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Volkl AC4 PCOS

post #1 of 11
Thread Starter 
Anybody have experience about the different characteristics of the AC4 with and without the PCOS system? I have last year's 177's and am considering taking off the PCOS to make the skiis a bit friendlier in bumps. Gains/Losses?
post #2 of 11
I wouldn't expect the PCOS to greatly change the ski in bumps. The piston dampens rebound from decambered back to neutral and is especially active in very short quick occilations, which is why it reduces ski chatter at speed. I have skied with and without pistons and felt the difference was pretty subtle and mainly helped quiet the ski on very fast groomed runs.

Its not too hard to remove the PCOS and you will have one screw hole per ski to plug. Try it, and if you decide you like the piston better, just drill the plug and reinstall.
post #3 of 11
I agree with Cirque. Taking off the PCOS isn't gonna make the ski any less forgiving in the bumps. I have a pair of this years with the PCOS, like Crique said the differences are subtle. People have the common misconception that PCOS makes the ski stiffer, this is not the case, it does not stiffen the ski whatsoever. It works like a shock absorber on your car. The spring absorbs the bump and the shock slows the rebound.
post #4 of 11
I messed up a bit. There are two screws. One at the end of the piston arm and a screw with a large flat head that lets the piston arm slide. FWIW, I really advise against removal. Chances are you don't have the plug that replaces the space occupied by the piston, and that would allow snow and ice to accumulate under moving components of the bindng toe.
post #5 of 11
I have last years 177 AC4 with the PCOS also. A local shop guy told me that he thought the piston caused the ski to have more tip dive in deeper powder. I have never tried it without the piston, but does this sound feasable at all?
post #6 of 11
Thread Starter 
Thanks for the input. Don't like the idea of compromising the binding for what sounds like minimal or no gain. I very much like how damp and stable the ski is at speed and wouldn't like to give that up. As far as powder is concerned, haven't been in deep stuff with the AC4 yet but have been in lots of crud, windblown bumps, trees and love the way it's basically a point it anywhere and go ski.
post #7 of 11
No Cirque you were right the first time, there is just the one screw. The other end hooks under the toe piece. I'm talking on the 07 AC4, I haven't seen the PCOS set up on last years model.

NYSki I don't think it would cause the ski tip to dive in deeper stuff. If you look at how it works you will see it takes next to nothing for force to make the piston push in (get shorter) but considerably more force to pull it back out. This eliminates some of the chatter when trying to hold an edge on hard pack. I can't see how it could make any difference in pow.
post #8 of 11

Agreed

For someone who only gets about 30 days a year in, I'm not sure if I qualify to add to this thread, but I would have to agree, that the piston does not make this ski any better, or worse in the bumps. And I don't know how any "shop" guy would say the piston makes the ski "dive" in pow. Dive may be the wrong term. Float might be a better term, but again, it's not due to the piston. And speed also becomes a major factor of float.

Flex an unmounted AC-4 and then do the same w/one mounted. any noticable difference? Nope.

I have the 07 AC-4T's in a 177 and haven't really found this ski to be fantastic in the bumps, just as all the testers in all of the reviews. But man, at speed, does this ski ski or what!! That's when the pistons shine. Marker and Volkl did a ton of research in this setup, so I would be curious as to your findings if you remove the pistons. But my feel is that the AC4 is simply not soft enough to be considered a good ski for the bumps unless you are awesomly powerful.
post #9 of 11
i haven't tried this years version of the AC4, and I know they stiffened it this year, but from all the reviews I am reading about being really tough in the bumps, they must have really stiffened the shovel this year. Last years ski is actually quite capable in (non-rock hard) bumps and I am far from a pro level bumper. But I agree about the piston. It really didn't make much sense that a rebound piston would cause tip dive in pow.
post #10 of 11

Bumps on 170 cm

I ski the AC4 2007 with the piston and although I am old ( 68) and slow I love the way they handle in the bumps. Like the P9 s of 10 or 15 years ago one can ski ( carve) the tips and the tails in the bumps. I am 6' and weigh 185. You might want to try some shorter AC4's. I only have one pair of skis these days and these are wonderful. I have only had two days of Powder on them in my twenty days this year and they are not great floaters so if I get lucky on some powder I will rent some fat boys.

Hang in there, it gets better every year ( I started in 1947)
post #11 of 11

Bumps on 170 cm

I ski the AC4 2007 with the piston and although I am old ( 68) and slow I love the way they handle in the bumps. Like the P9 s of 10 or 15 years ago one can ski ( carve) the tips and the tails in the bumps. I am 6' and weigh 185. You might want to try some shorter AC4's. I only have one pair of skis these days and these are wonderful. I have only had two days of Powder on them in my twenty days this year and they are not great floaters so if I get lucky on some powder I will rent some fat boys.

Hang in there, it gets better every year ( I started in 1947) Ski Bum and proud of it.
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