Greg Boardman said:
I just happened to do a little research myself. Here are a few facts about the differences between the two shock manufacturers.
If Sway away were better, don't you think KORE would be using them too?
Fox - 17-4 stainless shafts
SAW - plated steel
Fox - U. S. made Aurora Heims
SAW - Chinese
Fox - Body is Cadmium plated
SAW - high nickel - rust bucket - be sure to clear coat them.
Fox - seal compound came from snow-mobile tech
SAW - old-school Viton and urethane - oil leaks out as temp drops (beware if you buy these and live in a cold climate)
In order to fit the Sway away shocks in to tight places they ignore primary rules of hydraulics- Like Piston Overlap- That's why they're known for leaking and require maintenance on seal failures.
Greg DRC
Dude, take it easy. I didn't say, or even imply for that matter, that one product was better than the other. All I was saying is that from everything I looked at I thought they were quite comparable, and I still stand by that.
Fox 17-4, this is some great metal, gets used in lots of aggressive applications where strength and corrosion resistance are needed along with good weldability, but it all depends on the design approach that the manufacturer (in this case Swayaway) takes. 17-4 also has pretty poor hardness 33-40 Rockwell C for most hardness conditions (see
www.matweb.com), where most chrome platings on steels go 60-70 Rockwell C and as a result will resist scratching of the shaft better. The shocks on my mountain bike were nitrided (even harder than chrome typically) and they are well scratched from the mud and won't hold the best seal any more. So you see it is really a matter of trade offs, like most things are, including Desert racing a diesel truck.
Heim joints, I was referring to the specific design, i. e. teflon lined, I wasn't able to confirm their country of manufacture, but no problem just because they are from China doesn't mean they are crap. Heck a lot, and I mean a lot, of the 17-4 steel comes from China to begin with.
Cadmium plating is also pretty darned good stuff, poisonous and being phased out in most industrial applications, but it is a great anti-corrosion protection, one of the best, used on bolts lots too because of its fairly high natural lubricity. But your statement about nickel being a rust bucket, in this case, is total, complete, utter BS (I don't like to be mean spirited, but your description was pretty no-holds-barred as well). From what I have learned they are using electroless nickel, here is a link that you and other TDR members can read
http://www.corrosion-doctors.org/MetalCoatings/Electroless.htm They use words like "exceptional corrosion resistance" "High Wear Resistance", no mention of "rust bucket". I will look for some ASTM test data, but I will hazard a guess that EN gets a 9 out of ten in the standard saline water baths, while Cadmium gets maybe a 9. 2 out of ten comparatively. You were likely remembering the old school nickel plating stuff that flaked off, that stuff was/is junk.
As to the seals I will definitely watch out for this as I live in Canada and it is pretty friggin' cold up here right now, but again I am willing to take the chance that the problems you are referring to are probably quite minor, if they exist at all on a regular basis. Does the oil leak out catastrophically or only a drop or two here and there, does it immediately render the shock useless causing me to crash my truck or will I just eventually have to "top them up" like I do when I service my mountain bike shocks every season. Just trying to get a perspective one how big a problem I might have. If they use snowmobile compunds which would presumably be optimized for freezing temperatures, how do they handle the heat in desert racing?
Like most designs I suspect that Swayaway make choices that are compromises between a whole bunch of parameters and they have decided that they will go with a shorter overall package and perhaps this might mean compromising on the hydraulics, though I doubt they "ignored the primary rules". You make it sound like they won't actually work. I spent over 1/2 hour on the phone talking with the engineers at Swayaway and I think they are a pretty knowledgeable bunch of fellows really, more than willing to discuss the technical stuff if you ask them. I will be sure to follow up on this with them since I am getting a pair of these shocks.
Again I believe that there are some pretty good components out there from the various vendors and everyone has their small twist, but in the end it is mostly splitting hairs. Again to use my motorcycle analogy no matter which bike you buy Kawi', Suzuk', Honda, Yamaha, you are getting a pretty kick butt machine that, given equally competent drivers, will perform within a hair of each other (they are all Asian made to boot). Then you get a bike like Ducati, which has some very diffrent design features (V-twin with rotary valves vs. 4 cylinders standard valves) but the real world performance gap is small to non-existant. That is the point I was trying politely to make.
And you can hardly blame Sean for not giving you a free suspension set, they are a little expensive. But tell you what, I was thinking of a neat test where we would bolt one of Sean's shock towers to a big piece of channel, then bolt any one of his competitors to the other side of the channel, then use a hydraulic pullback ram hooking the two together and see whose fails first. Sort of like a shock tower shoot out, not unlike the old dodge vs. ford pull off. So how about you send me a set of his competitors towers (for free of course) and I will conduct the test (as an impartial third party of course) and video tape it for evereyone to see. I honestly don't know what the outcome would be but it would be fun to try it out, what do you say?
Jonathan