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"MAG" Check

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imap8ntr(at)cox.net
Guest

Posted: Sat Aug 07, 2010 8:19 pm Post subject: "MAG" Check

The Jab engine manual has all these operating limitation parameters.   I do 

my mag check at about 2000RPM and the drop parameters I think are less than 

100RPM drop and less than 100 from side to side.  This is from memory but I 

know the manual states these figures.  I have these figures printed in my 

engine run up checklist.  I never get a carb heat drop unless there is some 

icing in the carburetor.  Not exactly sure why but I think it has something 

to do with the Bing being set up as "altitude compensating."



Ivan

Phoenix, AZ

---

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Sun Aug 08, 2010 2:35 am Post subject: "MAG" Check

The Jab engine doesn't drop like a Lycoming when you earth one side. 

It's more of a sensation than a drop, on an analogue tach it's only a

quiver on the needle.

Something to do with spark plug positions I imagine. On a big ole gas

guzzler they are a lot further apart.

The carb heat again doesn't do much on the ground, both tests show a

little more clearly in the air.

I usually use 1800 as well to answer your question.

Regards, Clive



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JohnDRead(at)AOL.COM
Guest

Posted: Sun Aug 08, 2010 9:48 am Post subject: "MAG" Check

Hi Guys;

             I  recall from the Jabiru installation instructions the carb heat is always on so  there should not be any RPM drop. 

  

 do not archive

  

 Regards,  John



CH701 - Colorado - Jabiru 3300



Cell: 719-494-4567

Home:  303-648-3261   

  In a message dated 8/7/2010 10:19:51 P.M. Mountain Daylight Time,  imap8ntr(at)cox.net writes:

  	  Quote: 	
		  -->    JabiruEngine-List message posted by: "Ivan"    <imap8ntr(at)cox.net>



The Jab engine manual has all these operating    limitation parameters.   I do 

my mag check at about 2000RPM and    the drop parameters I think are less than 

100RPM drop and less than 100    from side to side.  This is from memory but I 

know the manual states    these figures.  I have these figures printed in my 

engine run up    checklist.  I never get a carb heat drop unless there is some 

icing    in the carburetor.  Not exactly sure why but I think it has something    

to do with the Bing being set up as "altitude    compensating."



Ivan

Phoenix, AZ

----- Original Message    ----- 

From: "MHerder" <michaelherder(at)beckgroup.com>

To:    <jabiruengine-list(at)matronics.com>

Sent: Saturday, August 07, 2010    8:28 PM

Subject: "MAG" Check

 	  Quote: 	
		   -->    JabiruEngine-List message posted by: "MHerder" 

    <michaelherder(at)beckgroup.com>



 What RPM are you doing    your "Mag" Check at?  What's a normal drop?  I was 

 trying    1800 RPM and am not getting a noticable drop, also not getting a 

    noticeable drop when I kick in the carb heat?



 Engine has about    .9 hr of ground run time on it and we're still working 

 out some    kinks.



 I guess we call a "mag" check a  coil or orgnition    check on a Jab?



 I'm using the Grand Rapids EIS and noticed    that there are two sensitivity 

 settings on the tach, but I want to    get some go no go parameters from some 

 folks.



    Thanks



 --------

 One Rivet at a    Time!





 Read this topic online    here:



    http://forums.matronics.com/viewtopic.php?p=307893#307893



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jcrowder(at)lpbroadband.n
Guest

Posted: Sun Aug 08, 2010 10:25 am Post subject: "MAG" Check

Not on mine.  I am finishing my 3300 install and my air box has a diverter flap controlled by a push/pull cable I have installed.  

Jim Crowder  

   

Installing a 3300 in a Kitfox 5  

Northern Colorado  

       

From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of JohnDRead(at)aol.com

 Sent: Sunday, August 08, 2010 10:47 AM

 To: jabiruengine-list(at)matronics.com

 Subject: Re: "MAG" Check  

  

  

     

Hi Guys;  

    

            I recall from the Jabiru installation instructions the carb heat is always on so there should not be any RPM drop.   

