Effect of Lubricant Properties and Lubricant Degradation on Piston Ring and Cylinder Bore Wear in a Spark

[Logic]

Stumbled across this:

Effect of Lubricant Properties and Lubricant Degradation on Piston Ring and Cylinder Bore Wear in a Spark-Ignition Engine.

CONCLUSIONS
...This work evaluates the effect of ring and bore
wear on a variety of lubricant properties and lubricant
degradation. Specific results from a 3.4-L V6 engine
show that:

1.
ILSAC GF-2 and GF-3 quality, mineral-based lubricants have similar piston ring and cylinder bore wear rates at steady-state operating conditions.
Piston ring break-in wear after engine assembly is also similar when using GF-2 and GF-3 quality lubricants.

2.
The difference in relative wear rates for different steady-state conditions are similar for the ring and bore and are highly correlated with engine brake mean effective pressure (BMEP).

3.
A fully formulated GF-2 oil with 50% of the standard ZDDP level performed as well as the same oil with 100% ZDDP in terms of piston ring wear.
The same lubricant with 0% ZDDP resulted in piston ring wear rates about twice as high as the 100%-ZDDP baseline.
Bore wear rates were very low and not statistically different between oils with 0% and 100%
ZDDP.

4.
GF-2 quality lubricants that had been aged in city driving for 16,000 miles have similar piston ring wear rates as new GF-2 and GF-3 quality lubricants.

5.
Fully-formulated synthetic lubricants have similar piston ring wear rates as mineral-based
formulations.

6.
A series of lubricants ranging in viscosity from SAE 0W-10 to SAE 10W-40 showed ring wear rates similar to the baseline GF-2 and GF-3 quality lubricants.

7.
Engine operation at reduced coolant and oil temperatures appears to have a much greater effect on ring wear than differences in lubricant properties or lubricant degradation.

This work demonstrates the relative importance of various lubricant characteristics on piston ring and cylinder bore wear.
Neither severely degraded oils nor a wide variation in viscosity show a significant effect on
ring wear, which suggests that wear between the ring and cylinder bore may not be a roadblock to extended oil-change intervals.
Cold operating temperatures appear to be very significant in controlling ring/bore wear.

ie: Engine oil And coolant heaters have another reason for being considered.

[freebeard]

FYI:

Originally Posted by DDG

eVWParts.com
ZDDP Plus Oil Additive at evwparts
ZDDP is a additive to replaced what the oil companies had to remove when catalytic converters were installed on vehicles. VW air cooled engines need the Zinc and Phosphorus that ZDDP provides.. ZDDP Plus is not a typical oil additive.

It's the flat tappets that wear.

[Logic]

As I treat all my engines with Boric Acid; almost none of these lubrication issues apply to me.

I just found:

...Engine operation at reduced coolant and oil temperatures appears to have a much greater effect on ring wear than differences in lubricant properties or lubricant degradation.

...Cold operating temperatures appear to be very significant in controlling ring/bore wear.

interesting.

[Isaac Zachary]

Be careful what you put in your oil.

https://www.youtube.com/watch?v=IsjKLqUnwyU

[Logic]

Originally Posted by Isaac Zachary

Be careful what you put in your oil.

Not falling for that again.
While it's cheap and simple to test on an old worn, smokey engine; I'm quite happy to be the only Ecomodder reaping the rewards of BA.
But do go look at Argonne National Labs' research if you like.

[freebeard]

@boomerspeed0124
2 weeks ago
I was expecting fuel/oil additives to be like STP, Lucas Oil, etc... Not metal shavings, dirt/sand, grinding compound, anti-seize or sugar?????.......... Who would ever do this????

This comment saved some time. If it doesn't test Boric Acid, it's worthless to us.

[freebeard]

What I did with that time was watch this:

The $15 WWI Aviation Liquid That Stops Engine Wear FOREVER. BURIED Since 1948.

Be Warned: Watching the AI slop video will rot your brain -- pix of hands pouring motor oil over unassembled engine components, etc. But it's very interesting because it's narrated by John AG.

Now John AG first showed up in videos trying to move the Silver and Gold markets. I first became interested when (he or it as the case may be) turned to disrupting Big Concrete with geopolymer recipes.

This one is about Molybdenum disulfide, but the geopolymer series covered vinegar, urea, seawater/electricity, bacteria and potato starch so more tribological hacks may be coming.

[Logic]

Originally Posted by freebeard

What I did with that time was watch this:

Be Warned: Watching the AI slop video will rot your brain -- pix of hands pouring motor oil over unassembled engine components, etc. But it's very interesting because it's narrated by John AG.

Now John AG first showed up in videos trying to move the Silver and Gold markets. I first became interested when (he or it as the case may be) turned to disrupting Big Concrete with geopolymer recipes.

This one is about Molybdenum disulfide, but the geopolymer series covered vinegar, urea, seawater/electricity, bacteria and potato starch so more tribological hacks may be coming.

IIRC MoS2 is prone to oxidation/rusting.
That is especially a problem in engines as:
Ideal combustion is: Hydro-Carbon + O2 => H2O + Carbon.
That means there is a 'lot' of oxidising water in engine oil.

This water also combines with (by)products of combustion to form acids that cause chemical pitting of bearing etc surfaces.

The beauty (one of) of Boric Acid is that it turns this water 'enemy' into a friend:
Any Boric 'oxides' formed by engine heat are turned back into 'Almost Super' Lubricious BA and
Anywhere that the initial hard, chemically inert ceramic layer is scratched, or worn, off of metal surfaces, is auto re-coated...

( @ freebeard: well done... )