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What kind of max RPMs are you getting from your IO540

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Mauledriver(at)nc.rr.com
Guest

Posted: Fri Oct 07, 2011 11:29 am Post subject: What kind of max RPMs are you getting from your IO540

I'm still under 40 hours on my IO540-D4A5.  On takeoff (from 350' MSL) 

I'm getting a momentary max RPM of 2690 at that point in the ground run 

when the engine speed up to it's max.  Then it settles down to 2540  for 

lift-off and initial climb.  (figures from GRT logs)



I understand the max rated power is achieved at 2700 rpms.  I'm thinking 

that's consistent with what I'm seeing.  Is it?  Are seeing similar numbers?



Thanks.



Bill "flying a little and tinkering a lot" Watson

jcumins(at)jcis.net
Guest

Posted: Fri Oct 07, 2011 12:00 pm Post subject: What kind of max RPMs are you getting from your IO540

Bill 



Sounds like the governor max stop is a bit off.  You should be able to get

2700 in flight at full power.  

John Cumins

President

707-425-7100

707-425-7576 Fax



--

Jim Combs

Joined: 24 Jan 2010
Posts: 140
Location: Lexington, Ky

Posted: Fri Oct 07, 2011 12:01 pm Post subject: What kind of max RPMs are you getting from your IO540

Are you jumping on the throttle fast enough to have the engine overrun the governor.  Especially if the oil is cool?



Sounds like it from your description and making the assumption (I know what that leads to!) that you have the prop full in for the initial takeoff and climb?

 

Jim Combs  

do not archive



On Fri, Oct 7, 2011 at 3:24 PM, Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)> wrote:

[quote] --> RV10-List message posted by: Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>

 

 I'm still under 40 hours on my IO540-D4A5.  On takeoff (from 350' MSL) I'm getting a momentary max RPM of 2690 at that point in the ground run when the engine speed up to it's max.  Then it settles down to 2540  for lift-off and initial climb.  (figures from GRT logs)

  

 I understand the max rated power is achieved at 2700 rpms.  I'm thinking that's consistent with what I'm seeing.  Is it?  Are seeing similar numbers?

 

 Thanks.

 

 Bill "flying a little and tinkering a lot" Watson

 

 

 ====================================

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

 ====================================

 http://forums.matronics.com

 ====================================

 le, List Admin.

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

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 [b]

_________________
RV-10 -> N312F - Flying as of 12/2008

Mauledriver(at)nc.rr.com
Guest

Posted: Fri Oct 07, 2011 12:15 pm Post subject: What kind of max RPMs are you getting from your IO540

That's probably true.    I do have it full forward for takeoff and     intial climb.

     

     Previous to this, my only CS prop time was about 10 hours in a     Mooney so this is new territory.

     

     Bill

     

     On 10/7/2011 3:59 PM, Jim Combs wrote:     [quote]Are you jumping on the throttle fast enough to have       the engine overrun the governor.  Especially if the oil is cool?

       

       Sounds like it from your description and making the assumption (I       know what that leads to!) that you have the prop full in for the       initial takeoff and climb?

       

       Jim Combs  

       do not archive

       

       On Fri, Oct 7, 2011 at 3:24 PM, Bill         Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>         wrote:

          	  Quote: 	
		             --> RV10-List message posted by: Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>

           

           I'm still under 40 hours on my IO540-D4A5.  On takeoff (from           350' MSL) I'm getting a momentary max RPM of 2690 at that           point in the ground run when the engine speed up to it's max.            Then it settles down to 2540  for lift-off and initial climb.            (figures from GRT logs)

           

           I understand the max rated power is achieved at 2700 rpms.            I'm thinking that's consistent with what I'm seeing.  Is it?            Are seeing similar numbers?

           

           Thanks.

           

           Bill "flying a little and tinkering a lot" Watson

           

           

           ====================================

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

           ====================================

           http://forums.matronics.com

           ====================================

           le, List Admin.

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

           ====================================

           

           

           

         

	
     [b]

Mauledriver(at)nc.rr.com
Guest

Posted: Fri Oct 07, 2011 12:16 pm Post subject: What kind of max RPMs are you getting from your IO540

That may well be the case.  Seems like it should be easy to remedy.  

Will have to hit the manuals.  Any advice welcome here.



Bill



On 10/7/2011 3:51 PM, John Cumins wrote:

[quote] 



 Bill



 Sounds like the governor max stop is a bit off.  You should be able to get

 2700 in flight at full power.

 John Cumins

 President

 707-425-7100

 707-425-7576 Fax



 --

n223rv(at)wolflakeairport
Guest

Posted: Fri Oct 07, 2011 12:27 pm Post subject: What kind of max RPMs are you getting from your IO540

I get 2700 rpm on takeoff and through climb until I dial it back....  Sounds like your governor needs a small adjustment.  Easy to do, but trial and error to set it right.  It should be in the manual.

