View Single Post
Old 03-07-2010, 06:29 PM   #8 (permalink)
bestclimb
Smeghead
 
Join Date: Oct 2009
Location: South Central AK
Posts: 933

escort - '99 ford escort sport
90 day: 42.38 mpg (US)

scoobaru - '02 Subaru Forester s
90 day: 28.65 mpg (US)
Thanks: 32
Thanked 146 Times in 97 Posts
Once the mass is spinning it takes very little energy to keep it spinning regardless of weight. The lighter pulley will let the engine spin up faster and down faster than heavy ones. The total rotating mass in the engine is quite large compared to the weight saved with these pulleys. My guess is the only time you would notice them is when you opened the hood.
__________________

Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways.

One mile of road will take you one mile, one mile of runway can take you around the world.
  Reply With Quote