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Max RPM adjustment

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rv10rob(at)gmail.com
Guest

Posted: Mon Jun 10, 2013 7:13 pm Post subject: Max RPM adjustment

I have the standard MT governor on my RV-10 (IO-540-D4A5). I had the max RPM set to 2700 RPM initially, but over time it has been declining slowly, to the point that it's about 2640 on climbout now, at 2+ years and 200+ hours. Is that to be expected (i.e. I should just adjust the stop screw) or is this indicative of a problem requiring further investigation? The governor appears normal and in all other respects operates normally. Thanks...

 



-Rob

-- 

Rob Kochman

RV-10 Flying since March 2011

 Woodinville, WA

 http://kochman.net/N819K

 

  [quote][b]

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Mon Jun 10, 2013 8:28 pm Post subject: Re: Max RPM adjustment

My MT was set at 2700 and still runs between 2690-2710 depending on temperatures. I would ensure you are hitting the high rpm stop when prop knob is fully forward and ensure the adjustment screw has not moved. I doubt it is normal wear and tear. Call MT. They may just tell you to readjust. Let us know what you find out.

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Wayne G.

dave.saylor.aircrafters(a
Guest

Posted: Mon Jun 10, 2013 9:20 pm Post subject: Max RPM adjustment

I'd back the screw out a bit and see if you get the RPM back. Â Make sure you have full travel to the screw. Â If you get to the screw but don't get the RPM back then I'd think your pitch stop inside the hub has changed but that seems very unlikely. Â Try the simple adjustment first and like Wayne said if you feel calling MT is helpful then by all means do that too.

  

Dave Saylor

831-750-0284 CL

 



On Mon, Jun 10, 2013 at 8:13 PM, Rob Kochman <rv10rob(at)gmail.com (rv10rob(at)gmail.com)> wrote:

[quote]  I have the standard MT governor on my RV-10 (IO-540-D4A5). I had the max RPM set to 2700 RPM initially, but over time it has been declining slowly, to the point that it's about 2640 on climbout now, at 2+ years and 200+ hours. Is that to be expected (i.e. I should just adjust the stop screw) or is this indicative of a problem requiring further investigation? The governor appears normal and in all other respects operates normally. Thanks...

   



-Rob

-- 

Rob Kochman

RV-10 Flying since March 2011

 Woodinville, WA

 http://kochman.net/N819K

 

   	  Quote: 	
		  



get="_blank">http://www.matronics.com/Navigator?RV10-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	
[b]

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Mon Jun 10, 2013 9:23 pm Post subject: Max RPM adjustment

Only make very small adjustment at a time. You do NOT want a prop 

overspeed. You want to achieve about 2650-2670 static rpm on the ground, 

which will get you darn close to 2700 on takeoff roll.



On 6/10/2013 10:19 PM, Dave Saylor wrote:

 	  Quote: 	
		   I'd back the screw out a bit and see if you get the RPM back.  Make 

 sure you have full travel to the screw.  If you get to the screw but 

 don't get the RPM back then I'd think your pitch stop inside the hub 

 has changed but that seems very unlikely.  Try the simple adjustment 

 first and like Wayne said if you feel calling MT is helpful then by 

 all means do that too.



 Dave Saylor

 831-750-0284 CL

 On Mon, Jun 10, 2013 at 8:13 PM, Rob Kochman <rv10rob(at)gmail.com 

 <mailto:rv10rob(at)gmail.com>> wrote:



     I have the standard MT governor on my RV-10 (IO-540-D4A5). I had

     the max RPM set to 2700 RPM initially, but over time it has been

     declining slowly, to the point that it's about 2640 on climbout

     now, at 2+ years and 200+ hours. Is that to be expected (i.e. I

     should just adjust the stop screw) or is this indicative of a

     problem requiring further investigation? The governor appears

     normal and in all other respects operates normally. Thanks...



     -Rob



     -- 

     Rob Kochman

     RV-10 Flying since March 2011

     Woodinville, WA

     http://kochman.net/N819K



     *



     get="_blank">http://www.matronics.com/Navigator?RV10-List

     tp://forums.matronics.com

     _blank">http://www.matronics.com/contribution



     *

 *

 *


	


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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

flysrv10(at)gmail.com
Guest

Posted: Tue Jun 11, 2013 12:03 am Post subject: Max RPM adjustment

Plugs good?  Timing good? Mags perfect? Air filter clean?  Plenum sealed?



I would start elsewhere for the cause of the RPM drop.

do not archive.



On Jun 10, 2013, at 11:13 PM, Rob Kochman <rv10rob(at)gmail.com (rv10rob(at)gmail.com)> wrote:

[quote]I have the standard MT governor on my RV-10 (IO-540-D4A5). I had the max RPM set to 2700 RPM initially, but over time it has been declining slowly, to the point that it's about 2640 on climbout now, at 2+ years and 200+ hours. Is that to be expected (i.e. I should just adjust the stop screw) or is this indicative of a problem requiring further investigation? The governor appears normal and in all other respects operates normally. Thanks...

 



-Rob

-- 

Rob Kochman

RV-10 Flying since March 2011

 Woodinville, WA

 http://kochman.net/N819K

 

   	  Quote: 	
		  



href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List

href="http://forums.matronics.com/">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/contribution



	
[b]

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Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Tue Jun 11, 2013 5:38 am Post subject: Max RPM adjustment

Excellent suggestions. Governor and prop settings rarely drift around. Lack of rpm usually means some loss of power, which usually implies either fuel or air are restricted or not fired at exactly the right time. Usual suspects are fouled plug(s), timing has drifted(normal with points wear), partially plugged injector, etc.

 



On Tue, Jun 11, 2013 at 1:03 AM, Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)> wrote:

 [quote]Plugs good?  Timing good? Mags perfect? Air filter clean?  Plenum sealed?



 I would start elsewhere for the cause of the RPM drop.

do not archive.

  	  Quote: 	
		  

_



	




[b]

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Tue Jun 11, 2013 6:39 am Post subject: Re: Max RPM adjustment

I think that applies to a fixed pitch prop or CS on the ground. Notice he said on climbout. As soon as you are rolling down the runway our prop pitch starts increasing. If he was developing 5% less power, his pitch would just start increasing later down the runway but should have still reached 2700. If he was developing less power than that then he should notice MP, FF, EGT and performance changes too. I usually get about 26.5 gph FF and 1250-1275 EGT's and on takeoff.



I keep pictures on my I pad/I phone of climb and cruise numbers from my 1st flights and occassionally after to reference back to. This will help me to troubleshoot if things slowly change. I also wrote all numbers down during most phase 1 flights.

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Wayne G.

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