Fuel Technology -- Low viscosity

[RSBXON at aol.com]

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.

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.   

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.

Fuel                                    Nitro content      Max RPM   Cylinder 
head temp - deg C
Powermaster PowerPac        20% nitro                7800          122 
degrees
Powermaster YS 20/20         20%                        7650          134 
degrees
Brand ZZ                             25-30%                   7600           
149 degrees
Brand ZZ                             20%                        7500          
 134 degrees
Brand XX                             20%                        7500          
 142 degrees

                 
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.    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. 


Anyone else doing research??

Ron Barr
AMA 6507
NSRCA 249



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