believe me, before you jump on a shifter kart that is capabale of 135 mph and race it wheel to wheel with 20 other guys, you do some research on your safety gear. the governing association makes our standards for our safety equipment yearly, and even go as far as checking it ever single race during the techinical safety inspection of your kart.
How did you go about doing your research? Did you just accept that good enough for Snell=good enough for you or did you actually go to the trouble and expense of destroying a bunch of different helmets under circumstances simulating actual crashes in seeing which ones delivered the least amount of energy to the head? I'm not saying that Snell rated helmets aren't good helmets in lots of ways. The top of the line helmets sold in the US are all Snell rated and that is exactly because of people thinking along the same lines as you. The makers know that becuase of the aura surrounding the Snell rating in the US consumers won't buy their helmets at a premium price unless the little sticker was there.
if snell rated helmets, in which they have a motorcycle rating for guess what, motorcycle helmets, is too hard, then explain to me that if you drop it, why does the inner liner get damaged?
One has nothing to do with the other.
and for motorsports, take nascar for example(or a fully enclosed car), the impact for which helmet is rated (motorsports) would not be as severe (generally speaking) as coming off of a motorcycle at 150mph and letting your head break your fall.
According to all the studies done on motorcycle accidents, the severity of the impact actually has almost nothing to do with the speed the bike is traveling at the time of the accident. There are two component vectors invloved and the pavement that your head hits the vast majority of the time is only countering one of those vectors: the gravity vector. The impact only has to do with how much of your velocity is headed straight down. That is dictated by how high you were when you started to fall, not how fast you were traveling horizontally. Most any helmet will do a great job of protecting your cranium from road rash since that is a purely abrasive type injury. Combine that with the fact that in the 3 major scientific studies conducted world-wide the average accident speed was on the order of 25 MPH. If you hit a solid object head on at much of any speed, no helmet in the world is going to save you because you will still die from severe injury to the rest of your body, so why test a motorcycle helmet using an impact of that severity? That is what the Snell standard does. Not only that, the allowable force transmitted to the head is an arbitrary figure that is WAY beyond the threshold of injury.
http://www.helmets.org/whatneed.htm
That is a much more informative read than the SMF website.
"There is a second thread in the seemingly endless discussion of g thresholds: concussion. The vast majority of consumers assume that a helmet should prevent concussion in even the heaviest hits, and that if the helmet protects against severe blows it must surely be easily protective in lesser ones. But in fact the helmets built to our standards are in many cases too hard to protect against a mild concussion in either a low speed hit where foam fails to crush or a much harder hit where clinically evident permanent injury is avoided, but a lesser concussion still results even though the helmet has not crushed completely and bottomed out."
That's an excert from that site that states exactly what I've been saying and you've been arguing against. Several studies have defined the vastly ovewhelming majority of motorcycle crashes as a low speed impacts putting the above into context. If you are going to wear protective gear to mitigate inury in the event of a mishap, why focus your protection around a type accident that is a statistical anomoly at the expense of a the type most likely to occur? The Snell standard only considers the anomoly.
I'm not talking about your race gear. And one type helmet does not fit all applications.
BTW, I found a link to the article I mentioned earlier.
http://www.motorcyclistonline.com/gearbox/motorcycle_helmet_review/
Looks like advertised fueled propaganda to me //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif