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04-29-2010, 12:15 AM
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Join Date: Mar 2008
Location: Hardin, KY
Posts: 135
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RPM problem
OK, doing some of the final checks prior to first flight.
Running up the engine for mag check and full power, (See below for engine type), and the RPM gauge (Dynon) got to about 1300 + rpm's but the engine was ,very obviously, running near full rpm's. Throttle was almost all the way in. This tells me I have a problem with the rpm showing about 50% on the gauge.
I did not troubleshoot this tonight yet, but, I seem to remember something while wireing the engine that might cause this.
Can anyone lead me in the right direction?
By the way, the engine did sound real good!
__________________
Carl Nank
Western KY Lakes Region
N39CN
RV7-A, Superior IO-360, 180HP, Hartzell, Dynon D100, D10 & HS34. Garmin 430W & 327 xp. PS Engineering 8000B audio w/3 light marker beacon. Approach Avionics Pro Hub.
Cut Instrument panel myself. I installed avionics myself. Panel is powdercoated a beautiful dark blue crackle.
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04-29-2010, 12:24 AM
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Join Date: Jan 2005
Location: Winslow, UK
Posts: 18
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You need to change the PULS/REV R & L settings in the Tachometer Sensor setup page. IIRC a Lycoming with mags should be set to 2.
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04-29-2010, 12:29 AM
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Join Date: Oct 2008
Location: Arlington, WA
Posts: 799
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RPM
per the Dynon installation guide...
In the EMS Setup Menu, select the Tach sensor. You need to adjust your "Puls/Rev". If the EMS is indicating 1300rpm and you think the engine is running at 2600 (full throttle), then you should adjust the Puls/Rev to 1/2 of it's current value (ie if it's set at 4.0, you should set it at 2.0).
Good luck!
__________________
_______________________________
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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04-29-2010, 08:25 PM
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Join Date: Mar 2008
Location: Hardin, KY
Posts: 135
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issues prior ro first flight
Thanks Scott,
I had the Tach/pulse set at "2" when I originally did my Dynon Calculation. I changed it to "1" and that took care of my problem of the Dynon indicating my tach RPM at about 1/2 of actual RPM.
Now I have another issue in that as I pushed my throttle in nearly all the way to determine if the engine would come up to full power, it overspeeded to 2800 RPM. Top RPM is supposed to be 2700 RPM.
I apparantly need to adjust my overspeed adjusment on the front of my propeller, (constant speed). Seems as I correct one issue in my quest to get to first flight, another problem pops up.
Again, Thanks
__________________
Carl Nank
Western KY Lakes Region
N39CN
RV7-A, Superior IO-360, 180HP, Hartzell, Dynon D100, D10 & HS34. Garmin 430W & 327 xp. PS Engineering 8000B audio w/3 light marker beacon. Approach Avionics Pro Hub.
Cut Instrument panel myself. I installed avionics myself. Panel is powdercoated a beautiful dark blue crackle.
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04-30-2010, 05:44 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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I can confirm that with a O-360 and slick mags, it must be set to "1" ppr not "2"....
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04-30-2010, 05:46 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Yep, These sometimes need to be tweaked.....
Hang in there, your on the home stretch.. It won't be long now and it is very worth it!!!
Quote:
Originally Posted by carl nank
Now I have another issue in that as I pushed my throttle in nearly all the way to determine if the engine would come up to full power, it overspeeded to 2800 RPM. Top RPM is supposed to be 2700 RPM.
I apparantly need to adjust my overspeed adjusment on the front of my propeller, (constant speed). Seems as I correct one issue in my quest to get to first flight, another problem pops up.
Again, Thanks
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04-30-2010, 05:51 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Good luck with the first flight.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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04-30-2010, 07:21 AM
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Join Date: Feb 2006
Location: Fort Worth, Tx
Posts: 180
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Prop adjustment
I apparantly need to adjust my overspeed adjusment on the front of my propeller, (constant speed).
Carl,
Start your RPM adjustments on the Prop Governor first, not the prop.
Rich
__________________
Rich Rudolph
VAF#007
RV6A 2000 HRS.
Fort Worth,Tx.
Wright Brothers “Master Pilot” Award
Last edited by rich : 04-30-2010 at 09:07 AM.
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04-30-2010, 07:58 AM
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Join Date: Jan 2005
Location: Atlanta, GA
Posts: 2,295
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Quote:
Originally Posted by Brantel
I can confirm that with a O-360 and slick mags, it must be set to "1" ppr not "2"....
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This is completely according to how you are picking up RPM information. If you are using a accessory case mounted sensor (like I am) then the setting is different.
__________________
"What kind of man would live where there is no daring? I don't believe in taking foolish chances but nothing can be accomplished without taking any chance at all." - Charles A. Lindbergh
Jamie | RV-7A First Flight: 7/27/2007 (Sold)
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04-30-2010, 11:33 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Yep sorry I forgot to qualify my setting....
My statement is only for when you use the tap the p-lead method....
Thanks Jamie!
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