HW80
Printed From: Kiwi Airgunners
Category: Technical
Forum Name: Pauly's Technical Area
Forum Description: Technical information, Modifications and DIY projects are all in here
URL: www.kiwiairgunners.co.nz/forum_posts.asp?TID=693
Printed Date: 28 Oct 2025 at 10:02pm
Software Version: Web Wiz Forums 10.14 - http://www.webwizforums.com
Topic: HW80
Posted By: flock
Subject: HW80
Date Posted: 23 Oct 2022 at 8:35am
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Got a HW80 in .22 was very smooth to shoot but out putting out 13ftp, so have resprung it and as on U tube didn't use any grease on the spring (one that came out had heaps) so now I have 16ftp and a hell of a twang. So dissappointed was hoping to get 20ftps. See a different type of spring with a square section steel design, sounds the bees knees http://www.trademe.co.nz/a/marketplace/sports/hunting-shooting/air-guns-parts/parts-accessories/listing/3826514078?bof=f8Mf7Uzm%20" rel="nofollow - https://www.trademe.co.nz/a/marketplace/sports/hunting-shooting/air-guns-parts/parts-accessories/listing/3826514078?bof=f8Mf7Uzm would this be an improvement in power & smoothness? Or else where do you Guys get the tuning kits from, and what price landed NZ?
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Replies:
Posted By: kruzaroad
Date Posted: 23 Oct 2022 at 8:58am
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seals all good on it? What pellet are you using? Have no dought that you'll get some pretty good advice from ppl who know on this site. I'm less 20fpe on the tx and can pop a hare out to 55m. Poms pop them out at 70m on 12fpe. |
Posted By: flock
Date Posted: 23 Oct 2022 at 9:06am
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Posted By: flock
Date Posted: 23 Oct 2022 at 9:10am
| From what I have read 18ftp is probably it, so I'm there, just wish it was not quiet so harsh.(would greasing the spring settle that?) Amazes me what the Pom's do with 12ftp |
Posted By: kruzaroad
Date Posted: 23 Oct 2022 at 4:11pm
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From what I understand it does. I've greased the spring on the gamo, just a light smear around spring. No lumps or clumps. piston as well. TX will get it soon as its just started that twang sound. As I haven't touched it since I brought it, I'm guessing it's due. |
Posted By: kruzaroad
Date Posted: 23 Oct 2022 at 4:18pm
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Have you tried a heavier pellet in it? you might find it likes the extra weight when firing. |
Posted By: Billbobnz
Date Posted: 23 Oct 2022 at 4:26pm
| Need Mike to comment, he is an ace at problem solving. Did it have the spring guides? I forgot to put them back in on a gun after a rebuild and it's sounded like a church bell after each shot.... Another option to try is put a washer in behind the spring to give it more tension/pressure (some people call the power washer etc...) |
Posted By: flock
Date Posted: 24 Oct 2022 at 4:59am
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Has a inside spring guide. Doesn't have the outer spring sleeve like the Vortec kits have, can see how that would stop the twanging.
