Common rail vs mechanical injection

[LouNY]

Yea, it's been awhile since indirect injection with pencil stream injectors were common.
Spraying a steam of fuel across the cylinder into a power cell to ignite. My Oliver 1550
which even had a manifold heater so a person could feed the engine some warm air to help
it along.

 

[neilkingent]

well, it's been awhile since I've looked at an idi. when I worked in the oilfield in the 70s I guess.

 

[Hay Dude]

My wife just picked up a BMW X-5 with a turbo straight six
you can barely, just barely hear the turbo (as opposed to my 8.3 Cummins which has amazing turbo whistle).
Anyway, my wife doesn’t know a turbo from a transmission and she will pull in the garage and just shut it off. Not terrible, because we live on a long low speed lane before our driveway, but not the best when pulling in somewhere else ff highway then immediate shut down.
Noticed BMW has an pretty loud electric fan that runs after a hot shut down. Wondered if it was tied to an EGT probe for cooling the turbo?

Turbos can be air, oil and water cooled.

 

[Hall00]

The bearings on a turbo are oil cooled.

Whether that oil has additional cooling via water/air/other oil is application depending.

 

[Hay Dude]

The bearings on a turbo are oil cooled.

Whether that oil has additional cooling via water/air/other oil is application depending.

I mean yeah of course, you cant run turbo bearings in water…..
Some turbos have water jackets to circulate coolant through them to aid cooling and lengthen service life.
Garrett GTX turbos are water cooled and there’s others.
Air cooling occurs by fan when still and fan/air blowing over them when in motion.

 

[Chilliwack Murray]

Water jackets are generally to protect the surrounding equipment or people from the turbo heat, very common on marine engines. The only part that requires cooling is the bearing and that is done by a constant flow of oil. Water jackets or oil flow can’t cool the turbine in the exhaust steam.

Shutting off an engine when the compressor wheel is red hot causes the heat to transfer into the bearing and damage it but tractor or automotive size turbos only need a minute or two to cool sufficiently to prevent any damage. Remember these are now everywhere on every kind of idiot proof vehicle, most automotive turbos will survive regular hot shutdown as they’ve had to massively improve the bearing materials.

Even large turbos on engines in the 60-95 litre range only require 5 min max to cooldown.

To correct someone a ways back, turbo life is definitely not measured in hundreds of hours, it’s in tens of thousands. 30-40k hours on a turbo is common on an industrial engine though they are often included in a midlife overhaul around 15k hours.

 

[RickB]

To correct someone a ways back, turbo life is definitely not measured in hundreds of hours, it’s in tens of thousands.

There's so much misinformation and just plain fantasy in this thread I just read and laugh.

 

[Hay Dude]

Water jackets are generally to protect the surrounding equipment or people from the turbo heat, very common on marine engines. The only part that requires cooling is the bearing and that is done by a constant flow of oil. Water jackets or oil flow can’t cool the turbine in the exhaust steam.

Shutting off an engine when the compressor wheel is red hot causes the heat to transfer into the bearing and damage it but tractor or automotive size turbos only need a minute or two to cool sufficiently to prevent any damage. Remember these are now everywhere on every kind of idiot proof vehicle, most automotive turbos will survive regular hot shutdown as they’ve had to massively improve the bearing materials.

Even large turbos on engines in the 60-95 litre range only require 5 min max to cooldown.

To correct someone a ways back, turbo life is definitely not measured in hundreds of hours, it’s in tens of thousands. 30-40k hours on a turbo is common on an industrial engine though they are often included in a midlife overhaul around 15k hours.

Yeah well water cooling improves turbo life in general, according to Holsett

 

[rScotty]

Wondering what the first use of a turbo was on a Compact Tractor? .... say, under 40 HP....?

The first one I can recall off the top of my head was the JD1050, and "tractor data" says that would be 1980.

Anyway, the JD1050 would have a 3 cylinder turboed Yanmar engine, and somehow that doesn't surprise me. An innovative company.
rScotty

 

[RickB]

Wondering what the first use of a turbo was on a Compact Tractor? .... say, under 40 HP....?

The first one I can recall off the top of my head was the JD1050, and "tractor data" says that would be 1980.

Anyway, the JD1050 would have a 3 cylinder turboed Yanmar engine, and somehow that doesn't surprise me. An innovative company.
rScotty

If that wasn't the first it had to have been close. Yanmar had their own presence in North America about that time and had a CUT with a power shift transmission. 336 maybe? I wonder if that was turboed?