=20 Sent: Monday, June 11, 2007 8:56 AM Subject: [FlyRotary] Re: Spark Plug Cleaning SAG can appear any where apparently. We ran a MSD system on our race care and still ran into the problem. The problem ended when we switched to alcohol, but thats not a fix for airplanes! =09 Bob Mears Supermarine spitfire =09 =09 =09 =20 ------_=_NextPart_001_01C7AC77.17157E5E Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

In the event of an alternator failure these = high energy=20 coils may lead to decreased flight time. So two MSD coils on the problem = spark=20 plugs (leading ?) and two normal LS1 coils for the other plugs set. With = a=20 disable switch for limp home mode. This would almost be like the = Split=20 Spark mode on the Microtech ECU.

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J.=20 Hughes
Sent: Monday, June 11, 2007 10:24 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: MSD type Ignition = CD or=20 not? was Re: Spark Plug Cleaning

It would be nice to get 50 hrs on a set of = plugs running=20 100LL. Is it the leading or trailing plugs that seem to have an issue. = Maybe=20 only 2 coils for testing are needed. And larger power \ ground=20 wire.

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Ed=20 Anderson
Sent: Monday, June 11, 2007 8:01 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] MSD type Ignition CD = or not?=20 was Re: Spark Plug Cleaning

Given the interest in getting rid of SAG - its = important=20 that we are all on the same wavelength when discussing components. = For=20 example, there are a whole bunch of different MSD ignition systems out = there -=20 I'm not certain that they are all Capacitive Discharge types. It = may made=20 a difference regarding their ability to avoid/delay on set of SAG. =

At least Lynn's assessment about the rise time = of the CD=20 type driven coils being so fast as not to permit much voltage = leakage via=20 the lead deposits and thereby avoiding SAG seemed to make sense to = me. =20

So the question to Bob Mears is do you recall = whether the=20 MSD system being used was a Capacitive Discharge type? =20 Thanks!

----- Original Message -----
From:=20 bmears9413@aol.com
To: Rotary motors in = aircraft

Sent: Monday, June 11, 2007 = 8:56 AM

Subject: [FlyRotary] Re: Spark = Plug=20 Cleaning

SAG can appear any where apparently. We ran=20 a MSD system on our race care and still ran into = the=20 problem. The problem ended when we switched to alcohol, but=20 thats not a fix for airplanes!

Bob=20 Mears
Supermarine spitfire

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