Dual-Fuelâ„¢ technology enables a heavy-duty diesel engine to operate on a high proportion of natural gas. Firstly, a Dual-Fuelâ„¢ engine is a diesel engine, unchanged in its basic thermodynamic operation. However, with Dual-Fuelâ„¢, diesel combustion is used only to ignite a metered charge of natural gas and air. A small injection of diesel is made to ignite the gas and air. This is called a pilot injection. The pilot injection is delivered by the standard, un-modified diesel injection system fitted to the engine. Once ignited, the gas and air charge burns rapidly and cleanly. By using diesel pilot ignition and retaining the diesel’s high compression ratio, the gas combustion can be achieved at very lean air-fuel mixture ratios. Known as “lean-burn”, this delivers high efficiency and low NOx emissions. The high compression ratio of the diesel engine can be retained due to the high auto-ignition temperature of methane, the main constituent of natural gas. A diesel engine is the most efficient engine for road-transport. It is significantly more efficient than a spark-ignited engine due to:
-Higher compression ratio (higher compression pressure in the cylinder)
-Very lean-burn combustion (excess air combustion)
-No throttle to cause additional pumping work on the engine
The Dual-Fuelâ„¢ engine retains all of these attributes and achieves similar efficiency to the diesel engine — after all, it is still a diesel engine.
Brentanna:
Carryfast are you really that [zb] stupid I mean really. There have been people posting on here that have used them just because you live in such a small corner of the world that you havent doesnt mean they do not exist. Have you ever seen a neutron ? How about s single molecule of hydrogen. They exist dont they or are you going to argue because you havent seen them that they dont?
Sounds good in theory but that’s just theory.So there’s loads of haulage firms wasting thousands of pounds in fuel costs and going out of business when they could be using fuel at half the cost. If they exist then someone’s wasting a lot of money.
hahahahahahaha he is about 20 posts behind isnt he BJD has already shown you the link and additional info and you are too lame to get it still. God you need some professional help.
Brentanna:
Carryfast are you really that [zb] stupid I mean really. There have been people posting on here that have used them just because you live in such a small corner of the world that you havent doesnt mean they do not exist. Have you ever seen a neutron ? How about s single molecule of hydrogen. They exist dont they or are you going to argue because you havent seen them that they dont?
Sounds good in theory but that’s just theory.So there’s loads of haulage firms wasting thousands of pounds in fuel costs and going out of business when they could be using fuel at half the cost. If they exist then someone’s wasting a lot of money.
Really? You think everyone should scrap their existing equipment that still has years of life left in it just to takeup the new technology?
Would you do that if you knew HMG could up the duty on the “cheap” fuel tomorow if they felt like it?
well maybe he needs to get out of the kitchen and take off the apron more often. I mean this chick knows more about this stuff than a man with all knowing wisdom, who thinks women should be just cleaning house and making meals.
Brentanna:
well maybe he needs to get out of the kitchen and take off the apron more often. I mean this chick knows more about this stuff than a man with all knowing wisdom, who thinks women should be just cleaning house and making meals.
If you don’t mind, I’ll stay out of this particular discussion thankyou
Thats ok the score now is 3 -0 in my favor maybe one of these days he will learn to research first spout off latter. He has lost evry debate we have been involved in.
Brentanna:
Carryfast ummmmm correction you havent seen duel fuel application diesel engines. I have news for you in the 1950’s there were diesel engines you started on gas and then switched over to diesel.
There were dual fuel engines LONG before the 50s.
In the early 1900s (if not even earlier) canal boats were using Bolinder engines which started on kerosene (with a heating element, called a hot bulb. This was a copper ball, heated by blowlamp on a rod going into the cylinder to conduct heat inwards). They ran on heavy oil, once they got up to working temperature.
They were called Semi Diesels Bolinders
Wow. Scintillating bed time reading, especially after a couple of very generous Glenfiddichs. (Wonder what psi compression it requires to combust?).
In what, must be nearly 10 years on Tnet, I don’t think I have ever before witnessed any topic discussed in such technical detail. I guess that there are very few of us commenting is in itself an indication we may have left more than a few behind either technically or out of sheer boredam. Certainly when I requested more detail regarding unit/trailer air operated service/secondary/park braking systems we never got anything like this deep. But then I didn’t argue against what information I was kindly given.
