Possibility of Diesel Toyotas/Lexus in US with revised EPA rules under Trump?
#47
Lexus Fanatic
So like I thought.
Last edited by SW17LS; 04-26-17 at 05:16 PM.
#48
Lexus Champion
iTrader: (3)
I'm not trying to deliberately argue, but I can't totally agree with that. The air/fuel mixture, even in a diesel, does matter to some extent. A diesel engine works by ultra-high compression ratios of (roughly) 20:1, as opposed to those of a typical gas engine about half of that, at 10:1. In general, the heat of that high compression fires off the air-fuel mixture, rather than an electrically-generated spark. The air-fuel mixture has to be tuned and regulated for the exact characteristics of the heat and compression each engine will generate, or else it could fire off or ping/detonate too early, causing possible internal engine damage, or too late, wasting power and adding to emissions.
Preignition has never been an issue even with old indirect injection diesels because diesel fuel is not as volatile as petrol, and its a complete non issue with modern direct injected diesels. Preignition in a DI diesel can't occur, because only air is being compressed during compression cycle, and fuel is injected (under insanely high pressures 25-30,000psi) at TDC where it ignites. Thus you can lean out diesel AF ratio as much as you want, and the leaner the mixture the cleaner it burns. This is the primary reason why diesels are so economical, you can lean out the mixture completely during idle and during low load, where only tiny amount of fuel is delivered just enough to keep the engine turning itself, where in petrol engines AF ratio must be kept in a certain range.
Yes, and these high pressure injection systems are expensive to produce and maintain, very fragile, and extremely sensitive to any contamination and water. It can sometimes cost over $1,000 just to replace a single injector.
#49
If you want economy diesel is the way to go. Higher heat value of the fuel, less pumping losses and greater expansion area, all mean more efficiency. And as far as mineral fuel burning engines go, diesel engines beat all the others. There are some diesel engines that approach and may exceed 50% efficiency which is really good as compared to all the rest.
And actually there are diesel engines that had carburetors on them.
I worked on one many years ago.
And this is exactly the same type of tractor I worked on.
And actually there are diesel engines that had carburetors on them.
I worked on one many years ago.
And this is exactly the same type of tractor I worked on.
Last edited by dicer; 04-26-17 at 06:21 PM.
#50
Lexus Champion
iTrader: (3)
If you want economy diesel is the way to go. Higher heat value of the fuel, less pumping losses and greater expansion area, all mean more efficiency. And as far as mineral fuel burning engines go, diesel engines beat all the others. There are some diesel engines that approach and may exceed 50% efficiency which is really good as compared to all the rest.
And actually there are diesel engines that had carburetors on them.
I worked on one many years ago.
And this is exactly the same type of tractor I worked on.
https://www.youtube.com/watch?v=8j-NipO28pk
And actually there are diesel engines that had carburetors on them.
I worked on one many years ago.
And this is exactly the same type of tractor I worked on.
https://www.youtube.com/watch?v=8j-NipO28pk
Last edited by Och; 04-26-17 at 08:11 PM.
#51
Sorry but that tractor is NOT a 2 stroke, and it is true diesel with a carburetor. All diesel engines can run on other fuels, and some can burn straight automotive gasoline as well. And of course as a diesel fuel was injected. Oh and there was an induction throttled diesel as well, I'll leave it at that.
#52
Lexus Champion
iTrader: (3)
Sorry but that tractor is NOT a 2 stroke, and it is true diesel with a carburetor. All diesel engines can run on other fuels, and some can burn straight automotive gasoline as well. And of course as a diesel fuel was injected. Oh and there was an induction throttled diesel as well, I'll leave it at that.
#53
Same engine no starting engine the carb is mounted on the engine so technically is it carbureted. And besides there are truly carbureted diesel engines.
As long as the definition of diesel engine is an internal combustion piston engine that will due to high cylinder air pressure ignite and burn diesel fuel. ???
As long as the definition of diesel engine is an internal combustion piston engine that will due to high cylinder air pressure ignite and burn diesel fuel. ???
#54
Lexus Champion
iTrader: (3)
Same engine no starting engine the carb is mounted on the engine so technically is it carbureted. And besides there are truly carbureted diesel engines.
As long as the definition of diesel engine is an internal combustion piston engine that will due to high cylinder air pressure ignite and burn diesel fuel. ???
As long as the definition of diesel engine is an internal combustion piston engine that will due to high cylinder air pressure ignite and burn diesel fuel. ???
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