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Nissan Motor Company has announced a new type of gasoline engine

reuters.com

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Re: Nissan Motor Company has announced a new type of gasoline engine

#141

Post by semi-extrinsic »

Annatar wrote: post #139
TylerE wrote: post #123

Earlier quoted context omitted.

I seriously doubt their actual levels of quality have gone downhill. Automotive quality has been on an enormous upswing - the WORST cars of today are better than the BEST cars of 25 years ago.

No worries - where there is management, especially middle management, there's always trouble. And at PSA concern, there is a lllooottt of management! NISSAN is nowhere near the ingenuity and quality they were back in the '80's and the '90's, after all, most of the engineering comes from Renault now, and not Japan. And the Japanese get all the low end engineering designs from Renault, while Renault, Peugeot, and Citro…

Oh, Renault cheap car engineering. I'm still wondering who in their right mind designed the oil filter on the K4J engine that's installed upside down, such that (short of flipping the entire car 90° on its front end) there is no way to change oil without spilling half a pint all over the engine block and the floor below.

Re: Nissan Motor Company has announced a new type of gasoline engine

#142

Post by TylerE »

Annatar wrote: post #139
TylerE wrote: post #123

Earlier quoted context omitted.

I seriously doubt their actual levels of quality have gone downhill. Automotive quality has been on an enormous upswing - the WORST cars of today are better than the BEST cars of 25 years ago.

No worries - where there is management, especially middle management, there's always trouble. And at PSA concern, there is a lllooottt of management! NISSAN is nowhere near the ingenuity and quality they were back in the '80's and the '90's, after all, most of the engineering comes from Renault now, and not Japan. And the Japanese get all the low end engineering designs from Renault, while Renault, Peugeot, and Citro…

This is just nonsense. Compare, for a start, what would happen to your 280ZX in, say, a 40mph crash. Now see how the modern 370z would fare.

Things that would have been considered exotic in the late 80s - like turbochargers or 6 speed gearboxes are now commonplace. Features that are now standard weren't even options.

Re: Nissan Motor Company has announced a new type of gasoline engine

#143

Post by asimuvPR »

TylerE wrote: post #142
Annatar wrote: post #139

Earlier quoted context omitted.

No worries - where there is management, especially middle management, there's always trouble. And at PSA concern, there is a lllooottt of management! NISSAN is nowhere near the ingenuity and quality they were back in the '80's and the '90's, after all, most of the engineering comes from Renault now, and not Japan. And the Japanese get all the low end engineering designs from Renault, while Renault, Peugeot, and Citro…

This is just nonsense. Compare, for a start, what would happen to your 280ZX in, say, a 40mph crash. Now see how the modern 370z would fare. Things that would have been considered exotic in the late 80s - like turbochargers or 6 speed gearboxes are now commonplace. Features that are now standard weren't even options.

Crash ratings, equipment, and drivetrain configuration do not have to do with quality. WHen they joined Renault they inherited their mediocre management and engineering.

Re: Nissan Motor Company has announced a new type of gasoline engine

#144

Post by stonewhite »

LoSboccacc wrote: post #72
usrusr wrote: post #70

Earlier quoted context omitted.

So this only reduces inefficiency while the the engine revs too low for the turbo to kick in? Then it is competing with electrically assisted turbocharging (spin the turbo electrically when there is not enough exhaust pressure, basically a super/turbo hybrid using electric transmission), as both are addressing the same inefficiency. I know where I would put my bets in terms of price, reliability and ease of developme…

Which models are coming out with electrically assisted turbos?

Audi SQ7 is coming up with an electrical supercharger and two sequential turbochargers to deliver lagless and variable boost for high performance in all of the rev range.

http://www.caranddriver.com/news/2017-audi-sq7-tdi-diesel-ph...

Re: Nissan Motor Company has announced a new type of gasoline engine

#145

Post by semi-extrinsic »

coredog64 wrote: post #131
shawkinaw wrote: post #11

From the (much better) Reuters article [0]: > The higher the ratio, the more efficiently the engine works, producing better fuel economy and, with the addition of a turbo-charger, more power. > Traditionally, design engineers had to fix a gasoline engine's combustion compression ratio, essentially deciding whether to go for power or economy. Everything gets better with higher compression ratio, so where's the comprom…

Higher compression ratios mean higher temperatures. Higher temperatures means more NOX in the output. As it is cars _already_ have to run richer than stoichiometric in order to keep from melting the catalytic converter. I would expect this will require some extraordinary pollution control measures as well.

There's plenty of ways to get temperatures down. Bigger intercooler, even refrigerated intercooling, water or water-methanol injection in various forms, going to high alcohol content fuels, etc. Even putting a waste heat recovery unit (WHRU) between the manifold and the catalytic converter is doable.

