Taming the HW80 my way

[maz001471]

Thank you for that brilliant info , and can i ask you if you are going to the springer bash and if you can bring this along for us to enjoy ??.
cheers Maz.

[Shed tuner]

Thanks WD, great write up.

So the lesson here seems to be that (very) short strokes in large diameter cylinders do work, but need heavy pistons ?

I may revisit my sirocco that we'd spoken about previously - .177, 31mm bore, I short stroked to 61mm but only got 9 FP - maybe I should add some mass to that piston....

Anyone else looking for to the springer bash even more now ?

[Craig-P]

Brilliant stuff! Thanks for sharing, Dave.

Cheers, Craig

[landymick]

As above, an informative read & one i would like to try at some time.Well done.

[gibboj]

hi wonky done much the same tune on my 80 but with buttons and a longer / softer spring [its got a big bespoke piston linner so the spring is held tight] still thinking off taking a bit of weight of the piston ? but it feels nice as it is ,wots your thoughts on light pistons wonky. also short stroked a smk xs20 [95 clone] made a delrin head for that one ,that on a 26mm piston. that shoots well but not had none of them down since short stroking to see how thay are wearing on the heads, id love to shoot a lazerglide or one of your or bigtoe tunes to see how mine compears and see wot all the fuss is all about
atb john

[prosport.177]

Hi wonky,
Good job, just noticed the latch rod has a button on the end, not the usual hw slot.
Have you made piston rotary and modded the trigger sear?

[wonky donky]

Hi wonky,
Good job, just noticed the latch rod has a button on the end, not the usual hw slot.
Have you made piston rotary and modded the trigger sear?

Yes it's a rotary piston Charlie.

[TonyL]

Dave, me VERY excited and giddy now....Can't wait to see and feel this beast, if I may...and all of those other toys detailed!

Knackered a little for time just now and got to log off, but the OP is brilliant and also some of the further posts added.

EXCELLENT THREAD, will look in later.

[wonky donky]

Thank you for that brilliant info , and can i ask you if you are going to the springer bash and if you can bring this along for us to enjoy ??.
cheers Maz.

I hope to Maz

Thanks WD, great write up.

So the lesson here seems to be that (very) short strokes in large diameter cylinders do work, but need heavy pistons ?

I may revisit my sirocco that we'd spoken about previously - .177, 31mm bore, I short stroked to 61mm but only got 9 FP - maybe I should add some mass to that piston....

Anyone else looking for to the springer bash even more now ?

Jon I used lots of pre-load to try to counteract any piston bounce, I'm going to redesign the piston now because as it is I'm not in the springs sweet spot. When I did the original conversion for last years springer bash I used the heavy standard spring to counter act bounce & a lot less pre-load.

hi wonky done much the same tune on my 80 but with buttons and a longer / softer spring [its got a big bespoke piston linner so the spring is held tight] still thinking off taking a bit of weight of the piston ? but it feels nice as it is ,wots your thoughts on light pistons wonky. also short stroked a smk xs20 [95 clone] made a delrin head for that one ,that on a 26mm piston. that shoots well but not had none of them down since short stroking to see how thay are wearing on the heads, id love to shoot a lazerglide or one of your or bigtoe tunes to see how mine compears and see wot all the fuss is all about
atb john

Hello John, I do lighten my pistons on the 95, 77/97 & short stroke them using an alloy head. This is the last 97 piston i did this week that's 30gms lighter with the short stroke, bearings & seal than a bare standard piston. If you don't mind me saying delrin is not the material to use for piston noses, it will fail in time. Delrin is a good bearing material but doesn't take shock too well.

Generally I short stroke 77/97 in .177 by 8mm, 95's by 12mm, .22's shorter. My own 25mm HW77 in .22 is 68mm with an "O" ring conversion.

Thanks for your comments guys.

I have a couple of .20 HW's to do, a 95 & a nice Green Laminate 77 as well as 2 TX's the later 3 being my own rifles that I hope to bring to the springer bash together with a Diana 280 in .177 & a HW99s that I did the anti gall fix on myself, in a different way to Tinbum! Think I might put some pics up on a new thread of that?

[davidif]

I have a couple of .20 HW's to do, a 95 & a nice Green Laminate 77 as well as 2 TX's the later 3 being my own rifles that I hope to bring to the springer bash together with a Diana 280 in .177 & a HW99s that I did the anti gall fix on myself, in a different way to Tinbum! Think I might put some pics up on a new thread of that?


Look forward to seeing the anti gall fix on the 99s

ATB Dave