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Mazda is predicting about 188 horsepower and 170 lb-ft of torque from the 2.0-liter Skyactiv-X. Today’s 2.0-liter Skyactiv-G engine, as fitted to the 3, makes 155 horsepower and 150 lb-ft of torque, putting the X on a similar plane as the uplevel 3’s 184-hp 2.5-liter four. Mazda further claims the X will be up to 30 percent more efficient than the smaller Skyactiv-G. We’ll try to confirm those claims when we eventually test a production-spec Skyactiv-X in about two years when the next-gen 3 reaches dealerships.



2019 Mazda 3 with Skyactiv-X Compression-Ignition Gas Engine Prototype Drive | Review | Car and Driver
 

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Just read that article. C/D pointed out one negative stating that engine knock could be detected when switching between spark plug and compression ignition. The knock can last up to one second and, because of the parameters, there isn't much that can be done about it. Mazda is trying to design some noise dampening around the block to minimize the noise and claims that the knocking isn't a wear issue. Maybe it's just me, but I thought that knock of any kind was bad on an engine if not remedied.
 

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I think this 2.0L 188 HP engine will be the sole engine in the next generation 6.
Why would they make a 230-240 HP 2.5L version of this? That would eliminate the need for the 2.5L Turbo of the CX-9, yeah after 2 model years.
 

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I think this 2.0L 188 HP engine will be the sole engine in the next generation 6.
Why would they make a 230-240 HP 2.5L version of this? That would eliminate the need for the 2.5L Turbo of the CX-9, yeah after 2 model years.
Conversely, why would the use the same engine in the top-model 6 that is also in the base model 3? Especially when there are already complaints about lack of power? Mazda will need to offer something in the 6 other than the HCCI 2.0L if they want to continue selling it here or else it's going to crash and burn.
 

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The 2017 Mazda6 has a 2.5L 184HP engine right?
and so does mazda3?? damn..didn't even know...makes the mazda6 have a weak engine
 

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The current Mazda3 comes standard with a 2.0L Skyactiv-G engine with 155 hp. The upcoming Skyactiv-X 2.0L will have 188 hp.

I wouldn't be surprised if a 1.5L version of the new engine with 155-160 hp comes standard with the 2019 Mazda3.
 

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Road & Track talked to a couple of the engineers at the LA Auto Show regarding the upcoming SkyActiv X engine. The good news is that the engine is compatible with the existing manual transmission. One other interesting aspect of the article is their continued insistence that the turbo and the SkyActiv X engines are NOT meant to be performance minded motors. I think that's just more evidence that a MazdaSpeed derivative isn't in our future.
 

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For those who are interested, here's a good technical overview of the Skyactiv-X engine design. The author is not affiliated with Mazda, but I find he does a good job of covering automotive engineering topics:

 
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