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Discussion Starter · #1 · (Edited)
Not my car

Edit: I probably messed up my terminology on "milled" or "machined". I'm trying to discern the difference between the flat surface on a/m stuff vs. this grooved ones.


This could be a normal thing for OEM clutch components, but it looks like the clutch pressure plate and the flywheel are both milled, not machined flat. This means it'll be some time before both are mated with the clutch. It may be best to avoid hard launches and slipping the clutch until I would estimate to be 5000km+. This particular car the scent+slippage apparently was very noticable. The milled surface looks to have been polished instead of gradually worn with the clutch. The clutch surface also looks like the grooves have polished their lines onto them. Once they get polished, not only do you only have half the surface area because of the milled surface, but now that's also slippery.

Some info:
Clutch/Flywheel/Pressure plate manufacturer: Luk
Flywheel surface area diameter: 246mm
Flywheel surface area: 48mm from outside to inside
Clutch diameter: 238mm diameter
Clutch material: 34mm from outside to inside
Pressure plate surface area diameter: 240mm
Pressure plate surface area: 44mm from outside to inside

Clutch:
Automotive tire Infrastructure Road surface Automotive wheel system Rim


Pressure plate:
Tire Automotive tire Wood Automotive design Rim


Pressure plate hotspots:
Automotive tire Wood Rim Composite material Automotive wheel system


Flywheel hotspots+milled surface:
Automotive tire Rim Crankset Grey Automotive design


Pressure plate Luk stamp:
Automotive tire Automotive design Motor vehicle Rim Automotive wheel system


Flywheel Luk stamp + overall view:
Wheel Tire Automotive tire Tread Synthetic rubber


Polished groove lines (brighter) + unused clutch material grooves (darker):
Fluid Automotive tire Wood Liquid Water
 

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Oy. Wonder how badly this thing was thrashed.

When I researched this topic in the past regarding why (for the most part) OEM clutches don't usually prematurely fail after getting run hard during test drives and whatnot, the answer was because they are machined differently, whether that's more exact tolerances, or like you pointed out, radial machining instead of crosshatching. Either way, this clearly failed from abuse.
 
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