[SPAM] Re: [SPAM] Re: A Bearing Tip - Boca Bearing Newsletter

[BUDDYonRC at aol.com]

In a message dated 5/20/2005 8:55:35 AM Central Daylight Time,  
DaveL322 at comcast.net writes:

Yes.
 
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).

Dave
 

--------------  Original message -------------- 
Dave, did you do something to reduce the  compression/timing such as adding a 
shim to the Webra 160?

----- Original Message ----- 
From:  _David Lockhart_ (mailto:DaveL322 at comcast.net)  
To: _discussion at nsrca.org_ (mailto:discussion at nsrca.org)  
Sent: Thursday, May 19, 2005 11:04  PM
Subject: Re: [SPAM] Re: A Bearing Tip  - Boca Bearing Newsletter


With specific reference to the OS140, I gotta  agree - use the sealed SS BB 
with both seals.  I've seen 500+  flights.
 
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.

Dave






----- Original Message ----- 
From:  _Verne  Koester_ (mailto:verne at twmi.rr.com)  
To: _discussion at nsrca.org_ (mailto:discussion at nsrca.org)  
Sent: Thursday, May 19, 2005 11:18  PM
Subject: Re: [SPAM] Re: A Bearing  Tip - Boca Bearing Newsletter


Rodney, 
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!
 
Verne Koester

----- Original Message ----- 
From:  _Rodney Tanner_ (mailto:rodney19821982 at yahoo.com)  
To: _discussion at nsrca.org_ (mailto:discussion at nsrca.org)  
Sent: Thursday, May 19, 2005  10:33 PM
Subject: [SPAM] Re: A Bearing Tip  - Boca Bearing Newsletter


Bob, So using an OS 140 EFI bearing, is it advisable to remove  the seals?
Rodney

Bob Pastorello <_rcaerobob at cox.net_ (mailto:rcaerobob at cox.net) >  wrote:

Since I use theirs, I get this  e-newsletter.  This month's tip;
<<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 _Help  Section_ 
(http://www.bocabearings.com/main1.aspx?p=help#six) .
 
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.
In our next issue of the Boca  Bearings Tips & Advice Newsletter we will show 
you how to  remove your bearing shields. >> 
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.



Bob Pastorello
_www.rcaerobats.net_ (http://www.rcaerobats.net/) 
_rcaerobob at cox.net_ (mailto:rcaerobob at cox.net) 

Yes and it also alters the ignition timeing. This is common prectice and  has 
been done for a number of years with the YS four strokes. And believe me it  
works.
Buddy 
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