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Technical DMF or ordinary flywheel.
It’s usually diesels that have a DMF
It is a DMF that is fitted, same as on the 2.0MJet engine. (non DCT).
Fiat P/N:55250895 (I got this P/N directly from Fiat ePER and my chassis number info)
Same as a LUK - https://www.buycarparts.co.uk/fiat/500x/108300/10157/flywheel
DMFs are now the standard on many modern cars. They reduce rotational and inertia which improves pick-up, acceleration and fuel consumption.
It used to be the case that people replaced DMFs with traditional ones but I'm reliably informed that more modern engine designs DO NOT like to run correctly and smoothly in the absence of a DMF.
If is also true that DMF design and reliability has substantially improved since the early days so there is no real need to consider replacing a modern DMF with a traditional flywheel.
Fiat P/N:55250895 (I got this P/N directly from Fiat ePER and my chassis number info)
Same as a LUK - https://www.buycarparts.co.uk/fiat/500x/108300/10157/flywheel
DMFs are now the standard on many modern cars. They reduce rotational and inertia which improves pick-up, acceleration and fuel consumption.
It used to be the case that people replaced DMFs with traditional ones but I'm reliably informed that more modern engine designs DO NOT like to run correctly and smoothly in the absence of a DMF.
If is also true that DMF design and reliability has substantially improved since the early days so there is no real need to consider replacing a modern DMF with a traditional flywheel.
Although this was on a diesel. Mr clutch mechanic told me recently that people often ask for a single flywheel conversion if there’s is worn out because it’s a bit cheaper but they always refuse to do it as they say a car with a DMF will drive like a transit van with a single one.
TrevC
Established member
Apparently fitting a plain flywheel instead of a DMF can also put stresses on the drivetrain that it wasn't designed for.
I believe this is also true. With the less mass of a DMF compared to a traditional lump of metal the stored energy is less. This means that bad gear changes and dropped clutches push less stored energy through the system. With this in mind and manufacturers driving for ever lower mass of vehicles and improved efficiency then with a DMF they are able to reduce the size of drive shafts, CV joints, gear cogs etc.
TrevC
Established member
Indeed. But I think they were also brought in to absorb the powerful torque pulses from modern turbocharged petrol engines, especially when they are 3-cyl. I didn't know my 500x had one, no idea if the Hyundai that replaced it also has one, but as it's a 1.4 turbo it's likely. Pretty sure my wife's 1.2 500c won't have one though.
It was also done to reduce vibration from the engine in to other parts of the car to reduce engine and road noise.
Ford have been fitting them to petrol engines since the early 2000’s it’s not just about torque, when fiat started fitting them as early adopters, it significantly cut cabin noise.
Ford have been fitting them to petrol engines since the early 2000’s it’s not just about torque, when fiat started fitting them as early adopters, it significantly cut cabin noise.
