A few more thicknesses of flannel will muffle the noise of the motor.
Advanced English Dictionary
+verb[VN] 1 to make a sound quieter or less clear: He tried to muffle the alarm clock by putting it under his pillow. 2 ~ sb/sth (up) (in sth) to wrap or cover sb/sth in order to keep them/it warm: She muffled the child up in a blanket.
Random quote: We don't stop playing because we grow old; we grow old because we stop playing.: Bernard Shaw