Shock Valving

Old 05-31-2007, 02:30 PM
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Default Shock Valving

I do not know if anyone knows what shock valving is but I wanted to know if this could help setup your cars better but it takes more time and knowledge to do it. I am a crew guy on a super late model in ARCA and this is how we setup our shocks. The only thing about valving your shocks is there are about 1000 diffrent combinations for one piston. When you valve a shock you can dtermine how much compression and rebound is in the shock. Here is a link to Ohlins shock manual to help better explain it.
http://www.ohlins.com/Portals/0/docu...s/07412-01.pdf
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Old 05-31-2007, 03:12 PM
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good link, we run ohlins on out dirt lm, i have been wanting to develop deflective disc shocks for r/c cars but havent had time..!!!!

alan
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Old 05-31-2007, 03:13 PM
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rccars use only numbers like 1,2, or 3 hole and the size of the hole. other then that theres no really "revalving" like with a car or moto.
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Old 05-31-2007, 03:30 PM
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I know about rc shocks I have raced for the past 7 years but I have just recently stopped doing it because of time and money. The thing wit ha rc shock is that you can not controll compression and rebound because you do not have a valve stack. On a rc shock you just have oil flowing through a piston with diffrent sized holes in it. So lets say that you are on a high bite smooth track with a normal rc shock. You cannot run alot of compression to get more bite you can just run what ever the piston can do. With a valved shock you can run a stiffer compression stack to get more bite. The other thing is that if you have your car setup perfectly then your rebound should equal your spring rate to help over come the force of the spring trying to unload itself. These are just a few advantages of a valved shock. I could go on for hours about it because there are so many thing to do.
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Old 05-31-2007, 03:54 PM
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tj google "RPM shock valve" they made a check valve piston that was independetly adjustable with the use of check valves
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Old 05-31-2007, 04:12 PM
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I have never seen those before but they still do not do what a valved shock will do. The reason for that is because with a valve stack you have 5-6 shim's, thse shim rest on a piston. The shims differ in thickness and in diameter. The shim that rests on the piston is the biggest and they decrease in diameter as you go up the stack. When oil flows through the piston it is going to put force on the base shim and when the oil has enough force it will open the valve stack. So if I had a thick set of shims the oil will have a hard time opening the valve stack, same with the rebound side. This eliminates changing oil in the shock becasue of the diffrent combinations of valve stacks and pistons. There is a picture on page 4 of the link that I put on here that shows how the valve stack and piston works. If you read page 4 it will explain very well.
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Old 05-31-2007, 06:09 PM
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I've seen guys do piston mods they called "valving" to get different compression and rebound rates on their offroad buggies. Basically all they did though was put a flap of vinyl or something over one hole of the piston. Thus during shock compression the flap would cut off oil travel through that hole, but during shock extension or rebound it would open up and let oil travel through both. I think their goal was to get quicker rebound without having to go to thinner oil making the car more predictable on a rough track while still handling the big jumps well.

I know... not the same. lol
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Old 05-31-2007, 06:09 PM
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Unfortunately, we don't have that type of shock. However, you may notice guys trying different bladders and foam inserts, o rings etc. in the bladder/top of the shock. That's pretty much how they are trying to influence rebound. It's not as precise as the full size stuff, but that's probably the best thing right now.
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