Think I read somewhere that fewer modern ships burn it as diesel electrics like the Queen Mary 2 become more common. There are no prop shafts and the engines burn gas oil to power generators which in turn power the motors on the azipods.
Just one problem with this theory as well.Ship engines that run on “heavy crude” heat the oil to about 500 degrees before injection.
Dont see many high speed diesels with 100 kw heaters in the fuel tank though
And as for a 2 stroke diesel running backwards oh dear we are in fantasy land now.We are talking diesel 2 strokes here not some bloody BSA Bantam,
they will run backwards and not only GM,s had a little thwaites 3 ton dumper ,and driver stalled it going up the mound , only for him to let the clutch out while rolling down , it sat there running with smoke coming out of the air filter ,was a little 3 cylinder perky from memory
Bking:
And as for a 2 stroke diesel running backwards oh dear we are in fantasy land now.We are talking diesel 2 strokes here not some bloody BSA Bantam,
Obviously you’re too young and inexperienced to have driven 2 stroke diesels, Bedford TM’s fitted with the Detroit had a kill switch on the dash for this very reason, Commer 2 strokes would often run backwards, they had air filters inside the cab which would fill the cab with exhaust fumes before you could stall it and stalling it was a problem as any forward gear selected sent you backwards
Fantasy land ? don’t think so, been there done it ! grow some son !
Think I read somewhere that fewer modern ships burn it as diesel electrics like the Queen Mary 2 become more common. There are no prop shafts and the engines burn gas oil to power generators which in turn power the motors on the azipods.
Just one problem with this theory as well.Ship engines that run on “heavy crude” heat the oil to about 500 degrees before injection.
Dont see many high speed diesels with 100 kw heaters in the fuel tank though
And as for a 2 stroke diesel running backwards oh dear we are in fantasy land now.We are talking diesel 2 strokes here not some bloody BSA Bantam,
they will run backwards and not only GM,s had a little thwaites 3 ton dumper ,and driver stalled it going up the mound , only for him to let the clutch out while rolling down , it sat there running with smoke coming out of the air filter ,was a little 3 cylinder perky from memory
Yes once saw a Gardner do it but thats a four stroke and it was a fault on the pump rack.Just as it stalled it kicked back and sucked air up the exhaust and blew exhaust out the air stack.If you didnt stop it it shagged the engine.Not because it revved to umpteen thousand rpm but because the oil pump was running backwards and was trying to ■■■■ oil out the main gallery and dump it back into the sump.All you had to do was stall the bloody heap of garbage. 2 stroke petrols and 4 stroke diesels can run backwards but once that oil film is lost you can kiss the motor goodbye
Just drop the oil out of a truck engine and let it idle and see how long it is before you hear a bloody big bang.
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
Bking:
And as for a 2 stroke diesel running backwards oh dear we are in fantasy land now.We are talking diesel 2 strokes here not some bloody BSA Bantam,
Obviously you’re too young and inexperienced to have driven 2 stroke diesels, Bedford TM’s fitted with the Detroit had a kill switch on the dash for this very reason, Commer 2 strokes would often run backwards, they had air filters inside the cab which would fill the cab with exhaust fumes before you could stall it and stalling it was a problem as any forward gear selected sent you backwards
Fantasy land ? don’t think so, been there done it ! grow some son !
I always thought brakes worked when going backwards as well you live and learn.
Bking:
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
I am not saying a 2 stroke diesel will runaway in reverse (most need a forced induction ) but they certainly will run backwards.
Bking:
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
I am not saying a 2 stroke diesel will runaway in reverse (most need a forced induction ) but they certainly will run backwards.
Tell me how a 2 stroke diesel runs backwards without violating the laws of physics?
Do you have any idea how a 2 stroke operates.I doubt it.
Bking:
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
I am not saying a 2 stroke diesel will runaway in reverse (most need a forced induction ) but they certainly will run backwards.
Yes in your head.Think about the cycle and what you are saying.
excuse my french but you talk bollox.It cannot happen.
