By having more lubricants that will decrease friction and increase your efficiency
incomplete combustion of fuel
basically, a muffler is used to reduce the sound that the engine produces:)
Sound like you're out of oil.
covering roofs and walls of auditorium with sound absorbing materials like compressed fibre board, rough plasters or draperies
Old-style army jeeps were known for their rough engine operation, often described as "coughing" or "sputtering" and "clattering."
to reduce your sound on a trumpet, use a mute or play with less air
friction is produced on rough surface... so like we use oil and Greece to reduce friction because it disconnet the contact of the object from the rough surface.......
One can either reduce the number of sound producing items. Sound dampening technology can be used to reduce sound such as sound baffling or dampers.
Destructive interferences reduce the pitch of a sound, or silence it all together.
A part of a motor vehicle's exhaust system, serving to muffle the sound of the vehicle.
A part of a motor vehicle's exhaust system, serving to muffle the sound of the vehicle.
Having a harsh, rough, grating voice or sound, as when affected with a cold; making a rough, harsh cry or sound; as, the hoarse raven., Harsh; grating; discordant; -- said of any sound.