HW35 Fettling

[Waddy]

Yep, bearing in mind that it's using the older style piston, Paul (shorter stroke) and with the stroke further reduced by the 'O' ring head, I'm guessing very efficient.

Sorry to hear of your missing 'O' ring. I hope you manage to get one quickly so that you can get the 100 running as it should.

I'm wondering if my reduced & revolving piston HW80 is an O ring, not had a chance to strip it as there has always been something else in bits. I bet it's the work of someone on this forum. It's running just over 9 ft/lbs & I'd like to up that a tad for long range shooting. I'm thinking it's more likely to be seal wear than the spring.


I've got all the O rings for the 100, the missing ring was how it was when I got it. I was watching a strip & rebuild you tube when I spotted the ring on the youtubers valve which isn't there on mine.

The parts & respective rings are all laid out now ready to be fitted.



.

[Hsing-ee]

Still can't decide to keep, store, fettle, dispose or break mine.

I forgot how annoyingly hard they are to cock, and remember why the Anschutz 335 and Feinwerkbau Sport gave them a good run for the money. It's like a big clunky Tiger Tank lumbering about the place. It's like, listen mate, your younger sister the HW80 can do 20 fpe and shoot bricks in half, while you just struggle to make 11 fpe while giving everyone a hernia. FFS 35 sort yourself out. Must have had my double thick rose-tinteds on when I got this mad idea to kit-car one up from bits. I mean I already have a 77, what was I thinking?

[harvey_s]

On a slightly left-field tack... what are people's opinions on the best way to run a modern HW35 (2015 according to Weihrauch's serial number database) at around 6-7.5 ft/lbs for bell target duty?

[TonyL]

Good result Tone

Cheers JB. And thank you for your valued input.

[TonyL]

@ harvey_s......I'd say a stroke reduction (Tinbum sells the piston nose extensions which would make this very easy and reversible) plus reduce the mainspring in stages to get to the desired output and firing cycle?

[TonyL]

Still can't decide to keep, store, fettle, dispose or break mine.

I forgot how annoyingly hard they are to cock, and remember why the Anschutz 335 and Feinwerkbau Sport gave them a good run for the money. It's like a big clunky Tiger Tank lumbering about the place. It's like, listen mate, your younger sister the HW80 can do 20 fpe and shoot bricks in half, while you just struggle to make 11 fpe while giving everyone a hernia. FFS 35 sort yourself out. Must have had my double thick rose-tinteds on when I got this mad idea to kit-car one up from bits. I mean I already have a 77, what was I thinking?

I do know what you mean, Al. Compared to some lighter, shorter and slimmer rifles that can make power easily, the '35 does take a little effort. As you've said before, it must be something to do with the geometry of the articulated cocking lever. But with the extra efficiency afforded by the 'O' ring and breech fix (courtesy of NickG expertise) and being able to shorten the spring so much, this one's now very easy to cock. If I were to reduce the output to around 10.5ft.lbs, it'd be sweeter still.
In terms of handling, I think it's just a question of getting used to the '35 again. I hadn't used one for a while. And it seem to be too long and a "bit of a lump" at times when I was testing between rebuilds. But now that I've got used to it again it doesn't seem so unwieldy and I really was enjoying using it on Monday.

Of your stated options, give the old girl a fettle and see if you can ignite the romance again.

[TonyL]

I'm wondering if my reduced & revolving piston HW80 is an O ring, not had a chance to strip it as there has always been something else in bits. I bet it's the work of someone on this forum. It's running just over 9 ft/lbs & I'd like to up that a tad for long range shooting. I'm thinking it's more likely to be seal wear than the spring.

.

When you get the chance, definitely worth pulling it to bits then, Paul, and having a look.

If it's 25mm it might be using a parachute seal?

Obviously, the 'O' ring route can be chosen for any bore size, as they're easily and cheaply available. Be interesting to know what's inside.

[T 20]

I'm wondering if my reduced & revolving piston HW80 is an O ring, not had a chance to strip it as there has always been something else in bits. I bet it's the work of someone on this forum. It's running just over 9 ft/lbs & I'd like to up that a tad for long range shooting. I'm thinking it's more likely to be seal wear than the spring.

If it's reduced and revolving it could well be fitted with a TX or Walther LGV piston as both of these have revolving pistons, in which case folks normally use them with a TX, Walther or Weihrauch 25mm seal.

Bigtoe/Tony Leach converted a few 80s like this a few years ago using Walther LGV pistons --- from memory he had to use a cut down new type cocking shoe to get clearance, so if you take the stock off you could look at the cocking shoe to see if it's one of his.

Venom also did a reduced cylinder HW80 but I'm not sure if they had rotating pistons or not ?





All the best Mick

[Shed tuner]

Venom also did a reduced cylinder HW80 but I'm not sure if they had rotating pistons or not ?

I think they were fixed Mick...

[TonyL]

If it's reduced and revolving it could well be fitted with a TX or Walther LGV piston as both of these have revolving pistons, in which case folks normally use them with a TX, Walther or Weihrauch 25mm seal.

Bigtoe/Tony Leach converted a few 80s like this a few years ago using Walther LGV pistons --- from memory he had to use a cut down new type cocking shoe to get clearance, so if you take the stock off you could look at the cocking shoe to see if it's one of his.

Venom also did a reduced cylinder HW80 but I'm not sure if they had rotating pistons or not ?

All the best Mick

Once again, excellent insight, Mick.

Yep, as Jon says, pretty sure the 25mm Lazaglide 80 didn't use a rotating piston.

[T 20]

I think they were fixed Mick...

Yes, I thought they were keyed, Jon.

And I think I read that they used a 25mm HW77 piston for the first ones, but having never seen one I don't know for sure.

[deejayuu]

Yep, bearing in mind that it's using the older style piston, Paul (shorter stroke) and with the stroke further reduced by the 'O' ring head, I'm guessing very efficient.

Sorry to hear of your missing 'O' ring. I hope you manage to get one quickly so that you can get the 100 running as it should.

Always a good read on here, thanks all. By 'older piston' do you mean leather sealed compared to synthetic or did they have different length rods etc please?

[TonyL]

Yes, it's the piston intended for the leather seal, Jules. It was previously fitted with an adaptor for a parachute seal by the previous owner. Now wearing the adaptor that NickG made for me for the 'O' ring.
We went down the bespoke 'O' ring route, as a new parachute seal was a very loose fit.

Leather sealed guns have a shorter stroke than synthetic sealed ones. As usual, our Mick will have the full technical differences.

[harvey_s]

@ harvey_s......I'd say a stroke reduction (Tinbum sells the piston nose extensions which would make this very easy and reversible) plus reduce the mainspring in stages to get to the desired output and firing cycle?

Thanks Tony...

[junglie]

Still can't decide to keep, store, fettle, dispose or break mine.

I forgot how annoyingly hard they are to cock, and remember why the Anschutz 335 and Feinwerkbau Sport gave them a good run for the money. It's like a big clunky Tiger Tank lumbering about the place. It's like, listen mate, your younger sister the HW80 can do 20 fpe and shoot bricks in half, while you just struggle to make 11 fpe while giving everyone a hernia. FFS 35 sort yourself out. Must have had my double thick rose-tinteds on when I got this mad idea to kit-car one up from bits. I mean I already have a 77, what was I thinking?

Thats funny my 35e & my current bitza 35 made full power with just a service & relube, both on old leather washers, the bitza 79 action running a piston & seal from the mid 60's ! (both .22)