REFLECTOR:Problem mounting engine to firewall
KeithHallsten
reflector@tvbf.org
Sun, 23 May 2004 22:56:35 -0700
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The shims sound like a good idea. I would use a full-circular washer as =
each shim - I've seen others cut the side of the washer away so the shim =
could be slipped in without removing the bolt, but this never seemed =
like a good idea to me!
Keith Hallsten
=20
----- Original Message -----=20
From: Kufalk=20
To: reflector@tvbf.org=20
Sent: Sunday, May 23, 2004 9:04 PM
Subject: REFLECTOR:Problem mounting engine to firewall
I just drilled the 5 holes in my XLRG's firewall to mount a Lycoming =
IO-540. I paid particular attention to getting the height correct. I =
didn't want the engine sagging below center like most of the Velocitys I =
have seen. The plans say to hang the engine 1/4" to 3/8" above center =
to account for the flex in the rubber mounts. I wanted mine a little =
higher than that to make up for additional sagging over time. I hung =
mine 7/16" above center. I drilled the holes, installed the bolts, took =
the hoist off and reinstalled the cowling to check the height. I was =
very surprised to find the center if the crank 1/4" BELOW center! I am =
not sure why this happened. The only thing I can think of is that I =
didn't have all 5 pads tight against the firewall when I drilled the =
first hole. The stainless may have been bowed out slightly on the =
bottom.
=20
So does anyone have any idea how to fix this? I was thinking about =
putting shims under the bottom pads to tip the engine up enough to make =
up the difference. I calculate a 0.207" shim under the bottom pads and =
0.069" shim under the top outside two pads. This would tip the engine =
0.8 degrees up and put the crank in center of the hole.
=20
Good or bad idea?
=20
Darrell Kufalk
Waukesha, WI
=20
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<DIV><FONT face=3DArial size=3D2>The shims sound like a good idea. =
I would use=20
a full-circular washer as each shim - I've seen others cut the side of =
the=20
washer away so the shim could be slipped in without removing the bolt, =
but this=20
never seemed like a good idea to me!</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Keith Hallsten</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=3Dltr=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=3Dkufalk@wi.rr.com =
href=3D"mailto:kufalk@wi.rr.com">Kufalk</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> Sunday, May 23, 2004 9:04 =
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> REFLECTOR:Problem =
mounting=20
engine to firewall</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: Arial">I just drilled the 5 holes in my XLRG=92s =
firewall to=20
mount a Lycoming IO-540.<SPAN style=3D"mso-spacerun: yes"> =
</SPAN>I paid=20
particular attention to getting the height correct.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>I didn=92t want the engine =
sagging below=20
center like most of the Velocitys I have seen.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>The plans say to hang the =
engine 1/4=94=20
to 3/8=94 above center to account for the flex in the rubber =
mounts.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>I wanted mine a little =
higher than=20
that to make up for additional sagging over time.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>I hung mine 7/16=94 above =
center.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>I drilled the holes, =
installed the=20
bolts, took the hoist off and reinstalled the cowling to check the=20
height.<SPAN style=3D"mso-spacerun: yes"> </SPAN>I was very =
surprised to=20
find the center if the crank 1/4=94 BELOW center!<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>I am not sure why this =
happened.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>The only thing I can think =
of is that=20
I didn=92t have all 5 pads tight against the firewall when I drilled =
the first=20
hole.<SPAN style=3D"mso-spacerun: yes"> </SPAN>The stainless may =
have been=20
bowed out slightly on the bottom.<o:p></o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: Arial">So does anyone have any idea how to fix =
this?<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>I was thinking about putting =
shims=20
under the bottom pads to tip the engine up enough to make up the=20
difference.<SPAN style=3D"mso-spacerun: yes"> </SPAN>I calculate =
a 0.207=94=20
shim under the bottom pads and 0.069=94 shim under the top outside two =
pads.<SPAN style=3D"mso-spacerun: yes"> </SPAN>This would tip =
the engine=20
0.8 degrees up and put the crank in center of the =
hole.<o:p></o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: Arial">Good or bad idea?<o:p></o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: Arial">Darrell Kufalk<o:p></o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in =
0pt"><st1:place><st1:City><SPAN=20
style=3D"FONT-FAMILY: Arial">Waukesha</SPAN></st1:City><SPAN=20
style=3D"FONT-FAMILY: Arial">, </SPAN><st1:State><SPAN=20
style=3D"FONT-FAMILY: Arial">WI</SPAN></st1:State></st1:place><SPAN=20
style=3D"FONT-FAMILY: Arial"><o:p></o:p></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-FAMILY: =
Arial"><o:p> </o:p></SPAN></P></FONT></DIV></BLOCKQUOTE></BODY></HTM=
L>
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