Stroke lengths, TP sizes and SCR for various springers...

[brucegill]

Ok, added SCR's for the rifles listed so far......


Can someone check my figures? I'm getting confused! (Have made a spread sheet up so its all automated....)

Looking at the SCR for say the early 77 and the 80, the 80 should shoot nicer than the 77 Or at least it's closer to the preferred 300:1-500:1

I'm guessing Piston weight must be playing a major factor here!

[Snooper601]

Ok, added SCR's for the rifles listed so far......


Can someone check my figures? I'm getting confused! (Have made a spread sheet up so its all automated....)

Looking at the SCR for say the early 77 and the 80, the 80 should shoot nicer than the 77 Or at least it's closer to the preferred 300:1-500:1

I'm guessing Piston weight must be playing a major factor here!

Hi Bruce, its probably worth adding a swept volume column to save calculator punching

The SCR is difficult as the target value depends on port length as the gas flow through the port is restricted more by a longer port, it's an indicator of when it will slam or bounce.

Cheers

John

[bigtoe01]

95/98/new 85 are 85mm stoke, not 86, all depends what seal is fitted obviously

If I get a chance i will boot the old machine up and get my notes off it, however only the stock stuff, not what i set.

[T 20]

however only the stock stuff, not what i set.

I can't blame you for that Tony --- I've just been watching that bloke on you tube who's nicking your ideas.

I've just watched him put grooves in an 80 piston that was running offset in the chuck --- and his Student sounds like a lorry engine with a knock.






All the best Mick

[bigtoe01]

I can't blame you for that Tony --- I've just been watching that bloke on you tube who's nicking your ideas.

I've just watched him put grooves in an 80 piston that was running offset in the chuck --- and his Student sounds like a lorry engine with a knock.






All the best Mick

Some of my idea's even make BAR Mick, not me making them though, my opinion is any end user can make what they like but someone making financial gain from me....play the game and chat to me first

I'm willing to come to agreements, do NOT use my idea's and expect me to not take a dim view.

No more fresh idea's released without protecting them now, shame it has to be that way but it does...even Jim warned me it would happen a while back, should have listened to him me thinks.

[TonyL]

I can't blame you for that Tony --- I've just been watching that bloke on you tube who's nicking your ideas.

I've just watched him put grooves in an 80 piston that was running offset in the chuck --- and his Student sounds like a lorry engine with a knock.

All the best Mick

I haven't looked at the videos........I really ought to.....

[T 20]

I haven't looked at the videos........I really ought to.....

Hi Tone

I recommend buttoning a HW80 piston Part 1 for starters.





All the best Mick

[TonyL]

Hi Tone

I recommend buttoning a HW80 piston Part 1 for starters.

All the best Mick

Cheers, will have a peep!

[TonyL]

Hi Tone

I recommend buttoning a HW80 piston Part 1 for starters.

All the best Mick

By Bosch!! Oh my, I really cannot believe that!

At least I've had a little tonic for the day....that got me laughing!

Boys, you've got nowt to worry about!

[brucegill]

HW99S added. 90% sure the figures are correct....

[tokoloshe]

Walther LGV - new model

Bore - 25mm
Stroke - 88mm
TP - 2.7x27mm
Piston Wt. - 258g

[brucegill]

95/98/new 85 are 85mm stoke, not 86, all depends what seal is fitted obviously

If I get a chance i will boot the old machine up and get my notes off it, however only the stock stuff, not what i set.

Thanks Tony. Amended. I've found a few of the figures from your posts on various forums, but won't put anything up that's not stock.

Any nay figures and help appreciated. Just trying to get my head around it all!

[bigtoe01]

Bruce

I am happy to say I use 3.9mm on 77's, 3.6 on 95's, its just some other springers that I have done I have now decided to keep what I use mum for now so you could quote me on those in the first post. Regards the 95 stroke it all depends on whats seals are used, most i have measured (around 8) have all been 85mm, however add a vortek seal and they are 87mm...

[tokoloshe]

Think caliber size might be important here😉

[brucegill]

Think caliber size might be important here😉

All the above details are the same for every caliber on the stock rifles.... As far as I'm aware.