From: "Steven W. Boese" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Tuning
Thread-Topic: [FlyRotary] Re: Tuning
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Date: Thu, 7 Jan 2016 18:05:30 +0000
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When using stock spark plugs, I would get 15 to 20 hours of use before enco=
untering SAG.  With BR10 EIX spark plugs in both leading and trailing locat=
ions, I did not have any problems for 180 hours.  I don't know how long the=
y would have gone since they were changed simply due to the gap widening as=
 the electrodes became worn.  They were still working fine when removed.  N=
o leaded fuel was used.


Steve Boese
RV6A, 1986 13B NA, RD1A, EC2


________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of =
Lehanover <flyrotary@lancaironline.net>
Sent: Tuesday, January 5, 2016 10:22 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Tuning

Try this:

Gap the plugs down to .010". I used a MSD-6A on both leading and trailing. =
No misses up to 9,600 RPM.

For 100% duty cycle 11.5 is the heat range you want. 9s and 10s are too hot=
. There is an Autolite plug

about the 10 heat range but I am in Florida and all of my data in Hebron Oh=
io. The NGK 11.5 plugs are $25.00 each and are retracted tip side electrode=
. Can be gapped and are ice cold. A 12.7 mixture should get you 1575 to 160=
0 EGTs. Once on top, lean to stumble of slight sag then back rich a bit for=
 economy, or lean to best RPM for best power. Best timing is 25 to 27 degre=
es BTDC for higher octanes. Lower octane fuel works better than higher octa=
ne fuel. In that case 22 to 24 degrees. The rotary needs little advance as =
there is a long dwell near TDC. The timing marks on the crank are moving 3 =
times faster than the rotor. IE 30 degrees on the pulley is 10 degrees at t=
he rotor.

The timing marks can be added to the front pulley or to the flywheel teeth.=
 Often the flywheel is better. Divide the flywheel tooth count by 360 to ge=
t the degrees per tooth. Find TDC. Mark a flexplate (or flywheel) tooth nex=
t to your new rigid pointer with red paint (for TDC). Then turn the engine =
backwards the correct number of teeth to find the advance number you want t=
o run. Mark that tooth or valley between teeth with white paint  right next=
 to your pointer. No curve, advance weights or vacuum anything is required =
as the engine will start and idle at full advance. Now you can set your tim=
ing dead on and it is easy to see and check from time to time. No tuning is=
 possible without the correct timing to begin with.

Both leading and trailing may be fired at once. The split timing is mostly =
for pollution control. It has very little affect at speed.

Lynn E. Hanover


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<html>
<head>
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1">
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</head>
<body dir=3D"ltr">
<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;back=
ground-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;">
<p>When using stock spark plugs, I would get 15 to 20 hours of use before e=
ncountering SAG.&nbsp; With BR10 EIX spark plugs in both leading and traili=
ng locations, I did not have any problems for 180 hours.&nbsp; I don't know=
 how long they would have gone since they
 were changed simply due to the gap widening as the electrodes became worn.=
&nbsp; They were still working fine when removed.&nbsp; No leaded fuel was =
used.&nbsp;
<br>
</p>
<p><br>
</p>
<div id=3D"Signature">
<div><font face=3D"Tahoma" size=3D"2">
<div><font face=3D"tahoma" size=3D"2">Steve Boese</font></div>
<div><font face=3D"tahoma" size=3D"2">RV6A, 1986 13B NA, RD1A, EC2</font></=
div>
</font></div>
</div>
<br>
<br>
<div style=3D"color: rgb(0, 0, 0);">
<hr tabindex=3D"-1" style=3D"width: 98%; display: inline-block;">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font color=3D"#000000" face=3D"Calib=
ri, sans-serif" style=3D"font-size: 11pt;"><b>From:</b> Rotary motors in ai=
rcraft &lt;flyrotary@lancaironline.net&gt; on behalf of Lehanover &lt;flyro=
tary@lancaironline.net&gt;<br>
<b>Sent:</b> Tuesday, January 5, 2016 10:22 PM<br>
<b>To:</b> Rotary motors in aircraft<br>
<b>Subject:</b> [FlyRotary] Re: Tuning</font>
<div>&nbsp;</div>
</div>
<div><font id=3D"role_document" color=3D"#000000" face=3D"Arial" size=3D"2"=
>
<div>Try this:</div>
<div>&nbsp;</div>
<div>Gap the plugs down to .010&quot;. I used a MSD-6A on both leading and =
trailing. No misses up to 9,600 RPM.</div>
<div>&nbsp;</div>
<div>For 100% duty cycle 11.5 is the heat range you want. 9s and 10s are to=
o hot. There is an Autolite plug
</div>
<div>&nbsp;</div>
<div>about the 10 heat range but I am in Florida and all of my data in&nbsp=
;Hebron Ohio. The NGK 11.5 plugs are $25.00 each and are retracted tip side=
 electrode. Can be gapped and are ice cold. A 12.7 mixture should get you 1=
575 to 1600 EGTs. Once on top, lean to
 stumble of slight sag then back rich a bit for economy, or lean to best RP=
M for best power.&nbsp;Best timing is 25 to 27 degrees BTDC for higher octa=
nes. Lower octane fuel works better than higher octane fuel. In that case 2=
2 to 24 degrees. The rotary needs little
 advance as there is a long dwell near TDC. The timing marks on the crank a=
re moving 3 times faster than the rotor. IE 30 degrees on the pulley is 10 =
degrees at the rotor.</div>
<div>&nbsp;</div>
<div>The timing marks can be added to the front pulley or to the flywheel t=
eeth. Often the flywheel is better. Divide the flywheel tooth count by 360 =
to get the degrees per tooth. Find TDC. Mark a flexplate (or flywheel) toot=
h&nbsp;next to your new rigid pointer
 with red paint (for TDC). Then turn the engine backwards the correct numbe=
r of teeth to find the advance number you want to run. Mark that tooth or v=
alley between teeth with white paint&nbsp; right next to your pointer.&nbsp=
;No curve, advance weights or vacuum anything
 is required&nbsp;as the engine will start and idle at full advance. Now yo=
u can set your timing dead on and it is easy to see and check from time to =
time. No tuning is possible without the correct timing to begin with.</div>
<div>&nbsp;</div>
<div>Both leading and trailing may be fired at once. The split timing is mo=
stly for pollution control. It has very little affect at speed.
</div>
<div>&nbsp;</div>
<div>Lynn E. Hanover</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;</div>
</font></div>
</div>
</div>
</body>
</html>

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