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My Marauder 25. I need help

November 9 2017 at 4:22 PM

Skip in WV  (Login SkipinWV)
YF12

Goal: with a 25.4 grain pellet. 40 ft lbs. That equals about 850 fps.

Here is what I've done so far:
1. Installed a heavier hammer spring. Max speed 900, but terrible power curve with
only 10 good shots, averaging 875fps.
2. Installed a Lane Mk8 regulator. Max speed 750
2. Added an FFH. Max speed 750
4. Replaced the TP with a piece of tubing. Max speed 750.
5. Replaced that valve spring with a lighter one. Max speed 750
6. Added a Lane regulator extension tube for an additional 10cc volume. Max speed
750.

As I see it I have 3 options left
1. Increase the regulator pressure.
2. Increase the TP hole in the valve.
3. Increase the TP hole in the barrel.

If any of that works remove the 10cc extension and see what happens.
I hope someone has some other suggestions?

 
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AuthorReply
BillE.
(Login garczar)
YF12

One way.................

November 9 2017, 6:42 PM 


 
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Skip in WV
(Login SkipinWV)
YF12

Thanks.

November 9 2017, 7:39 PM 

Hoping for something less expensive. Something I can do myself.


    
This message has been edited by SkipinWV on Nov 9, 2017 8:34 PM


 
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BillE.
(Login garczar)
YF12

Re: Thanks.

November 9 2017, 8:57 PM 

Without some type of valve work i don't think 1,2,or3 will get the power you're looking for. Good place for Mrod info: MarauderAirrifle.com. Check out the .25 section.
"\"\""

 
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Ray B.
(Login kidpellet)
YF12

Turn up the regulator

November 10 2017, 5:16 PM 

You already had the power before the regulator, with what you have mentioned I would turn up the regulator. More power almost always means less shots. Also check the transfer port screw to make sure it's opened up all the way.

 
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Quinton L
(Login Domer_Pyle)
YF

I never wrote down my turns but bone stock I was getting about 870-890-870 over 16 shots

November 10 2017, 7:24 PM 

With JSB Kings. I've since taken apart and modified some things while making my own FFH so unfortunately I can't be of more help but you should be able to get where you'd like to be

 
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BillE.
(Login garczar)
YF12

Re: I never wrote down my turns but bone stock I was getting about 870-890-870 over 16 shots

November 10 2017, 8:45 PM 

That's pretty sweet power level for stock rifle.
"\"\""

 
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Quinton L
(Login Domer_Pyle)
YF

I think the tail end may have dropped a little lower but those are pretty close numbers

November 11 2017, 2:12 AM 

I can't really try again since I drilled the threads out of the hammer for the FFH but curiosity has definitely taken over after mentioning this

 
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Lonnie
(Login AirSmithCA)
YF

You will need to do all three to achieve your goal....

November 13 2017, 7:49 PM 

And i'll be impressed if you can do it with a regulator. I tried that with mine and even with 2000psi working regulated pressure i couldnt get 40fpe. There wasn't enough regulated air per shot in the plenum between the regulator and/in the valve.

I'm pretty sure its possible of you increase the plenum size and open up the transfer ports but I came to the conclusion there wasn't enough shots in the Mrod to be worth the trouble at 40fpe.

All that said, I'd love to hear of your success if you pursue it. happy.gif
"It doesn't get done til someone does it"

 
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