Roll Center & Vehicle Body Roll - Explained

The body roll of a car is influenced by the distance between the roll center and the center of gravity of the vehicle, The larger this distance, the larger the roll moment, and thus the more body roll the vehicle has. By manipulating the suspension geometry, you can alter the amount of body roll by increasing the height of the roll center and bringing it closer to the center of gravity.

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[sergiovalenzuela]

Currently working as a vehicle dynamics engineer in a shock absorber company, and i must say this is the most accurate vid i have ever seen, great job man, all your vids are gold! I love all of them and i put a smile on my face when i saw a vid related to my job :) you're helping me a lot with knowledge about all cars' areas

[ecobogan]

You've got a very good way of relaying technically complex information. Impressive teaching skills.... quite a rare thing. Please keep it up!

[muasboy]

After this video published ->Extended ball joints experienced an increase in sales hahaha. Good video

[teku]

As a mechanical engineering student and as a car enthusiast, your channel is the best place to go :D

[robster]

Wow! Your explanation was very complex, technical, mostly importantly; delivered in such a way that a person who doesn't have any idea about automobiles and how they functioncan simply understand/comprehend.

[Jgambina]

All of the videos that you post are my cup of tea man! More people need this type of automotive education because it honestly helps more than anything even with basic driving characteristics of daily drivers. I'm always looked at like I'm insane when I bring up suspension geometry and it's sad. Most people just want looks with little to no regard for safety and TRUE performance. Thank you so much for doing what you do and never ever stop!

[bonezfromga]

Jason I saw the mathematical composition on your board and I knew I was in trouble. You are too smart! Thank yoU!

[hasteau]

Thanks for the Video - One of your more difficult lessons. Ill re watch it a few times to get my head around it.

[nigelrafferty]

A very nice explanation of what and where is the roll center. I think it would be helpful to explain that the optimum roll center height is well below the CG for both handling and road holding reasons. Rougly speaking, if the roll center is about 1/3 of the way between the ground and CG, it cancels 1/3 of the roll. The anti roll bar cancels another 1/3 and the remaining 1/3 should be allowed to happen. This deserves another video!

[anabanana]

Thank you so much for taking a complex system and carefully explaining the components in an understandable way.

[RuiMeirelesPacheco]

Thank you Jason for another great video! It would be awesome if you could do an analysis of your Integra's suspension design. What the roll center is, what factors were behind some of the choices Honda made and how the basic design can be improved upon by regular enthusiasts (if it can at all). Thanks again for everything, love your channel!

[johnberumen]

Hey, just wanted to say thanks for the videos you helped me learn more about cars and in detail whit good explanations keep it going man !!

[pvultureb]

Man I love your videos. They make so much sense...

[NoorquackerInd]

I love these suspension design videos, it's overlooked so much and there's so much to learn from it

[RAVANANNTE]

Superb explanation man. Its very simple and easily understandable!!!

[marijaunnaz]

Thanks for these videos I used to be the most illerate in terms of how parts of a ride work but I'm starting to get it now

[OrangeFiero]

Great video, this is a complex topic and you explained it well.

[pedrammaelstorm]

And here's the question. we have the macpherson suspension. Normally we lower the car (front macpherson), as low as the tire size allows and the handling is improved as the result but in macpherson, the upper A-arm is the strut top and is fixed and has little to some mild angle. We lower the car, the lower A-arm is tilted downwards. It means if the angle of < is positive, turns toward zero, or even negative. The instantanious center is altered downwards. The biggest impact is noticeable on suspensions with short A-arms. The car that runs high has a jacking feel of one side. (body roll?) The same car lowered has great steering response, excellent cornering and fun to drive. So, on the contrary of what u'r saying, lowering the roll center helps until the jacking effect is minimized. I believe this is why we lower a car front 5 cm, but lowering the CG 5 cm doesn't seem to have a noticeable change. This is why lowering cars with solid axles or lifting them like offroad cars doesn't change things... I'm pretty much confused. with lowering the body roll decreases. but if we increase the moment length of body roll we will have more body roll.

[fordfiveohh]

Is it possible to predict whether independent suspension versus solid axle would have less roll.

Would you say that independent suspension was less role-prone?

I'm not sure if I can make that leap based on this example.

That's not a knock on you by the way.

[garimashama]

How can anyone dislike such a gr8 explanation ..if they dislike please upload their own video otherwise dont see it is not for them who dislike