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                           Lightning-List Digest Archive
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                     Total Messages Posted Sat 07/09/11: 1
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Today's Message Index:
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     1. 02:59 AM - engine power loss  (IFLYSMODEL@AOL.COM)
 
 
 
________________________________  Message 1  _____________________________________


Time: 02:59:56 AM PST US
From: IFLYSMODEL@AOL.COM
Subject: Lightning-List: engine power loss

Hey Nick: I found Pete's info about the recommended Jabiru  
power/rpm/settings. It seems straight forward when you have an engine operating
correctly. 
Since mine still does not, what do we do?

Pete's info >>> This is really quite simple.  We've built  over 200 planes 
here at Jabiru USA
> with Jabiru engines.  Each  airframe / engine combination needs to have 
the
> carb tuned to the  airframe drag and prop load that will be placed on the
> engine.   First - climb out at full throttle at normal climb attitude and
> observe  the EGT during climb.  The center of the spread should be 1225 F.
>  If lower then change to a smaller main jet.  If higher change to a  
larger
> main jet.
> 
> Then level off for cruise at normal  cruise rpm - 2850 for the 3300 and 
2900
> - 2950 for the 2200.   Observe EGT's.  Center of the range should be 1325.
> If lower  install smaller needle jet.  If higher install larger needle 
jet.
>  
> This procedure works for us every time but there are a few  requirements.
> The prop that is installed must allow normal static rpm  range of 2700 -
> 2800.  We don't do a true static but take the  runway and apply full 
throttle
> and observe rpm before plane leaves the  ground.  We will not continue if 
rpm
> is not at 2700 or  more.
> 
> Finally - we compare right and left sides of engine for  EGT.  If one 
side is
> hotter than the other we tilt the carb a few  degrees with bottom toward 
the
> hot side of the engine.  Most every  time this will even out temps after a
> few flights of trial and  error.
> 
> We've used this procedure on Jabiru Calypso's, J170's,  SP's, J250's and
> J230's as well as Rans S7 and S-19, Zenith CH601,  CH701, Avids, Kitfox 4 
&
> 7, Titan Tornado's, Kolb Mark III, and next  week a Vans RV-12.
> 
> One necessary item for successful  installation and adjustment is an 
engine
> monitor that monitors all  cylinders accurately.  We think a GRT EIS is 
the
> best instrument  for accuracy and reliability but a few others are now
> getting  better.  Most of our customers' engine problems come from
>  installations without sufficient monitoring.  For instance - we have a  
2200
> in here now that broke a valve.  There was no EGT instrument  in the
> airplane.  The prop used was such a low pitch that it never  loaded the
> engine enough to make the carb deliver the right mixture but  the operator
> didn't have a clue of what was happening.
> 
>  I don't obsess over charts or graphs - I just get the engines tuned to  
the
> temp range specified in Jabiru's literature and for the most part  have 
few
> issues.
> 
> 
> Pete Krotje
> Jabiru  USA Sport Aircraft, LLC
> 931-680-2800
> www.usjabiru.com
>  
<<

    Still waiting answers
Lynn

 

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