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Posted By: kruzaroad
Date Posted: 24 Oct 2022 at 8:04am
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https://www.gatewaytoairguns.org/GTA/index.php?topic=103192.0 Bit of info here on what ppl have done. |
Posted By: flock
Date Posted: 24 Oct 2022 at 2:22pm
| Thanks good read |
Posted By: Pauly5
Date Posted: 24 Oct 2022 at 5:11pm
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To get rid of twang, you can fit a kit that has guides for the spring. Tin Bum tuning sell them. If you take the gun apart and can measure accurately the spring ID and the ID of the piston, it's pretty easy to make up a top hat spring guide for inside the piston. Then using some coke can, or coke bottle make a sleeve for the spring. These take up the gaps around the spring and absorb vibration that causes the twang. |
Posted By: J-S
Date Posted: 26 Oct 2022 at 8:28am
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The HW80 should be around 20fpe. it may be a case that its in fact a UK sub12 model? if that is the case, it may be oversprung which is trying to force power resulting in a harsh cycle. Its a large capacity rifle so at 18fpe it should be pretty smooth - like a 17/18fpe rifle performing at 15fpe will be a lot more tame. sub12 will usually have "Hull Cartridge" on barrel. OX mainsprings are notoriously reviewed as pretty average and removed pretty quickly by airgun tuners.. id stay clear. Weihrauch original springs are likely some of the best quality around. I would try and ascertain for sure its not a 12fpe model, then give it a strip down, clean out, re-lube, change the seal and spring to HW original, (also look into Titan springs for aftermarket) Polishing the spring ends and using a little moly paste can help twang Or go the tuning route - TBT (airrifletuning.co.uk) have a pro kit including spring guides and spring etc http://www.airrifletuning.com/store/weihrauch-hw80-35-maxi-tuning-kit/" rel="nofollow - http://www.airrifletuning.com/store/weihrauch-hw80-35-maxi-tuning-kit/ Nick from TBT is helpful, so he may be able to give advice as well - to ascertain if its a full power or UK version. Weihrauchs do twang, the spring guides are steel and not usually a tight fit (perhaps allowing some variance in spring winding?) so can be a little harsh until they settle. Tight fitting guides will eliminate a lot of the twang and a thin layer of grease will help as well. Id use a dry spring in a low power target rifle but not in a high power sporter. ------------- https://www.instagram.com/js_airguns/" rel="nofollow - J S Airguns Air Arms TX200('s) Theoben Sirocco HW77 FWB 300s Webley Patriot One or two others... Current projects: Too many.. |
Posted By: flock
Date Posted: 01 Nov 2022 at 7:47am
| Thanks J-S tried the 16g JSBs but the accuracy wasn't there, the 14g JSBs shot real well. Will put up with the tang, next time I'll go the TBT way. |
Posted By: dvlnme
Date Posted: 01 Nov 2022 at 8:35am
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js is proberly right about your rifle,but higher fpe isnt everything when comes to airgun hunting,i have no hesitation taking a 12fpe 177/22 cal gun small game hunting as js said they doso very effectivly in the UK out to considerable distances with 12fpe rifles i have 177cal pcp rifles that are twice 12fpe and 22 cal rifles up to 3 or more times 12fpe i use for hunting,the only real advantage more than 12fpe is the rifles can effectivly use much heavier pellets a decent velocitys,it really all comes down to accuracy accuracy is key for effective airgun hunting,any rifle that will keep 5 shots within 10mm at 15yds will be very capable of head shots on rabbits etc out past 50yds as many forum members can attest to,there is no point chasing more power if accuracy deterorates at higher power levels as it can do at times, there is bound to be a 16gr pellet this rifle will shoot very accuratly,its just a matter of trying different 16gr pellets til you find one that will give you the accuracy you want thats my two bobs worth anyway. cheers mike
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Posted By: flock
Date Posted: 01 Nov 2022 at 9:43am
only spitting the 14g at 750
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Posted By: kruzaroad
Date Posted: 01 Nov 2022 at 10:29am
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I ran 14.3gr round nose deablo through gun chair at 750 ftps Here's the graph. Thats enough to bowl a hare over at 100yards, 91.44m. 
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Posted By: kruzaroad
Date Posted: 01 Nov 2022 at 10:36am
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It still has around 5fpe @ 128m. you want me sort out 20 AA field 16gr pellets and send them to you for trial. save buying a tin |
Posted By: flock
Date Posted: 01 Nov 2022 at 11:16am
| Thanks for the offer, JSBs are doing fine. 3 shots threw each other at 25 yards. |
Posted By: dvlnme
Date Posted: 04 Nov 2022 at 1:59am
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its generaly accepted in UK that it only takes 6fpe from small 177 pellet to cleanly kill rabbits with a head shot,the main advanages of higher velocitys are higher fpe/flatter trajectorys/shorter flight time and capability to use heavier pellets at decent velocitys,the advantage of heavier pellets is tho velocity maybe lower than lighter pellets they hold that velocity for longer and tend to shoot flatter for longer distances than lighter pellets so hold more energy for longer as well and tend not to be as affected by wind as much lighter pellets,in the end it all comes down to the most accurate pellet for the rifle or pistol, learning its trajectory out to the max distance you are most likely to shoot it out to,and then put a lot practice into learning how to shoot it over a range of distances out to that max distance,its really all about learning your rifle and what its capable of,the kill area of a rabbit/hares head is approx 25mm in diameter for a brain kill shot,i use twist caps of my beer bottles for practice hunting targets,because they are easy to see and reacte when hit i place them at radom distances out to100m,when i can no longer consistantly hit these 27mm targets thats the max distance i use that gun for hunting,i find this works better for me than paper targets because i dont need to check targets to know when i hit them and they lot more fun to shoot at than paper eh. cheers mike
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Posted By: kruzaroad
Date Posted: 04 Nov 2022 at 2:57am
If I've ever heard an excuse for a beer, that's got to be it. 