-Mike



Sent from my iPhone



On Oct 7, 2011, at 3:24 PM, Bill Watson <Mauledriver(at)nc.rr.com> wrote:



 	  Quote: 	
		   

 

 I'm still under 40 hours on my IO540-D4A5.  On takeoff (from 350' MSL) I'm getting a momentary max RPM of 2690 at that point in the ground run when the engine speed up to it's max.  Then it settles down to 2540  for lift-off and initial climb.  (figures from GRT logs)

 

 I understand the max rated power is achieved at 2700 rpms.  I'm thinking that's consistent with what I'm seeing.  Is it?  Are seeing similar numbers?

 

 Thanks.

 

 Bill "flying a little and tinkering a lot" Watson

pitts_pilot(at)bellsouth.
Guest

Posted: Fri Oct 07, 2011 12:38 pm Post subject: What kind of max RPMs are you getting from your IO540

On 10/7/2011 3:24 PM, Bill Watson wrote:

 	  Quote: 	
		   



 I'm still under 40 hours on my IO540-D4A5.  On takeoff (from 350' MSL) 

 I'm getting a momentary max RPM of 2690 at that point in the ground 

 run when the engine speed up to it's max.  Then it settles down to 

 2540  for lift-off and initial climb.  (figures from GRT logs)

I think that's strange too.  The faster the airplane goes the higher the 
	


RPM .... to a point.  Did you get the numbers backwards?

 	  Quote: 	
		  

 I understand the max rated power is achieved at 2700 rpms.

I looked in my manual.  The HP depends on how much fuel you can feed it.
	


(CR = 8.5:1, 25 BTDC timing)

At best power the engine produces

75% power (at) 2700 RPM (at) 17+ GPH

85% power (at) 2700 RPM (at) 19- GPH

and the graph continues up to 260HP (at) 21.5 GPH!

All at 2700 RPM.



Now, upgrade to the IO-540-K (8.7:1 CR and 20 deg BTDC timing) and you get

75% power (at) 2700 RPM (at) 19 GPH

85% power (at) 2700 RPM (at) 21 GPH

and the graph continues up to 300HP (at) 24 GPH!

All at 2700 RPM.



I guess it all depends on the mission.

 	  Quote: 	
		     I'm thinking that's consistent with what I'm seeing.  Is it?  Are 

 seeing similar numbers?

I wish I could answer that.  I'm still building, and making some progress!!!
	


Linn



 	  Quote: 	
		   Thanks.



 Bill "flying a little and tinkering a lot" Watson

rv10rob(at)gmail.com
Guest

Posted: Fri Oct 07, 2011 12:46 pm Post subject: What kind of max RPMs are you getting from your IO540

If you use the MT governor from Vans and the standard engine IO-540-D4A5 you will have the low RPM problem.  See the governor manual, but I believe a complete turn of the high RPM stop screw yields a RPM increase of 50.  Quick, simple adjustment.  

  

With that set properly, you may see RPM above 2700 if you advance the throttle quickly for takeoff.  That requires a propeller adjustment (see your prop manual).

 

-Rob

 On Fri, Oct 7, 2011 at 1:13 PM, Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)> wrote:

[quote] --> RV10-List message posted by: Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>

 



 That may well be the case.  Seems like it should be easy to remedy.  Will have to hit the manuals.  Any advice welcome here.

 

 Bill

 

 On 10/7/2011 3:51 PM, John Cumins wrote:

 

[quote] -->  RV10-List message posted by: "John Cumins"<jcumins(at)jcis.net (jcumins(at)jcis.net)>

 

 Bill

 

 Sounds like the governor max stop is a bit off.  You should be able to get

 2700 in flight at full power.

 

 

 John Cumins

 President

 [url=tel:707-425-7100]707-425-7100[/url]

 [url=tel:707-425-7576]707-425-7576[/url] Fax

 

 

 

 --

dave.saylor.aircrafters(a
Guest

Posted: Fri Oct 07, 2011 1:12 pm Post subject: What kind of max RPMs are you getting from your IO540

I like to see a tiny bit over 2700, like 10 or 20 rpm. You should be able to get that right from the start.  Power increases about proportionally with rpm so running 100 low loses you several horses. 



Wish I could see MP at ambient...



--Dave

On Oct 7, 2011, at 15:24, Bill Watson <Mauledriver(at)nc.rr.com> wrote:



 	  Quote: 	
		   

 

 I'm still under 40 hours on my IO540-D4A5.  On takeoff (from 350' MSL) I'm getting a momentary max RPM of 2690 at that point in the ground run when the engine speed up to it's max.  Then it settles down to 2540  for lift-off and initial climb.  (figures from GRT logs)

 

 I understand the max rated power is achieved at 2700 rpms.  I'm thinking that's consistent with what I'm seeing.  Is it?  Are seeing similar numbers?

 

 Thanks.

 

 Bill "flying a little and tinkering a lot" Watson

Kellym

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

Posted: Fri Oct 07, 2011 1:31 pm Post subject: What kind of max RPMs are you getting from your IO540

Those fuel flows sound low for full power. I would expect 22-23 gph, 

because a 200 hp Lycoming needs ~17gph on takeoff to have EGT where you 

want it, roughly 200 ROP, or about 1250F.  300 hp engine should need 

around 26-27. I know an IO550 Continental with 310 hp needs 29-30 gph 

for takeoff.

