---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Thu 01/18/07: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:46 AM - lycoming dual mag D engine alternative mag question (CardinalNSB@aol.com) 2. 03:12 PM - lycoming dual mag D engine alternative mag question (Archie) 3. 06:32 PM - Archie -- stroked O-200? (jrc) 4. 07:01 PM - Re: Archie -- stroked O-200? (Archie) ________________________________ Message 1 _____________________________________ Time: 07:46:17 AM PST US From: CardinalNSB@aol.com Subject: Engines-List: 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 ________________________________ Message 2 _____________________________________ Time: 03:12:57 PM PST US From: "Archie" Subject: Engines-List: lycoming dual mag D engine alternative mag question ----- Original Message ----- From: CardinalNSB@aol.com To: engines-list@matronics.com Sent: Thursday, January 18, 2007 10:45 AM Subject: Engines-List: 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 converted an O-200 to full msd crank trigger years ago. Took a bit of work, but certainly worth it. Easier starting, more accurate timing, (off the crank), and no sloppy gears, plus plug gaps of .080 Megasquirt with individual coils is also a viable alternative. Archie 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 ________________________________ Message 3 _____________________________________ Time: 06:32:29 PM PST US From: "jrc" Subject: Engines-List: Archie -- stroked O-200? Archie, would it be possible to stroke an experimental O-200, and if so, about how much? JimC ----- Original Message ----- From: Archie To: engines-list@matronics.com Sent: Thursday, January 18, 2007 5:09 PM Subject: Engines-List: lycoming dual mag D engine alternative mag question ________________________________ Message 4 _____________________________________ Time: 07:01:37 PM PST US From: "Archie" Subject: Re: Engines-List: Archie -- stroked O-200? ----- Original Message ----- From: jrc To: engines-list@matronics.com Sent: Thursday, January 18, 2007 9:31 PM Subject: Engines-List: Archie -- stroked O-200? Archie, would it be possible to stroke an experimental O-200, and if so, about how much? JimC Yes, but it requires custom pistons, and the overall cost would not be worth it. I did a special O-200 that produced 161hp at 2700. (stock stroke) For what it cost to develop, the customer could have bought a brand new O-360 engine and then some. 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