Webra 145 pump pressure ?

[RC Steve Sterling]

If I am reading your message correct, you are running 25% total oil (20%
synthenic and 5% castor)??

If so, that is probably too much oil for the Webra. I once tried 20% total
oil, and it didn't like it much. I backed down to 17-18% total oil and it
ran much better. I happen to run all synthetic now, but have tried some with
a little castor (total oil 18%) and it ran fine on that also.

7300 RPM is pretty low on a 16.5 x 12 prop for this engine. I think most get
more like 7900 RPM. You may need to adjust pipe length a little. If it is
anything like my Greve pipe, it really makes a big difference on the
midrange mixture as well. My troubles were with too rich midrange. I'd try
different fuel, then try a 1/2 inch pipelength change first before trying
pump pressure.

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Paul Horan
Sent: Sunday, April 03, 2005 10:09 AM
To: discussion at nsrca.org
Subject: Webra 145 pump pressure ?


    My Webra has a good top and bottom end. Only about a gallon and a half
through it so far.
The top end is nice and smokey, idle is solid, but the mid range is very
little smoke.
It is on a Prophecy running a 16.5 x 12 at 7300 rpm with the Macs pipe at 27
inches.
Most of my flight is at roughly 1/2 throttle.  When I land the oil residue
on the coupler and
fuselage is medium brown - fuel is a mix of 20 % synthetic and 5 % castor
synthetic.
Main needle is open 1.5 turns.
    I am wondering if I should increase the pump pressure to richen up the
midrange.
Or am I just being too fussy ?
Thanks,
Paul Horan
KC5NF
AMA 57131
NSRCA 3606
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