Author Topic: tx mk3 177 tin bum short stroke.  (Read 5079 times)

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Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #10 on: May 19, 2016, 10:14:44 PM »
lgv pistons a fair bit abit heavier
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Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #11 on: May 19, 2016, 10:44:20 PM »
word on the street is  ::) :) ''titan no7'' should fit with a bit of shortening, also mk2 spring without collapsing it a little might also be over egging it.

  What has been suggested and I see the logic of this is just try the original steel top hat , that could lift the velocity a little . Anyway I don't really know what I'm talking about so i'll shut up.
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Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #12 on: May 20, 2016, 09:38:58 PM »
Shot maybe 250 pellets up to press.

 Also been testing  3 jsb made pellets for consistency and power, all are  consistent. An looking at the figures there's no point in messing with springs etc as it's powerful enough.
falcons 801fps 10.56lb                                                                      aaf express  781 fps 10.7lb 
aaf 747 fps  10.53lb 

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Offline landymick

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Re: tx mk3 177 tin bum short stroke.
« Reply #13 on: May 21, 2016, 10:22:43 AM »
Its sounds ok then,the other reason for changing springs apart from power issues is to make cocking easier or help with reducing slam.

In one of my HW35's  a square section spring a coil shorter than the standard is harder to cock & gives a quicker firing cycle but it feels horrible & produces less power.Fitted a longer than standard spring with smaller wire di & it was easy to cock,softer shooting & power up a bit. :)
     
Just saying like you may get a better result with different spring but if its nice now i'd probably leave it as well. :D

Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #14 on: May 21, 2016, 11:03:57 AM »
I had a nasty hw80 with square spring in it, it would shoot through both sides of my dads shed  ;D. It'd turn rats inside out :).

 
''Just saying like you may get a better result with different spring but if its nice now i'd probably leave it as well. :D''
 Well it feels ok for the brief times I've used it but.. :) but I really would like to try a different spring of some sort.But I'm not sure how or who to source a suitable spring and guides from, any ideas?
 
 
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Offline Gambo

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Re: tx mk3 177 tin bum short stroke.
« Reply #15 on: May 21, 2016, 02:45:00 PM »
I'm not sure how or who to source a suitable spring and guides from, any ideas?

A Venom/V-Mach Powr-Lok spring from Steve Pope. ;)

Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #16 on: May 21, 2016, 04:34:40 PM »
Cheers mucker.

 Just fitted a freshly acquired titan no10, I won't bore you with the exact dimensions,unless anybody else has  got a tx here, but suffice to say it's lighter gauge wire with a slightly smaller inside diameter and 1 coil and 10mm longer  than the standard spring . It fits the tinbum top hat just,but doesn't fit the tinbum guide and also too tight on the previous steel guide but it fits perfectly snug an older tx steel spring guide from the spares box .

 So new spring longer and weaker maybe and 2 power washers removed it's lifted it approx 40fps .
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Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #17 on: May 21, 2016, 05:04:55 PM »
No not 40fps about 15,sorry .
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Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #18 on: May 22, 2016, 10:23:40 AM »
Err wrong again, ;D
 those pesky minscule 177 pellets all look the bloody same,jsb need to start painting the 7.4 ,7.9and 8.5 all different colours so us old fogeys can tell them apart,bastards they are.

 Soo,aafield express 7.9, the connoisseurs choice,   are now  whizzing along at795-810 fps.  Not particularly consistent but I've really skimped on the lube and the steel spring guide might benefit from a repolish.So that's maybe worth a revisit in a tinsworth of pellets time depending.I've a new type of spring lube on it's way for free :) :) that I may use in the very near future aswell;) :).

Before the short stroke , the compression chamber was very forgiving of  lube migration off the  spring etc and would tolerate  a little grease upfront without dieseling, I believe this could be partially due to the aa piston seal wasting a little space, not so with hw seal on piston head. So I've left titan spring dry as a bone apart from the last inch or so on the spring guide. No twang or buzz at all as yet.

 Overall does it feel better or vastly different than before?  :)Yes. Much quicker and doesn't feel swooshy/pumpy.Almost like walther lgu but much less movement, I do notice I sometimes get a glimpse of the pellet as it passes through the focus,i never did before.
 I've read some internet stuff regarding hold sensitive ness of mk3tx, I never found it obtrusive, but I suppose they are a tiny bit, cause now I notice I can zero off my hand rested on  a bag and the pellet still runs true where as before it would drift up and to the right when shooting offhand, these things I must have compensating for without consciously being aware of it, but after you've been using the gun for years these things do become abit invisible . Strange eh. Overall short stroking tx with tinbum kit extremely effective, it really does work like he says on the advert.

 If I was going to do it again, I would have read up more on theory of how and why springers do what they do,you know all that spring rates,transfer ports ,swept volumes etc-it's fascinating. And I think I would have gathered a collection of springs for experimenting with.
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Offline seagate

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Re: tx mk3 177 tin bum short stroke.
« Reply #19 on: May 23, 2016, 06:54:30 PM »
''Also been testing  3 jsb made pellets for consistency and power, all are  consistent''  that's not quite right, after shooting some maximum range spinners yesterday I see vertical stringing marks in the paint.

 Had the gun apart for inspection,nothing obviously wrong,quite frustrating

 But sussed it out tonight , found what was wrong with it ,I'm quite surprised what the easily remedied problem was. Now all's well.
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