<HTML><FONT FACE=arial,helvetica><FONT SIZE=2>I have been doing some research on new fuel technology and have been looking for a fuel to run in the my OS 140 EFI . Key objectives were to eliminate bearing corrosion, lowering the operating temperature and increasing main bearing life.<BR>
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As it turns out, some manufacturers have been developing new fuels for both the YS 4 stroke and OS two stroke engines with corrosion inhibitors and a new low viscosity fuel that appears to meet of the objectives I have been working toward. I aquired some of various fuel types to test out in the OS 140 Electronic Fuel Injection engine (onboard computer and sensors that track both RPM - instantaneous and maximum, and Cylinder head temperature - instantaneous and maximum). These onboard sensors make the engine a good candidate to test new fuels. <BR>
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The table below shows the results for the full throttle sustained RPM and the cylinder head temperature on a consistent fuel injector setting. The engine is propped with a 17/12 APC wide blade which is a relatively high load and is fully cowled in a PL products Smaragd airframe. The day I did the test, the temperature was 93 degrees F and high humidity.<BR>
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<B><U>Fuel </U> </B><U>Nitro content</U> <U>Max RPM</U> <U>Cylinder head temp - deg C</U><BR>
Powermaster PowerPac 20% nitro 7800 122 degrees<BR>
Powermaster YS 20/20 20% 7650 134 degrees<BR>
Brand ZZ 25-30% 7600 149 degrees<BR>
Brand ZZ 20% 7500 134 degrees<BR>
Brand XX 20% 7500 142 degrees<BR>
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One fuel gave more RPM and the lowest cylinder head temperature. This means that the engine was producing more horsepower and the engine actually ran cooler. </FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><B><I> </FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"></B></I>I understand that YS engines may be recommending this new fuel for the YS DZ fuel injected engine in a 30% nitro blend. Also some of the helicopter guys are running the fuel in very high stress environments. <BR>
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Anyone else doing research??<BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=4 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><B>Ron Barr<BR>
AMA 6507<BR>
NSRCA 249<BR>
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