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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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 Posted: Mon Aug 15, 2016 12:18 pm Post subject: Backfire fixes |
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Hey all,
On my RV-10 I've generally had not too bad an experience with
backfire. My engine will almost definitely backfire if I pull
the power all the way off during a descent. You can feel it under
your feet. Yes, the ground lean is set well. I've heard plenty
of planes do the same thing when fully reducing power, so it
didn't suprise me, and it's reproduce-able.
Now with my IO-390 on the RV-14 I experience the same thing.
I did the ground lean setup and if anything I have it even
leaner than the RV-10. But, it does tend to backfire a bit
earlier. I don't need a full power reduction to cause it.
If I just get the power very substantially pulled back, it'll
happen.
Is there anything else I could be missing that I should
be doing if I want to reduce that? I'm guessing if I
were to lean more aggressively that would help. But, I
haven't been leaning it as far lately simply due to the
engine being "new".
Just thought I'd troll for ideas on this one before I
just resign myself to living with it. I *think* I can
even see it on the EGT more on certain cylinders at
times. (i.e. #2 is the most common) It shows up as a
slightly raised EGT due to the fuel burning in the
pipe further down.
Tim
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Mon Aug 15, 2016 1:44 pm Post subject: Backfire fixes |
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I don't know for sure, but I would go full fine on the prop to keep rpm up, and avoid actually reaching the stop on throttle. I've seen it on the IO-360-A1A in my Mooney, but only with throttle fully closed.
-sent from the I-chip implanted in my forearm
On Mon, Aug 15, 2016 at 1:17 PM, Tim Olson <Tim(at)myrv10.com (Tim(at)myrv10.com)> wrote:
| Quote: |
Now with my IO-390 on the RV-14 I experience the same thing.
I did the ground lean setup and if anything I have it even
leaner than the RV-10. But, it does tend to backfire a bit
earlier. I don't need a full power reduction to cause it.
If I just get the power very substantially pulled back, it'll
happen.
Is there anything else I could be missing that I should
be doing if I want to reduce that? I'm guessing if I
were to lean more aggressively that would help. But, I
haven't been leaning it as far lately simply due to the
engine being "new".
Just thought I'd troll for ideas on this one before I
just resign myself to living with it. I *think* I can
even see it on the EGT more on certain cylinders at
times. (i.e. #2 is the most common) It shows up as a
slightly raised EGT due to the fuel burning in the
pipe further down.
Tim
|
| | - The Matronics RV10-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?RV10-List |
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD |
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