections of front , middle and rear, choose an origin. Further it is a basic problem

Ranger Mike
Science Advisor
Gold Member
see old post Jul22-09, 11:03 AM

Race car suspension Class

jack action
Science Advisor
Gold Member
I just don't know how to calculate it.

What don't you know? Measuring the CG height on an actual vehicle or estimating the CG height of your concept car from drawings or maybe even something else.

Ok, here I got :
Height x Width x Length = 2740 x 2060 x 7080 (mm) = 107,874 x 81,1 x 278,74 (Inch)
wheelbase = 4085 (mm) = 160,83 (Inch)
Car weight (no load) = 4160 (Kg) = 9152 (lbs)
Front Axle weight = 2130 (Kg) = 4686 (lbs)
Rear Axle weight = 2030 (Kg) = 4466 (lbs)

So, can you help me calculate the Car center of gravity of height (y-axis). Im thanks so much !
Thanks for interesting and helping me

jack action
Science Advisor
Gold Member
Ok, here I got :
Height x Width x Length = 2740 x 2060 x 7080 (mm) = 107,874 x 81,1 x 278,74 (Inch)
wheelbase = 4085 (mm) = 160,83 (Inch)
Car weight (no load) = 4160 (Kg) = 9152 (lbs)
Front Axle weight = 2130 (Kg) = 4686 (lbs)
Rear Axle weight = 2030 (Kg) = 4466 (lbs)

So, can you help me calculate the Car center of gravity of height (y-axis). Im thanks so much !
Thanks for interesting and helping me

With these numbers, it's impossible to determine exactly. Best guess would be somewhere between one third and one half of the height of your car (which seems really tall!).

So, what do I need to determine exactly the CG height ? Please help, just a little more. I got the most specification of the car

Get the all aggregate weights.Locate their indiviusal CGs in the car. Then you can easily calulate the CG position by simple CG formula x=(m1x1+m2x2)/(m1+m2) similarly y and z.
Hope it will help you.

Ranger Mike
Science Advisor
Gold Member
i recommend the old racers trick of measuring the height from pavement to center of the camshaft and measure height from pavement to center of rear axle hub
draw a line from camshaft center to rear axle center line ( between the two axles) this is good approximation of mass centroid going thru the vehicle ..the other method is to use scales under the rear wheels and jack up the from end at least 30 inches ..this requires scales and if you have access, i can give you formula..i wrote more in other posts. last year