I know im asking a very limited audience here, but ive had my sachs/ loba stage 2 clutch and flywheel for a few months now. The pedal feels great, the gear change is fine and smooth, it engages fine isn't too far off oem in that respect. But its extremely noisy on over run. If I let the throttle off at any revs it sounds like there's nuts n bolts going around inside my engine. It's not too bad at low revs and most people dont notice it when im driving normally, pick up the pace however and let off at high revs in say 2nd or 3rd gear and its loud. Does anybody else have similar experience with an smf? There's no rattle at idle and no noise on acceleration, just on overrun.
Help from those with single mass flywheel
- Thread starter calvR
- Start date
I've never owned a car with a smf fitted but drove a few.
As Al says about normal I'd say!
I've never been a lover of smf due to the extra stress on the crankshaft.
As Al says about normal I'd say!
I've never been a lover of smf due to the extra stress on the crankshaft.
My SMF is noisy as hell and I hate it. Wish I'd never bothered with it but I killed two DMF's so don't know what to do!
Can someone simplify the difference between a single and a dual for me please?
And what's the pros and cons of each?
(I'm sure this will benefit a few people actually
)
And what's the pros and cons of each?
(I'm sure this will benefit a few people actually
)So it sounds like its normal then so that's good. I must admit the only noise I was aware of wen I decided to go with smf was the rattling everybody seems to mention. Nobody really said anything about the sound resembling a chainsaw on overrun.
I'm ok with the noise as its not actually a problem on the daily drive, my wife never mentions it and she drives it everyday to work. It just sounds awful when slowing for corners when on track or fast road driving. I always rev match on downshifts and heel and toe so hopefully the crank and gearbox won't get too much stress, although obviously more than a dmf I realise
I'm ok with the noise as its not actually a problem on the daily drive, my wife never mentions it and she drives it everyday to work. It just sounds awful when slowing for corners when on track or fast road driving. I always rev match on downshifts and heel and toe so hopefully the crank and gearbox won't get too much stress, although obviously more than a dmf I realise
Mines never bothered me - only really notice slightly more vibration up to ~1750rpm. Can't say I have ever noticed it on run off (too much engine and road noise?!)
Can someone simplify the difference between a single and a dual for me please?
And what's the pros and cons of each?
(I'm sure this will benefit a few people actually
Well basically a dual mass is 2 separate plates with springs in between them. The springs have a damping effect between the engine and gearbox so it smooths out noise, vibration and harshness (NVH). The problem is the springs wear out causing excess movement between the 2 plates, in the worst case they can fail completely causing a lot of damage.
A single mass is a solid plate so a lot lighter but all the nvh is transmitted straight through the gearbox and into your arse and ears
They can handle the torque a lot better than a dual mass and u get instant clutch engagement as there is effectively no slack in the drivetrain. They dont wear out like dual mass as there is nothing to wear.
The big problem is that due to the lack of damping effect they are noisy and the vibration from the engine is transmitted straight through the gearbox and back through the crank. This could cause problems later on although I think the way you drive will have a big effect on this. If you slam your shifts home and dump the clutch up it will bang right through the car, so some mechanical sympathy is definitely required.
My loba is just under 5 kgs lighter than the oem dmf. I thought all smfs would be lighter anyway?
Well basically a dual mass is 2 separate plates with springs in between them. The springs have a damping effect between the engine and gearbox so it smooths out noise, vibration and harshness (NVH). The problem is the springs wear out causing excess movement between the 2 plates, in the worst case they can fail completely causing a lot of damage.
A single mass is a solid plate so a lot lighter but all the nvh is transmitted straight through the gearbox and into your arse and ears
They can handle the torque a lot better than a dual mass and u get instant clutch engagement as there is effectively no slack in the drivetrain. They dont wear out like dual mass as there is nothing to wear.
The big problem is that due to the lack of damping effect they are noisy and the vibration from the engine is transmitted straight through the gearbox and back through the crank. This could cause problems later on although I think the way you drive will have a big effect on this. If you slam your shifts home and dump the clutch up it will bang right through the car, so some mechanical sympathy is definitely required.
Perfectly explained calv, thank you!! So I'm guessing the springs on a dmf aren't exactly a serviceable part then? And what sort of problems would all the nvh going through the crank cause with the smf?
Always strughled to grasp all the ins and outs of a clutch
It's all about the Loba flywheel...sounds like a tractor! but it works! super solid too! it was fine even after my gearbox exploded! highly recommended!
Perfectly explained calv, thank you!! So I'm guessing the springs on a dmf aren't exactly a serviceable part then? And what sort of problems would all the nvh going through the crank cause with the smf?
Always strughled to grasp all the ins and outs of a clutch
Well potentially breaking it but I've only heard of it happening on a diesel car. I believe its due to the high torque and much higher nvh of a diesel engine.
I dont think dmfs are serviceable, replacement is the only way I think
I am glad I spotted this thread, I have had my stage 2 loba/sachs clutch and flywheel now for about 3000KM and it all works perfectly (so far) but I have the same noise in over run and had never heard anyone talking about it while I was doing all my research for a new clutch. As you said everyone only ever seems to talk about the slight rattling or chatter when the clutch pedal is not engaged etc..
This has now put me at ease.. Didn't realise however that it puts extra stress on the crank.. oh well, I guess there are always a few compromises here and there. I'll just try drive sensibly and smoothly when I am not on track.
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