WEİHRAUCH HW98 .177

[moonlight]

Hello,
I have weihrauch hw98 .177 rifle.
I just bought the rifle.
The rifle's production year is 2017. I removed the weak spring from the rifle.
I had a Titan no8 spring installed. I measured the output velocity with jsb 10.34 grain pellet.
average speed 660 fps. This speed is equivalent to 13.5 joules.
I thought hw98 rifles were 20 joules. Is the 660 fps velocity I measured with 10.34 grain normal?

 

[TnCnDn]

Good question

 

[Shuggoth]

That seems low for a 98, mine is same era in .177 and shoots 13ftlb with stock spring.

 

[beerthief]

Hello,
I have weihrauch hw98 .177 rifle.
I just bought the rifle.
The rifle's production year is 2017. I removed the weak spring from the rifle.
I had a Titan no8 spring installed. I measured the output velocity with jsb 10.34 grain pellet.
average speed 660 fps. This speed is equivalent to 13.5 joules.
I thought hw98 rifles were 20 joules. Is the 660 fps velocity I measured with 10.34 grain normal?

That sounds like a good speed to shoot , just under 10 FPE , strong enough for small game and still pleasant to shoot all day .

 

[Mycapt65]

It will make more power with 8.44s . Did you change the piston seal? Who knows what it should do with a different spring?

 

[OldVet]

What did the weak stock spring produce in power , and is it possible to shim the spring up for a little more.

 

[moonlight]

It will make more power with 8.44s . Did you change the piston seal? Who knows what it should do with a different spring?

I changed the piston seal. Trying with the Weihrauch fac spring maybe change the result.

 

[moonlight]

What did the weak stock spring produce in power , and is it possible to shim the spring up for a little more.

10 fpe power. 660 fps with 10.34 grain.

 

[OldVet]

Both springs produced the exact same power?

 

[moonlight]

Both springs produced the exact same power?

 

[moonlight]

I installed a Titan XS8 spring. I haven't installed the weihrauch fac spring yet.
When the rifle first came, it came with a 7.5 joule spring.
I removed the 7.5 joule spring and installed the Titan xs8

 

[OldVet]

I installed a Titan XS8 spring. I haven't installed the weihrauch fac spring yet.
When the rifle first came, it came with a 7.5 joule spring.
I removed the 7.5 joule spring and installed the Titan xs8

Ok. Now I understand. Are these springs all the same length ?

 

[moonlight]

I didn't think to measure. Do you recommend that I try wearing the original Weihrauch original fac spring?

 

[OldVet]

I have studied metallurgy. I know a lot about spring steels. I can't recommend a thing for springers I have never owned one , but would like to help with this problem if I can. I know for a fact if you preload a spring it will develope higher pressures. It's going to be some trial , and hopefully not errors , but if the factory spring is available in new condition then yes as it should bring back that 20 joules your looking for , and an additional spacer to preload it can slightly increase the power. I have background in gunsmithing , and mechanics.. I dealt with recoil issues in weak recoil springs of the AR-15 , and replaced them with new Wolf springs which solved the problems. If you use a super light oil for lube it would be a plus. An additional inner coil if it were at all possible would be nice.

 

[Mycapt65]

Length isn't that important. Longer springs can be made of thinner wire and be weaker than shorter springs. Measure the outside diameter of the spring and the wire diameter. Then count the coils. This can give us an idea of the spring's strength.

What seal did you use?

 

[Mycapt65]

Dont use oil in a springer. It will diesel and burn the piston seal

 

[moonlight]

26mm piston seal.

 

[Twinkees_n_Pb]

Dont use oil in a springer. It will diesel and burn the piston seal

Just curious, what lub is used here?

 

[moonlight]

Just curious, what lub is used here?

I guess silicone grease

 

[Mycapt65]

26mm piston seal.

Yes that's the correct size. But who manufactured the seal?