i have a bsa super sport now for about a year but it is only doing about 500fts in .22 cal i want to get a lot more poer out of it like 1000+ fts, does any1 now how i can get this?
well its hard to even contemplate 1000fps in .22 ..you are talking 30+fpe !!.
The full power super sport (PAL Version) does about 650fps in .22 for about 13.5 -14 fpe.You do need a pal to possess one In Canada ..or its an offence under the Canadian criminal code .
Study for the PAL and Keep it legal , tuneing it may be the easy part ..explaining to the officer why you have no pal for a pal rated gun is much harder.
i have heard by adding piston weights and drilling the air hole that goes to the barell can increase power my mates gun (hw 80) is doing 31 ft/lb by adding piston weights and a qxspring
I wouldn't recommend messing with the transfer port on your SS
March 21 2005, 11:55 PM
Here's the thing. I've heard of opening up the transfer port on the Supersport (but only a little) to get the last extra bit of power out of that particular gun but you better know what you are doing or you'll end up with LESS power. What you're looking for is a fine balance between maximum airflow and minimum transfer port volume. If that transfer port is too large, the piston, no matter how much weight you add, won't be able to achieve max pressure before the piston slams into the end of the compression chamber. Think of an extreme case, what if the volume of the transfer port was the same as the volume of the piston? In that instance, the max pressure you could EVER achieve would by 2X atmospheric pressure or 14.7x2= 29.4psi and you'd be lucky if the pellet got out the barrel. If you open up the transfer port too much, all that happens is you get piston slam and wasted energy. Adding mass to the piston can improve power to some extent, but again there is a trade-off point beyond which you get no additional benefit. Take another extreme example, what if you could add 10lb of mass to the piston? The spring would move it so slow that the pellet would just leave the barrel before max compression could be reached and, again, you'd waste most of the energy. I won't dispute that your friend may have achieved a fabulous results with his HW80 because you didn't mention what spring, mass, transfer port size, etc. etc. etc. that he used and I'm not real familiar with that particular gun...but I own a couple of Supersports and a couple of SuperStars (same powerplant) and I've experimented with some of them and I'd be really surprised if you can get more that 16fpe out of that particular gun...and if you do, I'll be even more surprised if the firing behavior isn't harsh and absolutely astounded if something doesn't break in short order because of being pushed far beyond one or more of the gun's design limits. Realistically, you should be able to get around 650 fps out of that gun with 16 grain pellets and maybe up to 750 fps with very light pellets.