|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

10-08-2011, 03:41 PM
|
|
|
|
Join Date: Jan 2005
Location: Henderson, NV
Posts: 16
|
|
Mag. Drop
I ran my engine above idle for the first time today. While checking the mag's at 4000 RPM with the "A" ignition switch off, had a 100 rpm drop, with the "B" switch off had a 500 rpm drop and the engine was quite rough. I am not familiar with the Rotax engine and need some help/ideas. Just walked away from it this morning, will go out Monday and pull the cowling and see if there is anything obvious.
Dick
__________________
Dick McEwen
RV-6A
Henderson, NV.
|

10-08-2011, 03:49 PM
|
 |
|
|
Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
|
|
Sounds like you are making good progress.
The engine snafu is minor and you should be able to correct.
1. Check the spark plug wires and make sure you have them on the correct cylinders, top and bottom plugs. The wires are marked. #1 Cylinder is right front (passenger side) (After all of the work we did on the engine it is fairly easy to get the wires crossed). If they are good go to step #2.
2. Check the connectors to the modules and make sure they are snapped togeather tight.
3. If those things don't do it you may need to recheck the gap on the pickup we moved when we attached the motor mount.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
Last edited by Geico266 : 10-08-2011 at 04:06 PM.
|

10-08-2011, 04:49 PM
|
|
|
|
Join Date: Jun 2009
Location: hazelwood north vic
Posts: 176
|
|
rpm drop
.
also check the plug gaps but sounds like plug leads are crossed over
|

10-08-2011, 05:50 PM
|
|
|
|
Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
|
|
Do what Larry says. I'm betting it is either crossed wires, or possibly just one wire not seated on the plug.
__________________
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
|

10-13-2011, 10:12 PM
|
|
|
|
Join Date: Jan 2005
Location: Henderson, NV
Posts: 16
|
|
Mag. Drop
Larry Gerger e-mailed me and said I should report what I fornd. Went to the hangar and pulled the top cowl, checked plug leads and then pulled the top plugs. Plug in #2 cyl. was shorted. I don't know how it happened. All was well after I regaped the plugs.
Dick
__________________
Dick McEwen
RV-6A
Henderson, NV.
|

10-14-2011, 07:43 AM
|
 |
|
|
Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
|
|
Shorted? Meaning the electrodes were touching or just fouled?
|

10-14-2011, 09:28 AM
|
 |
|
|
Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
|
|
Quote:
Originally Posted by DonFromTX
Shorted? Meaning the electrodes were touching or just fouled?
|
From what I gathered the electrodes were touching. May be dropped the plug?
Anyway, that is great news that is was something simple. These engines are "almost" bullet proof, so having a mag drop and the engine running rough is unusual, and usually something simple.
************
As a suggestion in the future, I was told to replace any plug that is dropped. The ceramic cone could be cracked and cause major damage to that cylinder if it come loose.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
Last edited by Geico266 : 10-14-2011 at 09:32 AM.
|

10-14-2011, 01:26 PM
|
|
|
|
Join Date: Jan 2005
Location: Henderson, NV
Posts: 16
|
|
Mag Drop
The electrodes were touching. Don't know how it happened or how I missed it.
Dick
__________________
Dick McEwen
RV-6A
Henderson, NV.
|

10-14-2011, 04:00 PM
|
 |
|
|
Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
|
|
Thanks for sharing that, might well help someone else out.
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 02:49 AM.
|