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Re: Power Curves & the Sweet Spot

Posted: Mon Nov 28, 2016 9:09 am
by bullhead
Great info thanx

Re: Power Curves & the Sweet Spot

Posted: Tue Nov 29, 2016 8:25 pm
by what barn door
Or if your a bit handy and have some tools and a good chrono, and you don't want to fit a regulator, you could change or alter the exhaust valve spring and maybe the hammer and it's spring to achieve a slighty improved power curve and shot count, but this is a bit time consuming !

Re: Power Curves & the Sweet Spot

Posted: Fri Dec 30, 2016 7:33 pm
by Backspin66
It seems that every gun has it's personality. My AA S410 .22 has it's sweetspot between 160-105 bar. Don't need a regulator when you know that. Happy New year.

Re: Power Curves & the Sweet Spot

Posted: Thu Jan 05, 2017 4:36 pm
by Mark112
Backspin66 wrote:It seems that every gun has it's personality. My AA S410 .22 has it's sweetspot between 160-105 bar. Don't need a regulator when you know that. Happy New year.

Very true about personality. My carbine .22 has a total spread from 190 bar down to 90 bar of just 19 fps and 98 shots in total. 72 shots of which are within a 10 fps band. I wouldn't bother regulating it as gains are likely to be small. That said my .177s were a different kettle of fish. After regulating my classic I now had 135 shots in a 12 fps window and after letting it settle down and firing a few shots through it I did a 20 shot string just to check power level. This was the result:-

714 712 712 713 715 713 712 713 713 715 714 713 713 712 713 712 714 714 713 713 (thread extract here:- viewtopic.php?f=5&t=3300#p28841)

For me it's a great improvement and well worth the effort although like others I was sceptical about doing it. As you say each rifle is different and some by their very nature will shoot better than others and the gains brought about by regulating will be smaller.

Mark

Re: Power Curves & the Sweet Spot

Posted: Fri Jan 27, 2017 10:27 am
by what barn door
Mark112 wrote:
Backspin66 wrote:It seems that every gun has it's personality. My AA S410 .22 has it's sweetspot between 160-105 bar. Don't need a regulator when you know that. Happy New year.

Very true about personality. My carbine .22 has a total spread from 190 bar down to 90 bar of just 19 fps and 98 shots in total. 72 shots of which are within a 10 fps band. I wouldn't bother regulating it as gains are likely to be small. That said my .177s were a different kettle of fish. After regulating my classic I now had 135 shots in a 12 fps window and after letting it settle down and firing a few shots through it I did a 20 shot string just to check power level. This was the result:-

714 712 712 713 715 713 712 713 713 715 714 713 713 712 713 712 714 714 713 713 (thread extract here:- viewtopic.php?f=5&t=3300#p28841)

For me it's a great improvement and well worth the effort although like others I was sceptical about doing it. As you say each rifle is different and some by their very nature will shoot better than others and the gains brought about by regulating will be smaller.

Mark


Good result mate, which reg did you fit?

Re: Power Curves & the Sweet Spot

Posted: Fri Jul 07, 2017 12:24 pm
by joshreed94576
Love this post helped a lot but ill let my local gun shop do all the testing for me lol.

Re: Power Curves & the Sweet Spot

Posted: Sat Jul 14, 2018 10:35 pm
by long jon
Mark
Thank you a useful post for me who is newish to the sport.

Its a pity I cant seem to open your jpg's praps someone can help?

As I now understand what's going on I can apply your advice as appropriate - I may not want to get down to the fine nitty-gritty but at least I now understand. Well done and tahnsk for taking the time.
Rgds
Jon

Re: Power Curves & the Sweet Spot

Posted: Sun Jul 15, 2018 8:50 am
by TenMetrePeter
Jon when the thread wad started in 2016 we could post .jpgs directly. Since the change of platform all such .jpgs disappeared.

Re: Power Curves & the Sweet Spot

Posted: Sun Feb 16, 2020 4:29 pm
by Pete2
The sweet spot on my 177 s200 is from 155 to 110. It goes from 770 to 790 and back down. Will just increasing the hammer then using the venturi allow me to extend it and make it flatter? I would like it to go from 165 and have a less fps variance.
Or do I need to increase the pot length?

Re: Power Curves & the Sweet Spot

Posted: Sun Feb 16, 2020 8:10 pm
by tonyc
I've not done this on a S200 but have done some adjustments on S400 (valve spring pre-load, venturi and pot length) and Weihrauchs (hammer spring and reg settings). On that basis I would say, to move the peak to higher cylinder pressure you would have to make the pot smaller or the hole in the pot smaller, which would also lower the peak power. Reducing the valve spring pre-load to restore power will increase the sensitivity to cylinder pressure so the curve would be more pronounced. Therefore, you would have to increase the hammer to compensate for loss of power.

Ideally you would set power on the valve/hammer balance with the transfer port unrestricted.

Whether you will end up with more shots is questionable. AA presumably have spent some time optimising the design and setup so any improvements may be marginal.