Years ago my college professor gave the class data points to curve fit and everyone had slightly different curves...It's called curve fitting the data. Overall, that chart is saying wear increased with higher RPM and increased with lower HTHS.
Years ago my college professor gave the class data points to curve fit and everyone had slightly different curves...It's called curve fitting the data. Overall, that chart is saying wear increased with higher RPM and increased with lower HTHS.
Use a computer with a curve fitting tool. Even Excel can do multiple types of data curve fits.Years ago my college professor gave the class data points to curve fit and everyone had slightly different curves...
Can you explain the difference in oil grades used for gear oils vs engine oils?
...no puter in 1981...but I do see yer smiley...Use a computer with a curve fitting tool. Even Excel can do multiple types of data curve fits.
How much 0-20 wateroil will cling to parts between startups against 20-50...I bet that wateroil will leave parts dryer than a popcorn fart..
I was 18 years old at the time....gollygeewhiz...
Actually that gear oil I used was ep130 single grade...from around 1959 or so.View attachment 79566This chart gives some context
Are you sure now? It was a long time ago. You were 18 and all.Actually that gear oil I used was ep130 single grade...
Actually that gear oil I used was ep130 single grade...from around 1959 or so.
Thanx for the effort with that chart...I still think that ep130 was real thick at 10f..
Yep...was a metal pump/lid that clamped on to a 5 gallon tin bucket. Was in the archive section of the yard under weeds and misc stuff. Dad used it in his 38 ford pumkin.Are you sure now? It was a long time ago. You were 18 and all.
Around 1981 or so my pickup was low on oil and was in a hurry not to be late to class. No oil was to be had but there was some 90-130 gear oil so...Actually that gear oil I used was ep130 single grade...from around 1959 or so.
Thanx for the effort with that chart...I still think that ep130 was real thick at 10f..
Yep...was a metal pump/lid that clamped on to a 5 gallon tin bucket. Was in the archive section of the yard under weeds and misc stuff. Dad used it in his 38 ford pumkin
I am certain this makes a good campfire and beer tale which I would gladly partake. .But the fact is you cannot compare what occurred in what I think was 1981 with 21 year old poorly stored gear oil and the difference in a grade or two of modern engine oil.Yep...was a metal pump/lid that clamped on to a 5 gallon tin bucket. Was in the archive section of the yard under weeds and misc stuff. Dad used it in his 38 ford pumkin.
It was ment as a non-tech interesting story about youth and the human condition....and how too thick of an oil can wreck a motor..you do need a beer..I would gladly have one with ya but I don't drink..Around 1981 or so my pickup was low on oil and was in a hurry not to be late to class. No oil was to be had but there was some 90-130 gear oil so...
Weather got cold suddenly couple of weeks later and I ran out to warm up the truck. It started okey but when I came out later to get to class it was not running. Upon inspection one could easily spin the distr
I am certain this makes a good campfire and beer tale which I would gladly partake. .But the fact is you cannot compare what occurred in what I think was 1981 with 21 year old poorly stored gear oil and the difference in a grade or two of modern engine oil.
my point is you used an anecdote beyond reasonable differences between thick and thin modern Recomended engine oils. I am enjoying a red wine by the fireplace, but would drink a beer and hang out with you at anytime.It was ment as a non-tech interesting story about youth and the human condition....and how too thick of an oil can wreck a motor..you do need a beer..I would gladly have one with ya but I don't drink..
That was the purpose of the story...that only a real screwup in oil will wreck a motor! Probably took the long way around..my point is you used an anecdote beyond reasonable differences between thick and thin modern Recomended engine oils. I am enjoying a red wine by the fireplace, but would drink a beer and hang out with you at anytime.
You too, it has been a pleasure.That was the purpose of the story...that only a real screwup in oil will wreck a motor! Probably took the long way around..
Enjoy your evening..ya tired me out..
I've just adopted a policy of going as thick as starting temps allow within reason (usually 0-5w-40 in winter, 10w-40 or even a 50 in the summer), I intend on keeping the engine running as many miles as possible (500k+) and I drive a ton so it's not likely age or rust will kill it, so even tiny amounts of wear differences will make a difference down the line at 300k and above.Yep, I've posted that article before too. Other studies show basically similar information. That's why I use 5W-30 to keep the HTHS viscosity above 3.0 cP.
Sounds like it snapped the wimpy distributor drive shaft, which was a pretty common failure if the engine was turned over in very cold weather with thick oil. I doubt it "wrecked the motor" though.It was ment as a non-tech interesting story about youth and the human condition....and how too thick of an oil can wreck a motor..you do need a beer..I would gladly have one with ya but I don't drink..
ps...I'm on yer side on this topic..
hol upThe only real concern would be more start up wear. Thicker oil takes longer to pump up to the valvetrain of the engine.
This is from a controlled study ... I'd have to go search for the full study, but this is one of the data graphs. Seems to be very similar to the graph given earlier. IIRC, the SWRI (Southwest Research Institute) also did some engine wear study with irradiated engine parts to determine wear rates vs oil viscosity and HTHS viscosity.
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