REFLECTOR:Problem mounting engine to firewall
Christopher Martin
reflector@tvbf.org
Sun, 23 May 2004 22:53:37 -0700
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I had the same problem when I mounted my engine in 2000. I installed 2 washers on the bottom 2 holes and 1 on each of the middle holes. The result was perfect and now, after 460 hours and 4 years there is the need to raise them by adding 1 more washer. This is the standard fix and there has never been any problem with it for me.
Chris Martin
Velocity XL RG
El Monte, CA
----- Original Message -----
From: Kufalk
To: reflector@tvbf.org
Sent: 5/23/2004 9:43:09 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.
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>I had the same problem when I mounted my engine in 2000. I installed 2 washers on the bottom 2 holes and 1 on each of the middle holes. The result was perfect and now, after 460 hours and 4 years there is the need to raise them by adding 1 more washer. This is the standard fix and there has never been any problem with it for me.</DIV>
<DIV> </DIV>
<DIV>Chris Martin</DIV>
<DIV>Velocity XL RG</DIV>
<DIV>El Monte, CA</DIV>
<DIV> </DIV>
<DIV></DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=kufalk@wi.rr.com href="mailto:kufalk@wi.rr.com">Kufalk</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To: </B><A title=reflector@tvbf.org href="mailto:reflector@tvbf.org">reflector@tvbf.org</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> 5/23/2004 9:43:09 PM </DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> REFLECTOR:Problem mounting engine to firewall</DIV>
<DIV><BR></DIV><FONT size=2>
<DIV><FONT face=Arial size=2>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial">I just drilled the 5 holes in my XLRG’s firewall to mount a Lycoming IO-540.<SPAN style="mso-spacerun: yes"> </SPAN>I paid particular attention to getting the height correct.<SPAN style="mso-spacerun: yes"> </SPAN>I didn’t want the engine sagging below center like most of the Velocitys I have seen.<SPAN style="mso-spacerun: yes"> </SPAN>The plans say to hang the engine 1/4” to 3/8” above center to account for the flex in the rubber mounts.<SPAN style="mso-spacerun: yes"> </SPAN>I wanted mine a little higher than that to make up for additional sagging over time.<SPAN style="mso-spacerun: yes"> </SPAN>I hung mine 7/16” above center.<SPAN style="mso-spacerun: yes"> </SPAN>I drilled the holes, installed the bolts, took the hoist off and reinstalled the cowling to check the height.<SPAN style="mso-spacerun: yes"> </SPAN>I was very surprised to find the center if the crank 1/4” BELOW center!<SPAN style="mso-spacerun: yes"> </SPAN>I am not sure why this happened.<SPAN style="mso-spacerun: yes"> </SPAN>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.<SPAN style="mso-spacerun: yes"> </SPAN>The stainless may have been bowed out slightly on the bottom.<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial">So does anyone have any idea how to fix this?<SPAN style="mso-spacerun: yes"> </SPAN>I was thinking about putting shims under the bottom pads to tip the engine up enough to make up the difference.<SPAN style="mso-spacerun: yes"> </SPAN>I calculate a 0.207” shim under the bottom pads and 0.069” shim under the top outside two pads.<SPAN style="mso-spacerun: yes"> </SPAN>This would tip the engine 0.8 degrees up and put the crank in center of the hole.<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial">Good or bad idea?<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial">Darrell Kufalk<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><st1:place><st1:City><SPAN style="FONT-FAMILY: Arial">Waukesha</SPAN></st1:City><SPAN style="FONT-FAMILY: Arial">, </SPAN><st1:State><SPAN style="FONT-FAMILY: Arial">WI</SPAN></st1:State></st1:place><SPAN style="FONT-FAMILY: Arial"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P></FONT></DIV></FONT></BLOCKQUOTE></BODY></HTML>
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