Join Date: Apr 2012
Location: San Diego
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Re: Absolute Strongest Axles For 900xp (Regardless of $$$)
They have been talking about using the 570 CV's with Summers Bros. axles on another UTV site for awhile. I think several of the desert race UTV's have been using this combo.
LET's TALK AXLES!
Here is the thing with axles and the UTV market. IMO they have not figured this out yet. Bigger is not always better! It seems like when you look at all the replacement axles companies you see Rhino, Gorilla, Cobra, Turner ect... But what I see is bigger & bigger axles which are much heavier, thicker, dont twist and are transferring the load somewhere else. Heavier & Thicker doesn't mean better! Better material, better engineering means better!
There is a balancing act with improving a part or over building a part. We all want our vehicles to be bullet proof, but when you strengthen one part you have now shifted the weak link somewhere else. Trophy Truck & Class 1 builders have been chasing this for years, they kept building bigger to be stronger, but they in turn have added huge amounts of weight, which has not necessarily made the vehicles stronger & worker better. If you look in the past few years you are seeing lighter vehicles built as they are finding a lighter more nimble vehicle is also not as hard on the equipment.
Also when you build a bigger, thicker axle you are taking the twist out of the axle. In theory you would want to take the twist out of the axle, as this is what is snapping the axle. But factually a well engineered axle should be able to twist like a torsion bar. By allowing the axle to torsionaly twist you are absorbing the shock load to the CV's and driveline components.
This is why Summers Brother probably makes the best axles in the UTV industry. They have been around for a long time in motorsports and they understand this. Sway-A-Way, maker of torsion bars, sway bars & axles is a huge believer of torsional axles, and they to have been doing this in the motorsports industry for longer then the the word UTV has been around. How long have these UTV axle builders been around? Are they just taking car parts and adapting them to UTV's? I would like to see Sway-A-Way enter the UTV market. I think they could build an affordable alternative to these bigger axles.
The secret is balancing diameter vs material and manufacturing process to make the best axle possible. Just machining a axle out of steel and making it 50% bigger does not make it better. All it has done is make the axle much heavier, more rigid and that shock load is now transferred to the next weakest link, dif & cv's. I think this is why you hear and see so many dif failures. How many of those with dif failures have bigger axles and big mud bogging tires? I agree the stock XP axles are weak. But its not necessarily the size, as much as its the poor quality material used and the process being used to make those axles.
IMO the ideal axle would be 15-20% larger in diameter, made of 300M material, heat treated to be torsional and gun drilled to reduce the weight, and by doing so would be as close to stock weight if not lighter.
So bottom line IMO right now I would think the best package is going to be the Summers Bros axles with the 570 cv joints. But don't take my word for it, do some homework and call these axles manufactures. Ask about torsional twist.
Last edited by NIKAL; August 13th, 2013 at 09:45 AM.