Just had a play with my .22 HW80, the one I short stroked to 68mm with rotating piston. Power was always going to be a problem at that stroke .22 so decided to reduce the stroke even more.
Piston weight 284grms, bit heavy, pre-load 60mm, transfer port 3.6mm std lth.
Now getting Superdomes @ 588fps 11.04fpe
H&N FTT @585fps 11.8fpe
AA DField @557fps 10.95fpe
Hobby @641fps 11.09fpe
Firing cycle nice, soft but quick, pre-load is a little high, Vo very consistant so inclined to leave as is.
Any advice chaps? Oh the stroke? 48mm
Last edited by wonky donky; 24-02-2015 at 12:02 AM.
May today be the best day of your life and all your tomorrows even better!!
Bring it to the bash please Dave
Amazing.!!!!
P.p.
David the spring is 3.25 wire....14 i/d.....f/l 248 Pe-load 62mm 34.5 coils closed & ground.
There is a 2mm thrust washer on the guide which itself fits into a 2.5mm recess in the trigger block.
The top hat has a 5mm base witha 10mm stem. the piston has some slip washers inside now bringing the weight up to 308 grams with the seal & top hat. I made the slight change to pre-load just to see if Vo responded as per normal or if it was beginning to become over sprung,...Not a bit of it!
Vo is now 595/600fps with H&N FTT .22 5.52mm
Consistency is very good 4/6 fps
I'm running the old type seal, I did try the new type with a huge loss in Vo cica 200fps.......I'm not surprised by this, well maybe a little but found the old seal to give better results in the 80.
If you need anything else give me a shout!
Last edited by wonky donky; 26-02-2015 at 11:21 AM. Reason: Number of coils
Blimey!
Nice one, Mr Wonky!
That sounds awesome. Would love a go at the Bash if that's okay?
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 4/5, 2024.........BOING!!
48mm stroke...love it! I ran one of mine a few years back at 55mm stroke and it produced over 12 with ease
That has to have a seriously fast shot cycle...interesting about the seal, I have some Vortek (vac 30) seals and maccari (flat faced) seals here, if you want to try them just shout at me
Last edited by bigtoe01; 26-02-2015 at 10:30 AM.
What a brilliant idea.......setting the thrust washer into the trigger block to give more room.
What diameter is the piston itself Dave?
http://s202.photobucket.com/user/won...tml?sort=3&o=3
thats off Daves photobucket, its the piston in his 80
30mm seal,