I note that I am the only poster in this thread who no one acknowledged except the infamous CF himself.
No-one answered the fork lift truck engine question which I think is very relevant here.
One thing being discussed is can petrol combust without a spark? Yes it can, but CF it wouldn’t be cost effective in a road transport vehicle as it doesn’t produce the mpg that diesel can. (and that’s as technical as I’m going).
How do i know petrol can compression ignite? I’d guess most of you in this thread would have driven cars with carburretors?
Remember how if they were running a bit advanced/hot/idling fast they used to run on after the key was turned off therefor stopping the spark? Proof indeed.
I have spent some considerable time in LOS… the Land of Smiles, Thailand. There almost all the 1000’s of Toyota Corolla taxis are on LPG, they run on too. (they often idle rather fast).
I recently sadly lost a friend of some 30 years. He was never, ever wrong, even when the conclusive proof was printed & laid infront him!
I am reminded of him here. RIP Mickey.
Brentanna:
Carryfast ummmmm correction you havent seen duel fuel application diesel engines. I have news for you in the 1950’s there were diesel engines you started on gas and then switched over to diesel.
There were dual fuel engines LONG before the 50s.
In the early 1900s (if not even earlier) canal boats were using Bolinder engines which started on kerosene (with a heating element, called a hot bulb. This was a copper ball, heated by blowlamp on a rod going into the cylinder to conduct heat inwards). They ran on heavy oil, once they got up to working temperature.
They were called Semi Diesels Bolinders
Heavy oil being what we commonly refer to as Diesel. (see your diesel car or truck log book).
So what is that thick black tar like [zb] that ships & some commercial heating boilers run on called?
Brentanna:
Carryfast ummmmm correction you havent seen duel fuel application diesel engines. I have news for you in the 1950’s there were diesel engines you started on gas and then switched over to diesel.
There were dual fuel engines LONG before the 50s.
In the early 1900s (if not even earlier) canal boats were using Bolinder engines which started on kerosene (with a heating element, called a hot bulb. This was a copper ball, heated by blowlamp on a rod going into the cylinder to conduct heat inwards). They ran on heavy oil, once they got up to working temperature.
They were called Semi Diesels Bolinders
I have a vague recollection of my dad talking about TVO, tractor vapourising oil, which involved starting the tractor engine on one fuel (may have been diesel) and then switching to TVO once the engine had warmed up. I think TVO may have been similar to parafin.
Just in passing, not in the least relevant to any of this:
One of dad’s early jobs was trailer man on a wagon & drag. The drag had seperate brakes operated by the trailer man.
Driveroneuk:
Wow. Scintillating bed time reading, especially after a couple of very generous Glenfiddichs. (Wonder what psi compression it requires to combust?).
One thing being discussed is can petrol combust without a spark? Yes it can, but CF it wouldn’t be cost effective in a road transport vehicle as it doesn’t produce the mpg that diesel can. (and that’s as technical as I’m going).
How do i know petrol can compression ignite? I’d guess most of you in this thread would have driven cars with carburretors?
Remember how if they were running a bit advanced/hot/idling fast they used to run on after the key was turned off therefor stopping the spark? Proof indeed.
Ah yes, but that was an old engine running on, which was caused by the baked on soot on the inside of its cylinder head still glowing hot enough to ignite your petrol. So not really compression ignition.
Big Jon’s dad:
I have a vague recollection of my dad talking about TVO, tractor vapourising oil, which involved starting the tractor engine on one fuel (may have been diesel) and then switching to TVO once the engine had warmed up. I think TVO may have been similar to parafin.
Hi BJD,
When I first left school, I worked on a farm.
The farmer was quite elderly, so he easily remembered the inter-war years, and he definitely mentioned TVO.
Much water has passed under the bridge and I’ve a sleep or two since, but I’m pretty sure that paraffin was mentioned in the same conversation.
My grandfather has an very old J Case tractor there was a small tank of gasoline when you went to start it you had to open the gas valve, start turning the motor and shut the valve and open the diesel line from the pump it was a pull lever. Im a farm girl
like I said you are thinking 2 dimentional when 3 are required