If you want to get really crazy, imagine a WHRU on the manifold in the form of a Rankine cycle where the expander drives a compressor for the air inlet. Like a thermal turbo, if you will, giving you more charge air than NA but with much smaller parasitic power losses than a mechanical turbo.

Re: Nissan Motor Company has announced a new type of gasoline engine

#146

Post by semi-extrinsic »

wepple wrote: post #89
shawkinaw wrote: post #11

From the (much better) Reuters article [0]: > The higher the ratio, the more efficiently the engine works, producing better fuel economy and, with the addition of a turbo-charger, more power. > Traditionally, design engineers had to fix a gasoline engine's combustion compression ratio, essentially deciding whether to go for power or economy. Everything gets better with higher compression ratio, so where's the comprom…

Under certain conditions (high load, warm day), you'll start hearing a 'pinging' sound on high-compression engines; that's the air/fuel mixture pre-igniting before it is supposed to (before the spark fires) essentially turning the engine into a wannabe diesel and ruining performance/efficiency. There are a few other undesirable things about high-compression. And I just read your message about knocking. same thing. Ne…

Modern engines (as in, post 1989) will sense an engine knock (or a misfire) and go into open cycle ECU mode, ignoring the lambda sensor inputs. It'll run really rough and rich in order to avoid any more knocking, which could seriously damage the engine.

Re: Nissan Motor Company has announced a new type of gasoline engine

#147

Post by dogma1138 »

zglennie wrote: post #135
TheSpiceIsLife wrote: post #68

Earlier quoted context omitted.

Never mind, I see now how the mechanism changes the stroke length.

Can you elaborate? I'm trying to figure it out. I'm also confused about where the crankshaft is supposed to be in this picture.

The crankshaft is in the middle part it doesn't move in relation to the head. The image explains is pretty well, the piston is connected to the "multi-link" which changes the angle make the piston head move further into the cylinder.

Re: Nissan Motor Company has announced a new type of gasoline engine

#148

Post by Annatar »

TylerE wrote: post #142
Annatar wrote: post #139

Earlier quoted context omitted.

No worries - where there is management, especially middle management, there's always trouble. And at PSA concern, there is a lllooottt of management! NISSAN is nowhere near the ingenuity and quality they were back in the '80's and the '90's, after all, most of the engineering comes from Renault now, and not Japan. And the Japanese get all the low end engineering designs from Renault, while Renault, Peugeot, and Citro…

This is just nonsense. Compare, for a start, what would happen to your 280ZX in, say, a 40mph crash. Now see how the modern 370z would fare. Things that would have been considered exotic in the late 80s - like turbochargers or 6 speed gearboxes are now commonplace. Features that are now standard weren't even options.

You know how much I care about crash ratings?!? I couldn't care less! I'm comparing performance and design first and foremost.

Compare the iconic NISSAN Skyline GT with a Qashqai NISMO edition, the epitome of garbage NISSAN is pumping out today, and things come into perspective pretty clearly.

One look at 1990's NISSAN Primera and one can see what it meant to be at the cutting edge of aesthetics. One look at any of the NISSAN's today, and one can see what it means to design cars by committee.

Try to find a good looking NISSAN with a diesel engine and a manual transmission today. I dare you!

Re: Nissan Motor Company has announced a new type of gasoline engine

#149

Post by fgonzag »

semi-extrinsic wrote: post #146
wepple wrote: post #89

Earlier quoted context omitted.

Under certain conditions (high load, warm day), you'll start hearing a 'pinging' sound on high-compression engines; that's the air/fuel mixture pre-igniting before it is supposed to (before the spark fires) essentially turning the engine into a wannabe diesel and ruining performance/efficiency. There are a few other undesirable things about high-compression. And I just read your message about knocking. same thing. Ne…

Modern engines (as in, post 1989) will sense an engine knock (or a misfire) and go into open cycle ECU mode, ignoring the lambda sensor inputs. It'll run really rough and rich in order to avoid any more knocking, which could seriously damage the engine.

And to those curious on how it senses it, they literally stick a microphone in the engine calibrated for the ping (knock) frequency.

Re: Nissan Motor Company has announced a new type of gasoline engine

#150

Post by TheSpiceIsLife »

zglennie wrote: post #135
TheSpiceIsLife wrote: post #68

Earlier quoted context omitted.

Never mind, I see now how the mechanism changes the stroke length.

Can you elaborate? I'm trying to figure it out. I'm also confused about where the crankshaft is supposed to be in this picture.

Erm, I'm not sure I get it. I think I'd need to see an animation. If the crankshaft is fixed I don't see how that linkage can change the stroke length because all it shows in that diagram is the piston further along the stroke, which is what all piston engines do when the crankshaft rotates.

So yeah, I probably need to see an animation to grok it.

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