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Fuel Pressure on a 914

Matronics Email Lists Forum Index -> RotaxEngines-List

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pestar

Joined: 11 Apr 2007
Posts: 61
Location: Auckland, New Zealand

Posted: Tue Jul 13, 2010 1:09 pm Post subject: Fuel Pressure on a 914

Background



Building a MCR-4S (dynaero.com) with a 914 fitted with an intercooler.  Have MGL instrumentation with fuel flow monitoring.  Had thought about monitoring fuel pressure which leads to the following questions.



1. Does anyone monitor fuel pressure on their 914 and what value do they get out of it.



2.  If you have done it where did you mount the sender as my first impression of doing this looks as so you have to hack into the Rotax pipework which I would prefer not if it can be avoided.



3. What value sender did you use and what type.



Appreciate your comments.



Peter Armstrong

Auckland, New Zealand

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kenryan

Joined: 20 Oct 2009
Posts: 426

Posted: Tue Jul 13, 2010 5:15 pm Post subject: Fuel Pressure on a 914

 	  Quote: 	
		  From Understanding the Rotax 914 document located here:


	


http://www.rotax-owner.com/pdf/UNDERSTANDING%20THE%20914%20ROTAX.pdf

 

Indicates fuel pressure is best monitored in relation to airbox pressure:



Maximum fuel pressure is 0.35 BAR (5.08 PSI or 10.36”) above airbox pressure

Minimum fuel pressure is 0.15 BAR (2.18 PSI or 4.45”) above airbox pressure

 Normal fuel pressure is 0.25 BAR (3.63 PSI or 7.41”) above airbox pressure



Gauge for monitoring this way can be found here:



http://www.aircraftspruce.com/catalog/inpages/umadiff1.php

 



Ken Ryan

Anchorage, Alaska

On Tue, Jul 13, 2010 at 1:09 PM, pestar <peter(at)reivernet.com (peter(at)reivernet.com)> wrote:

  	  Quote: 	
		  --> RotaxEngines-List message posted by: "pestar" <peter(at)reivernet.com (peter(at)reivernet.com)>

  

 Background

 

 Building a MCR-4S (dynaero.com) with a 914 fitted with an intercooler.  Have MGL instrumentation with fuel flow monitoring.  Had thought about monitoring fuel pressure which leads to the following questions.

  

 1. Does anyone monitor fuel pressure on their 914 and what value do they get out of it.

 

 2.  If you have done it where did you mount the sender as my first impression of doing this looks as so you have to hack into the Rotax pipework which I would prefer not if it can be avoided.

 

 3. What value sender did you use and what type.

 

 Appreciate your comments.

 

 Peter Armstrong

 Auckland, New Zealand

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=304701#304701

 

 

 

 

 

 

 

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craig(at)craigandjean.com
Guest

Posted: Tue Jul 13, 2010 5:28 pm Post subject: Fuel Pressure on a 914

"Requires  the use of a 1EU007D UMA different pressure sender."

  

 MGL/USA supplies a version of a non-differential UMA sender  that works with the MGL RDAC. Check with them to see if they can provide the  same mod in the differential sender. Or it may be that the differential sender  doesn't need the (electrical) mod. As I recall it had to do the the output of  the older op-amp in the UMA sender.

  

 -- Craig



   From:  owner-rotaxengines-list-server(at)matronics.com  [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Ken  Ryan

Sent: Tuesday, July 13, 2010 6:14 PM

To:  rotaxengines-list(at)matronics.com

Subject: Re: Fuel  Pressure on a 914

 

 	  Quote: 	
		  From Understanding the Rotax 914 document located  here:


	


http://www.rotax-owner.com/pdf/UNDERSTANDING%20THE%20914%20ROTAX.pdf



Indicates  fuel pressure is best monitored in relation to airbox pressure:



Maximum  fuel pressure is 0.35 BAR (5.08 PSI or 10.36”) above airbox pressure

Minimum  fuel pressure is 0.15 BAR (2.18 PSI or 4.45”) above airbox pressure

Normal  fuel pressure is 0.25 BAR (3.63 PSI or 7.41”) above airbox pressure



Gauge  for monitoring this way can be found here:



http://www.aircraftspruce.com/catalog/inpages/umadiff1.php

Ken  Ryan

Anchorage, Alaska

 On Tue, Jul 13, 2010 at 1:09 PM, pestar <peter(at)reivernet.com (peter(at)reivernet.com)> wrote:

  	  Quote: 	
		  -->    RotaxEngines-List message posted by: "pestar" <peter(at)reivernet.com (peter(at)reivernet.com)>



Background



Building    a MCR-4S (dynaero.com) with a    914 fitted with an intercooler.  Have MGL instrumentation with fuel flow    monitoring.  Had thought about monitoring fuel pressure which leads to    the following questions.



1. Does anyone monitor fuel pressure on their    914 and what value do they get out of it.



2.  If you have done it    where did you mount the sender as my first impression of doing this looks as    so you have to hack into the Rotax pipework which I would prefer not if it can    be avoided.



3. What value sender did you use and what    type.



Appreciate your comments.



Peter Armstrong

Auckland, New    Zealand





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=304701#304701



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