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Old 04-25-2010, 12:31 PM   #10 (permalink)
Master EcoModder
Join Date: Apr 2010
Location: belgium, wi
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Bus - '94 Ford School Bus huge

Stupid - '01 Chevy Blazer LS
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Originally Posted by dremd View Post
Welcome to ecomodder!

If that were true manufactures would just install single mass wheels, mainly due to cost, but complexity, and failure rate would come it to play as well.
Not quite sure what you mean with the failure rate but...the benefits that you are looking for, mpg, would be present in both a smf and dmf that weigh in at 25-30lbs. The difference for the dmf is that it absorbs shock like a crankshaft balancer. Balancers are dual mass as well, and absorb crankshaft speed variations as well as vibrations. That is the primary benefit of the DMF. They just always seem to be heavier, which leads to fuel efficiency.

As for manufacturers, they surely don't install the dmf for fuel efficiency. It is for the smoother drivetrain benefits. If manufacturers based everything they did on fuel mileage, there wouldn't be forums like this
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