Bking:
In the video the turbo charger fails,the main oil gallery that feeds the crank also feeds the charger.The charger now is an open drain for the oil pump.The pressure drops to zero in the main gallery.The crank is still rotating at 25 revs per second at 1500 rpm.No oil pressure is fed to the mains therfore no pressure to the big ends.Contact happens between the end shells and the crank journal.Heat is produced and the shells weld themselves to the journals,they then spin in the con rod eye producing more heat.This causes the big end bolts to fail and the rod punches through the block.
What colour smoke is produced? White smoke which is diesel without heat as there is now not enough air as the turbo is not pumping into the cylinders so the diesel cannot be burnt.The heat is produced by compressing air.
If it was oil burning it would be blue smoke.
Depends how the turbo actually fails though. On my old clunker of a Peugeot 306 (yes, yes, not a truck engine - but the principle is the same!) an oil seal failed in the turbo resulting in engine oil spraying into the intake airstream. Lifting off the throttle one day, the little engine continued to rev. I pulled over with the poor little thing revving itself like a demented MoT smoke test. Large quantities of dirty grey smoke from the exhaust, too. I stalled it and let it cool off before (gingerly) restarting it and making my way slowly home. Got a secondhand turbo fitted and all was more-or-less OK. The oil seal failure appeared to have been caused by a worn bearing allowing the shaft to “wobble” a bit.
Raymondo please : how the hell do you allow a thing that rotates at 90000 rpm in a volute (air reduction chamber) with a clearance of maybe a tenth of a millimetre a “wobble”?
I do not mean to sound insulting but people like you aint got the faintest idea.Easy to change a turbo go try and build one.This is engineering far beyond me and you.
Bking:
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
I am not saying a 2 stroke diesel will runaway in reverse (most need a forced induction ) but they certainly will run backwards.
Yes in your head.Think about the cycle and what you are saying.
excuse my french but you talk bollox.It cannot happen.
lanz bulldog tractor is a 2 stoke single cylinder diesel, it has not got reverse gear ,you start the engine backwards in order to reverse ,from the 1920,s though ,obviously did not know much back then
Bking:
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
I am not saying a 2 stroke diesel will runaway in reverse (most need a forced induction ) but they certainly will run backwards.
Yes in your head.Think about the cycle and what you are saying.
excuse my french but you talk bollox.It cannot happen.
Well I’ve experienced it first hand happening and witnessed it on several 2 stroke diesels. it’s not bollox and it can happen, but my guess is you were still in nappies when 2 stroke diesels were common.
Bking:
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
I am not saying a 2 stroke diesel will runaway in reverse (most need a forced induction ) but they certainly will run backwards.
Yes in your head.Think about the cycle and what you are saying.
excuse my french but you talk bollox.It cannot happen.
Well I’ve experienced it first hand happening and witnessed it on several 2 stroke diesels. it’s not bollox and it can happen, but my guess is you were still in nappies when 2 stroke diesels were common.
Bking:
So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
Would pay to watch a 2 stroke run without a purge blast,nearly as much as I would pay to watch some old 12 litre push rod donkey rev to ten thousand rpm.
I am not saying a 2 stroke diesel will runaway in reverse (most need a forced induction ) but they certainly will run backwards.
Yes in your head.Think about the cycle and what you are saying.
excuse my french but you talk bollox.It cannot happen.
Well I’ve experienced it first hand happening and witnessed it on several 2 stroke diesels. it’s not bollox and it can happen, but my guess is you were still in nappies when 2 stroke diesels were common.
Still common pal look at any heavy train motor.they are exempt from emission laws.
and they never run backwards.
Bking:
Raymondo please : how the hell do you allow a thing that rotates at 90000 rpm in a volute (air reduction chamber) with a clearance of maybe a tenth of a millimetre a “wobble”?
I do not mean to sound insulting but people like you aint got the faintest idea.Easy to change a turbo go try and build one.This is engineering far beyond me and you.
Humble appologies, oh Great One - I must have imagined the clear signs of metal-on-metal contact on the vanes and turbo body.
And as for a2 stroke diesel running backwards oh dear we are in fantasy land now.We are talking diesel 2 strokes here not some bloody BSA Bantam, So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
For the benefit of Bking with regard to both your quotes from above.
