I don't believe a TP smaller than 3.0mm ever works in a 12FP springer....

[Shed tuner]

My Webley Xocet has a 2.6mm transfer port and produces power easily...

I bet if you opened it up to 3.0 it would produce power more easily / more efficiently / with less recoil and cocking effort

[Phil Russell]

I am following this topic with interest as there is much excellent information here. I well remember the debate over the LGU TP and how it was best to open it out to 3.2mm for a better performance and, if I remember correctly, to avoid stress on the factory fitted mainsprings.
But I digress. In reading these posts, someone could be forgiven for thinking that manufacturers have got it all wrong ... usually using TPs that are too narrow or, in some cases, too wide for peak efficiency. I have been pondering why this is ... There are several explanations amongst which is the possibility that the manufacturer chooses a TP size without any real research into its performance; a case of 'oh, that'll do'. Or the chosen size may be a production based compromise to use one size for different markets rather than matching a size to a particular market. Did not Walther do that with the LGU with the TP for the USA market being larger than that for Germany (and the UK)? Or maybe the manufacturer tries to provide a solution by using a TP restrictor (K98?).

Thank heaven for people like those on here who do the hard work for us.

Cheers, Phil

[hmangphilly]

I am following this topic with interest as there is much excellent information here. I well remember the debate over the LGU TP and how it was best to open it out to 3.2mm for a better performance and, if I remember correctly, to avoid stress on the factory fitted mainsprings.
But I digress. In reading these posts, someone could be forgiven for thinking that manufacturers have got it all wrong ... usually using TPs that are too narrow or, in some cases, too wide for peak efficiency. I have been pondering why this is ... There are several explanations amongst which is the possibility that the manufacturer chooses a TP size without any real research into its performance; a case of 'oh, that'll do'. Or the chosen size may be a production based compromise to use one size for different markets rather than matching a size to a particular market. Did not Walther do that with the LGU with the TP for the USA market being larger than that for Germany (and the UK)? Or maybe the manufacturer tries to provide a solution by using a TP restrictor (K98?).

Thank heaven for people like those on here who do the hard work for us.

Cheers, Phil

Quick and easy way to restrict power for their none core markets .

[TORNADOS7]

I bet if you opened it up to 3.0 it would produce power more easily / more efficiently / with less recoil and cocking effort

Had considered it buddy, biggest change in shot cycle has been removing weight from the piston, standard it's 273grms, currently 255, looking to reduce a little more yet though...

I hadn't shot it for a while since the weight reduction but picked it up the other day and all the kick that I'd come to expect has all but disappeared...

Shoots/feels better than my .22/95k now...

[Shed tuner]

Had considered it buddy, biggest change in shot cycle has been removing weight from the piston, standard it's 273grms, currently 255, looking to reduce a little more yet though...

I hadn't shot it for a while since the weight reduction but picked it up the other day and all the kick that I'd come to expect has all but disappeared...

Shoots/feels better than my .22/95k now...

255g is a good improvement - what are these 27 or 28mm cylinder ?

[TORNADOS7]

255g is a good improvement - what are these 27 or 28mm cylinder ?

27mm buddy, looking to get the piston down to around 240, the spring is the main issue with these really (Pow-R-Lok F1) as they were well oversprung from the factory...

[evert]

I've had great results with only a softer spring in the Vulcan. The heavy piston and the narrow transfer port seem to balance out nicely.

[TORNADOS7]

I've had great results with only a softer spring in the Vulcan. The heavy piston and the narrow transfer port seem to balance out nicely.

The shot cycle on the Xocet is quite horrific as standard but as I said I seem to be getting good results just by removing weight from the piston, 273grms is heavy, I’ve also been able to reduced preload as a result, currently running pretty much smack bang on 11, hoping to lose a bit more off of the piston yet whilst maintaining 11’s…