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lycoming dual mag D engine alternative mag question

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CardinalNSB(at)aol.com
Guest

Posted: Thu Jan 18, 2007 7:46 am Post subject: lycoming dual mag D engine alternative mag question

I got a D engine O-320 H2AD as part of a project, in good condition,  already mounted so I want to keep it.  It needs a mag rebuild.  This  is the "D" mag, dual drive, allegedly more failure prone because of a common  drive gear.

  

 1.  any recommendations on upgrades to the D mag while still keeping  the D mag engine certified

  

 2.  any information/recommendations  on using a "crank trigger"  ignition as the source for firing the second set of plugs?  from what I  read in hot rod magazine these are old hat in big hp stressed engines, maybe a  Megasquirt with 4 separate coils?    This would avoid the single  point failure of the drive gear, and would be fun to play with timing  changes.

  

 I'll keep the carb for now.

  

 Is there an easy conversion to use a single regular mag driven off the  accessory case?

  

 While I am here, what is the latest information re roller cam followers for  this engine, there is no T modification done to this engine.

  

 This is in an experimental so I could ....

  

 Thanks for any help, Skip Simpson

  [quote][b]

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archie97(at)earthlink.net
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Posted: Thu Jan 18, 2007 3:12 pm Post subject: lycoming dual mag D engine alternative mag question

[quote] ---

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glcasey(at)adelphia.net
Guest

Posted: Fri Jan 19, 2007 5:38 am Post subject: lycoming dual mag D engine alternative mag question

 	  Quote: 	
		  

The most straightforward thing to do is have the D mag rebuilt with  
	


all the AD's complied with.  If that is done the reliability is  

reported to be as good as that of dual mags.  If you want a  

performance increase I believe you can buy a Lightspeed ignition with  

a crank trigger that would fire half the plugs.  You can bolt a  

single mag, presumably without an impulse coupling, in the place of  

the dual.  A third option is to convert the accessory case to a dual  

drive, but I doubt if the H engine allows that.

Gary Casey

 	  Quote: 	
		   Time: 07:46:17 AM PST US

 From: CardinalNSB(at)aol.com

 Subject: lycoming dual mag D engine alternative mag  

 question



 I got a D engine O-320 H2AD as part of a project, in good  

 condition,  already

 mounted so I want to keep it.  It needs a mag rebuild.  This  is  

 the "D" mag,

 dual drive, allegedly more failure prone because of a common  drive  

 gear.



 1.  any recommendations on upgrades to the D mag while still  

 keeping  the D

 mag engine certified



 2.  any information/recommendations  on using a "crank trigger"   

 ignition as

 the source for firing the second set of plugs?  from what I  read  

 in hot rod

 magazine these are old hat in big hp stressed engines, maybe a   

 Megasquirt with



 4 separate coils?    This would avoid the single  point failure of  

 the drive

 gear, and would be fun to play with timing  changes.



 I'll keep the carb for now.



 Is there an easy conversion to use a single regular mag driven off the

 accessory case?



 While I am here, what is the latest information re roller cam  

 followers for

 this engine, there is no T modification done to this engine.



 This is in an experimental so I could ....



 Thanks for any help, Skip Simpson

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Jan 19, 2007 6:47 am Post subject: lycoming dual mag D engine alternative mag question

If you are taking votes I would vote for the single mag and the Lightspeed

CDI combi... 



Noel

Do not archive.... See sometimes I do remember.

[quote] --

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

w_sweet(at)comcast.net
Guest

Posted: Fri Jan 19, 2007 7:32 am Post subject: lycoming dual mag D engine alternative mag question

I agree with this idea. However, make sure you do a mag check at the end of 

every flight, so if the mag died in flight, you can fix it before the next 

flight, since you will see no noticeable indications in flight. The mag in a 

LSE CDI - mag combo is there just in case, since it does little or nothing; 

turning off the mag on a regular mag check shows no RPM drop, at least in my 

initial installation. I now have dual LSE CDI's and had to warn a CFI giving 

me a biennual check that there would be no RPM drop when shutting off either 

CDI. That says something about how efficient those CDI's are.

Wayne



---

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Gosh2Fly(at)aol.com
Guest

Posted: Sat Jan 20, 2007 6:59 am Post subject: lycoming dual mag D engine alternative mag question

Skip' I presently fly an Acro Sport with a 0320H2AD. I have used both the  crank sensor with the elecr. unit. and 3000 series dual mag. The 3000  series mag was rebuilt and has not given me any trouble. I also use the  SilverHawk fuel injection system on the  0320H2AD 

  [quote][b]

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