youtube: Skyactiv explained
 

fuel at 3000psi?


maybe he meant 300?

Eh, the only thing I learned was the transmission's torque converter/clutch system. Which isn't terribly interesting.

I'd like to know more about how they actually achieved 40mpg. I'm not sure 14:1 compression, really good bearings, and a spiffy transmission add up to a 40mpg 2 liter.

I know it shuts the engine off at a stop and uses a compression cycle to start it again, which is awesome, but I'm not sure it's idle has anything to do with it's mpg rating.

Edit: Oh, yeah, the fuel thing sounds scary. I wouldn't be surprised if it was 3000psi. I'm assuming that's one pump at the tank, and one at the engine actually delivering the 3000psi. To safely deliver 3000psi of fuel all the way from the tank would probably go against their weight savings philosophy. Those would be some beefy lines.

My research shows 3k.

Curly my friend in a civic.. she stops her engine on every light.. pushes 39mpg city.

I feel like fuel rails being at 3000psi is cause for concern.

As far as i have found theres a fuel pump in the tank and another one right before the fuel rail and from there on its 3k psi.

injectors spray fuel funny and pistons are designed for it:


this video does flow rating at the end at 5bar (72psi) so unsure what they look like at 3000 :)


https://www.miataturbo.net/attachmen...ine=1340040874

https://www.miataturbo.net/attachmen...ine=1340040874

https://www.miataturbo.net/attachmen...ine=1340040874

It's not. Modern diesels run almost 10 times that much rail pressure (30k psi).

Those are some interesting pistons.

I want one of those blue CX-5 diesel girl-SUVs so bad it's embarassing. Part of me wants that more than a truck and trailer.

I do this at some longer lights, and the outrageously long wait at the local Starbucks drive-thru. My problem is I have an OEM battery from 2007, and you know those starter motors on 4 cylinders that sound like they could start a giant V12? Mine is not one of them.

This is a 2008 Lancer, I average 27-29 a tank, which is up around it's highway rating, so I'm happy. I do wish I had a system that turned it off for me though.

I've considered trading in for a CX-5, but ever since buying the Lancer I promised myself I wouldn't buy another brand new car. But my main concern is I'd walk out with a 235hp AWD ralliart instead of a fuel saver. Even with the skyavtiv, I'd only be saving $16 a month in gas over my current DD, and adding around $290 a month, if I wanted to pay it off at the same time.

I only wish I had waited a couple years to get a new DD. There's a lot of 35mpg+ vehicles available now.

Personally i like the Honda CR Z

https://www.miataturbo.net/attachmen...ine=1340042014

I'll stick with the c30.

I wish Mazda would battle against Audi at leMans.

Mazda needs to bring something else than the MZR-R to the (A)LMS

lol at mazda competing against a company that makes motors with more than 90bhp

HHmm ever notice the car color thing on google?

no, thats neat though.

They are running the 2.2 SkyACTIVE!!!oneone diesel in LMP-2 next year as an engine supplier, not a chassis.

I'd like to see Mazda convert America to Diesel, its clearly the way to go. I'd also like to see the RX-? get something better than rotary...like a diesel.

you mean an ls7 right?

https://www.miataturbo.net/attachmen...ine=1340040874

Mazda can just not get enough use of the smiley face design concept...

You mean this;
http://www.thedieseldriver.com/wp-co...a_CX-5_055.jpg

I went ahead and bought one. Diesel, 4x4 and I chose the auto. The 2000KG towing capacity will come in handy. (When I get it that is... September delivery FML...)

Yeah, I want that.

What are you towing?

Direct injection has to overcome compression.

My 2012 Cummins ran at 22k-24kpsi, and had a shim to relieve pressure after that.

I put in a thicker shim to raise the cutoff pressure to match the added boost. Now I see 26k-28k psi

Hopefully I will be towing a dedicated track miata sooner than later...
Keeping things street legal over here is a pain and when a appropriately sized daily is comfortable, can tow AND get good milage I see no reason to keep it that way.

Until then I`m not really towing anything. Maybe my boat once every second year... (Small boat)

It would be pretty awesome to be able to pull with that CX-5. I wonder if the trans can take the abuse? If I could get away with that I'd totally run to the dealer and finance one.

Cue the "you need a BNSF train to tow a Miata" crew

I did calcs on this somewhere. You save gas by turning off the car any time you're going to be stopped more than 3 seconds. At least I do on my megasquirted miata.

This is why BMW puts that feature in their cars. It's roughly as effective as sucking off the EPA test certifier.

I looked at the CX5 gas version when I was car shopping. I don't want a diesel for various reasons.

