Just been reading an article in the IMI magazine about DMF’s and thought i would share some of it with you.
BMW were the first to fit dual mass flywheels in 1985, to the525 in a bid to reduce vibration and noise. Since then 63 million DMF’s have been produced worldwide and LUK currently manufacture over 25,000 units a day in its factory in Germany, it has others in Korea, China and Hungary. LUK say that as for reliability, a DMF is designed to last a vehicles lifetime, up to 155,000 miles and also say that adverse reports are either down to wrong diagnosis or driver abuse. The technical director of LUK goes on to say, that DMF’s are susceptible to engine misfire, making them work a lot harder and causing rattles, so a workshop may replace a DMF without fixing the engine misfire. He also states that poor battery voltage could also affect performance (i assume he means whilst starting) along with what he said were two common habits, overloading the vehicle and starting while in gear, although this was more aimed at van drivers.
So how did the concept of a DMF come about? DMF development was driven by the arrival of high torque diesel engines, which generated more noise and vibration, a potential problem compounded by the current trend towards smaller engines and the use of aluminium for the crankcase and gearbox housing. Though lighter than cast iron, aluminium has poorer acoustics, causing transmission rattle when used with a solid flywheel.
The article also states that the DMF gives better fuel economy over a solid flywheel and as i understand it, there are over 25 moving parts that make up a typical DMF.
Do you think maybe these people do actually sit in ivory towers and put out this stuff? Seems its not the DMF, it’s either us or or cars that are the problem, LMAO!!!!!!