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Posted By: grbaker5
Date Posted: 04 Nov 2022 at 6:09am
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I would definately remove the old grease and then Moly grease the spring... not heaps but enough to allow smooth metal on metal contact. Just some thoughts... the twang sound is generated right next to you ear when firing. If you stand away from the rifle (have someone else fire it) it isn't that loud... I have found springs quiter than thump of nitro-pistons but that may be subjective. If it makes a twack sound the spring is broken... so twang is good.  Vortex and other make after-market nylon spring guide kits, including HW80s. I have one to fit to my TX200 but I haven't bothered since its twang doesn't scare the bunnies. http://vortekproducts.com/ourstore/index.php?route=common/home Obviously they ship to NZ but not sure wehat that would cost presently.
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Posted By: JasonEdward
Date Posted: 15 Oct 2025 at 11:05am
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I have an old well used HW80 .22 that I believe performs approximately to spec at 17.42 foot pounds on H&N FTTs at 14.66 gr leaving the muzzle at 732 fps. I have not yet fitted the .177 barrel I have but that could be interesting... It is the most noisy twangy rifle I have ever used but it shoots straighter than most. Diana Model 52 .177 at 16.67 foot pounds on H&N Barracuda 10.65 gr 840 fps, for example has similar recoil but much less twang - the HW lets your ears know there is heavy stuff moving inside it when you shoot it. I'm not sure there is much difference at all with recoil/feel between the two but the sound from the HW may be making me feel and think it has more recoil...but I think that could be my subjective impression based on what my ears tell me. My general understanding is tuning reduces that twang but has minimum effect on accuracy. Except an expert can tune better than that but unless you get lucky, expertise is required. Consensus seems to be they are great rifles - and I agree - but a little over-cooked in power so not quite as accurate as other HWs. |
Posted By: kruzaroad
Date Posted: 15 Oct 2025 at 12:35pm
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I got tbt kit. They just run smoother and quieter. The bottom guide and slip washer make a difference and the tolerance of the guides is way tighter inside the spring. Looking at the hw80 exploded view its the same as the hw97, the metal spring pushes into the metal piston an sits metal to metal. Like have a amplifier for the spring resonation. There are 25mm and 26mm pistons for weihrauch depending on the year, so if you go kit be aware of that. You can find the online what years and models ran what piston. I wont go back to standard set up. ( Unless spring breaks, then the replacement weihrauch spring I got as a replacement spring for orginal spring which broke will go in till get another kit) I have nothing bad to say about the kit. Arrived way fast too. |
Posted By: kruzaroad
Date Posted: 15 Oct 2025 at 1:09pm
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I looked at hw80 exploded diagram. It runs the same set up as the hw97. The metal spring going into the metal piston, metal on metal. We all know how ringy metal on metal is. It has the whole spring tube to fire sound back down. Its an echo chamber for spring resonation. Put your phone, speaker first, into a cup, put on some sounds you'll see what I mean. Tbt kit with a bottom guide and slip washer stop that metal on metal and allow the spring to turn as its cocked or fired. Guides are tighter too. No extra power no loss of accuracy but quieter, and a hell of a lot smoother cycle. I'll be using kits from now on. |