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RPM Issue

 
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mhealydds



Joined: 17 May 2015
Posts: 21
Location: Wichita, KS

PostPosted: Sun Jul 16, 2017 3:43 pm    Post subject: RPM Issue Reply with quote

Newish RV-10 (70 hours). So far I have had no problems since ending build with flight but during run up on today's flight rpm was normal at idle but with power quickly shot up to over 2000 (at lower than normal throttle setting) and rapidly dropped off during single mag use. Prop cycle gave no real change in pitch (no audible change). Tried high speed down taxiway and rpm went into red again. Took off cowl and linkage to govenor was fine and no other obvious problems other than engine maybe hot (or it just seemed that way as 95 outside). I have hartzell govenor from vans. Does that mean bad governor you think?

Thanks
Matt


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Tim Olson



Joined: 25 Jan 2007
Posts: 2651

PostPosted: Sun Jul 16, 2017 4:19 pm    Post subject: RPM Issue Reply with quote

Right now all you said is that the RPM went up to 2000. Without having actual RPM numbers, I'm not sure what to say. You said the RPM went into the red, but are you saying that there is a red on the low-end or the high-end? It's not clear if you mean that it actually went over 2700 RPM.
Tim

Quote:
On Jul 16, 2017, at 6:43 PM, mhealydds <mhealydds(at)gmail.com> wrote:



Newish RV-10 (70 hours). So far I have had no problems since ending build with flight but during run up on today's flight rpm was normal at idle but with power quickly shot up to over 2000 (at lower than normal throttle setting) and rapidly dropped off during single mag use. Prop cycle gave no real change in pitch (no audible change). Tried high speed down taxiway and rpm went into red again. Took off cowl and linkage to govenor was fine and no other obvious problems other than engine maybe hot (or it just seemed that way as 95 outside). I have hartzell govenor from vans. Does that mean bad governor you think?

Thanks
Matt




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mhealydds



Joined: 17 May 2015
Posts: 21
Location: Wichita, KS

PostPosted: Sun Jul 16, 2017 4:31 pm    Post subject: Re: RPM Issue Reply with quote

Sorry typing in heat and sun. Yes redline over 2700 skips from 1100 to over 2700 (maxed 2850 before reduce throttle)with increase in throttle.

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Lenny Iszak



Joined: 23 Mar 2008
Posts: 220

PostPosted: Sun Jul 16, 2017 4:36 pm    Post subject: Re: RPM Issue Reply with quote

Make sure it's not just a displayed rpm problem. How are you getting the RPM signal?
Did your brakes start dragging? It's not easy to hold the plane in place at 2700rpm.

Below around 1400rpm the Hartzell governor will not change pitch.

If it's real RPMs, I'd call Hartzell, their tech support is awesome.


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Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 300 hrs
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jesse(at)saintaviation.co
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PostPosted: Sun Jul 16, 2017 5:46 pm    Post subject: RPM Issue Reply with quote

Add the resistor & you'll be good to go.

Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694

Sent from my iPhone

Quote:
On Jul 16, 2017, at 8:36 PM, Lenny Iszak <lenard(at)rapiddecision.com> wrote:



Make sure it's not just a displayed rpm problem. How are you getting the RPM signal?
Did your brakes start dragging? It's not easy to hold the plane in place at 2700rpm.

Below around 1400rpm the Hartzell governor will not change pitch.

If it's real RPMs, I'd call Hartzell, their tech support is awesome.

--------
Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 300 hrs




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Kelly McMullen



Joined: 16 Apr 2008
Posts: 1054
Location: Sun Lakes AZ

PostPosted: Sun Jul 16, 2017 6:21 pm    Post subject: RPM Issue Reply with quote

If the RPMs are real, that you really got 2850...which I kind of doubt or your high speed taxi would have been an airborne event..

You need to get the Lycoming service bulletin for engine overspeeds. IIRC 5% or 2835 is the threshold for inspecting and possibly replacement of some items.

-sent from the I-droid implanted in my forearm

On Sun, Jul 16, 2017 at 5:36 PM, Lenny Iszak <lenard(at)rapiddecision.com (lenard(at)rapiddecision.com)> wrote:
Quote:
--> RV10-List message posted by: "Lenny Iszak" <lenard(at)rapiddecision.com (lenard(at)rapiddecision.com)>

Make sure it's not just a displayed rpm problem. How are you getting the RPM signal?
Did your brakes start dragging? It's not easy to hold the plane in place at 2700rpm.

Below around 1400rpm the Hartzell governor will not change pitch.

If it's real RPMs, I'd call Hartzell, their tech support is awesome.

--------
Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 300 hrs




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Bob Turner



Joined: 03 Jan 2009
Posts: 774
Location: Castro Valley, CA

PostPosted: Sun Jul 16, 2017 8:33 pm    Post subject: Re: RPM Issue Reply with quote

Agree with others - check your tach. At rest or taxi speeds the mechanical prop stop should not allow 2800 RPM.

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mhealydds



Joined: 17 May 2015
Posts: 21
Location: Wichita, KS

PostPosted: Mon Jul 17, 2017 5:26 pm    Post subject: Re: RPM Issue Reply with quote

Thanks for all your help. It definitely a sensor problem after some further checking. Working on a fix. Thanks for getting my head straight.

Matt


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mhealydds



Joined: 17 May 2015
Posts: 21
Location: Wichita, KS

PostPosted: Tue Jul 18, 2017 6:40 pm    Post subject: Re: RPM Issue Reply with quote

Update for those of you that it may apply to. Turns out with latest AFS update they added the ability to customize two separate ignition settings in the RPM control menu in those with AFS and SV-EMS. This new ignition section was set to default of two pulses per 2 revolution but for six cylinder should be three pulses. One quick change and all reads OK. One of those ah ha moments I guess

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