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Old 05-02-2010, 04:02 PM #1
ccluff2
 
 
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The IPR mod - Walk Through

I would like to start by giving credit to StrangeBalla55 for the idea

and inspiration for this mod. Also I would like to say that there are

many ways to do this mod and this is simply my take on it.

On a stock shocker sft or nxt the solenoid tube's flow is limited by

the tiny hole that is found under the va.




The hole being that small does serve a purpose though, as it limits the

amount of air that can be stolen by the firing chamber during rapid firing.

The trade off to this

restrictor hole is that it also limits the flow into the solenoid. The

idea behind this mod is to creat a small check valve(1 way valve)

inside the left insert tube that will allow air to flow into the

soleniod chamer but not back out of it. This will in turn let you dill

out or enlarge the solenoid hole, which will give you more consistant

cycles at higher rates of fire. For this walk through I have chosen to

to keep the solenoid filter as that is not a choke point for the air

flow to the solenoid and it keeps the solenoid clean.


1) First you take the left solenoid insert out of your shocker and remove

the filter screen from the front of the insert.(Don't damage or distort

the screen when removing it.)




2) Now you need to make the valve seat. For this I went to ace hardware

and bought a .23 OD rubber well nut. It is basically a rubber tube with

a threaded brass insert inside. Once you have the rubber tube you need

to sand ot turn down the outside diameter by about .020"(with the final

OD being .210 )in order for it to fit good in the shocker insert tube.

Then cut the rubber tube in half right after the threaded brass insert

so you are left with a little piece as shown.




3) Next we need to make the piston. The od of the piston should be around

.185" and at least .4" from end to end(including taper). I went with a

golf tee as it was the correct OD and it was already correctly tapered

at the end. Optional: I put some shallow grooves down the side to help

flow a little. Just make sure not to go too deep, or cut into the

sealing face on the piston.




4)Now take a the remaining peice of golf tee and make a spacer to hold

the valve seat from sliding forward and shutting off the air.




You will also need either a very small and soft spring or a set of

small rare earth magnets(radio shack). If you are using magnets glue

them to the end of the piston and the solenoid filter so they are

opposing. I ground douwn the OD of the magnets slightly so they would

fit better in the insert tube.

This is what you should have so far.




5) Now you need a 6-32 threaded rod that is at least 10" long. I found

this at ace hardware as well. Next wrap tape around all but the last

.3" of threads so you dont scratch the body during installation.




6) You need to set the correct gap between the piston and the

solenoid filter by cutting the filter shorter until the spring or

magnet puts just enough pressure on the piston to keep it from shaking

around freely in the insert tube. Note that if you are using a spring

that you can also cut the spring shorter to help get the right tension.




7) Finally drill/mill out the solenoid hole on the body larger. You can drill extra holes like there are for the right insert tube, just be careful not to cut were the oring seals.

Installation-
Slide spacer thicker side up into the left solenoid tube. Then thread the valve seat onto the threaded rod and slide it into the left insert tube until it bottoms out against the spacer.





Now drop in the piston in the left insert tube.(followed by the spring if your using one). Lastly screw in the insert into the body to the right depth and you should be ready to rock.


This is what the completed ipr should look like outside of the body.



Disclaimer- This walkthrough is for informational purposes only, I am not responsible for messing up your shocker if you should attemp this and break something.
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Old 05-03-2010, 07:30 AM #2
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how's it working out for you
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Old 05-03-2010, 09:44 AM #3
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Those parts would make a nice set if machined But how is it working for ya?


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Old 05-03-2010, 12:51 PM #4
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I didn't have enough air to test at a high rof, just enough to air it up and fire a couple of times. The shocker in the pictures is a friends gun so the solenoid hole wasn't drilled out for more flow, and cs900 has both of my shockers in for modification so I'll have to wait till I get those back for full speed paint tests. I have done some testing with the shocker body I do have and the ipr seals off tight when I force air( with my shop compressor) back though the manifold solenoid hole.(sealing off the air chamber hole with my finger). The only concern I have is that the piston is laqured hardwood and over time this coating could wear off from repeated use possibly causing harm to the solenoid. What I wanted to use was delrin, but I don't have access to personal time on a lathe. I'm probably going to stop by the golf shop and see if I can pick up some plastic tees.
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Old 05-03-2010, 11:20 PM #5
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I never had a lathe for my stuff, I just locked a drill down with some clamps and put the delrin in the drill, and zip tie the trigger
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Old 05-13-2010, 10:30 AM #6
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and so does this mod help with efficiency, or is it just better airflow @ high rates of fire?
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Old 05-13-2010, 12:09 PM #7
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It cycles more consistently, and the reason for the check valve, is to reduce wastage at high rates of fire.
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Old 05-13-2010, 12:34 PM #8
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you know i could probalby make a ~free~ machined set for someone if they wanted to do an actual efficiency test.
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Old 05-13-2010, 01:17 PM #9
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Quote:
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you know i could probalby make a ~free~ machined set for someone if they wanted to do an actual efficiency test.
if i want to send me a set id have no problem doing an efficiency test..

nice work though
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Old 05-13-2010, 01:48 PM #10
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/\I'll pm you today or tomarrow. If you have access to a lathe and some round delrin stock it would be a very quick job to turn out a few for testing. You could even counter bore for the magnent to sit inside the piston so it would be flush with the face.

Back on topic

I don't think this mod will improve effiency, but I do think it will have a noticable affect on the consistancy of the gun at high rates of fire. On a stock shocker during sustained high bps the firing chamber can steal air from the left solenoid insert tube. When this happens the backup pressure in the solenoid reserve chamber releases in order to try to restore the left insert tube back to its correct operating pressure. This constat re/depressurizing of the solenoid insert tube is what leads to fluctuations in pressure, which will decrease consistancy as the gun does not cycle at the same pressure for every shot. what the ipr does is close off the air flow to the left solenoid insert when the gun attemps to steal its pressure under heavy fire. Then coupled with the stock solenoid reserve chamber and a enlarged left insert tube feed hole it should allow for a very consistant/high flowing pressure being fed to the solenoid at all times. Basically its intended to cut down on the pressure fluctuation in the left solenoid insert tube that is present in a stock shocker.
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Old 05-13-2010, 01:55 PM #11
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Neverthless, this seems to be a great mod once any and all kinks are worked out.
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Old 05-13-2010, 10:49 PM #12
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Quote:
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you know i could probalby make a ~free~ machined set for someone if they wanted to do an actual efficiency test.
woulda been nice 3 yrs ago
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Old 05-13-2010, 11:13 PM #13
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Ou know, if the air input was larger, then shouldn't you be able to run a lower dwell since air is supplied to the solenoid faster??? If that was so, then it actually would increase efficiency, but not by a large ammount.
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Old 05-14-2010, 02:33 AM #14
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if it was larger, it would not be more efficient due to volume increase
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Old 05-14-2010, 09:20 AM #15
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Increasing the flow rate INTO the solenoid wouldn't hurt efficiency. It would provide better airflow since the air isn't being choked before heading into the solenoid. That could increase efficiency since better airflow would be provided. Sorta like putting a mac noid in the ion... It provides better airflow. That's why I made that theoretical comment.
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Last edited by p3ngu!n : 05-14-2010 at 09:22 AM.
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