03-25-2012, 08:55 PM | #43 |
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Just a guess, but I'm guessing the displacement increase to 1.6L in the 16X was to decrease the surface area/volume ratio. They also modified the geometry to improve combustion chamber surface area/volume ratio, and increase compression ratio (to a modest 10:1 or something). However the combustion chamber still has a huge surface area compared to a piston engine, which doesn't bode well for low rpm efficiency, but they'll need to try to run it at lower rpm to get acceptable fuel economy due to the high displacement.
Their fuel efficiency in the Renesis was something like 30% worse than a comparable piston engine, peak BSFC falls short something like 10-20% or so, and at max power we can see that the combustion efficiency is still bad enough to cause over 25% efficiency loss compared to a piston engine, so if they can close the gap to 10% under normal driving circumstances that would be nothing short of a miracle. Good luck to them. The rotary is way too cool to just throw away IMO. |
03-25-2012, 09:29 PM | #44 |
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I hope mazda comes out with a high mpg 240hp 2+2 coupe that looks like the rx7...
and nissan debuts the s16 naturally aspirated inline 4 producing 240hp as well... both coming in at 2900 lbs ish wet
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03-25-2012, 09:38 PM | #45 |
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03-25-2012, 09:41 PM | #46 |
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I just hope they solve the flooding issues...
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03-25-2012, 09:47 PM | #47 |
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Well it's not actually that hard to do, but the market is kinda iffy imo. If he meant rotary, then probably not, you'll probably see rotaries restricted to high power applications for the reason I just described.
As for Nissan, 240hp NA isn't that hard to hit but Nissan hasn't built a potent low displacement engine I think. If it's cheap, it won't be V6. Tuned VQ25 could probably hit 240hp, dunno. |
03-25-2012, 10:06 PM | #48 |
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03-25-2012, 11:56 PM | #49 |
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I like the sound of this.
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03-26-2012, 10:57 AM | #50 | |
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Quote:
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03-26-2012, 11:40 AM | #51 |
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What is the world avg. Mpg standards for about 2014 to 2016 cause i highly doubt 27 avg would pass @@ i might be wrong though
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03-26-2012, 01:43 PM | #52 |
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Don't know world average, don't think there is one. There's CAFE here and I'm not sure if Euro 5/6 regulations are emissions and mileage, or just emissions.
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03-26-2012, 07:25 PM | #53 | |
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Now the little overlap is bad for power, but one of those electric turbo systems could nicely take care of the problem and give efficiency improvements, albeit at higher cost. But we're talking >400hp anyways :P |
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03-26-2012, 07:45 PM | #54 | |
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They are un-nervingly smooth, and can probably be tuned to be very efficient at a narrow rpm, and just spin there until the battery's charged.
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03-26-2012, 08:03 PM | #55 | |
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Oh right, does anyone have any idea how the friction of a rotary compares to a piston engine? Rotaries have inherently less friction in the design, but I remember reading that because of sealing considerations they have more? friction. |
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03-26-2012, 08:08 PM | #56 | |
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5k with a good muffler would probably be fine.
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