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Old 11-28-2005, 10:29 PM #1
Eric the Great
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Bushmaster Ram Mod - Taking your ram further

This is for those of you trying to take your stock ram as far as it will go. It slightly reduces the cycling mass of the shaft and reduces the air volume needed to push the ram forward, yeilding lower lpr pressures.


Directions:

Remove the stock spring bumper and guide.

Remove your hammer from the ram shaft, this may require heating it
Put the ram shaft in a vise, cut the spring guide off of it carefully
flat file the end of the shaft till it is flat again.
If you care you can sand paper and polish the end, but it dosent rub anything so its not extremely important.

Take some 17/64(little bigger or smaller dosent matter the orings will seal it up) aluminum rod stock insert it in the ram cap mark the rod so you can cut it off.
Remove the rod from the cap, cut the rod.
Drop it into the cap it should be flat with the top, if not then file it down till it is.
Next you need to mill oring grooves in the rod, the best way that i have found to do this is with a drill and hack saw. That is unless you have a lathe.

Install the rod into a drill or drillpress. You want the grooves towards one side with one being close to the end.
Turn on the drill set the hack saw blade on the rod, move the blade back and forth a little, a groove will start to form. once it is deep enough you may need to widen it with a file.
Clean the devolumizer and install the orings. Test it in the back. It should be hard to push into the back, so that it will seal off the air and hold it firmly in the back cap.
Take a peice of sewing thread about 4in long apply grease to 1in of the end, just a real light coating. Set the greased end itno the ram cap, leaving the excess to hang out. Push the devolumizer in to the ram cap with the orings closer to the opening. Carefully pull out the thread.
YOU WILL HAVE TO USE A RAM BUMPER WITH THIS MOD, or you will risk damaging your ram housing or body.



Im using a ported housing and a lightened hammer. My setup is running at 180hpr/60lpr at 8ms dwell. This mod combined with the housing porting allowed me to drop my lpr pressure about 10-15 psi and my dwell from 12ms to 8ms.

cautionary quote from GDP
Quote:
Originally Posted by Goldie D Pimp
Ok guys.

I really don't know how to say this without sounding like a pain.

I'm all about modifying things and doing stuff like this.

HOWEVER YOU HAVE TO BE CAPABLE OF DOING SO!

Doing this mod is very dangerous to the health of your gun if done improperly.


If holes are drilled improperly they can cause leaks.

If burs are not removed from the holes properly they can cause cut orings and wear in the ram.

If you do not remove every little tiny metal shaving no matter how tiny, it can easily work it's way down into the solenoid and ruin it.

If you don't take it apart incorrectly you'll scratch your ram shaft and cause leaks and more of those lovely metal shavings I've been talking about.

If done improperly you're looking at around:
$25 for a new ram shaft and hammer.
$60ish for an entire new ram housing and assembly
$60-100 for a solenoid

When you do this mod you are working with THE two most expensive pieces to replace on your bushy aside from the body. So take this into consideration when doing this.

This also voids your warranty in the biggest way possible. So if you do this mod and then something else goes wrong, then you're going to end up paying full price to have it repaired.

I don't mean to sound like a downer, but during the past month or so, I've had more rams come in for repair than I've had in the past 5 years. Most of which have had problems from doing this modification.

ALL of which I had to charge for repair, and nearly all threw a fit and got angry when they got the bill for the repairs.

If you do this, you do it at your own risk and if you mess anything up, then you're going to pay for it.
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Last edited by Eric the Great : 07-07-2006 at 12:39 AM.
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Old 11-28-2005, 10:41 PM #2
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nice faq, STICKY!!!!


how much has your efficiency increased?


and since you seem to have the time and resources how about a polising FAQ?
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Old 11-29-2005, 01:36 AM #3
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Nice Write up, I just did mine, I used the Ram spring that was in the ram cap, And i made a small lot for an O ring, Its in there pretty good now.


one question, why do you have to use a Ram bumper?
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Old 11-29-2005, 01:42 AM #4
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the little oring in the back cap acts as a bumper. when you remove it the ram will either bottom out on the back cap of the ram, on the front of the ram housing, or on the back of the bolt slot on the top of the body.

be careful using the stock spring guide as a devolumizer for the back cap, you dont want that to fly out durring firing and have it lodge in you ram.
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Last edited by Eric the Great : 11-29-2005 at 01:44 AM.
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Old 11-29-2005, 02:01 AM #5
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I put something that looks like a Reg set in there, I think the ram cap will be fine. I also put 2 o-rings on the Spring guide, I did it pretty easily with the cutting wheel on the dremel, i'll take pics and update in a sec.

