Common Rail?
- Thread starter phoenix
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Bushtoy
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very basically, a common rail diesel has a high pressure pump feeding a pipe that runs next to the injectors at about 1600psi. there is a pressure regulator on this "common rail" which keeps supply pressure to all injectors constant. a TD5, for example, is not a common rail diesel. the pressure is built up to abt 1600psi in the injector using a cam on the cam shaft. the cam depresses a plunger in the injector which boosts the fuel pressure just prior to injection. make sense??
More .... the pump in the fuel tank pressurses fuel to 4 BAR/60 psi, and passes that to the cylinder head where the fuel surrounds the injectors and keeps them filled. Every firing stroke, a pushrod driven by a separate camshaft strikes the top of the injector and drives the plunger into the injector body creating ENORMOUS pressure (well over 1,500 BAR) in the injector, and spraying some fuel into the cylinder. Fuel delivery is controlled by an electronic spill-valve which returns unused (but now VERY hot) fuel back to the fuel gallery, and then through a water-cooled fuel cooler and back to the tank/pump system.
When it works properly, this system can be extremely efficient.
But a 200tdi is nearly as good and needs only one electric wire!
CharlesY
Bushtoy
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yip u right...more like 20,000 plus psi...wonder what it would do if u put yer finger there??
Bushtoy
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phoenix, they both work well, but i would hazard a guess and say that common rail is more reliable and definately cheaper to maintain if you do have problems. The injectors for a TD5 cost a small fortune here, about as much as a small car!!
transit engine has proven to be extremely reliable and robust...built like a brick s**t house
transit engine has proven to be extremely reliable and robust...built like a brick s**t house
Just because it is possible, does NOT mean it's a good idea!
The 200 tdi is a tough simple reliable engine, and very well suited to the Landies it was used in. And ONE leccy wire to keep it running!
The TD5 has more wires and computers than GCHQ.
Nightmare in the long run, but in due course there will become available UPGRADES to convert TD5 Discos to 200tdi or 300 tdi Discos.
I have my donor car sitting in my yard already.
CHarlesY
The 200 tdi is a tough simple reliable engine, and very well suited to the Landies it was used in. And ONE leccy wire to keep it running!
The TD5 has more wires and computers than GCHQ.
Nightmare in the long run, but in due course there will become available UPGRADES to convert TD5 Discos to 200tdi or 300 tdi Discos.
I have my donor car sitting in my yard already.
CHarlesY
CharlesY
I have a SI 1998 disco with a 300tdi, she has 145k miles on her and I'm hoping to run her until she's at 175k and if she blows up then so be it, that's why I'm interested / budgeting for the defender 2007 model ( the new disco doesn't do it for me), so you're saying the 300 tdi is a good place to be?
I have a SI 1998 disco with a 300tdi, she has 145k miles on her and I'm hoping to run her until she's at 175k and if she blows up then so be it, that's why I'm interested / budgeting for the defender 2007 model ( the new disco doesn't do it for me), so you're saying the 300 tdi is a good place to be?
Just because it is possible, does NOT mean it's a good idea! That applies to TD5 engines, Disco 3, and other smart-arse so called improvements.
The 200 tdi is a tough simple reliable engine, and very well suited to the Landies it was used in. And ONE leccy wire to keep it running! The 300 tdi is a little more electified, but manageable.
The TD5 has more wires and computers than GCHQ, and is designed to FORCE owners to take them to main stealers who get your money.
The whole point of modern car designs in ONLY to make profits, and the ONLY way they can do that is by taking our money. Full stop.
The TD5 will become a nightmare in the long run, but in due course there will become available UPGRADES to convert TD5 Discos to 200tdi or 300 tdi Discos.
I have my donor car sitting in my yard already.
CharlesY
The 200 tdi is a tough simple reliable engine, and very well suited to the Landies it was used in. And ONE leccy wire to keep it running! The 300 tdi is a little more electified, but manageable.
The TD5 has more wires and computers than GCHQ, and is designed to FORCE owners to take them to main stealers who get your money.
The whole point of modern car designs in ONLY to make profits, and the ONLY way they can do that is by taking our money. Full stop.
The TD5 will become a nightmare in the long run, but in due course there will become available UPGRADES to convert TD5 Discos to 200tdi or 300 tdi Discos.
I have my donor car sitting in my yard already.
CharlesY
hurt
bez_man
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er, gone?
boydy1989
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What davec says. Emissions controls kill the ability to have a simple engine.
Common rail doosels are, as was also said, more finely controlled, so more efficient. But its this control gear, again as already said, that is more likely to fail in such a way that it can't be fixed by a home mechanic.
The 300TDi needs one wire to keep it running - mine fell of the other day
This is assuming the EGR is bypassed.
The Puma tranny engine WAS modified to put in the LR: The Dual Mass Flywheel was lost, cos it made the engine unstable at low RPM, the ECU was 90% re-programmed, and the oil delivery system was redesigned to allow it to run at greater angles.
That is probably why you can't get the bigger engine, cos it hasn't been developed to work.
My 300TDi has done 160,000 miles in a disco, i hope it does more than 15,000 in my 90!
Common rail doosels are, as was also said, more finely controlled, so more efficient. But its this control gear, again as already said, that is more likely to fail in such a way that it can't be fixed by a home mechanic.
The 300TDi needs one wire to keep it running - mine fell of the other day
This is assuming the EGR is bypassed.
The Puma tranny engine WAS modified to put in the LR: The Dual Mass Flywheel was lost, cos it made the engine unstable at low RPM, the ECU was 90% re-programmed, and the oil delivery system was redesigned to allow it to run at greater angles.
That is probably why you can't get the bigger engine, cos it hasn't been developed to work.
My 300TDi has done 160,000 miles in a disco, i hope it does more than 15,000 in my 90!
parky91
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hi, could anyone tell me if my r reg 300tdi 90 will have a common rail injection ?
cheers
Andrew
cheers
Andrew
If it is a 300 tdi LandRover engine, it is definitely NOT a common-rail diesel.
It will have a Bosch fuel rotary injection pump, one of two variations depending on age.
The OLDER version of the IJ pump is probably better as it has less electronics.
CharlesY
parky91
Active Member
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do you happen to know if the 300 tdi is common rail ?
I can't seem to find anything saying whether it is or isn't.
Cheers
Parky