A little lesson in 2 stroke diesel engines. To the un-informed, yes, they probably are from fantasy land but in reality they are a unique piece of engineering, I refer to the Commer 2 stroke which is a 3 cylinder opposed piston horizontal engine, no valves to open and let in a bit of air, no valves to close either. Air is forced in through ports in the cylinder wall by a rootes blower as these 2 stroke diesel engines could not draw their own air in, diesel is then injected in by a centrally mounted injector in each cylinder, after combustion exhaust gases are exhausted via exhaust ports at the opposite end of the cylinder to the inlet ports, in service it was quite a common occurrence for these engines to start in reverse, if they stalled on an uphill incline then rocked backwards the engine would start in reverse. These engines were fitted with an anticlockwise CAV starter, sometimes it had been known for a fitter who was not paying attention to fit a clockwise one (as they looked the same as one fitted to a Perkins 354 or similar engine) this would also cause the engine to run in reverse. For a full explanation of the workings of this engine with diagrams see www.oldengine.org or google Rootes TS3
1970commer: And as for a2 stroke diesel running backwards oh dear we are in fantasy land now.We are talking diesel 2 strokes here not some bloody BSA Bantam, So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
For the benefit of Bking with regard to both your quotes from above.
A little lesson in 2 stroke diesel engines. To the un-informed, yes, they probably are from fantasy land but in reality they are a unique piece of engineering, I refer to the Commer 2 stroke which is a 3 cylinder opposed piston horizontal engine, no valves to open and let in a bit of air, no valves to close either. Air is forced in through ports in the cylinder wall by a rootes blower as these 2 stroke diesel engines could not draw their own air in, diesel is then injected in by a centrally mounted injector in each cylinder, after combustion exhaust gases are exhausted via exhaust ports at the opposite end of the cylinder to the inlet ports, in service it was quite a common occurrence for these engines to start in reverse, if they stalled on an uphill incline then rocked backwards the engine would start in reverse. These engines were fitted with an anticlockwise CAV starter, sometimes it had been known for a fitter who was not paying attention to fit a clockwise one (as they looked the same as one fitted to a Perkins 354 or similar engine) this would also cause the engine to run in reverse. For a full explanation of the workings of this engine with diagrams see oldengine.org or google Rootes TS3
No thanks I have managed to drag myself into the 21st century.But one question how the hell do you have “ports” at both ends of the cylinder?A diesel that does not need compression? You will be telling me next you dont need fuel.
Ah the good old days!
1970commer: And as for a2 stroke diesel running backwards oh dear we are in fantasy land now.We are talking diesel 2 strokes here not some bloody BSA Bantam, So the blower ■■■■■ the air out the cylinder as the piston bottoms,the exhaust valve opens to let in a bit of air, the valve shuts,the piston rises,injection,the piston drops and the blower ■■■■■ out the exhaust and repeat.
For the benefit of Bking with regard to both your quotes from above.
A little lesson in 2 stroke diesel engines. To the un-informed, yes, they probably are from fantasy land but in reality they are a unique piece of engineering, I refer to the Commer 2 stroke which is a 3 cylinder opposed piston horizontal engine, no valves to open and let in a bit of air, no valves to close either. Air is forced in through ports in the cylinder wall by a rootes blower as these 2 stroke diesel engines could not draw their own air in, diesel is then injected in by a centrally mounted injector in each cylinder, after combustion exhaust gases are exhausted via exhaust ports at the opposite end of the cylinder to the inlet ports, in service it was quite a common occurrence for these engines to start in reverse, if they stalled on an uphill incline then rocked backwards the engine would start in reverse. These engines were fitted with an anticlockwise CAV starter, sometimes it had been known for a fitter who was not paying attention to fit a clockwise one (as they looked the same as one fitted to a Perkins 354 or similar engine) this would also cause the engine to run in reverse. For a full explanation of the workings of this engine with diagrams see oldengine.org or google Rootes TS3
No thanks I have managed to drag myself into the 21st century.But one question how the hell do you have “ports” at both ends of the cylinder?A diesel that does not need compression? You will be telling me next you dont need fuel.
Ah the good old days!
3 cylinders, 6 pistons horizontally opposed, the ports were a third of the way up the bore, one or the other port open on inlet or exhaust cycle and both covered by the pistons on compression, with a wade supercharger these little 3 litre motors would pull remarkably well.
