Free images results:
 

Engine pictures, stock photos and images

 
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Old engine Royalty Free Stock Images
Author: Garlic
Hotrod Royalty Free Stock Image
Author: Klikk
Train Stock Photography
Author: Andyb1126
Hot Rod Stock Images
Author: Rodehi
Jet fighter Royalty Free Stock Photos
Author: Euler
Car_10 Stock Images
Author: Clv69
No3 Stock Photography
No3
Author: Falcon stock
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Bus engine Stock Photo
Author: Goce
Engine Stock Photography
Author: Gudella