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I wasn't aware of this drag car tire phenomenon


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#1 Phil Smith

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Posted 01 June 2022 - 07:37 PM

A buddy just sent this to me. Pretty crazy that the tires hold together.

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#2 Phil Smith

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Posted 01 June 2022 - 09:29 PM

I don't know how I've missed this. I've watched plenty of drag races on TV and never noticed it in slomo replays. You can see it on the back of the tire in this video.

 

https://youtu.be/HyhW-6629UA?t=49

 

And this:

 

http://forums.pelica...718-post24.html


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#3 Tom Katsanis

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Posted 02 June 2022 - 12:05 AM

I knew about the rear tires expanding I could be wrong but I believe they get a bit more mph on the top end from the expansion.

#4 NSwanberg

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Posted 02 June 2022 - 02:42 AM

"Wrinkle Wall" slicks are now specifically designed for the special requirements of drag racing, being constructed in such a way as to allow the sidewall to be twisted by the torque applied at launch, softening the initial start and thus reducing the chances of breaking traction.


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#5 Bill Breck

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Posted 02 June 2022 - 05:14 PM

Nice video that explains the different forces acting on the slicks.

 



#6 Phil Smith

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Posted 02 June 2022 - 07:32 PM

I already knew about the squatting, wrinkling and the expanding. I didn't know about the tire warping / distorting at high speed. Bill's video shows it, as well the links in my posts.

 

This shows the back of the tire at speed in Bill's video: https://youtu.be/6N8NXpvHWW0?t=71


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#7 Eddie Fleming

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Posted 03 June 2022 - 08:41 AM

Is the first photo the same as the distortion the videos are talking about, or what i have heard called tire shake or something like that when the tires break traction at the start and go all goofy?


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#8 gotboostedvr6

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Posted 03 June 2022 - 09:57 AM

Am I looking at Individual cylinder Ignition shockwaves in those tires?
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#9 Dave Crevie

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Posted 03 June 2022 - 11:26 AM

Wrinkle walls came to prominence in the late sixties. Back then we used sheet metal screws through the rims into the tire bead to hold them on, since we ran them as low as 5 pounds of air pressure, which wasn't enough to keep the seal. And yes, tire shake comes from an occillation caused when a tire begins to bounce on the track. Also, the tire increases greatly in outer diameter due to centrifcal force, which gives more speed in the traps. The same thing happens with slot car dragsters when soft tires are used.   


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