What Exactly is Body Roll in Cars?


Thread Starter #1
Joined
Nov 13, 2011
Messages
399
Likes
30
Location
City of Pearls
Hi guys, I have a query, I have seen lot of people mention a so & so car has body roll or some other car doesn't. I tried to look for info on google but couldn't find proper info or maybe I didn't search properly. Could anyone please explain what exactly is this & what are the positives & negatives of this if any?

Thanks in advance
 

raj_5004

Honoured Member
Joined
Aug 24, 2009
Messages
5,890
Likes
1,142
Location
Dubai / Mumbai
ok, imagine this.

you are in a sedan like civic or fiesta. you are approaching a corner. you take the corner (right turn) at speed. you feel a slight push towards left. the entire car tilts towards left.

now you are doing the same thing in an SUV like scorpio or safari, the tilt would be more.

this is what is known as body roll. attached 2 images-
 

Attachments

Joined
Aug 2, 2011
Messages
2,765
Likes
437
Location
Pune
Wiki
On wheeled or tracked vehicles, body roll is a reference to the load transfer of a vehicle towards the outside of a turn. When a vehicle is fitted with a suspension package, it works to keep the wheels or tracks in contact with the road, providing grip for the driver of vehicle to control its direction. This suspension is compliant to some degree, allowing the vehicle body, which sits upon the suspension, to lean in the direction of the perceived centrifugal force acting upon the car. Anti-roll bars are a part of the suspension specifically designed to address body roll.

When a vehicle is fitted with a suspension there is compliance between the mass of the vehicle and the vehicle's contact with the ground. Body roll is the noticeable (either perceived or measureable) deflection produced when load transfer acts on the compliant elements of the suspension. Anti-roll bars directly impact body roll but their design intent is actually as a tool to adjust roll couple percentage or roll moment distribution.

Ke70 Skid Pan - HMAS Body-Roll - YouTube
 

TSIVipul

Honoured Member
Joined
Aug 6, 2011
Messages
6,183
Likes
4,189
Location
Meerut, U. P.
@Enfieldryder:
Body roll is something that every car comes with,in fact you may call it a standard feature on every car from a Tata Nano to Bugatti Veyron[;)],only difference is of its amount.

Actually center of gravity and suspension of the car,both plays a good role here in case of body role.Just see,if the suspension has long travel and the center of gravity is high,then on the turns that center of gravity will shift to outside(centrifugal force)and hence the suspension from inner side will open up and that on the outer will be pressed and hence tilting the body.
In case the travel of suspension is less than the shift of center of gravity then the car really rolls down and gets overturned..remember seeing overturned Omnis and Safaris too overturn a lot.Why?Both of them have a high center of gravity(Safari has massive weight too)and suspension travel isn't long enough to tackle hard steering inputs.
In case of sport cars,the center of gravity is low and suspension is tight and has quite good travel too and hence they never overturn...

I mean that the body roll is nothing but the tendency of a car to try to overturn on the turns,while suspension tries to prevent it by making the vehicle tilted.
 
Joined
Oct 9, 2012
Messages
1,758
Likes
2,038
Location
Riyadh/Kanpur
So, what is good? I mean what prevents turning turtle? A vehicle with a larger value of BODY ROLL or vehicle with a lesser Body Roll?
Most cars with higher CG (center of gravity) meaning hatchback like Nano, Ritz, Santo, (mainly tall boys) and SUV's like Scorpio, Sumo etc are more prone to body roll, so to counter this effect, manufacturers attach Anti-roll bars between the front suspension, and high end cars have them in the back also.
 
Top Bottom