G/box: 2WD: Flywheel Dual-mass or Single Mass conversion??

[mario850]

ok i am about to put a new clutch in my S60 2.0t and i am fairly sure the Dual-mass is ok but i am really not a fan of them and i am wondering if there is an off the shelf Solid state/Single mass flywheel available????


or does the likes of an 850/mk1 V70 have a Single mass that would fit???

[owyn]

There is one available from kalmar union, it's not cheap though.

I've never had any bother with the flywheel in mine, the petrols are easier on them than then diesels.

[john f]

personally I would stick to standard spec
I,m sure the DMF was fitted for a reason
and when replaced it will probably outlast the car

John F

[mario850]

Originally Posted by john f

personally I would stick to standard spec
I,m sure the DMF was fitted for a reason
and when replaced it will probably outlast the car

John F

A DMF is fitted to make gear changes smoother for heavy footed people that dont know how to change smoothly and respectfully to the car. SMF are much better and less prone to killing clutches.

[john f]

I,m one of those heavy footed idiots then

John F

[owyn]

Originally Posted by mario850

A DMF is fitted to make gear changes smoother for heavy footed people that dont know how to change smoothly and respectfully to the car. SMF are much better and less prone to killing clutches.

Dmf's are all about smoothing out the high frequency vibrations that are produced in modern engines, especially direct injection models. Racing single mass flywheels are lighter than Dmfs but won't be as smooth.

It's not really got anything to do with gear changes.

[Jim314]

Originally Posted by owyn

Dmf's are all about smoothing out the high frequency vibrations that are produced in modern engines, especially direct injection models. Racing single mass flywheels are lighter than Dmfs but won't be as smooth.

It's not really got anything to do with gear changes.

This is my understanding as well, although I can't claim expert knowledge.

The website of the company which makes the DMFs shows the reduction in vibrations from the time variation in torque even when the engine is running easily at constant speed. This must be especially true with high torque engines, especially diesels known for high torque at low engine speed. So cruising down the motorway the DMF will be smoothing out torsional oscillations.

So the DMF is experiencing wear continually not just during shifting, although the most damaging wear surely must be when high torque is demanded at lower engine speeds, as well when the torque is changing with time (such as during shifting the gears of a manual transmission). This is one reason I question the wisdom of chipping or remapping turbocharged petrol or diesel engines to increase power. This power increase is achieved by increasing torque at a given rpm and must therefore demand more from the DMF.

[mario850]

cheers for the clarification guys.

jim on your info, i full intend to get mine re-mapped and maybe try to squeeze a few extra ponies out of it so hence my reasoning for going Single mass is now even more of an option and better suited for what i want to achieve.

[john f]

My car is a 2007 v70 D5 and when I changed the leaking slave at about 108,000mls I changed the DMF due to the severity of the job, yet the old DMF was still serviceable
I also run a early Porsche 911 C4 that uses a DMF , some people have fitted the RS single flywheel and had all sorts of trouble with the idle , i.e revving the car and when letting off the accelerator the revs drop back quickly due to the lighter flywheel , computor can not keep up and the revs drop to 0 and cut out
Different concept maybee ?
From experience going away from standard spec 90% of the time will cause another niggle

John F

[mario850]

thats why i am asking for info and learning what i can before i do lol.