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Originally Posted by Jorge89
I have a 1994 civic ex 4dr with a d16 engine in it. I was wondering if putting lightweight parts would make a noticeable difference in mileage. I was thinking about a lightweight gear cam and a lightweight flywheel. I've read that lightweight crank pulleys can be bad since they vibrate too much so I don't think I'll change that one.
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My guess is you will never have enough fuel savings to recoup the cost of the lighter parts, but some of the value is in the fun of having better performance.
I've heard concerns about vibration damage from lightweight crank pulleys too, but I would think the tension of the belt on the pulley would either dampen the vibration, or the vibration would be negligible to begin with.
I put a lightweight under-drive pulley set on my TSX as an experiment and for fun, with no expectation of recouping the cost. If it gave me better fuel economy, my guess is it's in the 1% range, which is far too low to see amongst normal fluctuations.
You might look into lightweight wheels for your car. If you buy 'em used you should be able to recoup the cost when you go to sell the car. Performance enthusiasts often say that lighter wheels can be the best bang for your buck when it comes to handling and acceleration mods.