Webra 145 pump pressure ?

[Paul Horan]

Lance,
    The engine is running well at idle and WOT, mid range is only slightly rich and may be cooking the oil some.  I get a brownish 
exhaust oil with a slightly cooked smell.
    I am running PowerMaster mix of one gallon 15 % nitro with synthetic oil and one gallon of 5% nitro with castor/synthetic oil. 
I'm concerned about keeping the engine well lubed during break-in.  Vertical is almost unlimited with a 16.5 x 12 prop @ 7300 rpm. 
This prop/rpm is a very light load for this engine.  Exhaust oil at WOT is clear with no cooked smell, but since most of my flight 
is below 2/3 throttle the mid-range may be a bit lean (brownish exhaust oil)  or maybe I'm just too fussy.
What do you think ?
    Will you be at Waco, Bobby, BW, myself and possibly a couple of others from Temple will be there.
See you,
Paul
----- Original Message ----- 
From: "Lance Van Nostrand" <patterndude at comcast.net>
To: <discussion at nsrca.org>
Sent: Monday, April 04, 2005 10:56 PM
Subject: Re: Webra 145 pump pressure ?


> Paul,
> I've found the Webra loves nitro more than other 2 strokes. Why not up the nitro to at least 15 or probably 20.  Not sure what 
> fuel you are using that is 50-50 castor syn.  The omega 11-11 is a rarity.  If you've got it running that well on your weird soup 
> you are doing pretty well.
> --Lance
>
> ----- Original Message ----- 
> From: "Paul Horan" <phoran at vvm.com>
> To: <discussion at nsrca.org>
> Sent: Monday, April 04, 2005 1:56 AM
> Subject: Re: Webra 145 pump pressure ?
>
>
>> Steve,
>>    The 20 and 5% I am refering to is nitro.  I mixed 2 gallons one 5% nitro with castor/synthetic oil and one 15% nitro with all 
>> synthetic oil to get 10 % nitro with the oil being composed of 2/3 synthetic and 1/3 castor.  I want the castor to guard against 
>> wear during break-in.  I am new to tuned pipes, the pipe is long to keep the rpm down during break-in.
>>    If I understand you correctly, when I shorten the pipe it will richen the mid-range.  Is this correct ?   Currently I am 
>> delibrately rich at the top end and the mid-range is only slightly rich (pinch test).
>>    I am reluctant to mess with the pump and hoping that as I get more fuel through the engine the mid-range will richen up.  Is 
>> that reasonable ?
>>
>> Thanks,
>> Paul
>>
>> ----- Original Message ----- 
>> From: "RC Steve Sterling" <rcsteve at tcrcm.org>
>> To: <discussion at nsrca.org>
>> Sent: Sunday, April 03, 2005 5:13 PM
>> Subject: RE: Webra 145 pump pressure ?
>>
>>
>>> 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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