Mpg Gains with Underdrive Crank Pulley? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 5 (permalink) Old 03-24-2010, 07:51 PM Thread Starter
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Mpg Gains with Underdrive Crank Pulley?

I know an aluminum underdrive crank pulley will be lighter weight then stock, 1.3 lb vs 3.6 lb and the smaller size will help reduce accessory drag.

I know this will not only free up some hp but also give you mpg gains as well.

Given that at 50 mph I get about 50 mpg would you guess are we talking a miniscule mpg increase of 0.5 - 1.0 mpg or something more around 1.5 - 2.5 mpg gained?

Here is the part...
5 ribs - Ecotec Underdrive Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - NA Ecotec UDP - Car Performance Parts And Auto Accessories | MRZ Performance

I know I'm talking several years before breaking even but was just curious.

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post #2 of 5 (permalink) Old 03-24-2010, 07:54 PM
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its possible but is it worth it?



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post #3 of 5 (permalink) Old 03-24-2010, 08:12 PM Thread Starter
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Unless I have an unfortunate accident with my balt I'm more inclined to replace the engine if it dies then simply dispose of the car and buy a new one when it hits 150k miles.

That possibly being the case I would end up driving this car for a great many years and it probably would pay off.

I'm also a little obsessed with efficiency.

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post #4 of 5 (permalink) Old 03-25-2010, 06:30 AM
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put stuff under the car so the underside is one smooth piece



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post #5 of 5 (permalink) Old 03-25-2010, 07:04 AM
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I'm also a little obsessed with efficiency.
This is the best reason to do it. Who cares if it pays for it's self or not. If FE is your hobby you should pursue it just like anyone would pursue any other hobby.

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