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1. 02:59 AM - engine power loss (IFLYSMODEL@AOL.COM)
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| Subject: | 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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