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Perhaps I should clarify, Diesels arent at 100% boost all the time, but aside from boost pressure, there is nothing that regulates the supply of air into the engine. The max amount of boost is limited by the waste gate, and the turbo spins as fast as the engine rpm and load can push it.
Ahhh I see, so theres no really MAF or anything like that? Sort of like the engine just breathing naturally.
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Ahhh I see, so theres no really MAF or anything like that? Sort of like the engine just breathing naturally.
Exactly, that is where the Diesels strength comes from, because unlike a gas engine, no fuel enters the chamber with the air. The fuel injector sits in a diesel where the spark plug sits in a gas engine. And instead of a spark igniting a fuel/air mixture, the fuel injector fire a jet of perfectly atomized fuel into pure air. The air is heated to a temp between 1000-1300 degrees by the compression stroke (which is why diesels have comp ratios of around 18-25:1). So a diesel can force as much air into the cylinders as you want without any risk of the fuel combusting before you want it to, as the injection timing is controlled by the computer.
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"A man has no principles or morals, if he does not act with great conviction upon those which he claims to have."
"For some reason beyond all rational and logical thought, an arcane belief continues to exist. That the actions of one somehow warrants the limitation, or even the revocation, of the unalienable liberties of another. While the intentions behind this rationale could be considered noble, it is unexcusably naive, and must be resisted at all costs."
Exactly, that is where the Diesels strength comes from, because unlike a gas engine, no fuel enters the chamber with the air. The fuel injector sits in a diesel where the spark plug sits in a gas engine. And instead of a spark igniting a fuel/air mixture, the fuel injector fire a jet of perfectly atomized fuel into pure air. The air is heated to a temp between 1000-1300 degrees by the compression stroke (which is why diesels have comp ratios of around 18-25:1). So a diesel can force as much air into the cylinders as you want without any risk of the fuel combusting before you want it to, as the injection timing is controlled by the computer.
Interesting. I wonder, do diesels have any applications with motorcycles?
My carb'd Suzuki 200 gets 105 MPG with some short shifting, I bet a diesel 200 c.c. would get like 250 mpg!
Because those are what the engine's computer controls, remember, there is no throttle body, no spark plugs, no ignition timing.
Diesels work off of an entirely different system, there is no need to replace a diesel's fuel pump because 95% of the fuel is returned to the tank in the first place, plenty of room for increased fuel rate and pressure.
it's really more like 65% of the fuel.
The turbos' waste gate is also controlled by the computer, so if you need more air you just tell it to give it more air. Remember, Diesels run at 100% air all the time.
The fuel injector nozzle tips are designed to perfectly atomize the diesel fuel, they are already as good as they can get, to get more fuel you just increase the amount that is allowed into them before they inject.
Like I said, diesels are programmed for the optimum combination of pulling, mpg, and engine life. Their max stock power capability are far above what they are programmed for from the factory.
Interesting. I wonder, do diesels have any applications with motorcycles?
My carb'd Suzuki 200 gets 105 MPG with some short shifting, I bet a diesel 200 c.c. would get like 250 mpg!
I think a few companies are working on that, the hard part is getting everything small enough to fit on a normal sized bike. Because the one downside to a diesel, is that they HATE to be naturally aspirated, they run perfectly fine, just inefficient. Diesels LOVE air, but pistons suck at moving air, which is why 99% of diesels have a turbo. So getting the turbo, charge-air-cooler and the piping to fit nicely in a bike would be tricky. Now a N/A diesel would work, but it wouldn't have any noticeable mpg improvement over a gas, in that size class. There are a couple Diesel bike in production, one is for the military, and they other is a big Harley cruiser type.
__________________
"A man has no principles or morals, if he does not act with great conviction upon those which he claims to have."
"For some reason beyond all rational and logical thought, an arcane belief continues to exist. That the actions of one somehow warrants the limitation, or even the revocation, of the unalienable liberties of another. While the intentions behind this rationale could be considered noble, it is unexcusably naive, and must be resisted at all costs."
I think a few companies are working on that, the hard part is getting everything small enough to fit on a normal sized bike. Because the one downside to a diesel, is that they HATE to be naturally aspirated, they run perfectly fine, just inefficient. Diesels LOVE air, but pistons suck at moving air, which is why 99% of diesels have a turbo. So getting the turbo, charge-air-cooler and the piping to fit nicely in a bike would be tricky. Now a N/A diesel would work, but it wouldn't have any noticeable mpg improvement over a gas, in that size class. There are a couple Diesel bike in production, one is for the military, and they other is a big Harley cruiser type.
I saw a diesel bike on tv. It had a diesel from a 1 series BMW on it.
And again, that depends on the engine, the Series 60 has a low-pressure high-volume pump, and it only needs roughly 5% of the fuel that runs through the head. But it is a Unit Injection style fuel system.
__________________
"A man has no principles or morals, if he does not act with great conviction upon those which he claims to have."
"For some reason beyond all rational and logical thought, an arcane belief continues to exist. That the actions of one somehow warrants the limitation, or even the revocation, of the unalienable liberties of another. While the intentions behind this rationale could be considered noble, it is unexcusably naive, and must be resisted at all costs."
And again, that depends on the engine, the Series 60 has a low-pressure high-volume pump, and it only needs roughly 5% of the fuel that runs through the head. But it is a Unit Injection style fuel system.
true, but i've yet to see EUI's on a light duty pickup. it all seems to be hydro-mechanical injection. i'd love to see what could be done to a light duty truck with EUI's though
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