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  1. kritter

    Nitrile Failing in Hydraulic Oil

    It swells and breaks up. Failure looks identical to rubber submerged in oil that is agitated...nothing but pieces/chunks left and the oil is compleltly contaminated/black. The cushion sees a compression loading of roughly 2000lbs everytime the tire unloads.
  2. kritter

    Nitrile Failing in Hydraulic Oil

    I am using a die cut nitrile bumper .25" thick inside of a shock absorber for an internal extension cushion. Some have failed some have not. When the part does fail its catastrophic destroying all the internals of the shock absorber due to contamination which plugs the ports, bends/breaks shims...
  3. kritter

    Piston Rod Material for Extreme Abuse

    Greg: Where would I find such sources. I came here to ask since I couldnt find much OEM data available.
  4. kritter

    Piston Rod Material for Extreme Abuse

    ford backed stock vehicle other then tires, shocks and added safety equipment. http://videos.desertracing.com/videos/2003/v2r/wmv/93.wmv
  5. kritter

    Piston Rod Material for Extreme Abuse

    Greg ford stated that 1000 miles offroad racing is equivalent to 100,000 or 1,000,000 I cant remember which and that is why they have an offroad race program for stock vehicles...cheap R&D. They give a few free vehicles away every yea that are bare bone and supply OEM parts to the teams...pay...
  6. kritter

    Piston Rod Material for Extreme Abuse

    Delphi is the only tip I have got. These are not your everyday shock absorbers. 3" rocks coming off the front tires bashing into anything in its way rearward means stuff has to be hard. OEM would be a good start, but any engineer at an OEM designing shafts to hold up to the abuse desert racing...
  7. kritter

    Piston Rod Material for Extreme Abuse

    People dont always use them or they fall off or rip off...either way, its a failed shock which can cost a race. 100mph through the desert terrain does wonders to equipment.
  8. kritter

    Piston Rod Material for Extreme Abuse

    If money was no option what would be the shaft of all shafts to resist sand blasting, rock dings, and general abuse suffered in an offroad application? If money was important in the same application what would you choose and why? Currently for street applications the material is: 1045/1050...
  9. kritter

    Rubber Snubber

    I need to have made a rubber bumper for a shock absorber in a race application and I have very limited knowledge of what type of rubber I need to call out. The only loads this bumper will see is compressive loads. It is going to be .375 tall, 2.875 OD with a 1.25 hole in the center. I would like...
  10. kritter

    12V Hydrostatic Pump

    Although electric steering would be the way to go a la Delphi on the GM rear steer. Time is not on my side to design/educate myself on an electric steer.
  11. kritter

    12V Hydrostatic Pump

    CCW...I havent gotten a straight answer on pressure. I took an educated guess at 1000-1500 psi. I found a pump from Haldex but at 1500psi it doesnt supply enough flow. They specialize in hydrostatic pumps and control valves but mostly 24 volts and up. The car cannot be plumbed off the motor as...
  12. kritter

    12V Hydrostatic Pump

    I have been given the task to source a 12V hydraulic pump that will generate 5GPM flow and be able to withstand the ruggedness of off road racing. I dont deal with pumps so I figured I would come here and ask on some recomendations for quality pump brands as well as a place I might go to find...
  13. kritter

    4-12 Acme thread issues

    Ive got a 4-12 acme threaded steel can. A collar and a lock nut are machined out of aluminum and screw on to the steel can. The steel is electroless nickel plated .0008" thickness. The aluminum is andoized and is brought back to net. We discussed with the machine shop to decrease the thread...
  14. kritter

    1006 vs 1010 vs 1016 HRPO

    Edges are all broken and pre heating is not an issue. AS far as with the grain or against the grain I couldnt tell you since I dont have anything to do with that department... I was asked what to use, I said 1006 since it is most formable. I wanted more opinions from people who use these...
  15. kritter

    1006 vs 1010 vs 1016 HRPO

    my mistake...it is coil. I call it plate since for R&D work I use plate whereas for production we use coil... there is no issue with coil memory at this time...only with stress cracking during bending.
  16. kritter

    1006 vs 1010 vs 1016 HRPO

    What would you choose and why for a .25 inch HRPO plate with a 2 inch wide bottow die bending 90 degrees + for fabricated structural components? They have to be nice to cut on the laser cutter as well as nice to bend without cracks forming? If I order material straight from the mill can...
  17. kritter

    Oil and elements

    I ask becuase I sent out a few oil samples for analysis and they came back with varying amounts of those elements and I havent been able to get an explanation as to what those elements do or how those elements improve the oil.
  18. kritter

    Cavitation/Foaming Vs Viscosity

    It is a monotube shock that has the oil and nitrogen seperated by a dividing piston...not an emulsion shock which has the oil and nitrogen mixed. I can foam/cavitate shocks that have been air bled, all day long on the dyno after only a few thousand cycles... You say that viscosity and boiling...
  19. kritter

    Cavitation/Foaming Vs Viscosity

    Can anyone enlighten me with a text or website or experience that will give me a correlation between viscosity of an oil and cavitation in a hydraulic system? This is for a monotube shock absorber application and I am trying to determine the best viscosity oil to use of the 5 most widely used...
  20. kritter

    Oil and elements

    What benefits do these additives add to a hydraulic oil? phosphourus zinc calcium silicon I assume it helps seals and o-rings but I dont know that for a fact. Thanks, Kris

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