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From: "Michael Silvius" <silvius@gwi.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2875189@logan.com>
Subject: Re: [FlyRotary] SAG
Date: Mon, 28 Apr 2008 08:38:47 -0500
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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.
>