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help with actual engine performance

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luckymacy(at)comcast.net
Guest

Posted: Fri Mar 24, 2006 3:36 pm Post subject: help with actual engine performance

My EFIS isn't quite dialed in yet but I recorded the following numbers today and want a second opinion on whether or not these are close.



I have a 200hp angle valved engine.



My max full throttle highest fuel flow was ~20 gph and my highest MP was 22.95 but that last number is the one I think is way off and I need to figure out how to tweak my settings to compute correctly. Take off altitude was 440 feet and I forgot the barometric pressure but it was around 30.0



What would angle engine owners expect to see for MP given this approximate scenario?



thx,

lucky



My EFIS isn't quite dialed in yet but I recorded the following numbers today and want a second opinion on whether or not these are close.



I have a 200hp angle valved engine.



My max full throttle highest fuel flow was ~20 gph and my highest MP was 22.95 but that last number is the one I think is way off and I need to figure out how to tweak my settings to compute correctly.Take off altitude was 440 feet and I forgot the barometric pressure but it was around 30.0



What would angle engine owners expect to see for MP given this approximate scenario?



thx,

lucky

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kboatright1(at)comcast.ne
Guest

Posted: Fri Mar 24, 2006 3:57 pm Post subject: help with actual engine performance

What does your MP gauge read when the engine is stopped?  It should read 29 

or inches, depending on field elevation.  On takeoff, it should read 

slightly lower than that - maybe 1/2 or 1 inch due to induction system 

losses.



KB

---

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khorton01(at)rogers.com
Guest

Posted: Fri Mar 24, 2006 3:59 pm Post subject: help with actual engine performance

On 24 Mar 2006, at 18:32, lucky wrote:



 	  Quote: 	
		   



 My EFIS isn't quite dialed in yet but I recorded the following  

 numbers today and want a second opinion on whether or not these are  

 close.



 I have a 200hp angle valved engine.



 My max full throttle highest fuel flow was ~20 gph and my highest  

 MP was 22.95 but that last number is the one I think is way off and  

 I need to figure out how to tweak my settings to compute correctly.  

 Take off altitude was 440 feet and I forgot the barometric pressure  

 but it was around 30.0


	


Lucky,



As you suspect, something is fouled up somewhere.  At 440 ft ASL,  

with an altimeter setting of 30.00, the actual atmospheric pressure  

would be about 29.5 in HG.  The manifold pressure at full throttle at  

low speed should be around an inch less than the atmospheric  

pressure, plus or minus.



So, you either have a false MP indication, or a very significant  

restriction in your induction system, or your throttle is not getting  

full open.



Are you sure that your throttle plate is getting full open?



Which MP gauge or engine indication system do you have?



Kevin Horton         RV-8 (finishing kit)

Ottawa, Canada

http://www.kilohotel.com/rv8

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luckymacy(at)comcast.net
Guest

Posted: Fri Mar 24, 2006 4:58 pm Post subject: help with actual engine performance

forget the MP part.  That's just me talking out loud.  I have to figure out how to make my spreadsheet algorithm match reality.  It displays "right" in the cockpit but the GRT recorded data for MP is 'raw' data and not the processed value that's displayed.

Really my question is does the 20 gallons per hour seem right for a 200 hp engine making full power near sea level?

-------------- Original message -------------- 

From: Kevin Horton <khorton01(at)rogers.com> 

 	  Quote: 	

 On 24 Mar 2006, at 18:32, lucky wrote: 

 > 

 > 

 > My EFIS isn't quite dialed in yet but I recorded the following 

 > numbers today and want a second opinion on whether or not these are 

 > close. 

 > 

 > I have a 200hp angle valved engine. 

 > 

 > My max full throttle highest fuel flow was ~20 gph and my highest 

 > MP was 22.95 but that last number is the one I think is way off and 

 > I need to figure out how to tweak my settings to compute correctly. 

 > Take off altitude was 440 feet and I forgot the barometric pressure 

 > but it was around 30.0 

 Lucky, 

 As you suspect, something is fouled up somewhere. At 440 ft ASL, 

 with an altimeter setting of 30.00, the actual atmospheric pressure 

 would be about 29.5 in HG. The manifold pressure at full throttle at 

 low speed should be around an inch less than the atmospheric 

 pressure, plus or minus. 

 So, you either have a false MP indication, or a very significant 

 restriction in your induction system, or your throttle is not getting 

 full open. 

 Are you sure that your throttle plate is getting full open? 

 Which MP gauge or engine indication system do you have? 

 Kevin Horton RV-8 (finishing kit) 

 Ottawa, Canada 

 http://www.kilohotel.com/rv8 

forget the MP part. That's just me talking out loud. I have to figure out how to make my spreadsheet algorithm match reality. It displays "right" in the cockpit but the GRT recorded data for MP is 'raw' data and not the processed value that's displayed.

Really my question is does the 20 gallons per hour seem right for a 200 hp engine making full powernear sea level?

-------------- Original message -------------- 

From: Kevin Horton khorton01(at)rogers.com 

 -- RV-List message posted by: Kevin Horton <KHORTON01(at)ROGERS.COM>

 On 24 Mar 2006, at 18:32, lucky wrote: 

  -- RV-List message posted by: luckymacy(at)comcast.net (lucky) 

  My EFIS isn't quite dialed in yet but I recorded the following 

  numbers today and want a second opinion on whether or not these are 

  close. 

