Lighter flywheels

[obi_waynne]

Has anyone fitted a lighter flywheel. What are the downsides apart from a loss of power on hill etc...

Will the engine become more lumpy with one fitted?

 

[HDi fun]

Yes - they do get rougher. I had the DMF on mine replaced with a std item ('cos Peugeot supplied this is a replacement, probably due to too many warranty claims). It's definitely slightly more 4 cylindery now.

 

[obi_waynne]

Did it increase the power output, has economy altered?

 

[HDi fun]

nope - same as far as i can determine

 

[obi_waynne]

Don't suppose you know the weight differences?

 

[HDi fun]

Not sure, all I know is that the DMF is enormous and the clutch is about 14" diameter!!

It's probably quite a chunk of mass because the engine spins up more freely in Neutral than it did with the DMF in place. But the performance is the same. Even to me and I'm quite a sensitive driver

 

[old-git]

Has anyone fitted a lighter flywheel. What are the downsides apart from a loss of power on hill etc...

Will the engine become more lumpy with one fitted?

Circuit racers look for lightness so that engine responds quicker. Drag racers usually go for the heavier option so as to reduce the chances of boging down on the line.

Lumpyness will depend on how much you lighten by, the type and size of engine and your own perspective on what is lumpy. A well tuned and balanced petrol engine should not be lumpy unless you have tried to use an ultralight racing flywheel on your road car! I have no idea with regard to the efect on oil burners. I will leave that to HD.

 

[HDi fun]

straight 4 diesels inherently generate more 2nd order harmonic vibration than a straight petrol. My engine has twin balancer shafts so there's little left to speak of anyway.