I'm really starting to think that these 21/22mm bores with their longer strokes...

[rockdrill]

Probably a good thing that it is so detectable as it saves more messing around.

From your list the 24mm looks to be interesting - would be intrigued to see how it performs in .177.

[Shed tuner]

Probably a good thing that it is so detectable as it saves more messing around.

From your list the 24mm looks to be interesting - would be intrigued to see how it performs in .177.

You coming to the bash ?

In .20 with an 11" barrel it makes 12FP easy - a little too easy - with 85mm stroke. It's an HW80 so barrel swaps are easy Even as is (detuned to 11), with a straight swap for a 14" .177 barrel I'd expect it to also make 10.5 - 11 And if it needs more, an extra 2-3mm preload will bring it up over 11 easy.

The 80's port is around 11mm long, so would be even more efficient in a TX / 97 / 77

Rgds - JB

[rockdrill]

Unfortunately not - I would like to get along to one of these but they always seem to fall at awkward times for me.

[TonyL]

Maybe I need to try 23.5 ?

Do it!

[BTDT]

Congratulations to Jim on another excellent article in the latest AGW, including this very subject.

Also to Tony on his boinger article in the same issue.

Boingers are the new cool airguns.

Cheers

John

Thank you, John. Praise from someone with an engineering background is praise indeed.

Good to see Tony singing the praises of the springer. Hopefully, his enthusiasm will prove as infectious as it is unbounded, and PCP users will be inspired to add a springer to their airgun collection.

[Snooper601]

Thank you, John. Praise from someone with an engineering background is praise indeed.

Good to see Tony singing the praises of the springer. Hopefully, his enthusiasm will prove as infectious as it is unbounded, and PCP users will be inspired to add a springer to their airgun collection.

Your welcome Jim, your articles are just what we need to keep the general airguning population aware that things can and will be improved over the bog standard 'as purchased' airguns.

What's your take on the o-ring seals being more prone to dieseling compared to parachute seals?

Cheers

John

[BTDT]

Your welcome Jim, your articles are just what we need to keep the general airguning population aware that things can and will be improved over the bog standard 'as purchased' airguns.

What's your take on the o-ring seals being more prone to dieseling compared to parachute seals?

Cheers

John

To be honest, John, without testing pistons fitted with o ring seals, I can't say for sure, and I'm loathe to speculate.

[Snooper601]

To be honest, John, without testing pistons fitted with o ring seals, I can't say for sure, and I'm loathe to speculate.

I can see an article coming where TX type seals are compared to HW style and o-ring types to see which might be best for various requirements, accuracy, power, efficiency, consistency, hold sensitivity, propensity to diesel and shot cycle.

Cheers

John

[Gecko]

Dont know the wieght of these small bore pistons but what about making a deadblow piston/piston rod?

[TonyL]

Congratulations to Jim on another excellent article in the latest AGW, including this very subject.


Cheers

John

Got it today!

And, I must say, this has got to be one of the most, if not THE MOST, bestest articles ever on springer tuning, even going by Jim's consistently high standards and supreme knowledge.

An absolute classic, thanks, Jim.

And for anyone vaguely interested in springer dynamics, an absolute must read.

[prosport.177]

Dont know the wieght of these small bore pistons but what about making a deadblow piston/piston rod?

My full bodied 22mm piston is 152grams with t hat..

[TopDog]

I forgot how far "north" you are - I can recommend a decent B&B very closeby if you want top ensure a decent night's rest with all that travelling...

Hi Jon

Thanks for that but I would stay with friends in Kettering if I came down just to split up the journey. Problem is fully booked Saturday and the other guys I want to talk with would only be there on Saturday!

Maybe next time I can get up to speed earlier!

atvb
David

[Shed tuner]

My full bodied 22mm piston is 152grams with t hat..

My 22mm bodiless is about the same...
the 23mm (body) is around 170
the 24 is around 180
25s are around 200

[ART1969]

Agreed, although I'm slightly surprised that's it's so "detectable" within a fairly small variation of those parameters;
- 26mm OK (slightly hold sensitive) and a little too much recoil / surge
- 25mm good but can be a little "aggressive"
- 24mm very good and quite soft
- 23mm very good and soft
- 22mm OK (slightly hold sensitive) and very soft

Have you compared any of these to going down the more conventional route of short stroking an 80? Limiting hold sentitivity and consistancy would be the goal. My Mk3 TX seems much more stable on firing with a Tinbum short stroke head extension.

[TonyL]

Have you compared any of these to going down the more conventional route of short stroking an 80? Limiting hold sentitivity and consistancy would be the goal. My Mk3 TX seems much more stable on firing with a Tinbum short stroke head extension.

At the very first Boinger Bash, Wonky Donky brought along a short stroke '80. I seem to recall that the stroke was 55mm and I also seem to think it had a lightened piston; don't think it was running piston bearings.

It shot beautifully!

Barely distinguishable from a 25mm sleeved one.. ----- Obviously just going on perceived feel here, it would need a rig such as discussed above to measure for sure.

So, assuming for a second that it yielded similar results, the short stroke and standard bore would entail far less work.

But we love it when these shed tuner techies play around!