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Date: Mon, 11 Jun 2007 11:59:33 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: MSD type Ignition CD or not?   was  Re: Spark
 Plug Cleaning
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Ed,

Can you tell by looking at a plug if it's probably a SAG plug?  Is
there any way of testing the plugs without flying them?  If there were
some way to tell if that was the problem I experienced I would like to
find out. I've squirted oil in the chambers to protect the engine while
it's sitting around so that might complicate inspection.

I bought a CD system for my 1952 Ford back in the early '60's.
Unfortunately the '52 Ford was positive ground and the CD system was not
so it didn't work at all.  I then tried to build one from plans in a
book using the stock coil.  I never got it to work very well and gave
up on the project.  

Bob W.

On Mon, 11 Jun 2007 11:39:29 -0400
"Ed Anderson" <eanderson@carolina.rr.com> wrote:

> Ok, Bob, I thought perhaps different MSD systems for different automobiles, 
> seems I used to recall they had a series for regular automobiles that didn't 
> use Capacitor Discharge, but my memory being what it isn't.
> 
> Thanks
> 
> Ed
> ----- Original Message ----- 
> From: "Bob White" <rlwhite@comcast.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Monday, June 11, 2007 10:27 AM
> Subject: [FlyRotary] Re: MSD type Ignition CD or not? was Re: Spark Plug 
> Cleaning
> 
> 
> > Hi Ed,
> >
> > All of the regular MSD systems are CD's.  I sort of wonder if the
> > Blaster coils are or not, and if they are do they have the same energy
> > levels of the other MSD systems.  I think I've seen that the multiple
> > spark feature goes away at higher RPM's because of time constraints.
> >
> > Bob W.
> >
> >
> > On Mon, 11 Jun 2007 10:01:01 -0400
> > "Ed Anderson" <eanderson@carolina.rr.com> wrote:
> >
> >> Given the interest in getting rid of SAG - its important that we are all 
> >> on the same wavelength when discussing components.  For example, there 
> >> are a whole bunch of different MSD ignition systems out there - I'm not 
> >> certain that they are all Capacitive Discharge types.  It may made a 
> >> difference regarding their ability to avoid/delay on set of SAG.
> >>
> >> At least Lynn's assessment about the rise time of the CD type driven 
> >> coils being so fast as not to permit much voltage  leakage via the lead 
> >> deposits and thereby avoiding SAG seemed to make sense to me.
> >>
> >> So the question to Bob Mears is do you recall whether the MSD system 
> >> being used was a Capacitive Discharge type?  Thanks!
> >>
> >> Ed
> >>   ----- Original Message ----- 
> >>   From: bmears9413@aol.com
> >>   To: Rotary motors in aircraft
> >>   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!
> >>
> >>   Bob Mears
> >>   Supermarine spitfire
> >>
> >>
> >>
> >>
> >
> >
> > -- 
> > N93BD - Rotary Powered BD-4 - http://www.bob-white.com
> > 3.8 Hours Total Time and holding
> > Cables for your rotary installation - http://www.roblinphoto.com/shop/
> >
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub: 
> > http://mail.lancaironline.net:81/lists/flyrotary/List.html 
> 
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html


-- 
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://www.roblinphoto.com/shop/