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<DIV><FONT size=2>Eric,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I agree with you that dual plugs are not necessary. If
you can't set up your engine</FONT></DIV>
<DIV><FONT size=2>to run right on a single plug, a second one does not cure that
problem.</FONT></DIV>
<DIV><FONT size=2>In my case I did it more for convinience. When starting an
inverted engine for the first</FONT></DIV>
<DIV><FONT size=2>flight of the day, I always remove the center plug and turn
the engine over about 8-10</FONT></DIV>
<DIV><FONT size=2>revolutions with the electric starter to drain the accumulated
oil. The rear plug has</FONT></DIV>
<DIV><FONT size=2>the remote glow attachment. This saves me detaching and
reattaching the connector</FONT></DIV>
<DIV><FONT size=2>for the remote. Using "F" plugs in both locations and all
inverted 2 stroke </FONT><FONT size=2>pattern </FONT></DIV>
<DIV><FONT size=2>engines.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Karl G. Mueller<BR><A
href="mailto:kgamueller@rogers.com">kgamueller@rogers.com</A><BR></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=pattern4u@comcast.net href="mailto:pattern4u@comcast.net">Grow
Pattern</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, April 20, 2005 7:07
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Two plugs - Neccessary?</DIV>
<DIV><BR></DIV>
<DIV>
<DIV>I made a dual plug head for the OS 1.40 and for the 1.60. I
also ran two Mintor 1.60's.</DIV>
<DIV> </DIV>
<DIV>I know before I type what follows I may well draw some fire, but
after two years of using twin-plug-heads on different motors<STRONG> <EM>I am
personally convinced that they are a total waste of money and
time.</EM></STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV>If you are using a twin plug head to fix a "problem" there is probably a
better fix!. </DIV>
<DIV> </DIV>
<DIV>I went through over 60 plugs of all types. I still have a can-full
of them in my van. Constantly, I saw the lower or rear plug fail, It always
ran better with the center plug working but you had to reset the carb. One
argument is the engine keeps going if you lose a plug. The reality that I
experienced is that there was a big loss of power and often overheating when
one plug went out. Twin plugs change the ignition timing of the engine.
Two plugs of the same type, A-3 "F"etc. or mixing rated plugs all
interfere with the timing and design of the motors combustion.</DIV>
<DIV> </DIV>
<DIV>Of course there are a whole bunch of folks that are happy with two
plugs and are convinced that they are the way to go. I say enjoy and I'm
glad for you, really!</DIV>
<DIV> </DIV>
<DIV>My 1.40's, and I say mine whether I still own them or not, run like
watches on one plug. My OS 1.60's run great on one plug. The FI or Mix-carb
versions, it makes no difference, if you set the carb correctly and use
the right volume of pipe, they run great. I literally gave up
on my 1.60 Mintors, especially after I was informed by the supplier
that I did not know what I was doing with 2-cycles! I
acknowledge they could well have been right, but there was no available
information to fill the vacuum of why and what was the reason that
they did not work. (Ironically enough the factory agreed basically with
my findings and changed the guts of the product) The upgraded piston and liner
ran better but they still kept killing plugs at a much higher rate than a
single plug set-up. </DIV>
<DIV> </DIV>
<DIV>But I digress. The twin plug does give a lower idle and does help through
transition on a tuned pipe. However if your engine will not run at an
acceptable idle on one plug something else is amiss. For example. wrong plug,
wrong fuel, idle mixture is off, bad bearings, tight ring/liner etc. Similarly
on transition problems. I have noticed that quite a few so called tuned pipes
do not have much of a tapered cone to the main body of the pipe. Mix
carbs and double plugs might get you through these issues, It's your
choice.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV> </DIV>
<DIV>Eric.</DIV></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=rodney19821982@yahoo.com
href="mailto:rodney19821982@yahoo.com">Rodney Tanner</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, April 20, 2005 2:48
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [SPAM] Re: RE: OS mixture
question</DIV>
<DIV><BR></DIV>
<DIV>Hi Ron,</DIV>
<DIV> </DIV>
<DIV>Eric H, or Dean P would probably be the best people
to answer that.</DIV>
<DIV> </DIV>
<DIV>I forget how many variables back I changed to the 3M heads. My basic
take would be that they give a smoother mid range on an ESD pipe,
are less sensitive to pipe setting, lower the compression - so run cooler,
without affecting the top end performance. </DIV>
<DIV> </DIV>
<DIV>Rodney</DIV>
<DIV> </DIV>
<DIV><BR><B><I>Ron Van Putte <vanputte@cox.net></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"><BR>On
Apr 20, 2005, at 8:11 AM, Cameron Smith wrote:<BR><BR>> Are you
supposed to change em? Seriously I change both plugs about <BR>> every
3 to 5 cases of fuel. Sometimes I just rotate the center plug to <BR>>
the back position then replace the center plug. I replace ANYtime the
<BR>> engine deadsticks or acts to much out of character. Most times
they <BR>> are still good.<BR>> A buddy checked my idle the
other day on my NEW Single plug (STOCK) <BR>> head & it also Idles
at 1K. Gotta luv it!<BR><BR>I've got to ask this: Is there any real
difference in the way an OS <BR>1.40RX runs with the Mintor 1.40 head
'extra' plug in the 'front' or <BR>'rear' position? I know that Lance says
to run it with the 'extra' <BR>plug in the 'rear' position, but I
theorized that there would be better <BR>fuel ignition if the 'extra' plug
was in the 'front' position, as far <BR>away from the exhaust as possible.
I've been running mine that way and <BR>the engine runs fine.<BR><BR>Ron
Van Putte<BR>> <BR>>
<BR>>
<BR>> -----Original Message-----<BR>> From:
discussion-request@nsrca.org <BR>>
[mailto:discussion-request@nsrca.org] On Behalf Of <BR>>
Jim_Woodward@beaerospace.com<BR>> Sent: Wednesday, April 20, 2005 8:57
AM<BR>> To: discussion@nsrca.org<BR>> Cc: discussion@nsrca.org;
discussion-request@nsrca.org<BR>> Subject: Re: [SPAM] Re: RE: OS
mixture question<BR>> <BR>><BR>><BR>> Hi
Rodney,<BR>><BR>> Why are you changing plugs every 30 flights?
That get pretty <BR>> expensive in the long run. Is the
engine running lean? I've seen a <BR>> few other using the 3M
head and OSF plugs, and not having to change so <BR>>
often.<BR>><BR>> Cameron, how often are you changing
plugs?<BR>><BR>> Thanks,<BR>> Jim W.<BR></BLOCKQUOTE>
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