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Post by Who? on Sept 7, 2022 12:38:11 GMT
I delved into the darker recesses of my gun cabinet at the weekend. I keep my guns in the silicon impregnated socks, which has led to my S400 going unnoticed for a few years. It was seeing Chris M that reminded me I had one. Last time I used the S400, while very consistent fps, the shot count was about 20 . I could feel the puff of air coming out the bolt block. As, at the time, I'd just got an HW100, the S400 was just put away. So, four/five years on I'm taking it apart. Well, what I eye opener! At the time, I spent an age 'balancing' the hammer/valve spring/TP grub screw after installing a Lane regulator, the result was as flat power curve and about 90 shots. But, when I took it apart this time I was dumbfounded to see the grub screw that restricts the transfer port was all but blocking it - wtf? Now, along with replacing all the o-rings I'm going to sort out this transfer port restriction. I've forgotten how to balance it - probably a damn good thing, based on what I ended up with last time (although the fps and shot count was good). Anyone with an idea how to set up an S400 with a Lane regulator?
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Post by Bri M on Sept 8, 2022 19:02:20 GMT
As an (unregged) AA S400F owner, I'm not in a position to help out but your post looked lonely so I thought I'd keep it company.
Your 90 shot count is a good 20 more than my bog standard '400 manages but I get bored with PCP shooting long before it runs out of puff.
Not much help but there you go.
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Post by paulthengine on Sept 10, 2022 20:17:14 GMT
Transfer port grubscrew was never a good way of controlling power cos the air ( quantified by hammer spring and valve spring pot) has already left the valve and is then slowed/restricted by the transfer port screw,making the pulse of air longer and wasting air. Most rifles, when regulated, enlarge the transfer port (easy on a BSA cos its a little brass tube,on S400 it`s a drilling in the action block)I would start by backing the transfer port screw untill it don`t restrict the transfer port and then fiddle with valve spring pot and hammer spring. Of course this means taking the rifle apart LOTS of times, testing and tweaking again. Much easier for the manufacturer to build the rifle,adjust the screw to get the right power,and snap off an anti tamper screw over the top. Best of luck with your experiments, I have found it best to incant over the gun at full moon with a glass of Whiskey in right hand and a 2lb lump hammer in left ( Or you could just watch ALL Robert Lanes videos on YouTube
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