Springer Tuning Projects.

[maximus]

On the power subject.
My pro compact full length has been tuned down to 10.6 with express and domes are 9-9.5 easy to cock
the first K I bought is doing 11.2 with superdomes and just marginally less with express. I think its over sprung.
The second K i have is a sandwell one. Producing 11.7 with express and 11 with superdome. Cocking is easy.

If yours is reading highest with superdome I'd think that its also oversprung and cocking effort could be reduced

You could be right, I have contemplated chopping a bit off the spring for that very reason but was bothered about it just reducing the power and being left with a spring that was too short! I added weight back into the piston via a brass top hat and washers, it shoots nice enough though I cant stop the spring from twanging totally despite having tight fitting guides and piston sleeve. Might be a twangy spring or could be a bouncy piston. I may try a different spring one day but all I have in my spring stash are various cut down titan no.1's which all seem to stiff when in and definitely over spring the action. I like the Dianas though and they are usually what I reach for when I want a shot these days.

[robs5230]

You could be right, I have contemplated chopping a bit off the spring for that very reason but was bothered about it just reducing the power and being left with a spring that was too short! I added weight back into the piston via a brass top hat and washers, it shoots nice enough though I cant stop the spring from twanging totally despite having tight fitting guides and piston sleeve. Might be a twangy spring or could be a bouncy piston. I may try a different spring one day but all I have in my spring stash are various cut down titan no.1's which all seem to stiff when in and definitely over spring the action. I like the Dianas though and they are usually what I reach for when I want a shot these days.

Just dropped a 4mm preload washer out of this what I was thought over sprung K. Now doing 11.2 with Express. Not tested domes yet. I have to chop spring now which has compressed coils both ends. Easier to cock and will be even easier yet when sorted. Power will still rise with express.

[maximus]

Just dropped a 4mm preload washer out of this what I was thought over sprung K. Now doing 11.2 with Express. Not tested domes yet. I have to chop spring now which has compressed coils both ends. Easier to cock and will be even easier yet when sorted. Power will still rise with express.

Hmm, might have give my spring the chop then! Currently it's the factory item but with the extra preload of the top hat and thrust washer.

[robs5230]

Hmm, might have give my spring the chop then! Currently it's the factory item but with the extra preload of the top hat and thrust washer.

Steady as you go Max.
My goals are not necessarily yours.
I purposely set my springers as I do to be more efficient with express. Check accuracy with express before you chop.
And if you do, chop carefully. You end up in fine territory with a very small amount of change making a big difference.

On another note. The seal in this 280 is black. I thought they were all blue. So thats me corrected

[Barryg]

On another note. The seal in this 280 is black. I thought they were all blue. So thats me corrected

Vortek
http://vortekproducts.com/ourstore/Diana_Piston_Seal

[robs5230]

Vortek
http://vortekproducts.com/ourstore/Diana_Piston_Seal

Yep thats the one.
thanks