  I have a 200hp angle valved engine. 

  My max full throttle highest fuel flow was ~20 gph and my highest 

  MP was 22.95 but that last number is the one I think is way off and 

  I need to figure out how to tweak my settings to compute correctly. 

  Take off altitude was 440 feet and I forgot the

  barometric pressure 

  but it was around 30.0 

 Lucky, 

 As you suspect, something is fouled up somewhere. At 440 ft ASL, 

 with an altimeter setting of 30.00, the actual atmospheric pressure 

 would be about 29.5 in HG. The manifold pressure at full throttle at 

 low speed should be around an inch less than the atmospheric 

 pressure, plus or minus. 

 So, you either have a false MP indication, or a very significant 

 restriction in your induction system, or your throttle is not getting 

 full open. 

 Are you sure that your throttle plate is getting full open? 

 Which MP gauge or engine indication system do you have? 

 Kevin Horton RV-8 (finishing kit) 

 Ottawa, Canada 

 http://www.kilohotel.com/rv8

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Kellym

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

Posted: Fri Mar 24, 2006 6:36 pm Post subject: help with actual engine performance

Yes, 20gph is close, perhaps a hair rich, but a good number. I've heard 

of as low as 17gph, but that is on the lean side.

do not archive

lucky wrote:

 	  Quote: 	

 forget the MP part.  That's just me talking out loud.  I have to figure out how to make my spreadsheet algorithm match reality.  It displays "right" in the cockpit but the GRT recorded data for MP is 'raw' data and not the processed value that's displayed.

 Really my question is does the 20 gallons per hour seem right for a 200 hp engine making full power near sea level?

 -------------- Original message -------------- 

 From: Kevin Horton <khorton01(at)rogers.com> 

> 

>

> On 24 Mar 2006, at 18:32, lucky wrote: 

>

>> 

>>

>> My EFIS isn't quite dialed in yet but I recorded the following 

>> numbers today and want a second opinion on whether or not these are 

>> close. 

>>

>> I have a 200hp angle valved engine. 

>>

>> My max full throttle highest fuel flow was ~20 gph and my highest 

>> MP was 22.95 but that last number is the one I think is way off and 

>> I need to figure out how to tweak my settings to compute correctly. 

>> Take off altitude was 440 feet and I forgot the barometric pressure 

>> but it was around 30.0 

> Lucky, 

>

> As you suspect, something is fouled up somewhere. At 440 ft ASL, 

> with an altimeter setting of 30.00, the actual atmospheric pressure 

> would be about 29.5 in HG. The manifold pressure at full throttle at 

> low speed should be around an inch less than the atmospheric 

> pressure, plus or minus. 

>

> So, you either have a false MP indication, or a very significant 

> restriction in your induction system, or your throttle is not getting 

> full open. 

>

> Are you sure that your throttle plate is getting full open? 

>

> Which MP gauge or engine indication system do you have? 

>

> Kevin Horton RV-8 (finishing kit) 

> Ottawa, Canada 

> http://www.kilohotel.com/rv8 

>

>

>

 forget the MP part. That's just me talking out loud. I have to figure out how to make my spreadsheet algorithm match reality. It displays "right" in the cockpit but the GRT recorded data for MP is 'raw' data and not the processed value that's displayed.

 Really my question is does the 20 gallons per hour seem right for a 200 hp engine making full powernear sea level?

 -------------- Original message -------------- 

 From: Kevin Horton khorton01(at)rogers.com 

  -- RV-List message posted by: Kevin Horton <KHORTON01(at)ROGERS.COM>

  On 24 Mar 2006, at 18:32, lucky wrote: 

   -- RV-List message posted by: luckymacy(at)comcast.net (lucky) 

   My EFIS isn't quite dialed in yet but I recorded the following 

   numbers today and want a second opinion on whether or not these are 

   close. 

   I have a 200hp angle valved engine. 

   My max full throttle highest fuel flow was ~20 gph and my highest 

   MP was 22.95 but that last number is the one I think is way off and 

   I need to figure out how to tweak my settings to compute correctly. 

   Take off altitude was 440 feet and I forgot the

   barometric pressure 

   but it was around 30.0 

  Lucky, 

  As you suspect, something is fouled up somewhere. At 440 ft ASL, 

  with an altimeter setting of 30.00, the actual atmospheric pressure 

  would be about 29.5 in HG. The manifold pressure at full throttle at 

  low speed should be around an inch less than the atmospheric 

  pressure, plus or minus. 

  So, you either have a false MP indication, or a very significant 

  restriction in your induction system, or your throttle is not getting 

  full open. 

  Are you sure that your throttle plate is getting full open? 

  Which MP gauge or engine indication system do you have? 

  Kevin Horton RV-8 (finishing kit) 

  Ottawa, Canada 

  http://www.kilohotel.com/rv8

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

Charles Heathco

Joined: 10 Jan 2006
Posts: 201

Posted: Sat Mar 25, 2006 7:28 pm Post subject: help with actual engine performance

Holy toledo! 20gph is considered normal?? No wander the glaciers are melting. Chas

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