    

   

    

do not archive  

    

   

    

Regards, John

 

 CH701 - Colorado - Jabiru 3300

 

 Cell: 719-494-4567

 Home: 303-648-3261     

   

      

In a message dated 8/7/2010 10:19:51 P.M. Mountain Daylight Time, imap8ntr(at)cox.net writes:  

  [quote]  

--> JabiruEngine-List message posted by: "Ivan" <imap8ntr(at)cox.net>

 

 The Jab engine manual has all these operating limitation parameters.   I do 

 my mag check at about 2000RPM and the drop parameters I think are less than 

 100RPM drop and less than 100 from side to side.  This is from memory but I 

 know the manual states these figures.  I have these figures printed in my 

 engine run up checklist.  I never get a carb heat drop unless there is some 

 icing in the carburetor.  Not exactly sure why but I think it has something 

 to do with the Bing being set up as "altitude compensating."

 

 Ivan

 Phoenix, AZ

 

 

 ---

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Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Sun Aug 08, 2010 2:48 pm Post subject: "MAG" Check

Try your mag check at different, typically lower, rpms- 1100-1300 range will normally result in 10-30 rpm drop.  Try it at idle or in cruise flight and it's pretty obvious as well.  You should also be able to hear a change in engine sound even if no evidence showing on tach...

    

   Possum

   

 

   

 

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_________________
From The PossumWorks...

DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Mon Aug 09, 2010 11:29 am Post subject: Re:

As to no RPM drop with carb heat application on the ground, I ditto that.  I believe the low amount of air running over the heat muff helps cause this.  You will notice an RPM reduction if flight with carb heat once you get flying.



Good luck,

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_________________
David Gallagher
Cincinnati, OH area

Kayberg(at)aol.com
Guest

Posted: Mon Aug 09, 2010 11:52 am Post subject: "MAG" Check

In a message dated 8/9/2010 3:30:51 P.M. Eastern Daylight Time,  david.m.gallagher(at)ge.com writes:

  	  Quote: 	
		  -->    JabiruEngine-List message posted by: "DaveG601XL"    <david.m.gallagher(at)ge.com>



As to no RPM drop with carb heat    application on the ground, I ditto that.  I believe the low amount of air    running over the heat muff helps cause this.  You will notice an RPM    reduction if flight with carb heat once you get flying.



Good    luck,



	


 

  

 Because the spark plugs are only a couple inches away from each other,  there will be very little mag drop.  Some of us have flown WITHOUT carb  heat for several years, so dont expect too much from that either.

  

 In short, it is not a Lycon engine with the plugs on opposite sides of the  cylinders, nor does it have an ice-making venturi carb like the Marvel-Dribbler  or Strombad.    

  

 I just check the switches while taxiing out and note if it is revving up on  takeoff.   If the one mag is not working, you will find it out quickly  when you hit the switch, but you can have a dead one in the air and not know  it.   

  

 IMHO

  

 Doug Koenigsberg

  [quote][b]

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checkpoint2(at)comcast.ne
Guest

Posted: Mon Aug 09, 2010 12:07 pm Post subject: "MAG" Check

I concur completely after 250 hours on MOGAS Jabiru. Bob Haas.  

         

  

From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Kayberg(at)aol.com

 Sent: Monday, August 09, 2010 3:52 PM

 To: jabiruengine-list(at)matronics.com

 Subject: Re: JabiruEngine-List: Re: "MAG" Check  

  

       

In a message dated 8/9/2010 3:30:51 P.M. Eastern Daylight Time, david.m.gallagher(at)ge.com writes:  

   	  Quote: 	
		    

--> JabiruEngine-List message posted by: "DaveG601XL" <david.m.gallagher(at)ge.com>

 

 As to no RPM drop with carb heat application on the ground, I ditto that.  I believe the low amount of air running over the heat muff helps cause this.  You will notice an RPM reduction if flight with carb heat once you get flying.

 

 Good luck,  	
  

    

   

    

Because the spark plugs are only a couple inches away from each other, there will be very little mag drop.  Some of us have flown WITHOUT carb heat for several years, so dont expect too much from that either.  

    

   

    

In short, it is not a Lycon engine with the plugs on opposite sides of the cylinders, nor does it have an ice-making venturi carb like the Marvel-Dribbler or Strombad.      

    

   

    

I just check the switches while taxiing out and note if it is revving up on takeoff.   If the one mag is not working, you will find it out quickly when you hit the switch, but you can have a dead one in the air and not know it.     

    

   

    

IMHO  

    

   

    

Doug Koenigsberg  

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