Author Topic: 75 kg gas ram (Read 13500 times))

havenofear · « **Reply #20 on:** February 24, 2018, 12:04:48 AM »

Quote from: Back_Roads on February 23, 2018, 08:48:36 PM

I have been thinking it wouldn't be that hard , provided one had proper tools , to make a rebuild-able / adjustable pressure air ram as a replacement option and tune-ability. not much different than an air tube for a PCP.

No need to do anything to Crosman gas rams. They are cheap and reliable. Both my H155 and H125 are Crosman NP powered. So far, my most powerful gas ram gun is the H155 followed by H125, Benji NPXL, Diana 48 and Benji NPAW (installed with SMS Brazillian gas ram 3 years back). All in .22

franz62 · « **Reply #21 on:** February 24, 2018, 11:35:17 AM »

Here I am again to write.
I use industrial gas pistons and I normally use them for work
as shock absorbers on scales plates.
I buy them from an Italian company specialized in the sector.
I enclose technical specifications of the pistons that interest us.

havenofear · « **Reply #22 on:** February 25, 2018, 12:21:18 AM »

Vortex gas rams are filled with compressed air which degrades the o-rings over time. The o-rings in the tanks of PCP suffer the same fate and we have to replace these o-rings after some time. If the vortex gas rams are filled with nitrogen, I believe they will last very much longer. Those who are able to open up their vortex gas rams should try to refill them with nitrogen and see how they perform.

franz62 · « **Reply #23 on:** February 26, 2018, 04:30:04 AM »

The gas pistons of the SpecialSpring are filled with nitrogen and they go really well.
Only that having been born for other purposes it is necessary to adapt them with thick washers.

Ciao Francesco

Yogi · « **Reply #24 on:** February 26, 2018, 02:54:55 PM »

Quote from: franz62 on February 26, 2018, 04:30:04 AM

The gas pistons of the SpecialSpring are filled with nitrogen and they go really well.
Only that having been born for other purposes it is necessary to adapt them with thick washers.

Ciao Francesco

Which one would you pick for the Hatsan 95 Vortek?

Thanks,

Yogi

Privateer · « **Reply #25 on:** February 26, 2018, 04:24:32 PM »

Quote from: havenofear on February 25, 2018, 12:21:18 AM

Vortex gas rams are filled with compressed air which degrades the o-rings over time. The o-rings in the tanks of PCP suffer the same fate and we have to replace these o-rings after some time. If the vortex gas rams are filled with nitrogen, I believe they will last very much longer. Those who are able to open up their vortex gas rams should try to refill them with nitrogen and see how they perform.

That would be fantastic to try if not for the cost of getting Nitrogen tanks to do that. Not to mention the correct fill gear.
The whole thing about the Hatsan Rams was you can fill with air. So your suggesting, even though we can not buy one, we fill it with a high cost gas.

I'll just change to a company that I DON'T have problems buying from. Much cheaper on my wallet.

fotomat1 · « **Reply #26 on:** February 26, 2018, 08:17:47 PM »

Which Crosman would be best for Edge,Striker or 95? Thanks

Mole2017 · « **Reply #27 on:** February 26, 2018, 11:00:13 PM »

I can't say for sure, but it must be something like a the preload or "average" or maximum axial force on the ram. When I got one for my CFX there were 45 and 55 kg (kilogram) versions available (I think those were the numbers). Anyway, discussion lead me to stick with the lower number instead of going higher like some people thought (more power, right? Blown seals more likely).

So, I see Custom Airseals carrying the 75 kg ram. You might ask them what the number means.

Or you might read about it here: http://www.indgassprings.com/how-gas-springs-work.html. Actually, I learned something here--I never realized the piston inside is ported. It makes sense though. As you can see from the diagram, there is a likelihood of a significant preload already, and that was my experience with the gas ram I bought. I see they have a calculator too--that might be fun to check out.

PS Scratch that calculator--it is just a short discussion of the calculation.

SteveP-52 · « **Reply #28 on:** February 27, 2018, 12:29:13 AM »

Quote from: fotomat1 on February 26, 2018, 08:17:47 PM

Which Crosman would be best for Edge,Striker or 95? Thanks

The standard Crosman NP ram, part # BT9M22-00-5A. Takes a little modifying but there's a thread or 5 on GTA about doing it if you do a search for converting a Hatsan to a Crosman NP.

Back_Roads · « **Reply #29 on:** February 27, 2018, 12:50:31 AM »

havenofear · « **Reply #30 on:** February 27, 2018, 05:04:46 AM »

Quote from: fotomat1 on February 26, 2018, 08:17:47 PM

Which Crosman would be best for Edge,Striker or 95? Thanks

I believe that the 95 and 85 have the same compression chamber dimensions. I have installed the Benji NPAW (not the NPXL) into my 85 sniper before but found it lacking the power that I wanted. I am pretty sure that the Crosman NP2 nitro piston can be installed into the 95. You need a spacer and a centering block.

REACTOR - NIN · « **Reply #31 on:** February 27, 2018, 12:20:13 PM »

Crosman and Benjamin NP. rifles are now made in China. Probably their NP spring pistons are from China too. I suppose that Gamo, Norica, Hatsan, and others don't manufacture their own spring pistons in their factory. They are probably imported from else where.
Have anyone try using China NP. gas spring piston???

REACTOR - NIN · « **Reply #32 on:** February 27, 2018, 12:24:48 PM »

Anyone?

REACTOR - NIN · « **Reply #33 on:** February 27, 2018, 12:25:32 PM »

Specification.

REACTOR - NIN · « **Reply #34 on:** February 27, 2018, 12:26:24 PM »

Specification

REACTOR - NIN · « **Reply #35 on:** February 27, 2018, 12:27:25 PM »

There are many more...

franz62 · « **Reply #36 on:** February 28, 2018, 01:23:04 PM »

Quote from: Yogi on February 26, 2018, 02:54:55 PM

Quote from: franz62 on February 26, 2018, 04:30:04 AM
The gas pistons of the SpecialSpring are filled with nitrogen and they go really well.
Only that having been born for other purposes it is necessary to adapt them with thick washers.

Ciao Francesco

Which one would you pick for the Hatsan 95 Vortek?

Thanks,

Yogi

depends on the stroke of the piston.
It is sufficient to put the tool to clean the unloaded rifle inside barrel, make a mark, then load the rifle and replace the tool and mark it.
with a meter see the distance of the piston.

I hope I have been helpful

Ciao
Francesco

Privateer · « **Reply #37 on:** February 28, 2018, 05:26:26 PM »

The Hatsan 95 has a stroke of 90mm I believe.

RBQChicken · « **Reply #38 on:** February 28, 2018, 11:39:04 PM »

Just keeping track of this thread.

franz62 · « **Reply #39 on:** March 01, 2018, 04:52:04 AM »

Quote from: Jeff aka Privateer on February 28, 2018, 05:26:26 PM

The Hatsan 95 has a stroke of 90mm I believe.

model of the pistome is M90-100 with red color for 140 ATM equal to 70KG of force or yellow force 180 ATM equal to 90KG of force

https://www.gatewaytoairguns.org/GTA/index.php?action=dlattach;topic=112171.0;attach=218071

Ciao
Francesco

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75 kg gas ram

Author Topic: 75 kg gas ram (Read 13500 times))