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psm(at)ATT.NET
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 Posted: Mon Jun 16, 2008 10:04 am Post subject: cht & egt |
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Hi Bobby,
I was thinking about the input side of the carburetor too.
I wonder if you added some sort of vanes to the input tube that might
make the air flow better through the carb. I have no clue whether
this would help, but I remember reading some notes in the Jabiru
installation manual focusing on the last inch or two of ducting going
to the carburetor.
Good luck,
Paul
XL nearly done
At 10:46 AM 6/16/2008, you wrote:
| Quote: | all,
my Egt on no.5 cylinder (Jab 3300) also runs hotter which bumps the
CHT up to 330 plus. i can lean the carb 5 to 10 degrees toward #5
but then #6 starts heating up roughly the same as 5 cooling down. i
think it may have a lot to do with the close proximity of the 5 & 6
cylinders coming off the manifold at right angles to the flow of
fuel / air mixture as well as the inlet to the carby not having
straightening vanes in it.. the fuel / air mixture being dense will
tend to flow past #5 & #6 and feed the other four.
i have removed the top butterfly baffles and installed larger
Continental type on the bottom which helped a lot. that got all
CHT's in the 270 - 290 range except 5 & 6. the new baffles also
lower my oil temp from 215 down to 185 - 190. does any one have a
good idea on how to get the back 2 cyl. cooler. i am using the early
Pacific Zenith cowl and suspect it may not have sufficient inlet
area as well. that would make the back cylinders starve for air.
i would like to solve the problem without buying the newer cowling
from Pete at Jabiru USA if i can. i am in Florida and the temps are
over 90 most of the time. i have to pull throttle back to 25" at 400
- 500' to keep from over temping CHT on #5 during climb out.
N131BP
65 Hrs.
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amyvega2005(at)earthlink.
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| Posted: Tue Jun 17, 2008 3:18 am Post subject: cht & egt |
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my cht temps are not over 290. you need to add vains on the inside of the duct pushing air down to the cylinder.
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