Webra bearing life report

[Rcmaster199 at aol.com]

Hi Dave, this was written about fairly recently. Mobil 1 is a superb oil in 
its ability to not just coat and "wet out" a metal surface, but to actually 
penetrate the surface and bond to it. That's the main reason full size engines 
last and last when they are fed this stuff regularly.

But that same property, metal penetration, is likely causing the elements of 
the plugs to get fouled prematurely. A glass hard coating  will build onto the 
element, killing its catalytic properties. There's nothing wrong with the 
procedure you outlined. I would continue except I would change after run oils. My 
favorite is castor but I know Dean likes Amsoil, and others use Klotz and 
other oils contained in fuel. 

MattK
I've been running the 1.45 for a couple of months and have about 10 hours (58 
flights) on it so far. The bearing is showing no signs of wear yet. I'm 
running 15% S&W fuel and run the engine dry after every session and LOAD it with 
Mobil 1; not just a few drops - probably about a tablespoonful, maybe more. I 
removed the integral pump and am using a Perry so probably any after run oil 
would do; no diaphragm to worry about.

For the first run of the day, I remove the glow plug and blow out the oil 
with the starter, replace the plug and start it up. It usually "complains" a 
little for the first start, but it always runs on the second or third try. 
Thereafter it will flip start for the rest of the day.

It does eat plugs, though. They seem to last only about 10-12 flights. (OS 
F's) Any cure for this?

Dave Wartel
----- Original Message ----- 
From: Rcmaster199 at aol.com 
To: discussion at nsrca.org 
Sent: Sunday, September 26, 2004 9:59 PM
Subject: Re: Webra bearing life report


That is terrible bearing life from the set-up Keith. Mine lasted about 100 
hours (452 flights) until the pump finally went, which meant the engine ran lean 
for several flights and then the bearing went.

Bearing no 2 has run all season and has about 32 hours on it so far, or about 
150 flights; same engine with a new pump.

Fuel is the same cool power I spoke about before: 50:50 mix of 5% CP and 30% 
heli mix, plus one ounce of Klotz Pro per gallon

MattK
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