%% Valve location Myth ...Solved! %%

now what about trucks riding better with the valves at the tank. because there is more air capasity since the line adds to the volume of the bag.

how would you test this myth?

Originally posted by Psycopath



now what about trucks riding better with the valves at the tank. because there is more air capasity since the line adds to the volume of the bag.

how would you test this myth?

mythbusters did something like that. it was to test if driving fast over bumps was a better ride.

Ok to help answer a few questions.

About control.

I have a small 12V digital timer I set it to 500 micro sec. it is a single pole double throw relay on board so when closed the dump is off and the fill is open, when open the dump is on and the fill is off.

This takes the human error out of it The valves are also run off a regulated 13.5VDC wall power supply.

About the Chain,

I did the tests 3X times each and found the results to be the exact same so no need to repeat them more (there was not even a need to average the measurements)

My digital camera is only 25 frames per sec ( I know my high speed ..1,000fps works but I have no way to digitally capture the results)

You will have to trust me in both they are at the highest point of travel with the chain tight.

About the Myth.Here is the base of the myth.

If you have your valves on the tank or on the bag the speed of the air through the system is the exact same fact! once open the air goes through the same passage.

But here is the kicker when you move the valve to the bag the air now has less distance to travel for only one 1/100th of a sec this slight extra kick will apply more energy to the same mass in less time so hence more acceleration.

Think of the line now as a capacitor or accumulator that extra 10 feet of 5/8" line is almost 1/2 gal of air that it has close to the bag.

For repeat hopping this is even more crucial for when you dump the air you need it out fast when on the tank it has to force the air back up through the line and out. but when on the bag it is a simple bend to get out.

so what I am getting at is on a small 1/4" line system you will never notice the difference but as systems speeds increase the

difference will become more dramatic.

This brings me to ride quality.

Most have noticed valves on tank give you a better ride.

Here is why,

like I said before 15feet of 5/8" line is almost 1/2 gal that is the volume of a 2600bag.

an air spring is a spring with a variable spring rate when you hit a bump the bag will compress the air inside has no place to go so the pressure will increase, as the pressure increases the spring rate will clime and will 'stiffen' the ride.

so for a little math.

Lets say you hit a pot hole that will compress you bag from 0.5 gal (8") to (0.25gal) (4")

with valves on tank 15 feet of 5/8" line you would have the bag pressure go from 100PSI to 133.33PSINow valves on the bag same system your pressure would go from 100PSi to 200PSI

Now you can see why the ride will 'stiffen' up with the valve closer to the bag

any questions post away I am happy to explain anything further.

Even if some of this stuff tends to be more common knowledge, its cool to see numbers being put to it and such. Thanks for doing the research if nothing else than for a good read.

i wish i had this much time...

thanks alot now my brain hurts, good info though

Originally posted by 3In2Out



Even if some of this stuff tends to be more common knowledge, its cool to see numbers being put to it and such. Thanks for doing the research if nothing else than for a good read.

Not a problem happy to help.

I may do a video of this soon.