REFLECTOR:Problem mounting engine to firewall
Alex Balic
reflector@tvbf.org
Mon, 24 May 2004 08:59:37 -0500
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That is what I would do, I don't think that such a minor change will affect
anything performance-wise- might just make sure that the backing plate for
the spinner is parallel to the rear of the cowl though,
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On Behalf
Of Kufalk
Sent: Sunday, May 23, 2004 10:05 PM
To: reflector@tvbf.org
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.
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.
Good or bad idea?
Darrell Kufalk
Waukesha, WI
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<DIV><SPAN class=3D347595613-24052004><FONT face=3DArial color=3D#0000ff =
size=3D2>That=20
is what I would do, I don't think that such a minor change will affect =
anything=20
performance-wise- might just make sure that the backing plate for the =
spinner is=20
parallel to the rear of the cowl though,</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> =
reflector-admin@tvbf.org=20
[mailto:reflector-admin@tvbf.org]<B>On Behalf Of =
</B>Kufalk<BR><B>Sent:</B>=20
Sunday, May 23, 2004 10:05 PM<BR><B>To:</B>=20
reflector@tvbf.org<BR><B>Subject:</B> REFLECTOR:Problem mounting =
engine to=20
firewall<BR><BR></FONT></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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