Edit -

The clear reg seat thing is what i put behind the devolmuizer, Not the best picture but gives you an idea of what i did.





Edit 2 - Oh and i Also would like a How to on polishing the inside of the ram housing. I just put a 3rd O ring on the Spring guide just incase, Now it doesnt budge, i think it should be fine in there.
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Old 11-29-2005, 10:46 AM #6
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not sure i fully understand, when you guys are putting the "devolumizers" in the cap are you using the same spring? basically it just takes up space so it needs less air? looks pretty easy to do but i wanna understand it a little better before i try it, thanks
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Old 11-29-2005, 10:54 AM #7
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Why couldn't you just fill up the hole with a glue or caulk?
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Old 11-29-2005, 02:00 PM #8
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Quote:
Originally Posted by bgblue1978
not sure i fully understand, when you guys are putting the "devolumizers" in the cap are you using the same spring? basically it just takes up space so it needs less air? looks pretty easy to do but i wanna understand it a little better before i try it, thanks
you dont put the spring back.

i suspose you could fill the cap with caulk or glue. i just always try to make mods reverseable when i first try them.
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Old 11-29-2005, 02:47 PM #9
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if there's no spring in there then how does the ram move forward again? just the air pressure?
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Old 11-29-2005, 04:25 PM #10
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yep.
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Old 11-29-2005, 10:12 PM #11
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Eric,
I was luck enough to score a ventilated RAM body and lightened hammer from dyn2liv before he dropped of the face of the earth.

The logical next step is your ram shaft mod. Would you be willing to fab up one of those nifty stock rods? I'd send a few bucks your way...
Thanks
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Old 11-29-2005, 10:19 PM #12
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HA! man yeah hes left a gap, i got the last one he modded. hahaha

his quality and pricing was the best EVER!!!!


we miss you Dyn
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Old 11-30-2005, 09:18 AM #13
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I thought you needed the spring to prevent FSDO? Any issue with that?
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Old 11-30-2005, 12:10 PM #14
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once youve polished your ram and ported the housing there is really no need for the spring anymore.
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Old 11-30-2005, 12:49 PM #15
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Any idea how much pressure is dropped on the lpr with this mod and the polishing?
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Old 11-30-2005, 04:06 PM #16
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stock lpr suggested psi 90
i think i was at 80

with a polished ram i think i was at 60-70
and that with porting im at 50
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Old 11-30-2005, 05:07 PM #17
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Eric,
Where are you putting the bumper?

Since you cut/sanded the spring guide off the ram shaft, and you filled the cap with the aluminum stock, they'll never touch. As stated above, either the bolt pin will hit the back of the body, or the hammer will hit the ram tube.

Are you suggesting a bumber be placed on the ram shaft between the hammer and the body?
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Old 11-30-2005, 06:11 PM #18
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fo sho.
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Old 11-30-2005, 07:01 PM #19
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Hey Eric,
Sorry for all the stupid questions.

Just curious why you even need to fill the ram cap with the aluminum stock? I don't believe Vapors V4 hammer does this (at least from the pics I can find)...

Do you do it to reduce the volume of air applied to the chamber during the firing stroke?
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Old 12-01-2005, 02:09 AM #20
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you anwser your own questions

yep, its to reduce the amount/pressure of air need to push the ram forward.
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Old 12-01-2005, 08:58 AM #21
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Here's a pic:

Found this on another post.
This is where your bumper is reloacted to when you do this mod. It's the orange donut.

Anyone know where I could get such a thing?... I'll check Lowes tonight.


Last edited by bigkdawg : 12-01-2005 at 09:17 AM.
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