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Best use of a 1271 EVER!

  • Thread starter Thread starter stormchaser
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stormchaser

stormchaser

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  1. OWNER - I own a Hatteras Yacht
Hatteras Model
53' MOTOR YACHT (1969 - 1988)
OMG...I SO want one. Actually, I'd like a Chevy Nomad with a 8v71TI...wonder if it would fit under a Nomad hood?
 

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Oops...wrong forum...can a mod move this to the sand bar, please?
 
Hmmmm....I wonder if it'll tow my 41......
 
Probably pretty well...it is a truck. :) It's a 1960 Peterbuilt that is now owned by Jay Leno (he named it "Pissed Off Pete"). Video with sound of Pete being revved up...

http://www.youtube.com/watch?v=pOVJG1DgwJs
 
Pretty cool ! Too bad they changed the pipes on it tho... ;-((
damn bunny huggers! ws
 
Am I mistaken or is one of the worst things you can do before shutting down a diesel to ramp up the RPMS, get the suopercharger/turbo spinning fast ...then shut the engine off and kill the lube oil pressure??
 
REBrueckner said:
Am I mistaken or is one of the worst things you can do before shutting down a diesel to ramp up the RPMS, get the suopercharger/turbo spinning fast ...then shut the engine off and kill the lube oil pressure??
Click to expand...
Supercharger shuts off immediately because it is mechanically driven by the engine. Turbos tend to blow up that way, but that engine was a natural so, no turbo = no problem.
 
Even on turbos, short bursts wont be a problem...its sustained boost that heats them up...and you want to cool them off before shutting down.
 
It's not just the heat, although that is probably the biggest factor. Big turbos like that can spin up to 80,000 RPM and you don't want to shut off the oil supply while they're doing that or anything remotely resembling it.
 
IMHO... in all actuality, the lube oil helps cool down the mass, and if shut off hot the oil supply lines and bearings cook with oil in them and that causes "coking". Next time you start up the supply will starve for oil. ws
 
Scrod said:
It's not just the heat, although that is probably the biggest factor. Big turbos like that can spin up to 80,000 RPM and you don't want to shut off the oil supply while they're doing that or anything remotely resembling it.
Click to expand...

Oil pressure doesn't provide the lube, the oil film does. There is most likely enough oil film after shutdown to keep the bearings lubed until the turbo stops.
 
Plain bearings, like those on a recip. engine's connecting rods, are really not bearings at all. These require preassure oil to fill the gap between the crankshaft throw and the, (so called), bearing. The oil is the actual bearing. Those inserts are actually just a soft metal used to prevent small pieces of junk from scratching the crankshaft. Roller bearings, ball bearings, and needle bearings only require a film of oil for lubrication and don't rely on preassure.:)
 
Maynard,
Now you have me distracted.
How does the oil pump maintain oil under pressure to the crankshaft "bearings"?

Vincent
 
krush said:
Oil pressure doesn't provide the lube, the oil film does. There is most likely enough oil film after shutdown to keep the bearings lubed until the turbo stops.
Click to expand...
I never said anything about oil pressure. Turbocharger bearings aren't pressure lubricated at all. My concern was about the film disappearing when the supply was shut off and the turbo was spooling at high RPM and the oil is hot and thin.

As I noted, heat is the major factor, along the lines of yachtsmanbill's post about oil coking. But I didn't elaborate because I didn't want to get that involved in a nit-picky technical discussion but now I have anyway thank you very much mister engineer. :rolleyes:
 
Vincentc said:
How does the oil pump maintain oil under pressure to the crankshaft "bearings"?
Click to expand...
It pumps more oil in than leaks out through the clearances.
 
Maynard Rupp said:
Plain bearings, like those on a recip. engine's connecting rods, are really not bearings at all. These require preassure oil to fill the gap between the crankshaft throw and the, (so called), bearing. The oil is the actual bearing. Those inserts are actually just a soft metal used to prevent small pieces of junk from scratching the crankshaft. Roller bearings, ball bearings, and needle bearings only require a film of oil for lubrication and don't rely on preassure.:)
Click to expand...

Your so called bearings ARE a true bearing and the oil is merely a micro film to keep the babette bearing surface from galling against the hard crank journal.
Most of our Detroit's will run on 5 PSI of oil pressure and that's not much. The bearing gap is in the thousands of an inch. There is an add for a synthetic oil that shows an auto engine running for weeks with zero oil pressure.
Most engines use a babette (lead composite) half shell bearing. I was the chief design engineer for a major bearing manufacturing company. We produced main, crank and rod bearings in different types or grade of Babette. We also produced sintered bronze bearings for automatic transmission. Just because it's not a steel roller ball bearing, it is still a bearing. If oil was the bearing you could use polished case hardened rods and never need a rebuild. In the past there were contest where they would run an engine and you would pay for a guess on how long the engine would run with no oil pressure.
All half shell babette bearing have a V groove in the middle of the bearing. Main bearings have a groove and a hole that feeds oil to the bearing along with the rod journals. The crank shaft journals have a hole that line up with the bearing and supplies the oil to the bearings.
Oil that does not flow through a roller bearing in a turbo will soon fail due to heat burning the oil and leaving deposits in the bearing galling the microsurfaces in the bearing.

BILL
 
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