Fun Thread on another site. "How long will an average automobile engine run without oil"
Fun Thread on another site. "How long will an average automobile engine run without oil"
(OP)
And think of the old hit n miss engines of the past, with oil cups, oil pressure was at a low ebb in those days.





RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
No oil, no coolant, we tried a third time. This time about 10 shocking minutes into the run something caught fire. The engine continued unabated but the a fire was not going to be allowed by our teacher and we had to shut it down and extinguish the fire before things went completely sideways.
End result.. an engine can potentially run a very long time with no oil. It was felt that the engine being pretty old was a big help in the process of not breaking and that a new 'tight' engine probably wouldn't last long, but that was one test we couldn't afford.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
i guess the amount of load is the important factor: if there is hardly any load temperatures will not rise very fast, so the conditions that would make seizing up likely may not be reached any time soon. in your car the coolant temperature rises quite fast after the start to about the optimal temperature, but under normal driving conditions it may well take about 20 minutes before the oil temperature stabilises. thus, a temperature rise within a journal bearing may take quite some time given sufficient play and low load.
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Not to sidetrack, but engine oil pressure is irrelevant vs flow. Many racing engines for example run at zero pressure but with a large volume of flow, generating pressure being unnecessary work. OTOH generating steady pressure is a great indicator of flow, and I'm among those who hate the newer vehicles being sold without an oil pressure gauge having owned many classics and clunkers with questionable flow.
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Many years ago when I was a youngster, I borrowed my brother's VW Scirraco. I was driving in city traffic when the water temp light came on. I figured I'd limp to the next gas station and check it out. About a block later the engine seized. Turned out it was the oil pressure light, not water temp. The "while you wait" oil change place had stripped the drain plug and stuck a rubber plug in instead. It fell out, stupid youngster didn't recognized the little picture on the warning light and the engine promptly froze. Big brother was not happy!
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Sure about that?
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
What to do? Well, I needed to get home and had no way to call a tow truck anyway, so I just got back in and motored somewhat less briskly the 10 miles home. The engine made it back without incident, and the next morning I put on a new hose, refilled the sump, and drove the 30 miles up to London to work. The engine survived that incident without apparent damage, and I attribute that to the aluminium crankcase which may have dissipated the bearing heat reasonably well, and the fact that the engine was moderately high mileage so not "tight". I assume that this would not have been possible, and I would have been dead in the water if the engine had hydraulic lifters.
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
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RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Steve
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Edit to add an S.
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
It ran for a quite a few hours, lifters clattering away, with no lube, but it ran, very high temps in the pan.
That engine is indestructible!
www.auto-scape.com
Sideways To Victory!
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
I remember an advert in the UK in the 1960s with an old car , touting Molyslip a Molybdenum disulfide compound , They had put this in the engine oil run it for a while , then drained all of the oil out.
They then drove this thing up hill and down dale until the engine seized. It took ten miles.
B.E.
You are judged not by what you know, but by what you can do.
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Found this.
"In 1983 Nulon modified a Holden Commodore engine which had hydraulic lifters to solid lifters, so it would work without oil
They ran the car around for 5k with the E30 additive and then at a public press event, drained the oil from the sump.
The car was then driven by a motoring author and some other guy (neither from Nulon) from Sydney to Melbourne
At all times the oil light was on showing no oil pressure
The car/engine successfully completed the 1031km journey
This "no oil" demonstration has been done often (in the past) in the USA at motorcycle events.
They show an engine mounted on a test frame running, then drain the oil and restart the engine.
Sometimes these demonstrations include actually riding a bike with no oil.
The Briggs and Stratton company decided to perform a back to back test.
They ran two new engines on test frames for 20 hours, one with a (unspecified) PTFE oil additive
They then drained the oil from both and ran the engines for a another 20 hours
Both engines survived this ordeal - so they were run for a second 20 hour interval without oil
Both engines were then torn down and inspected
both engines suffered from scored crankpin bearings,
the engine treated with the additive also suffered from heavy cylinder bore damage that was not evident on the untreated engine.
"
je suis charlie
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Even so major engine loading or not there is still a lot of load from running. It would be nice to see the details of that test.
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Keith Cress
kcress - http://www.flaminsystems.com
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
je suis charlie
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Dont woorry, we all no your a engineer an donot expekt u two be able too speel.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Fun Thread on another site. "How long will an average automobile engine run without oil"
Many years ago I was driving a 5 ton truck for a city electrical department. It was an old GM product with a 6 cylinder engine.
Our truck came back from a scheduled oil change and we went to work. We never drove very hard or very fast. We spent most of the day parked.
On the third day, in a fit of boredom I checked the dipstick. ( Due too union jurisdictions I was not supposed to check the oil.)
Bone dry.
We headed to the shop. After a quiet conversation the sump was filled with oil and nothing was ever said for many years.
I don't remember why there had been no indication of low or no oil pressure.
The truck had never used oil and after the event it seemed to run as well as ever.
It may have had some oil but it took a lot of oil to top it up.
When every one is in coverup mode a lot of details are not determined.
Bill
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"Why not the best?"
Jimmy Carter