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<DIV><FONT face=Arial size=2>Thanks for confirming my suspicions!</FONT></DIV>
<DIV><FONT face=Arial size=2>The only dual ignition engines that I am aware of
are those in highly critical applications, full scale airplanes and emergency
services. My personal experience with full scale has been that the second spark
plug only makes the troubleshooting more difficult. I believe the whole idea of
redundant ignition is a concept whose time has past. There are twice as many
things to fail. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I knew a fellow who was preparing a van for his
handicapped son. The law at the time required dual, isolated batteries. The
mechanics acknowledged that the isolation electronics were the least reliable
part of the van. That was many years back, I hope it is better now.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>John Ferrell <BR><A
href="http://DixieNC.US">http://DixieNC.US</A><BR></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=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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