Starting your tractor in the winter.

[RaydaKub]

If wear is not related to rpms or to the number of turns (what in the world does 'the number of turns' mean?) then engines would last for ever.

Let's get this straight, every single revolution of an engine causes wear. I don't care how many different ways you want to cut it or how the revolutions are made whether by hand, starter, at idle or under load....you are going to have some wear on the engine.

Wear not related to the number of revolutions is one of the most inane things I ever heard.

I think what he is saying is that every revolution of the engine does not cause the same amount of wear as every other revolution. First turn of the engine after being dry for a month will cause more wear than any single revolution in the middle of a day's work. I *think* that's what he meant.

 

[TomSeller]

I think what he is saying is that every revolution of the engine does not cause the same amount of wear as every other revolution. First turn of the engine after being dry for a month will cause more wear than any single revolution in the middle of a day's work. I *think* that's what he meant.

Right, I recall studying this years ago. If I had designed a diesel tractor engine, I would have included a separate electric oil pump to be used similar to the glow plugs, to pre-oil the main engine parts. Then nothing would wear out. Haha

 

[DarkBlack]

If wear is not related to rpms or to the number of turns (what in the world does 'the number of turns' mean?) then engines would last for ever.

Let's get this straight, every single revolution of an engine causes wear. I don't care how many different ways you want to cut it or how the revolutions are made whether by hand, starter, at idle or under load....you are going to have some wear on the engine.

Wear not related to the number of revolutions is one of the most inane things I ever heard.

I was going to reply to him. Thanks for saving me the time

 

[TomSeller]

With good lubrication and mechanical design, metal to metal contact is avoided while running, but not when the engine is static or when starting.

Source: http://www.marinediesels.info/2_stroke_engine_parts/Other_info/hydrodynamic_lubrication.htm
"The rotating shaft drags a wedge of oil beneath it that develops a pressure great enough to support the shaft and eliminate contact friction between the shaft and bearing"

 

[rsallen]

Sorry Tom,
You could oil it any way to Sunday and it would still have a finite number of revolutions before it'd go beyond the tolerances it requires to operate.
Hate to burst your bubble. lol

Other than neglect or abuse the number of revolutions is the single biggest factor of wear.
Otherwise why would we keep track of milage in cars or hours of running a tractor?

 

[DarkBlack]

You must have missed the class in engineering school about linear statistics.
Rpm IS NOT directly tied to rpms and the number of turns.
Check diesel combustion chamber temp just prior to and during combustion with an engine operating at 800 vs 1200rpm.

You just don't get it. A cold unloaded diesel spinning is in an accelerated wear state. If you cold idle at a faster rpm, it may warm up faster,but what you don't seem to get, is that you went through more no-load, engine wearing revolutions to get there.
Don't just come back with more sarcasm. Go read about the generator engines damaged by low loads at 1,800 and 3,600 rpm's. I think you can find a wet stack fatality here on this site. I'll say it again. No load=no heat.

 

[TomSeller]

Sorry Tom,
You could oil it any way to Sunday and it would still have a finite number of revolutions before it'd go beyond the tolerances it requires to operate.
Hate to burst your bubble. lol

Other than neglect or abuse the number of revolutions is the single biggest factor of wear.
Otherwise why would we keep track of milage in cars or hours of running a tractor?

The primary engine wear occurs at start up when there is direct metal to metal contact. On normal operation, given the film of oil separating metal to metal contact, wear is greatly reduced, coming from impurities in the oils or imperfect mechanical design. The link I posted has been well documented in mechanical engineering for eons.

 

[DarkBlack]

The primary engine wear occurs at start up when there is direct metal to metal contact. On normal operation, given the film of oil separating metal to metal contact, wear is greatly reduced, coming from impurities in the oils or imperfect mechanical design. The link I posted has been well documented in mechanical engineering for eons.

That's an old generic explanation of one type of wear. Ever notice UPS trucks shut off at every stop-every day?

 

[TomSeller]

That's an old generic explanation of one type of wear. Ever notice UPS trucks shut off at every stop-every day?

It may be and old explanation, but it is 100% proven. UPS trucks shut down more for fuel savings, not as much to reduce wear. Not every revolution results in equal wear.

 

[rsallen]

Oh I have no doubts about that.
Nor any other of your points, but the fact remains; until the perfect non-fiction lubricant is invented, until the perfect alloys are invented and until we can machine everything to perfect tolerances, each and every mechanical device has a limited number of revolutions.