DMF or SMF?

[Xenophon]

Also, DMF, DRL, DPF - these are not acronyms.

Thank you. But this is a losing battle, because most of the English-speaking world is happier with ignorance than with accuracy.

I too dislike DMFs, mostly because of their tendency to go expensively wrong later in life. Maybe someone will invent a DMF which lasts as long as the vehicle.

[My_Yeti]

Just got a reply from Skoda Customer Service, my 1.2 is fitted with a DMF.

Not sure why the difference between the Golf and the Yeti?

[My_Yeti]

Just had a phone call from a follow up question that I asked from Skoda. I am impressed by the turn of speed of the call.

Bascially, but can't confirm without chassis number, it is likely that the lower output 1.2 TSI (fitted to Golf, Fabia and Roomster) feature a single mass flywheel, but the higher output version (105's) are fitted with dual mass flywheel.

[telecaster]

Please excuse my ignorance, but can one of you gentlemen

explain the technical difference between DMF and SMF?

Why is one better (or worse) than the other?

I really do not understand the difference

cheers

otto

[Agerbundsen]

Please excuse my ignorance, but can one of you gentlemen

explain the technical difference between DMF and SMF?

Why is one better (or worse) than the other?

I really do not understand the difference

cheers

otto

It flattens out torsional vibrations from direct injected engines - primarily Diesels.

Try this and be patioent - graph at the end.

[telecaster]

It flattens out torsional vibrations from direct injected engines - primarily Diesels.

thanks!!!!

cheers

otto

[My_Yeti]

This might be useful.

http://www.honestjohn.co.uk/faq/dual-mass-flywheels/

[Agerbundsen]

Since the discussion of Dual Mass Flywheels and how it relates to engines, I asked our local dealer if the DMF on the 140 and 170 HP engines were the same. As it happens, they are not - two different part numbers.

It would make sense that the higher torque 170 HP would also have higher torsional vibrations, requiring a differently tuned DMF. There is not likely any real cost implications in manufacture, as springs with different stiffnes are not very different , costwise.

It does point to the thought that re-mappping any of the Yeti engines ouught to bring out the question whether the re-mapping should include a different set of springs for thE DMF???

[telecaster]

hmmm........

Thinking about it you are probably right, but is it a real problem

out on the roads? My Saab93 was tuned from 150 to 180 HP, my LandRover

Defender from 122 to ca 160 HP, could not detect any more vibrations

or more noise or strange behavior from those engines at all.

Just pure joy of driving and lesser diesel costs :-)

Anyway its a point to think about, is the 140 HP really a fully tuned

100 HP engine, so we are close to the limit already, while the 170HP is

a very different engine with a lot of stronger components?

Never been thinking about this before, thanks for interesting views.

cheers

otto

[Agerbundsen]

Hi Otto,

Maybe neither the SAAB or the LR had DMF, so it would have no effect on that.

I guess my point was this: Many complaints of the DMF may have come from enthusiasts with re-mapped or otherwise breathed on engines. If someone does decide to re-map, one should be aware that there can be a potential durability problem with the DMF.

Re-mapping is fairly cheap. Tearing the engine down to replace the flywheel at the same time is very expensive.

Even with the crazy vehicle taxes here in DK (like in Norway) I went for the 170 and paid the price. I got the power I wanted, and presume the components that needed to handle it were included. Certainly the brakes are.

[telecaster]

I see your point and its not difficult to agree with you either :yes:

To me the most important point was the DSG box, then power........

That said I still follow with great interest the tuning brigade here

on the Yeti forum, and I am looking foreward to reports on how the

upgraded 140HP engines with DSGbox work as the number of km´s or miles

grows.

And yes, the taxes on HP is wild here in Scandinavia :'(

[Shaunieboy]

See here for more info on this SMF / DMF discussion:

 

Hopefully this will help some folks out.