الفهرس 
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Abstract
The study carried out in Agricultural Engineering Department and Agric.
Botany Department at faculty of Agriculture, kafrelsheikh University.
The main objectives of the study were producing the bioethanol from
potato wastes and usage the bioethanol in SI engine. The experimental
carried out in aerobic batch digester and bioreactor after potato tubers
wastes pretreatment with Bacillus subtilis (E34) as amylolytic bacteria.
The pH of the medium adjusted to 4.5. All experiments incubated at 30
°C under different stirring speeds (30, 120 and 200 rpm). Bio-ethanol
production increased and reached to 70.9 % at 18 hour of duration time
for bioreactor at 200 rpm. The blend fuel E10, E30 and E60 were
prepared and used at three throttle fuel positions. The fuel blend E10 and
E30 gave no significant different compared with the gasoline Octane 80
fuel on the effect of the rotational speed under all treatment conditions. .
On the other hand, the blend fuel E60 gave the low values of sound level
compared to the other blend fuel and Gasoline fuel.