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The flex sections are necessary because the engine moves on its mounts in r=
elation to the chassis. and that would stress and destroy a solid exhaust c=
onnection. The rubber exhaust hangers don't have enough flex to compensate =
for the movement and would similarly be stressed. If the flex sections were=
to freeze in place all of the stress caused by the engine rocking and vibr=
ation would be transferred to the exhaust flange joints and/or the rubber m=
ounts.
Most modern cars compensate by allowing some freedom of motion in the exhau=
st hangers, although some still have some form of flexible joint in the sys=
tem.
Bill Lawrence
BN1 #554
________________________________
From: Perry <healeyguy@aol.com>
Sent: Friday, October 18, 2019 1:02 PM
To: healeys <healeys@autox.team.net>
Cc: WILLIAM B LAWRENCE <YNOTINK@msn.com>
Subject: RE: [Healeys] Fwd: Down pipes
Bill brings up something that I have thought about occasionally over the la=
st 50 years, why is there a section of flex pipe used in the original produ=
ction of Austin Healey=92s? I mention production because I=92m not sure wh=
at was on the first prototype cars. Todays stainless or mesh type flex pipe=
does actually move even after the pipe has =93aged=94 a bit. Not so much f=
or the older mild steel versions. Once they take a set (rust) there is not =
much movement, but usually breakage.
My take on the flex pipe on Austin Healey is that it makes it a lot easier =
to fit the pieces together on the car. Exhaust manifold outlet(s) are fixed=
points. Same with the inlet(s} to the muffler. To get a perfectly parallel=
set of down pipes outlets into the muffler and still fit the exhaust manif=
old would be hard without the flex pipe sections. Note that the factory wel=
ded the two tail pipes together on the later 100-Six/early 3000.
OK I=92m going back to sleep. Perhaps I=92ll dream about why the oil drips=
out of my gearbox/OD even with fresh =93O=94 rings=85.
Perry
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=3D550986> for Window=
s 10
Sent: Friday, October 18, 2019 12:50 AM
.net>
Subject: Re: [Healeys] Fwd: Down pipes
The rubber mounts shouldn't cause a problem, but the flexible sections of t=
he down pipes may have become too stiff to flex, in which case the relative=
motion of the engine to the chassis may be transmitted to the down pipe fl=
anges.
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<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
The flex sections are necessary because the engine moves on its mounts in r=
elation to the chassis. and that would stress and destroy a solid exhaust c=
onnection. The rubber exhaust hangers don't have enough flex to compensate =
for the movement and would similarly
be stressed. If the flex sections were to freeze in place all of the stres=
s caused by the engine rocking and vibration would be transferred to the ex=
haust flange joints and/or the rubber mounts.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
Most modern cars compensate by allowing some freedom of motion in the exhau=
st hangers, although some still have some form of flexible joint in the sys=
tem.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
Bill Lawrence</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
BN1 #554</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Perry <healeyguy@a=
ol.com><br>
<b>Sent:</b> Friday, October 18, 2019 1:02 PM<br>
<b>To:</b> healeys <healeys@autox.team.net><br>
<b>Cc:</b> WILLIAM B LAWRENCE <YNOTINK@msn.com><br>
<b>Subject:</b> RE: [Healeys] Fwd: Down pipes</font>
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<p class=3D"x_MsoNormal">Bill brings up something that I have thought about=
occasionally over the last 50 years, why is there a section of flex pipe u=
sed in the original production of Austin Healey=92s? I mention produc=
tion because I=92m not sure what was on the
first prototype cars. Todays stainless or mesh type flex pipe does actuall=
y move even after the pipe has =93aged=94 a bit. Not so much for the older =
mild steel versions. Once they take a set (rust) there is not much movement=
, but usually breakage.
</p>
<p class=3D"x_MsoNormal">My take on the flex pipe on Austin Healey is that =
it makes it a lot easier to fit the pieces together on the car. Exhaust man=
ifold outlet(s) are fixed points. Same with the inlet(s} to the muffler. To=
get a perfectly parallel set of down
pipes outlets into the muffler and still fit the exhaust manifold would be=
hard without the flex pipe sections. Note that the factory welded the two =
tail pipes together on the later 100-Six/early 3000.
</p>
<p class=3D"x_MsoNormal">OK I=92m going back to sleep. Perhaps I=92ll=
dream about why the oil drips out of my gearbox/OD even with fresh =93O=94=
rings=85.</p>
<p class=3D"x_MsoNormal">Perry</p>
<p class=3D"x_MsoNormal"> </p>
<p class=3D"x_MsoNormal">Sent from <a href=3D"https://go.microsoft.com/fwli=
nk/?LinkId=3D550986">
Mail</a> for Windows 10</p>
<p class=3D"x_MsoNormal"> </p>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"x_MsoNormal" style=3D"border:none; padding:0in"><b>From: </b><a=
href=3D"mailto:ynotink@msn.com";>WILLIAM B LAWRENCE</a><br>
<b>Sent: </b>Friday, October 18, 2019 12:50 AM<br>
<b>To: </b><a href=3D"mailto:eyera3000@gmail.com";>i erbs</a>; <a href=3D"ma=
ilto:bspidell@comcast.net">
Bob Spidell</a><br>
<b>Cc: </b><a href=3D"mailto:healeys@autox.team.net";>Ahealey help</a><br>
<b>Subject: </b>Re: [Healeys] Fwd: Down pipes</p>
</div>
<p class=3D"x_MsoNormal"> </p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:12.0pt; color:black">The =
rubber mounts shouldn't cause a problem, but the flexible sections of the d=
own pipes may have become too stiff to flex, in which case the relative mot=
ion of the engine to the chassis may
be transmitted to the down pipe flanges.</span></p>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-size:12.0pt; color:black">&nbs=
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