This study examined consumer and professional grade handheld engines. Twenty-four consumer grade 50 hour Emissions Determination Period (EDP) trimmers and 24 professional grade 300 hour EDP backpack leaf blowers were run on four different ethanol fuel concentrations; E0, E10, E15, and E20. Six engines of each type were run on each of the fuel blends through their full EDP.

All engines were broken-in and adjusted to manufacturer specifications on E0. Then engines were emissions tested on E0 to provide a baseline and to determine the rich to lean order of the engines. Next, the leanest operating engine received E20 and the richest operating engine received E0 to simulate a worst-case scenario in the field. The engines’ emissions, performance, temperatures, and wear were measured during the study to see if E15 or E20 would cause any other issues than E0 or E10 which the engines are design to consume. Measurements were taken at the beginning of the study along with half way through the EDP and at the end of the EDP.


Gary Mead

Committee Member

Bruce Jones

Committee Member

Kuldeep Agrawal

Date of Degree




Document Type



Master of Science (MS)


Automotive and Manufacturing Engineering Technology


Science, Engineering and Technology


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In Copyright