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<DIV>Yes.</DIV>
<DIV> </DIV>
<DIV>Headshims to reduce compression. Obviously, this reduces the power. Not as obviously it tends to reduce the amount of unload and it made the engine more sensitive to having a fresh hot plug (engine ran cooler and the plug would go out more easily if set too rich).</DIV>
<DIV><BR>Dave</DIV>
<DIV> </DIV>
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<DIV><FONT face=Arial size=2>Dave, did you do something to reduce the compression/timing such as adding a shim to the Webra 160?</FONT></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=DaveL322@comcast.net href="mailto:DaveL322@comcast.net">David Lockhart</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, May 19, 2005 11:04 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [SPAM] Re: A Bearing Tip - Boca Bearing Newsletter</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>With specific reference to the OS140, I gotta agree - use the sealed SS BB with both seals. I've seen 500+ flights.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I'm also concluding that much of the damage to rear bearings is from running the engines overcompressed resulting in pre-ignition (detonation, pinging, etc). I just changed the stock bearing in a Webra160 after about 400 flights - all with the compression substantially reduced. Several years ago, a Bully (Webra) 145 I ran needed new bearings every 100-150 flights, and was relatively much more compressed.</FONT></DIV><FONT face=Arial size=2>
<DIV><BR>Dave</DIV>
<DIV></FONT> </DIV>
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<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=verne@twmi.rr.com href="mailto:verne@twmi.rr.com">Verne Koester</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, May 19, 2005 11:18 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [SPAM] Re: A Bearing Tip - Boca Bearing Newsletter</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial>Rodney, </FONT></DIV>
<DIV><FONT face=Arial>If you're putting it in an O.S. 1.4, definitely leave the seals in. You'll get 300-500 flights with the seals in. With them out, you'll be lucky to put 5 gallons through the engine before they're shot!</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Verne Koester</FONT></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=rodney19821982@yahoo.com href="mailto:rodney19821982@yahoo.com">Rodney Tanner</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, May 19, 2005 10:33 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [SPAM] Re: A Bearing Tip - Boca Bearing Newsletter</DIV>
<DIV><BR></DIV>
<DIV>Bob, So using an OS 140 EFI bearing, is it advisable to remove the seals?</DIV>
<DIV>Rodney<BR><BR><B><I>Bob Pastorello <<A href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A>></I></B> wrote:</DIV>
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<DIV><FONT face=Arial size=2>Since I use theirs, I get this e-newsletter. This month's tip;</FONT></DIV>
<DIV><FONT face=Arial size=2><<If your Front engine bearing has two rubber seals you should not remove them. These bearings have their own grease and can help stop oil leaks. If your bearing has two shields, we recommend you remove one of them. For instructions on removing your shields take a look at this <A class=fpbodylink href="http://www.bocabearings.com/main1.aspx?p=help#six">Help Section</A>.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Your Rear engine bearing should be open on both sides to allow as much fuel as possible to pass through and act as a lubricant. You may however want leave one shield on in the rear which would help to protect the rest of the engine from any foreign matter getting through. This should not be done with one seal. If you find your engine is stingy in getting fuel to the rear, you should definitely leave the bearing open.</DIV>
<P class=body2><SPAN class=body2>In our next issue of the Boca Bearings Tips & Advice </SPAN>Newsletter we will show you how to remove your bearing shields. >></P>
<P class=body2>Note - if you open your crankcase, using sealed bearings, and the crankshaft counterweight it dry-looking, or the lower part of the bearing isn't pooling oil, you may think about removing the seals. I do, for this reason.</P></FONT>
<DIV><FONT face=Arial size=2><BR>Bob Pastorello<BR><A href="http://www.rcaerobats.net/">www.rcaerobats.net</A><BR><A href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A></FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></body></html>