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12-26-2012, 09:46 AM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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I had a wire to #3 from the Lightspeed plasma II come off on takeoff and the engine acted the same way... might check and make sure all wires from the L/S are on and firmly snapped down tight to the spark plug.
Stuck valve would be my next direction.
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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12-26-2012, 09:53 AM
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Join Date: Oct 2008
Location: Arlington, WA
Posts: 799
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Quote:
Originally Posted by frazitl
a sticking exhaust valve on #2. I would do a wobble test and make sure my push rods on #2were still straight...
Great job getting her down. How did your passenger react?
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I pulled the rocker cover and did a wobble test - everything moved, springs were springing properly...
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A little rough and high EGT may also indicate you are losing ignition to one plug. First thing I would do is check wires, connections etc. and replace plugs on offending cylinder.
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Engine was running very rough, and I'm pretty sure it wasn't just one of the two plugs not firing. I did check connections, everything was secure. I pulled both top and bottom plugs and checked gap and cleanliness...
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Perhaps its the way you wrote the issue, but I got far more concerned about the reaction than I did the problem while reading. Even a completely out cylinder, while feels terrible, is no cause for 'I have to get down now'. Let it stumble, climb and access.
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Ummm... My passenger was up for only her second flight. Do you really think that I should have continued the flight with a newbie in the plane when I have a perfectly good airport right under my wing?
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Scott "Grumpy" Stewart
RV-7 N957RV (First Flight on Dec 18, 2009 )
RV-14 N144P (Empennage complete, wings almost complete, fuselage almost complete)
#866 on the Van's RV-7 hobbs
#6563 on Van's generic hobbs
Arlington, WA
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12-26-2012, 10:04 AM
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Join Date: Feb 2006
Location: East Texas
Posts: 192
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Great job
Scott
Great job getting the aircraft on the ground with no problems. Being that low on takeoff with an engine problem, I think you made a wise choice. Get it safely on the the ground then do some troubleshooting.
Glad your ok.
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Marc Hudson
Houston
RV-7 Sold
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12-26-2012, 10:15 AM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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Quote:
Originally Posted by marchudson
Scott
Great job getting the aircraft on the ground with no problems. Being that low on takeoff with an engine problem, I think you made a wise choice. Get it safely on the the ground then do some troubleshooting.
Glad your ok.
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Agreed completely, great job and decision to return safely and not take additional risks.
Taking risks and playing with our own lives should be our choice, but playing with our passengers lives should not be our choice.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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12-26-2012, 10:19 AM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Good to here you are ok Grumpy
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Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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12-26-2012, 11:28 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Ummm... My passenger was up for only her second flight. Do you really think that I should have continued the flight with a newbie in the plane when I have a perfectly good airport right under my wing?
I agree - better to be safe than sorry, especially with a passenger out for a second flight. No sense scaring her more than already done.
Greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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12-26-2012, 11:34 AM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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Quote:
Originally Posted by DakotaHawk
. . . Ummm... My passenger was up for only her second flight. Do you really think that I should have continued the flight with a newbie in the plane when I have a perfectly good airport right under my wing?
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Was it the Stylist? That was a grat video, BTW.
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Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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12-26-2012, 11:53 AM
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Join Date: Oct 2008
Location: Arlington, WA
Posts: 799
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Quote:
Originally Posted by AltonD
Was it the Stylist? That was a grat video, BTW.
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Not the stylist this time. This is a young lady who does some part-time work for one of the local FBOs. (ps. She's not the one in the red suit!)

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_______________________________
Scott "Grumpy" Stewart
RV-7 N957RV (First Flight on Dec 18, 2009 )
RV-14 N144P (Empennage complete, wings almost complete, fuselage almost complete)
#866 on the Van's RV-7 hobbs
#6563 on Van's generic hobbs
Arlington, WA
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12-26-2012, 12:17 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
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Quote:
Originally Posted by Kahuna
A cylinder miss & rising egt should be no cause for alarm or need for a cool head. Pulling power, pushing the nose over and dropping flaps and heading back to the runway really kept you from determining what the problem was. There was more sleuthing to do.
There are a number of items that could be the cause as others have mentioned.
Perhaps its the way you wrote the issue, but I got far more concerned about the reaction than I did the problem while reading. Even a completely out cylinder, while feels terrible, is no cause for 'I have to get down now'. Let it stumble, climb and access.
A nice pattern while troubleshooting would help pinpoint the problem. You could simply have a fouled plug, bad plug, intake leak, ign wire, plugged injector, or a number of other items. Some of these are difficult to troubleshoot on the ground.
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No thanks. I also prefer to do my trouble shooting on the ground.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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12-26-2012, 01:23 PM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Quote:
Originally Posted by DakotaHawk
What's an injector check?
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Follow the stainless line from the fuel spider on the top of the engine to the offending cylinder on top. Loosen the nut (I think it's a 3/16") and carefully pull out the small injector from the flared end. Check to see if some contamination might've partially blocked it...maybe stick some small safety wire in it. Reinstall.
I had the problem you describe and started pulling everything off the engine and the last thing we checked -- the small injector on the top of the cylinder (I have Lightspeed on the top) had a VERY small piece of junk (it looked like a piece of SuperFil about the size of a pencil head) blocking it.... so fuel wasn't getting into the top...which accounted for the high EGT on my cylinder.
The engine has run great since then.
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