Ultimately a loaded CX5 with manual trans and AWD was not significantly cheaper than the way-more-baller MINI Countryman I got. Plus it was uglier. Plus I had to spend 5 minutes in a Mazda dealership and extract about 15 salesmens' hands from my pockets when I left. Dirty.

is the diesel coming to NA? google fails to help me... would gladly look at that for a robust wifeymobile (in AWD though for snow)

Brother in law got a white CX5. I drove it, needs more power. but it was brandy new and I wasn't going to beat on it. The steering wheel was nice.

I have a new class 3 hitch for it in my garage.

I'm personally waiting for the new 2L ecoboost Escapes to show up at the local Ford dealerships.

That's gotta be the happiest piston I've ever seen

A couple of months ago one of the local dealerships brought two CX-5s to a club meet. They seemed pretty well appointed for $22K cars. I think the sales guy said AWD was a $1K upgrade. The sales guy and one other guy who had one on loan both said it feels pretty gutless on acceleration, and these are people who are used to driving bone stock Miatas, so, yeah......

The Mazdaspeed 3/6 with the 2.3 DISI run something like 1800 psi fuel pressure and have been doing so for 6-7 years now. There's a regular pump that sends fuel from the tank, and a second high pressure fuel pump that's driven mechanically by a camshaft. The high pressure pump internals are typically upgraded before trying to make significantly more than stock power, and the injector seals are another possible failure point. I didn't pull the engine cover or otherwise poke around the CX-5 to see if it had a similar cam driven high pressure pump, but I did notice there's a ton of room between the engine and the firewall.

The pic Brain posted is an upgraded/revised piston for the 2.3 DISI.

This is the Skyactiv gasoline piston:
https://www.miataturbo.net/attachmen...ine=1340055846

Skyactiv diesel piston:
https://www.miataturbo.net/attachmen...ine=1340055846

i think the piston i posted was actually a weisco.

Yes. What I wasn't clear on was whether Wiseco's design (or CP's design that Wiseco produces) is the exact same as the revised Mazda version, or has a more extreme profile. Doesn't matter to me since I'll never build a DISI motor, I just ran across it while researching whether I should even consider a MS6 for a daily.

FWIW: The MZR-Turbo uses an electric lifter pump in the fuel tank and a cam driven booster pump to increase the pressure for direct injection, which is around 2 - 3kpsi. If the dealer has to service the fuel system in any way, if possible they'll pull the fuel pump relay and start the vehicle to run it out of fuel in the system, then they can crack open the high pressure side.

I had a TSB on my MS6 for the high pressure fuel pump and watched the guy replace it.


Y8s, you think that fugly mini thing looks better than a CX5?? :facepalm: Sorry bro, that thing is one of the worst looking german vehicles I've ever seen.

i pity the fool that doesn't realize this and tries to pull an injector.

what you havent taken 3,000psi worth of fuel to the fingers/face?

you haven't lived

That. Would. Suck. lol

I just watched the video finally.

So basically, DaveColeman took some of his banned LeMons technology and stuffed it under the hood of the 3. I get it.


Seriously though, am I seeing the basic components of a stratified charge setup similar to the old hondas of yore? Little bowl in piston to make tiny combustion volume, multiple squirts per cycle, high atomization, dinky undersquare bore...

more here:
http://www.motoiq.com/magazine_artic...echnology.aspx

+1 CVCC lives again. There is nothing new under the sun.

Your options were an awesome looking, small SUV or the ugliest pug-nose car on the market, lol. The Mini is also nowhere near reliable.

Am I being a brand------ or is Mazda about to explode with market share and should I run to a broker and start buying shares? The only problem with the newest generation of Mazda cars is that I can't work on them in my garage because they are way too high tech for my child's brain. I really think that 2.2 turbo diesel is going to change cars permanently for us. This hit me when I was watching leMans, engine technology is going to new places and diesel is the way. I expect Mazda to crush LMP2 next year.

Well...the diesel may change cars if the EPA doesn't get involved.

The standard medical treatment for accidental subcutaneous injection of fuel to the arm or hand is amputation in roughly 50% of cases.

Where is the V6 CX-9 diesel that I can easily tow my track car with? Compete with the Explorer, and crush it.

so far it's great. i have a warranty. and in spite of realiability, the resale on the mini is about double the mazda.

bad news for you on that front. the part of the WHO called "The International Agency for Research on Cancer" just reclassified diesel emissions as carcinogenic. like 2nd hand smoke.

http://www.latimes.com/news/science/...,7726895.story

The GOP can write the wrongs of the WHO.

