Many folks have seen this pic-



Someone always digs it up when someone recommends that a hockey puck be used as a seat riser.

Then someone said I did it wrong because the washer didn't have the same surface area as the bottom of the seat base, so I got another puck and did this with it and it's the correct surface area with the correct torque value (IIRC) and I measured the squish each 5 or 10 pounds of torque squashed the puck.




Afterwards, I just tossed it over to the side here in the office and happened to glance over at it the other day and noticed a small change in things. After seeing this, I'm even more convinced (as if that was possible) that I want nothing with these properties any where near anything that holds my seat in place.

Who is gonna argue this? i got an idea.... Try this with a poly spacer if you have one laying around

Interesting, very interesting.

I just wanted to keep the rofl train going. Whoever thinks they can use hockey pucks for seat risers/body lift is short of an idiot.

Ya I wouldn't use them on my friggin seats, might as well use marshmallows! I will stick with my Buchanan risers and feel safe all day long, sure they cost money, but well worth it!!

P.S. nice right up Mrblaine.... maybe people will wake up and smell the coffee???

shoot ... and was just going to use a hockey puck as bump stop spacer in the front. Thanks mrblaine!
(I hope this is not off topic as your title does not exclude this application of hpckey pucks )

Does anyone have nice pics of crushed hockey puck bump stops?

I ordered 4 1" mini blocks from Performance Accessories 1" MINI BLOCK Hopefully they work ok? For $.99 it's worth a shot.

Let me know how this works out.

They work fine,I used them for years.They are hard nylon blocks just like the seat risers that come in a kit.Hockey pucks are for hockey.

As long as you use something that doesn't squish the puck to hold it down, I see no reason not to use them for bumpstop extensions.

dang, i didnt think a hockey puck would squish that much. along those lines though, i wouldnt think a golf ball would smash in as much as they do. so it makes sense

This test is flawed, that's a Slovakian puck! A genuine Canadian puck would be fine...

I agree...definitely wouldn't use hockey pucks for seat risers...EVER. the phenomena you've shown here is called Hyper-elasticity. This type of rubber would apply to the "Mooney-Rivlin" model.

Basically the idea is rubber changes shape over time, as stress is applied. Rubber is a time dependent material - the rate which force/stress is applied over it matters. Aluminum and steel are NOT time dependent. That means the amount of time it takes to compress/apply force matters greatly. Temperature also makes a huge difference. For you DIY seat riser guys - every polymer is time dependent and non-linear....the ranges where this is important does change obviously, but this is still a defining characteristic of anything plastic or rubber (polymers).

What you've shown by compressing the rubber, is over a relatively long period of time (several seconds to minutes), the material acts in a highly non-linear manner, with large deformation. Deformation is the change in length/height/width in this case.

And after you've compressed the puck with 10 ft-lbs or whatever, if you leave it sit for 2 days, there will be no more torque on the bolt. Probably more like a few minutes, but you get the idea. Thats call Stress Relaxation. The stress induced by the compression is dissipated by the "Stress Relaxation" phenomena.

When you mount your seat to something, you definitely do not want non-linear behavior! You want solid, linear behavior like aluminum or steel!

Here's all the technical babel from "Applied Mechanics of Solids" by Bower - Applied Mechanics of Solids (A.F. Bower) Chapter 3: Constitutive laws - 3.5 Hyperelasticity

I agree. the rate which the bumpstop cup will hit will be rather quick (milliseconds), it might indent slightly, but shouldn't damage the cup or the rubber much, plus the stock jounce bumper is much softer than the rubber in a puck. Assuming pad mounting here...not as spacers between cup and mount.

The next big thing from Smittybilt...

This is why I recommend RC body lift/t-case drop spacers to be used as seat risers. They fit the application quite nicely.