Tuning RAW HM1000X improved parts ready for dispatch to make the gun more efficient and powerful

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mubhaur

mubhaur

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Nov 8, 2015
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For two friends from US and a friend from Holland, three sets of high efficiency quality tested parts for RAW HM1000X are ready for dispatch.

70cc and 80cc external plenums
High efficiency valves
Anti hammer bounce devices

Regards,

Umair Bhaur
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Mubhaur,
What's difference between your valve vs. OEM?
I know it's made of SS instead of brass, but is the throat that much bigger - providing more flow?
I've already installed a peek poppet for improved efficiency and could easily drill out the throat a bit.

Also, I've added 20 CC's of plenum to 1 of my RAW's .... which I believe gives me about 50cc's of total plenum space.
It's almost seems unnecessary to add more than 50cc's unless your shooting a .30/.35 caliber RAW:unsure:.

The most power I would ever need in .25 caliber is 70FPE -> Hence I think a 50cc in plenty!

What do you think?

The regulator may need to be turned up a whisker to offset, but not much.

See post #9:

Tuning - Plenum size formula/calculation ?

Is there a formula that models the appropriate plenum volume, pressure, barrel volume to compare/contrast sizes and pressures? Say I was going to build a custom plenum for a rifle with a dedicated tune and wanted to know what 1cc more or 1cc less plenum space would do. Is there a function or...
www.airgunnation.com www.airgunnation.com
 
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SpiralGroove said:
Hey Mubhaur,
I'm not trying to subtract from the many improvements you have made for RAW and FX guns.

Practically speaking what do U think of my questions on the valve and plenum?

Any thoughts would be appreciated:).
Click to expand...
Sorry for delay in replying.

My valve design allows it to open quickly and close quickly. This saves air. Resultantly the gun becomes efficient.

It's not the matter of brass or stainless steel.

Further, as per my research the best volume of plenum to attain one ftlb is 1cc.

The great Bob Stern also has same opinion.

We can achieve more powers without 1 to 1 ratio by increasing regulator pressure.

The maximum we should squeeze 3 ftlb from 1cc volume.

I have never tested but my feeling is that RAW HM1000X regulated volume while using OEM regulator is between 25cc to 30cc.

I am using the external plenum of 35cc.

I am not into heavy slugs or even light weight slugs. Hence total volume of 60cc to 65cc is good enough for my needs.

If I needed to shoot heavy slugs, I would prefer longer barrel and bigger external plenum.

I hope it helps.

Bhaur
 
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No problem Mubhaur .... you're a very busy Guy(y).

Yeah, even Martin will not confirm the plenum size, although he likely knows. Last speculation was 30cc, but ....
Right now - I'm shooting 34 grain JSB pellets to about 895/915 and used 950/960 fps as a max to conservatively get 70FPE.

Given that power lever a 45cc or 55cc total plenum would give .643 or .786 ratio to FPE:) .... not ideal, but far from a problem.
Since your max squeeze ratio is .334, my plenum space is about 2x the max or more.

The pics below reflect it's somewhat crude appearance relative to yours; thankful that it's hidden underneath the stock.

Newest Plenum.JPG


Stock up to bottle.JPG
 
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Michael said:
Is anyone making an “in-line” plenum? One that might be a bit more PRS style shooting friendly?

I’ve placed an order for an HM1000x. I want to make it a dedicated slug shooter in .22 cal. What type of velocities and slug weights can I expect in OEM form?
Click to expand...
I think you should let the gun come. Then you can test it for fps and fpe.

If you share that data and your required fps we can look into it.

Bhaur
 
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mubhaur said:
I think you should let the gun come. Then you can test it for fps and fpe.

If you share that data and your required fps we can look into it.

Bhaur
Click to expand...
Everyone I’ve spoken to said they’ve had to add a plenum (consensus is at least 20cc) to get it to be a good slug shooter.
 
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Michael said:
Everyone I’ve spoken to said they’ve had to add a plenum (consensus is at least 20cc) to get it to be a good slug shooter.
Click to expand...
I didn’t.
I shoot 20.2gr nsa slugs. But I have a custom fx liner barrel built by AZ
I’m using a pre Airforce action, that has the smaller reg threads. So I have less plenum space than the current hm1000x actions.
Doing 928fps on a 140bar reg
 
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Michael said:
Everyone I’ve spoken to said they’ve had to add a plenum (consensus is at least 20cc) to get it to be a good slug shooter.
Click to expand...
I make the external plenum from 35cc to 80cc depending on the requirements.

We have entered into a new era of airgunning where we have made FX Impact to be a benchmark for power and efficiency.

My high efficiency valve, anti hammer bounce device and at leat 35cc of external plenum when combined gives nice results.

I understand that the OEM plenum of RAW is around 25cc to 30cc. When we add at leat 35cc it becomes 65cc.

If we add 50cc external plenum the total becomes 80cc which is good enough for the combination of power and efficiency.

A 700mm barrel also plays a great role in achieving high fps and efficiency.

Bhaur
 
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corny said:
I didn’t.
I shoot 20.2gr nsa slugs. But I have a custom fx liner barrel built by AZ
I’m using a pre Airforce action, that has the smaller reg threads. So I have less plenum space than the current hm1000x actions.
Doing 928fps on a 140bar reg
Click to expand...
Sounds neat, AZ does phenomenal work. But for long-distance slugging I’d prefer to shoot projectiles greater than 25g.
 
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mubhaur said:
For two friends from US and a friend from Holland, three sets of high efficiency quality tested parts for RAW HM1000X are ready for dispatch.

70cc and 80cc external plenums
High efficiency valves
Anti hammer bounce devices

Regards,

Umair Bhaur
View attachment 371285View attachment 371286View attachment 371287
Click to expand...
Umair, We need some help on purchasing two of your Vertical Plenums for our RAW air rifles. We shoot Benchrest Competition 25 meters and 50 meters. We will appreciate any help or information on this. Sincerely, Doug and Vipha Miller you can verify us: Google: "Vipha Miller " my wife. Thank you.
 
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SpiralGroove said:
Mubhaur,
What's difference between your valve vs. OEM?
I know it's made of SS instead of brass, but is the throat that much bigger - providing more flow?
I've already installed a peek poppet for improved efficiency and could easily drill out the throat a bit.

Also, I've added 20 CC's of plenum to 1 of my RAW's .... which I believe gives me about 50cc's of total plenum space.
It's almost seems unnecessary to add more than 50cc's unless your shooting a .30/.35 caliber RAW:unsure:.

The most power I would ever need in .25 caliber is 70FPE -> Hence I think a 50cc in plenty!

What do you think?

The regulator may need to be turned up a whisker to offset, but not much.

See post #9:

Tuning - Plenum size formula/calculation ?

Is there a formula that models the appropriate plenum volume, pressure, barrel volume to compare/contrast sizes and pressures? Say I was going to build a custom plenum for a rifle with a dedicated tune and wanted to know what 1cc more or 1cc less plenum space would do. Is there a function or...
www.airgunnation.com www.airgunnation.com
Click to expand...
Can the valve be direct replacement for the original? what is the cost.
kent
 
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