Alarmist garbage. If the International Agency for Research on Cancer is "the world’s most prestigious cancer research group" as asserted, how is it that I have been an oncology researcher for 13 years and never heard of them until now? Granted, I'm not on the environmental epidemiology side of things, but I do read and "world's most prestigious" is more than stretching it. From what I can tell they are neither a major regulatory agency nor a funding agency, so their findings are of limited impact.

Their list of "Category 1 (confirmed) carcinogens" also includes birth control pills, which do in fact increase cancer risk, yet millions of women are allowed to swallow this horrendous poison to murder babies every day! Don't ever go outside without slathering yourself in SPF 90 because UV radiation is also on their list. Also, ethanol. Sonofabitch, it looks like I have to stop drinking beer. We're not just talking about a little cirrhosis here. It's CANCER.

There's some pretty nasty ---- in Category 1 though. High risk but obscure chemicals, some radioisotopes, etc. That it took so long for them to reach a conclusion regarding diesel particulates, which are ubiquitous and inhaled at low levels by a few hundred million people, is a good indicator that it's not that hazardous for the population at large. They relied entirely on one study of heavily exposed miners who were breathing diesel soot in confined underground spaces 40 hours a week for 5+ years. The IARC glosses over that little detail and the L.A. Times ignored it completely while insinuating that the general public should be concerned about truck exhaust as they cruise down the highway. Absolute garbage.

Dear mt.net,

everything causes cancer. humans ARE cancer.

Love, Brain.

I find it kinda funny: after reading this thread at work yesterday I stop by our shop on the way home and my dad has a 2007 Mazda3 with an engine that just "stopped working" after like 50k of regular driving.

We've still no idea why it just up and died, but a compression test pretty much says its toast.

I leased a 2012 Mazda 3 Skyactiv I Touring for my wife. Overall we can't complain. Great fuel economy. Transmission shifts fast and smooth. Fuel economy is on the money. Drives nice and handles really good. Its a little cramped up front for me but perfect for her. I also find the cloth seats about as comfortable as a medieval torture device on long drives. Its a bit gutless from a stop, but not too terrible once its moving. Overall its a great little commuter car. Best of all the lease and insurance is cheap, so piece of mind for me since she doesnt have to drive a used car.

She wants the CX-5 now so will probably pick that up once the lease is up or do an early swap depending on the terms.

I don't doubt that for a second. I just heard/read it. And I'm sure someone else did too. And I'm sure they will call the EPA and ruin Hustler's plans for a diesel CX-5.

I know there was research into some developing countries with respect to the GRADE of diesel they use having much worse particulate and other emissions and the vehicles have little to no emissions controls anyway.

Good chance I will trade my 2012 golf tdi for a 2014 mazda skydrive tdi.

^^^ My father bought a 2012 Passat TDI with the DSG. He sees upper-40s highway mpg which is significantly better than its EPA rating.

ECU is telling me 41.2 mpg over 6k miles. Waiting till the ECU is cracked so I can chip and straight pipe from the dpf.

Didn't do dsg because they cost a butt load to fix and you have to pay $500 more to chip the auto and it really don't work well =/

...and this is why I sold mine at 55k. It's not exactly a package designed for longevity, especially running 21-22 psi as I was.

Also, I'm not sure while so many of you are getting your panties in a twist over 3000 psi of fuel pressure. As others have stated, it's been done in the diesel world for decades now and is also very common in modern direct injection engines. My 'Speed 3 would run at 1600-1800 psi under boost ... they use a mechanical pump off the block to bump pressure so only a foot or so of hard line is actually seeing 3000 psi. I assume the line off the tank is seeing 'standards' fuel pressures.

-Zach

Skyactive diesel, 14.0:1 compression, aluminium block

noticed the comments early on about the di pressures -
the speed 3/6 cx7 used di back in 07 - those engines idled at about 1k psi and did sustained 1700-1900 at wot -
modded hpfp would let you keep close to 2k at wot

I has it! :party:
Feels much more like a normal gas engine and does not fall flat on its face at 3k rpm like all the euro diesels do. Trying to treat it nice since it`s new and all but it revs easily to 5k and I can imagine this being a fun engine in a smaller RWD car than my AWD CX-5. (Allthough I`d rather have a gas turbo myself)

Are the old RX-7 Fd3s twins as nice and compact as this?
https://www.miataturbo.net/attachmen...ine=1359113804

Video:

Wow. I personally would prefer a simpler single-turbo setup, but it sounds like the powerband characteristics are spectacular.

Hope we get them here.

Man that will be a pain in the arse to replace, that turbo is at the back near the firewall.

Diesel has always been the way to go, always!!!
Look at every other market in the world, the USofA is the only place where they are frowned upon...wonder why?

If Mazda does not put this in a CX5, then they are truly stupid. I would buy an AWD model with the diesel instantaneously.