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mhubel
Joined: 05 Sep 2009
Posts: 141
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 Posted: Tue Sep 08, 2009 5:41 am Post subject: Rotec carb at WOT |
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Lynn
I just ordered a Rotec for my Jabiru 3300. I hope I have done the right
thing. Concerning your experience with WOT producing slightly reduced
power, was the EGT going down when this happened meaning the mixture was
getting so rich that it was past acceptable levels? If this was true,
then leaning slightly to get the EGT back up to Jabiru's recommended
1250F (assuming your engine has the same recommendations) should have
helped.
--
Mark Hubelbank
NorthEast Monitoring
2 Clock Tower Place
Suite 555
Maynard, MA, 01754 - USA
mhubel(at)nemon.com
978-443-3955
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_________________
Mark Hubelbank
N708HU
CH601XL
Jabiru 3300
Rotec TBI 40-3 carb
Sensenich ground adj prop.
240 hr TAF
Pictures at photo.hubbles.com |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Tue Sep 08, 2009 6:25 am Post subject: Rotec carb at WOT |
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I really can't say that the power was reduced at WOT (although it
probably was), it's just that following Paul's recommendations, I
dialed the throttle back and saw the fuel flow increase and the rpm's
increase as well. It felt like the engine was puling the same power
but that's hard to tell. And concerning the EGT's, I can't say as I
noticed the EGT's during that same takeoff as when I'm watching the
tach and the fuel flow. When I take off, I use full rich mixture, as
it's kind of "puckerey" to be messing with the mixture during the
takeoff...for me anyway. Now when I land, that's where I DON'T go
full rich like most POH's say...I keep my hand near the mixture, on
the throttle, ready for a possible go-around, but the engine runs a
lot better during landings at full lean. Heck, I pull full lean at
about the start of the turn to base and leave it there. If I have to
go around, I hit full rich, and ease the throttle in full. I've tried
to go to full throttle from a lean setting while at altitude, and the
engine bogs to almost quitting. To save it, I hit full rich, pull
back to closed throttle, and ease the throttle in, taking about 1-2
seconds to go from closed throttle to WOT.
With your 3300, you may not have to resort to a slightly less than
WOT to get best rev count. Because the Rotec TBI was designed for a
2800 or 3600 cc engine, it is larger than
my 2200 "should" take. But it might work just fine on yours without
the restricted throttle operation. When I first tried the "short
throttle" I was going to stack a few slotted washers on the throttle
control, but found it easier to just push it WOT, then dial (vernier)
it back until I felt a 1/4" or so gap. Because of my throttle control
moving almost 3", and the slide on the TBI moving about 1-3/4" (?),
I'd guess that I'm only restricting about 1/16" to 1/8" of full slide
opening.
Next time I go up (raining like a bear p------ on a flat rock, today)
I'll see what WOT versus 1/4" less-than-WOT produces in terms of rpm,
fuel flow, EGT, CHT, etc., at altitude, and I'll also see what the
EGT's are like. I already know what the rpm's and fuel flow are doing
during takeoff, so I can pretty much forget watching them and
concentrate on the EGT's wile I dial the throttle back...good
thought, Mark.
In talking with a guy with a Europa, he ordered one but there wasn't
room to install it...hope you've got the room, Mark. It really is
less room-consuming front-to-back, but a bit more room is required in
the throttle slide direction.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 760.3 hrs
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
On Sep 8, 2009, at 9:30 AM, Mark Hubelbank wrote:
| Quote: |
<mhubel(at)nemon.com>
Lynn
I just ordered a Rotec for my Jabiru 3300. I hope I have done the
right thing. Concerning your experience with WOT producing slightly
reduced power, was the EGT going down when this happened meaning
the mixture was getting so rich that it was past acceptable levels?
If this was true, then leaning slightly to get the EGT back up to
Jabiru's recommended 1250F (assuming your engine has the same
recommendations) should have helped.
--
Mark Hubelbank
NorthEast Monitoring
2 Clock Tower Place
Suite 555
Maynard, MA, 01754 - USA
mhubel(at)nemon.com
978-443-3955
|
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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