The Craftmans Shop > Backyard Ballistics

Spring air rifles

(1/5) > >>

doubleboost:
Hi
Is anyone up to speed on tuning air rifles
My son has a bsa 22 that is way down on power
John

Jonny:
Depends what you mean by tune, most if not all are just a spring replacement, seal, under body car sealant and grease.
Even the world renowned pros use a form of sound dampening but this poses a few problems with power. Usually take time to warm up to reach max power, so many shots on then goes down in power.
Likewise cold it will shoot lower power, ot higher power.

Not a master but took my old mark 1 TX200 in to what was the old Venom shop 17 years ago.
Came away with a HW power pulse seal and modded piston to accept it.
Whilst there one served me went in back whilst the other two came out for a look - Within 3 months the Ultraglide was released!

Nothing new here but bored out end block and swaged spring guide in to it. Guide accordingly sized so that the spring had to be expanded and twisted on, no one to date has done.
Apart from the normal bearings and weights on guide and in piston no lubricants used! No grease nothing - not a hint of resonance but more so speed went up a good 70ft/sec and stable over a wide temp range.

There are a lot of misinformed falasies all copying each other like lemmings and getting no where. Delrin spring guides is one.
 
Which BSA you got?
I have a Goldstar from 94 duly shortened collecting rust the last 17 years, TX above is show grade in bits took apart to make an anglo US rifle and need to put back together 10 years on.

doubleboost:
It is a bsa lightning
I have been looking around the web at gas struts
But with the machinery at my disposal i am sure i could cobble something up
Has the transfer port size much bearing on things
John

Jonny:
Its been a long time but did experiment with interchangeable screw in sleeves on an HW80, around 1991.
Think the min was 2.5mm p to 1/8" - 3.5mm showed no gains and piston started slamming down.

doubleboost:
I took it apart and found the spring was broken in to 3 pices .
I polished the cylinder made a new guide tube cleaned all the burs and score marks up.
New seal and spring some drive shaft grease .
The change is amazing nice and smooth with plenty of power (i managed to restrain myself from fitting piston weights and spacer washers).
as it is it will be pushing the legal limit
Playing with this has wet my apatite i am starting to fancy a HW80 (that seems to be the spring gun to tune)

Navigation

[0] Message Index

[#] Next page