Engine Theory & Discussion
June-22nd-2002, 08:08 AM
#31
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Yeah there is several differnt acronyms for the same thing. If you look on the pass side of the intake manifold, you will see 2 gold looking small canisters, those are the accuators that open up different parts of the intake manifold at different RPM's.
June-26th-2002, 04:04 PM
#32
Demands Perfection
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Join Date: Jan 2002
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Another Point!
I was thinking the other day about compression ratios and how it might have something to do with engine longevity/reliability-- Some have suggested that the higher compression ratios in Toyota and Honda engines means they won't last as long.
One thing we should consider, though, is that Diesel engines sport much higher compression ratios than standard gasoline engines (Diesel from 14:1 to as high as 25:1; gasoline 8:1 up to 12:1), yet Diesel engines are known to be longer lasting than gasoline. That would suggest that the compression ratio in a car doesn't really have much to do with longevity...
Just a thought!
In any event, I can't wait to see how the new MZR's will perform! Mazda badly needs to bring in newer technology.
One thing we should consider, though, is that Diesel engines sport much higher compression ratios than standard gasoline engines (Diesel from 14:1 to as high as 25:1; gasoline 8:1 up to 12:1), yet Diesel engines are known to be longer lasting than gasoline. That would suggest that the compression ratio in a car doesn't really have much to do with longevity...
Just a thought!
In any event, I can't wait to see how the new MZR's will perform! Mazda badly needs to bring in newer technology.
June-26th-2002, 09:02 PM
#33
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Ummmm. Diesels kind of need high compression to live. Thats what happens when you ignite fuel using pressure. Anyway, the diesel is one of the most low tech and simplest engines on the planet. They don't get as pumped up on technology as their gasoline counterparts since they are already very efficient to begin with. Helps their longevity there. What I don't understand is why more manufacturers don't offer diesel engines. Have to go to VW if you want one in a compact.
June-27th-2002, 12:39 AM
#34
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If you think diesels aren't high tech, you haven't been watching the industry. They are seriously getting high tech now to try to meet ridiculous emissions standards. They are already 'clean' but the EPA wants zero emissions from them.
June-27th-2002, 03:23 PM
#36
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Re: Re: Another Point!
Originally posted by mito7878
Gas is a much more expolsive fuel giving more power per quantity the Diesel. Why arent more "fast" cars running Diesel? this is why you cant compare. I thought that too and wondered it the compression in diesel engines is so high then why cant I use pistons and crankcase for a gasoline engine. Answer Gasoline is more explosive. In other words the rate of burn for gas is quicker and yielding more expansive forces then diesel.
Gas is a much more expolsive fuel giving more power per quantity the Diesel. Why arent more "fast" cars running Diesel? this is why you cant compare. I thought that too and wondered it the compression in diesel engines is so high then why cant I use pistons and crankcase for a gasoline engine. Answer Gasoline is more explosive. In other words the rate of burn for gas is quicker and yielding more expansive forces then diesel.
June-27th-2002, 03:59 PM
#37
Demands Perfection
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Join Date: Jan 2002
Posts: 344
Diesel Characteristics
Actually, Diesel fuel has a higher energy density than gasoline (for all of you science enthusiasts, 155x10^6 joules compared to 132x10^6 joules), and it also has a high boiling point (higher combustion temperature)-- In fact, Diesel fuel boils at a higher temperature than water! These qualities mean that it takes less diesel to travel the same distance than gasoline; hence diesel's better fuel economy.
Regarding why they're not typically used in fast cars, Diesel engines are heavier than gasoline, and they can't produce the same high RPM levels (due the high compression), which makes them more of a torque strong engine rather than brute horsepower. As most of us know, we get our real horsepower in the the high RPM ranges, and if you can't get up in the high range in the first place (as Diesel engines work), you're sol!
In any event, despite being much more sophisitcated than they used to be, Diesel engines are still less complicated than gasoline-- Take out an ignition system and things get a lot less complex!
Check out this link if you want an excellent explanation of diesel vs. gasoline...
Back to the original point of this thread: Mazda needs better engines!!
Regarding why they're not typically used in fast cars, Diesel engines are heavier than gasoline, and they can't produce the same high RPM levels (due the high compression), which makes them more of a torque strong engine rather than brute horsepower. As most of us know, we get our real horsepower in the the high RPM ranges, and if you can't get up in the high range in the first place (as Diesel engines work), you're sol!
In any event, despite being much more sophisitcated than they used to be, Diesel engines are still less complicated than gasoline-- Take out an ignition system and things get a lot less complex!
Check out this link if you want an excellent explanation of diesel vs. gasoline...
Back to the original point of this thread: Mazda needs better engines!!
June-27th-2002, 04:33 PM
#38
Get in my belly!!!
Join Date: Jun 2002
Location: FL
Posts: 362
Re: Diesel Characteristics
Originally posted by ProtegeMaster
Actually, Diesel fuel has a higher energy density than gasoline (for all of you science enthusiasts, 155x10^6 joules compared to 132x10^6 joules), and it also has a high boiling point (higher combustion temperature)-- In fact, Diesel fuel boils at a higher temperature than water! These qualities mean that it takes less diesel to travel the same distance than gasoline; hence diesel's better fuel economy.
Regarding why they're not typically used in fast cars, Diesel engines are heavier than gasoline, and they can't produce the same high RPM levels (due the high compression), which makes them more of a torque strong engine rather than brute horsepower. As most of us know, we get our real horsepower in the the high RPM ranges, and if you can't get up in the high range in the first place (as Diesel engines work), you're sol!
In any event, despite being much more sophisitcated than they used to be, Diesel engines are still less complicated than gasoline-- Take out an ignition system and things get a lot less complex!
Check out this link if you want an excellent explanation of diesel vs. gasoline...
Back to the original point of this thread: Mazda needs better engines!!
Actually, Diesel fuel has a higher energy density than gasoline (for all of you science enthusiasts, 155x10^6 joules compared to 132x10^6 joules), and it also has a high boiling point (higher combustion temperature)-- In fact, Diesel fuel boils at a higher temperature than water! These qualities mean that it takes less diesel to travel the same distance than gasoline; hence diesel's better fuel economy.
Regarding why they're not typically used in fast cars, Diesel engines are heavier than gasoline, and they can't produce the same high RPM levels (due the high compression), which makes them more of a torque strong engine rather than brute horsepower. As most of us know, we get our real horsepower in the the high RPM ranges, and if you can't get up in the high range in the first place (as Diesel engines work), you're sol!
In any event, despite being much more sophisitcated than they used to be, Diesel engines are still less complicated than gasoline-- Take out an ignition system and things get a lot less complex!
Check out this link if you want an excellent explanation of diesel vs. gasoline...
Back to the original point of this thread: Mazda needs better engines!!
July-3rd-2002, 05:31 PM
#39
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Re: Another Point!
Originally posted by ProtegeMaster
One thing we should consider, though, is that Diesel engines sport much higher compression ratios than standard gasoline engines (Diesel from 14:1 to as high as 25:1; gasoline 8:1 up to 12:1), yet Diesel engines are known to be longer lasting than gasoline. That would suggest that the compression ratio in a car doesn't really have much to do with longevity...
Just a thought!
One thing we should consider, though, is that Diesel engines sport much higher compression ratios than standard gasoline engines (Diesel from 14:1 to as high as 25:1; gasoline 8:1 up to 12:1), yet Diesel engines are known to be longer lasting than gasoline. That would suggest that the compression ratio in a car doesn't really have much to do with longevity...
Just a thought!
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