Mazda 3 skyactiv

[Vince30]

Has anyone seen these yet?

Got a couple in at work, everyone was shitting bricks about it. Did some research, turns out these things are running a 14:1 compression ratio engine to a 6 speed dual clutch trans and still takes 87 octane. I usually do not get excited about much that mazda does but this made me pretty damn impressed. If I was looking for a new cheap eco car, this would be something I would be looking at, so I thought I would share.

[Texas Toast]

I love my speed3. Fun little turbo daily driver. Plus the rear seats fold down so I can haul parts too!

[mrsleeve]

I am really wondering how the fuck they can run 14:1 on even 91-93 unleaded with out pulling a shit ton of timing.

I know I know. chamber and piston design play a big role in keeping the detonation out but even still 14:1 is impressive even on 108 octane race gas with optimum timing.

[tjts1]

Too bad they all fall apart at 60k miles.

I know I know. chamber and piston design play a big role in keeping the detonation out but even still 14:1 is impressive even on 108 octane race gas with optimum timing.

Simple. Its not 14:1. Try 12:1
http://www.mazdausa.com/MusaWeb/disp...ehicleCode=M3S

[Cronopoulos]

40mpg, welcome to 20 years ago...

[mrsleeve]

^

Till the EPA got involved

[CrusherCurtis]

And I hear they get stupid good gas mileage. To bad its a tail dragger. Wouldn't touch it with a 10 foot pole.


edit: just watched the video 40mpg

[Kershaw]

they fall apart at 60k miles? says who? i know plenty of mazda3s with 150k+ running just fine. my rx8 has 80k and it's definitely not falling apart. mazdas are great cars.

i couldnt own a mazda3 though. i've test driven them, and yes the ms3 is pretty damn quick. i just hate the huge dash, the steering, and non-existent clutch feel. 40mpg sounds nice though.

[Mercury[BKM]]

needs more KODO

[Dj Buttchug]

no needs more push and less pull

[Pantless Spency]

no needs more push and less pull

this, i think the mazda3 hatch backs look great, but me no likey motor that pulls me likey push.

[Conki]

How about 60 mpg hwy? 44mpg city? and RWD.

http://www.rpmgo.com/testdrive/2010-bmw-116d

[Galactodactyl]

I am really wondering how the fuck they can run 14:1 on even 91-93 unleaded with out pulling a shit ton of timing.

I know I know. chamber and piston design play a big role in keeping the detonation out but even still 14:1 is impressive even on 108 octane race gas with optimum timing.

I wondered the same honestly.


From Motortrend -

We should talk engine, as the totally rethought Skyactiv-G engine is the second part of the Skyactiv puzzle in the 2012 Mazda3. In its purest, European form, the Skyactiv-G 2.0-liter features an almost impossibly lofty 14:1 compression. How does Mazda achieve this without near-constant knocking and/or black soot shooting out into the atmosphere? Like the new automatic transmission, plenty of good old engineering. Or should I say good new engineering? First, the fuel is delivered into the cylinders via direct injection at 2900 psi. Yes, for a non-diesel, that is quite high. Moreover, the Skyactiv direct injection fires not one, but two blasts of fuel into the cylinder (once during the intake stroke, once during compression) per cycle. The initial squirt of 91 octane cools the cylinder to prevent knock.

Did I say 91 octane? So yeah, over in fancy pants Europe you can get a Skyactiv-G that takes 91 octane. However, here in America, Mazda sees premium fuel as a barrier to sales. Therefore the Mazda3 with Skyactiv-G we get runs on 87 octane. Meaning that Mazda had to lower the compression ratio to 13:1. Er, whoops, that's not true. That's going to be true on the upcoming CX-5 with its trick 4-2-1 exhaust header. But since that header would require altering the Mazda3's firewall, engineers had to use the exhaust system that's already there and lower the compression ratio to 12:1. Now, before you start freaking out, I'd like to point out that the Ferrari 458 Italia also has a 12:1 compression ratio (fine, 12.5:1). Thing is, 12:1 on 87 octane is pretty remarkable. And that's the really cool thing about this whole Skyactiv program -- we ain't seen nothing yet.

Read more: http://www.motortrend.com/roadtests/...#ixzz1biIeDTfq

[z31maniac]

^

Till the EPA got involved

And people showed they didn't want to drive around rattly-tin cans either.

People demand nav, sound deadening, much, much higher crash impact standards, etc.

Yes, the EPA killed Honda's lean burn engines of the 80s, but that's hardly the only reason for current mpg standards.

Or do we have to inject a level of gov't hate into EVERY thread.

[HellzMindPlaya]

I had a speed6 and I loved it... One of the only thing I disliked about it was that if you wanted to make mouch more power with it that you had to upgrade the high-pressure fuel pump, whick is camshaft driven, so it isn't just as easy as installing a bigger intank pump.