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1. 04:05 AM - Re: M-14P Air pump (A. Dennis Savarese)
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| Subject: | Re: M-14P Air pump |
Here's a really good one.=0Ahttp://www.swagelok.com/search/find_products_ho
me.aspx?part=SS-42GF2-A=0ADennis=0A=0A=0A=0A=0A__________________________
______=0A From: Jim Burke <jbyak52@gmail.com>=0ATo: "yak-list@matronics.com
" <yak-list@matronics.com> =0ASent: Sunday, April 20, 2014 9:13 PM=0ASubjec
t: Re: Yak-List: M-14P Air pump=0A =0A=0A=0AWho makes a 1/4 turn dump valve
=C2-=0A=0ASent from my iPad=0A=0AOn Apr 20, 2014, at 4:27, "Richard Goode
" <richard.goode@russianaeros.com> wrote:=0A=0A=0AObviously the power requi
red for the compressor depends on the pressure. But if it is at high pressu
re =93 that is normal operating pressure, when the pressure-release v
alve blows off and then a little later the compressor starts working again
that is all at high pressure, when it uses about 2.5 hp, so not really noti
ceable.=0A>=C2-=0A>But the opening of the release valve does not allow th
e compressor to work off load =93 it has released some pressure, whic
h makes the compressor then work again to build up the pressure in a contin
uing cycle!=0A>=C2-=0A>But the real advantage of opening a "dump-valve" i
s that the compressor then runs off-load for most of the time. In our exper
ience the compressors are a weak part of these engines, and very often do n
ot reach the engine TBO, but if running off-load, they will last indefinite
ly.=0A>=C2-=0A>There is also a side advantage that if the compressor is n
ot continuously working, it's not then putting some atmospheric water into
the air system. Of course this shouldn't happen, but many people don't rele
ase the water drain sufficiently often, and so it goes quite a long way to
prevent this problem.=0A>=C2-=0A>Richard Goode Aerobatics=0A>Rhodds Farm
=0A>Lyonshall=0A>Hereford=0A>HR5 3LW=0A>=C2-=0A>Tel:=C2- +44 (0) 1544 3
40120=0A>Fax: +44 (0) 1544 340129=0A>www.russianaeros.com=0A>=C2-=0A>From
:owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronic
s.com] On Behalf Of Todd McCutchan=0A>Sent: 20 April 2014 02:52=0A>To: yak-
list@matronics.com=0A>Subject: Yak-List: M-14P Air pump=0A>=C2-=0A>How mu
ch HP difference is there between a "loaded" and "unloaded" air compressor
on the M-14P?=0A>=C2-=0A>I have heard of guys putting in a manual "bypass
" dumping air from the compressor overboard to "unload" the compressor for
more HP.=0A>=C2-=0A>I would think this is both=C2-=0A>=C2-=0A>A) mini
mal increase in HP (1 - 2 HP?)=0A>=C2-=0A>And=0A>=C2-=0A>B) once your a
ir is "topped off" doesn't the pressure relief valve or "pop off" valve ope
n and perform the exact same function?=0A>=0A>Todd McCutchan=0A>T-34A & Yak
-50=0A>Cell: (260) 402-1740=0A>E-mail: todd@fastaircraft.com=0A>www.fastair
craft.com=0A>=C2-=0A>=C2-=0A>=0A>On Apr 19, 2014, at 6:24 PM, "A. Denni
s Savarese" <dsavarese0812@bellsouth.net> wrote:=0A>The pop off (pressure R
ELIEF) valve is controlled by spring tension.=C2- The tighter you make th
e "top hat" (turn it clockwise), the higher the pressure goes.=C2- When t
he pressure reaches the preset spring pressure, the valve opens.=C2- The
hiss is the pressure relief which stops when the pop off valve closes.=C2
- This is perfectly normal.=C2- It's just like the pressure relief valv
e on a shop compressor.=C2- If the pressure in the compressor exceeds the
pressure relief valve preset pressure, the valve opens and "dumps" the exc
ess pressure.=0A>>Dennis=C2- =0A>>=C2-=0A>>=C2-=0A>>=0A>>____________
____________________=0A>>=0A>>From:Jim Shanks <shankeroid@verizon.net>=0A>>
>Subject: Yak-List: Hissing Pop-Off Valve=0A>>=C2-=0A>>=C2-=C2-=C2-
=0A>>When servicing the air system on our stock CJ, the pop-off valve begi
ns =9Chissing=9D at around 32 ATM and =9Cpops-off
=9D at around 38 ATM (not allowing system to be pressurized any higher.)=C2
- After popping off and servicing discontinued, hissing will continue (sl
owly diminishing) until pressure settles at around 32 ATM.=C2- Although p
robably plenty for a few start attempts, I want to fix the problem and have
the full 50 ATM available.=0A>>=C2-=0A>>=C2- I know the valve is adjus
table, but is the hissing a separate problem that needs to be addressed?=C2
- Also, what specifically is causing the valve to hiss?=0A>>=C2-=0A>>Th
anks.=0A>>=C2-=0A>>Jim Shanks=0A>>shankeroid@verizon.net=0A>>=C2-=0A>>h
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