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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2875201@logan.com>
Subject: Re: [FlyRotary] Re: SAG
Date: Mon, 28 Apr 2008 08:55:46 -0400
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Michael, I do not recall whether George Graham used any 100LL or not.  If he 
did not, then he would seldom (if ever) encounter SAG.  I am not an ignition 
expert, but I would think that some of the higher energy/quick risk time 
ignition systems might help the SAG problem - but, I don't really know.  In 
my case, the plugs are cheap enough that I simply replace them.

Why, Yes!   I do have a bushel basket full of spark plugs which I keep 
hoping I will find a way to remove the fouling lead deposits- abrasive 
blasting is not very effective due to the 4 grounding electrodes which tend 
to shield the ceramic cone from the abrasive material.  I keep hoping 
someone with a high power ultrasonic cleaner will see if that might be 
effective - I tried the less powerful (for Jewelry cleaning)  and that did 
not work.

Ed


----- Original Message ----- 
From: "Michael Silvius" <silvius@gwi.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, April 28, 2008 9:38 AM
Subject: [FlyRotary] Re: SAG


> Ed:
>
> I have found his original note to me and in retrospect  I probably read 
> more
> in to George Graham's statements than he intended. I cut and pasted it in
> bellow:
> Michael
> =================================================
> ----- Original Message ----- 
> From: George Graham
> Sent: Saturday, June 02, 2007 5:35 PM
> Subject: Rotary for RANS S--16?
>
>
> An O-235 or 320 is also spec'd for the Long-EZ, which my bird is a
> modification of.  My airplane weighs the same and has about the same power
> as the O-320, more power than the O-235.
>
> I have a 1985 RX-7 13B for power.  I installed it after about 40 hours on 
> a
> ground test stand.  Never did need any parts for the engine, I did replace
> my psru with one of Tracy Crooks. My engine was used when I bought it, no
> rebuild.
>
> I use the stock distributer for spark - never had any SAG.  Have an old
> Dodge truck 2bbl carb, which I modified for mixture control. I do lust 
> after
> a RWS EFI setup, as I am comfortable with electronics, but it flys so 
> nice,
> I leave it alone.
>
> If my engine ever needed any work, I would have to do it, and if it ever
> needs any parts, then I will have to find them, but so far, almost ten
> years, over 500 hours, it has not needed either.
>
> I hope that your luck is as good as mine.
>
> George Graham
> Sarasota Florida
> Mazda RX7 EZ
>
> ===================================================================
> a further exchange bellow:
> ==================================================
>
> Just a confirmation regarding your disribuitor. Yours is infact the old 
> dual
> points distribuitor form the pre 85 engine? the shortie with the low 
> height
> cap?  not the later taller one.
>
> That is what I am planing on doing myself for my Falconar F-12. I have an
> 1988 13B but I have a nice rebuilt 85 points distribuitor.
>
> Mine has no points, so it may be the taller one.  It is the one that came
> with the engine.
>
>
>
> Are you using a coil switcher to isolate the two sets of plugs? or are you
> runing it straight as it was in the car?
>
> I did run two power wires, one for each coil/igniter, with plans to 
> install
> a switch for runup mag check, but I never installed the disable (test)
> switch.  I think that I can tell that both coils are firing by the rpm on
> takeoff, and the color of the plugs are similar.
>
>
> I am curious if there is any way to isolate the two sets of plugs and 
> points
> so as to shut one set off. Dont know if there is any advantage to this 
> other
> than ground test for function as a pre take off check but just curious.
>
> As for carbs, for now I am working on the three 34mm Mikuni carbs set up 
> as
> Tracy did originaly though I am still thinking of how to get a total 
> gravity
> fed system from my nose tank. any ideas?
>
> Yes, a gravity system relies on - well gravity, so the carbs need to be
> below the fuel tank.  Not very likely unless you have a high wing bird, 
> and
> no header tank.  I bought an adjustable pressure regulater, and reduced 
> the
> 3 psi pump ressure to 1 psi for my motorcycle carb setup.
> It worked, but still had a poor mixture adjustment (none other than air
> leaking into the manifold, same as Tracy had)
>
> =====================================
>
> ----- Original Message ----- 
> From: "Ed Anderson" <eanderson@carolina.rr.com>
>
>
>> You are correct, George.  SAG is not really a problem with the ignition
>> system itself.
>>
>
>
>
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