On 10/7/2011 1:34 PM, Linn Walters wrote:

 	  Quote: 	
		   -I looked in my manual.  The HP depends on how much fuel you can feed it.

 (CR = 8.5:1, 25 BTDC timing)

 At best power the engine produces

 75% power (at) 2700 RPM (at) 17+ GPH

 85% power (at) 2700 RPM (at) 19- GPH

 and the graph continues up to 260HP (at) 21.5 GPH!

 All at 2700 RPM.

 Now, upgrade to the IO-540-K (8.7:1 CR and 20 deg BTDC timing) and you 

 get

 75% power (at) 2700 RPM (at) 19 GPH

 85% power (at) 2700 RPM (at) 21 GPH

 and the graph continues up to 300HP (at) 24 GPH!

 All at 2700 RPM.

 I guess it all depends on the mission.

>   I'm thinking that's consistent with what I'm seeing.  Is it?  Are 

> seeing similar numbers?

 I wish I could answer that.  I'm still building, and making some 

 progress!!!

 Linn

> Thanks.

>

> Bill "flying a little and tinkering a lot" Watson

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

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Fri Oct 07, 2011 4:31 pm Post subject: Re: What kind of max RPMs are you getting from your IO540

My YIO-540-D4A5 data plate says it's certified for 260 HP at 2700 RPM, or 250 HP at 2600 RPM.



My guess is the effective (power to the airplane) power loss with lower RPM is smaller than that 10 HP, since the prop is less efficient at the higher RPM's.



I have the Hartzell governor, and it came pre-adjusted to 2650 RPM. I haven't bothered to tweak it upwards yet, and I'm wondering if I ever will. I like the idea of keeping the noise down a bit, and I certainly don't need the power from my home airport (400' MSL). Of course, if I'm at Leadville on a hot day and heavy, I may wish I had every HP available.

_________________
Bob Turner
RV-10 QB

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Fri Oct 07, 2011 4:36 pm Post subject: Re: What kind of max RPMs are you getting from your IO540

PS to Bill:



You shouldn't be seeing a 150 RPM overrun of the governor, if you're taking at least a full second or more to push the throttle in. Either the oil hasn't warmed up, or the oil passage is clogged a bit, or something else. You do test the prop once or twice during run up, to get warm oil up there, right?

_________________
Bob Turner
RV-10 QB

Kelly McMullen

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

Posted: Fri Oct 07, 2011 6:18 pm Post subject: What kind of max RPMs are you getting from your IO540

Given the acceleration of the -10, on all but a sub-1000ft strip, I

would ease the throttle in slowly enough that you are at rotation

speed when you got full throttle(i.e. more than 5 sec). I don't like

to shock the plugs or cylinders with rapid throttle increases, and

learned years ago that very slow throttle addition prevented rock

dings in the prop when operating off gravel strips.



On Fri, Oct 7, 2011 at 6:20 PM, Bill Watson <Mauledriver(at)nc.rr.com> wrote:

 	  Quote: 	
		   



 I do test, just once, and very briefly.  It's the way I was taught.  I'm

 taking more than a second to push the throttle.



 I'll be paying a lot more attention to these things the next couple of

 takeoffs - we'll see.

 On 10/7/2011 8:36 PM, Bob Turner wrote:

>

> 

>

> PS to Bill:

>

> You shouldn't be seeing a 150 RPM overrun of the governor, if you're

> taking at least a full second or more to push the throttle in. Either the

> oil hasn't warmed up, or the oil passage is clogged a bit, or something

> else. You do test the prop once or twice during run up, to get warm oil up

> there, right?

>

> --------

> Bob Turner

> RV-10 QB

>

>

> Read this topic online here:

>

> http://forums.matronics.com/viewtopic.php?p=354354#354354

>

>

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

Mauledriver(at)nc.rr.com
Guest

Posted: Sat Oct 15, 2011 3:16 pm Post subject: What kind of max RPMs are you getting from your IO540

Coda; I pulled out the governor manual and a procedure for both     static testing and in-flight testing were spelled out.  I decided to     leave the static alone and just do the inflight test.  Made the     adjustment required and overshot by 30 rpms or so.  Readjusted and     ready to go.  Very simple and straight forward.

     

     I tried a much slower application of power during takeoff and no     longer have the "overspeed" situation.  

     

     Thanks all.

     

     On 10/7/2011 4:43 PM, Rob Kochman wrote:     [quote]       If you use the MT governor from Vans and the standard engine         IO-540-D4A5 you will have the low RPM problem.  See the governor         manual, but I believe a complete turn of the high RPM stop screw         yields a RPM increase of 50.  Quick, simple adjustment.  

        

       With that set properly, you may see RPM above 2700 if you         advance the throttle quickly for takeoff.  That requires a         propeller adjustment (see your prop manual).

        

       -Rob

                [quote]

           [quote]                            -->  RV10-List message posted by: "John Cumins"<jcumins(at)jcis.net (jcumins(at)jcis.net)>

               

               Bill

               

               Sounds like the governor max stop is a bit off.  You               should be able to get

               2700 in flight at full power.

               

               

               

               --

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