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Old 11-10-2012, 06:24 PM   #1 (permalink)

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Default Monroe Air-max reservoirs?

So I took Lug-nuts post on how he made his reservoirs for his Monroes and went ahead to make some for mine.

The monroes worked great as is but I wanted to eliminate the 1-2 hose connections. I could have just made individual schraders but figured I make a reservoir for them since Im at it already.

Problem:
When they were connected to the 1-2 hose line, the happy PSI for the buggy was 120lbs.
I made one reservoir to test out before I started on the second one.
I remounted it and put in 120psi Nitrogen. Barely even lifted up the shock.
I bumped up the PSI to 150 and it lifted that side about another 1/2".
I then jacked up the front end to extend the shock and take weight off it, filled back up to 160psi and it stayed up, but as soon as I put weight on it,i could push it down to the floor again.

There are no leaks, I used Lugs trick of Kwik JB Weld on the threads that had leaked when I first tested and they seemed to be holding.

Does adding the reservoir mean I can now pass the Rated 150 psi Max pressure?
I just dont want to blow the bag!
If I had the cash on Id just by some king air shocks but I dont have the luxury right now.

Does adding the reservoir mean that I can pass the Rated 15psi Max Pressure
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Old 11-10-2012, 07:06 PM   #2 (permalink)

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Default Re: Monroe Air-max reservoirs?

Boyle's law: pV=K.

In this case we can interpret K as your effective spring rate. You've increased the Volume of the system so the Pressure will also need to be increased. The shock was rated at 150psi so that when fully compressed the pressure would not exceed the bag's rating (which will be much higher than 150psi). Now that the volume is larger the pressure increase will not be as dramatic as before and will be under the limits of the shock.

With the reservoir attached your static volume (volume left when the shock is completely compressed) is much larger and the spring rate will be less progressive than before. This will also cause the new pressure to be much higher than before to maintain the spring rate.

If you fill the shock so it performs similar to stock, you will still be within the operating pressures of the shock.
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Old 11-10-2012, 07:10 PM   #3 (permalink)

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Default Re: Monroe Air-max reservoirs?

The air will follow the path of least resistance.

When the shock has pressure on it by it self. It's fine.
But add a accumulator. (Which is basically what you have now... Like hydrolics) it will push out the shock and fill the tank you made.
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Old 11-10-2012, 07:27 PM   #4 (permalink)

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Default Re: Monroe Air-max reservoirs?

Great thanks guys.

I read a few other threads of these guys usi.g the air shocks with built reservoirs and they are using in the 100psi range. Not sure how theirs are working with such a low PSI and reservoirs

So in my case, if 120 worked great with original setup, then I could potentially fill it up to 200 or what ever rate to finding the similar riding height and I will still be okay?
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Old 11-10-2012, 07:30 PM   #5 (permalink)

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Default Re: Monroe Air-max reservoirs?

With the nitrogen tank i have 1000lbs of PSI right now so filling them to 200 is not a problem compared to using a compressor.
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