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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi guys,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I’m wondering if
you have opinions on my below assumptions. It’s a mail I have sent to DA,
but no answer as of yet. </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Could I be right, should
I rather lengthen or shorten my exhaust system?</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Thanks</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Patrick</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> <font color=navy><span style='color:navy'>============================================================</span></font></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I’m running a DA150 on MTW, short cans TD75K,
Mejzlik 28.5x12</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Started running-in the engine a couple of months ago.
>From day 1, I got 5600 RPM.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Now, 50 liter gas down, no change at all in RPM </span></font><font
size=2 face=Wingdings><span lang=EN-GB style='font-size:10.0pt;font-family:
Wingdings'>L</span></font><font size=2 face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial'> I get exactly the same RPM on
a 32x10 2-blade.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I’m experiencing great difficulty in adjusting
the engine. I don’t seem to be able to get full power, particularly not
in the air. I get the feeling I don’t even get the 5600 in the air.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Tried about anything you can imagine, with adjusting
needles, soldering a little tune on the diaphragm cap, measuring pressure where
it should be done.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Let’s forget about air behaviour, I would
expect significantly higher RPM, even on the ground. Motor is not sagging when
I keep it running full throttle, I baffled the engine, cooling is adequate.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><b><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue;font-weight:bold'>Here’s
what I think is going wrong, I would really like to get your opinion on it.</span></font></b></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>At 5600 RPM, I think I
get some refection of the exhaust system exactly during the intake timing.
If this is so, I just can’t get enough mixture inside the cylinder.
</span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>At low RPM, it’s
always running rich, if I want to improve that, I have to tweak the
“L” as low a 3/8 (instead of the 5/8) . The high needle is not
sensitive at all, it’s like it doesn’t matter where you put it. With
the low, at 3/8, starting a cold engine takes several restarts.</span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>The distance of piston to
the first wall in exhaust systems is about 630mm</span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'> </span></font></p>
<ul type=disc>
<li class=MsoNormal style='color:blue'><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Could I be right? </span></font></li>
<li class=MsoNormal style='color:blue'><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>How much would I
have to lengthen or shorten the exhaust tubing?</span></font></li>
<li class=MsoNormal style='color:blue'><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Secondary questions:</span></font></li>
<ul type=circle>
<li class=MsoNormal style='color:blue'><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>How many degrees is
the intake open, </span></font></li>
<li class=MsoNormal style='color:blue'><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>When does the
intake open: How many degrees from exhaust opening (piston moving down)
till intake port opens?</span></font></li>
</ul>
<li class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'>What RPM should I
expect on the Mejzlik 28.5x12. </span></font></li>
</ul>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Your advise would be highly appreciated!!!</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Patrick</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
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