REFLECTOR:IO-540
Ronnie Brown
reflector@tvbf.org
Thu, 13 May 2004 20:41:24 -0400
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Actually, it is impossible to have anything over 80. "Compression" =
tests on airplane engines is a misnomer. (well actually, you can measure =
more than 80, you crank up the supply pressure to something higher - but =
this incorrect procedure - see below). =20
The rig used to check "compression" is actually a leakage measuring =
device. Pressure is adjusted to exactly 80 psi from a regulator, then =
this air passes through a calibrated orifice. The second gauge reads =
the pressure after the orifice. If the rings, valves didn't leak at =
all, then this pressure would be 80, since there is no flow into the =
cylinder.
With a normal engine, there is always some leakage. A small amount of =
leakage would be seen on a new or low time engine, typically 78,79 psi. =
On a mid time engine, its more like 72-76. On a worn engine, there will =
be lots of leakage and pressures will be below 70. Not good for a =
Lycoming. However Continental on the big bore engines has a new =
procedure that is used to assess the low (55-65 psi) pressures often =
seen on some of their new cylinders/pistons. This involves boroscoping =
and inspecting valves. Continental has blessed lower pressures =
providing the mechanic follows the inspection procedures.
----- Original Message -----=20
From: Dennis Huntington=20
To: reflector@tvbf.org=20
Sent: Thursday, May 13, 2004 8:08 PM
Subject: RE: REFLECTOR:IO-540
Joe
I dont want to insult anyone, but the compressions in the mid to hig =
70's are good. In all my years of working planes, I have never seen the =
compression in the 80's. They may be using a different compression =
gauges. =20
However...the 300 HP engine may be too heavy for the 173. I would =
check with Velocity. I picked the 260 for my xlrg because they told me =
at the time that the weight of the 300 HP would make it hard to keep it =
in the CG
I have thought of removing my 260 HP and converting it to a Cont 550 =
with turbos. I Might be persuaded to sell my engine. It is a Don =
George rebuilt and running great.
Dennis
=20
>From: Joe <jewen@comporium.net>=20
>Reply-To: reflector@tvbf.org=20
>To: reflector@tvbf.org=20
>Subject: REFLECTOR:IO-540=20
>Date: Thu, 13 May 2004 10:00:31 -0400=20
>=20
>I am looking for a used IO-540 for my 173 RG. I have found one for =
sale by Wentworth Aircraft Salvage. It is a used IO-540 K1E5 (300HP). =
The specifics on the engine are - it came out of a Bellanca, it has not =
been in service since 1995 or 1996, it has been stored inside, it has =
1200 hours since new, nitrited cylinders, compressions are 76, 78, 74, =
73, 78, 76, for a cost of about 12K. My greatest concern lies in the =
length of time this has been in storage.=20
>=20
>I appreciate anyone's opinion and / or sources for a used IO-540.=20
>=20
>Thanks,=20
>Joe=20
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<DIV><FONT size=3D2>Actually, it is impossible to have anything over =
80. =20
"Compression" tests on airplane engines is a misnomer. (well actually, =
you can=20
measure more than 80, you crank up the supply pressure to something =
higher - but=20
this incorrect procedure - see below). </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>The rig used to check "compression" is actually a =
leakage=20
measuring device. Pressure is adjusted to exactly 80 psi from a =
regulator,=20
then this air passes through a calibrated orifice. The second =
gauge reads=20
the pressure after the orifice. If the rings, valves didn't leak =
at all,=20
then this pressure would be 80, since there is no flow into the=20
cylinder.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>With a normal engine, there is always some =
leakage. A=20
small amount of leakage would be seen on a new or low time engine, =
typically=20
78,79 psi. On a mid time engine, its more like 72-76. On a =
worn=20
engine, there will be lots of leakage and pressures will be below =
70. Not=20
good for a Lycoming. However Continental on the big bore engines =
has a new=20
procedure that is used to assess the low (55-65 psi) pressures often =
seen on=20
some of their new cylinders/pistons. This involves boroscoping and =
inspecting valves. Continental has blessed lower pressures =
providing the=20
mechanic follows the inspection procedures.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Ddennishuntington@hotmail.com=20
href=3D"mailto:dennishuntington@hotmail.com">Dennis Huntington</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, May 13, 2004 =
8:08=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: =
REFLECTOR:IO-540</DIV>
<DIV><BR></DIV>
<DIV>
<P><BR><BR></P>
<DIV class=3DRTE>
<P>Joe</P>
<P>I dont want to insult anyone, but the compressions in the mid to =
hig 70's=20
are good. In all my years of working planes, I have never seen =
the=20
compression in the 80's. They may be using a different =
compression=20
gauges. </P>
<P>However...the 300 HP engine may be too heavy for the 173. I =
would=20
check with Velocity. I picked the 260 for my xlrg because they =
told me=20
at the time that the weight of the 300 HP would make it hard to keep =
it in the=20
CG</P>
<P>I have thought of removing my 260 HP and converting it to a Cont =
550 with=20
turbos. I Might be persuaded to sell my engine. It is a =
Don George=20
rebuilt and running great.</P>
<P>Dennis</P>
<P><BR><BR> </P></DIV>
<DIV></DIV>>From: Joe <jewen@comporium.net>=20
<DIV></DIV>>Reply-To: reflector@tvbf.org=20
<DIV></DIV>>To: reflector@tvbf.org=20
<DIV></DIV>>Subject: REFLECTOR:IO-540=20
<DIV></DIV>>Date: Thu, 13 May 2004 10:00:31 -0400=20
<DIV></DIV>>=20
<DIV></DIV>>I am looking for a used IO-540 for my 173 =
RG. I have=20
found one for sale by Wentworth Aircraft Salvage. It is a used IO-540 =
K1E5=20
(300HP). The specifics on the engine are - it came out of a =
Bellanca, it has not been in service since 1995 or 1996, it has been =
stored=20
inside, it has 1200 hours since new, nitrited cylinders, compressions =
are 76,=20
78, 74, 73, 78, 76, for a cost of about 12K. My greatest =
concern=20
lies in the length of time this has been in storage.=20
<DIV></DIV>>=20
<DIV></DIV>>I appreciate anyone's opinion and / or sources for a =
used=20
IO-540.=20
<DIV></DIV>>=20
<DIV></DIV>>Thanks,=20
<DIV></DIV>>Joe=20
<DIV></DIV></DIV><BR clear=3Dall>
<HR>
<A href=3D"http://g.msn.com/8HMBENUS/2737??PS=3D47575">Stop worrying =
about=20
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_______________________________________________ To change your email =
address,=20
visit http://www.tvbf.org/mailman/listinfo/reflector Visit the =
gallery!=20
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archives:=20
www.tvbf.org/pipermail Check old archives:=20
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