Thread: Walther venting
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Old 5th May 2014, 09:04 PM
hmangphilly hmangphilly is offline
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Join Date: Nov 2013
Location: wimborne
Posts: 571

Originally Posted by Scooby View Post
How did you carry out the test as if your figures scale up you'd be talking approx 35psi getting past the firing valve stem, I can barely feel any air coming from my dryfire switch
I attached a snap on cylinder leakage tester EEPV309A00 to the muzzle,

probe closed,
air cylinder fitted but only filled to 30 bar
hammer cocked then released against dry fire switch
join tester to air line
adjust the leak tester to 100psi

of course this is a steady 100 psi rather than a sharp blast of 80 odd bar so at this pressure the air has plenty of time to find its way down the stem .
I'm sure the leakage doesn't scale up to any where near 35psi during firing
but you could really hear it quite clearly coming out of the safety hole.
and it does show that there is an appreciable blow by down the stem

if this was a motor I had rebuilt it would be coming apart again without doubt.
i'll see if I can do some pics if you cant picture this test....worth a 1000 words and all that
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