Thinner oils wear more the engine at startup Proof

[kenv]

Originally Posted By: 2010_FX4
So I have to ask--was there "official" proof anywhere in this thread? Did I miss it in between the bovine scatology or?


Bovine scatology

Now that`s pretty [censored] funny!!!

 

[KrisZ]

Originally Posted By: Gokhan
Wear at idle has nothing to do with oil pressure. There are no pressure-lubricated (hydrostatic-lubricated) parts in the engine. Oil pressure has no effect on wear -- it merely helps to circulate the oil. Wear at idle results from low RPM, not low oil pressure, as lower RPM decreases the oil-film thickness.

For example, when the engine stops, bearings and crankshaft make contact. This is not because of lack of oil pressure -- it's because of lack of RPM. Increasing RPM decreases the wobbling of the crankshaft in the bearings and increases the oil-film thickness. This applies to other parts of the engine as well.


Another good and goes totally against the wisdom constantly repeated here that using a thinner oil then specified by the manufacturer will reduce wear on cold starts.

 

[Pontual]

Originally Posted By: Shannow
You missed a bit off your explanation...

If rod and piston weigh (say) 1KG, idle 900RPM, on a 3" crank, there's .3KN load on the bearing at TDC exhaust stroke...a little more than "nothing"


Double aham ... compare with WOT and you'll see where the load is.

 

[Pontual]

Originally Posted By: spasm3
Originally Posted By: Shannow
You missed a bit off your explanation...

If rod and piston weigh (say) 1KG, idle 900RPM, on a 3" crank, there's .3KN load on the bearing at TDC exhaust stroke...a little more than "nothing"


Plus the force of compression and subsequent expansion of the fuel/air mix also is transmitted to the bearing surfaces


A cubic Aham for that one also. Taking off with the car at 6000 rpms is lighter job?

 

[crazyoildude]

this oils do not wear more than thicker oils of the same quality during start up

 

[GenesisGuy70]

I think it sounds like #2 on both startups.

There's my rich insight.

 

[Shannow]

Originally Posted By: Pontual
Originally Posted By: Shannow
You missed a bit off your explanation...

If rod and piston weigh (say) 1KG, idle 900RPM, on a 3" crank, there's .3KN load on the bearing at TDC exhaust stroke...a little more than "nothing"


Double aham ... compare with WOT and you'll see where the load is.


"no load at the bearing" ???

Ahem yourself...