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Review of Mazda SkyActiv X #4509466
09/06/17 08:34 PM
09/06/17 08:34 PM
Joined: Mar 2017
Posts: 8,155
...
PimTac Offline OP
PimTac  Offline OP

Joined: Mar 2017
Posts: 8,155
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This is their new HCCI gasoline engine.


http://www.caradvice.com.au/579982/mazda-skyactiv-x-review/


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Re: Review of Mazda SkyActiv X [Re: PimTac] #4509475
09/06/17 08:44 PM
09/06/17 08:44 PM
Joined: Mar 2017
Posts: 8,155
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PimTac Offline OP
PimTac  Offline OP

Joined: Mar 2017
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Re: Review of Mazda SkyActiv X [Re: PimTac] #4509483
09/06/17 08:53 PM
09/06/17 08:53 PM
Joined: Aug 2014
Posts: 635
WA
SnowDrifter Offline
SnowDrifter  Offline

Joined: Aug 2014
Posts: 635
WA
I have to say I'm genuinely impressed they got a functioning prototype. It's one of those technologies I thought would be better suited for something like a generator or gas/electric train where the load is fairly constant. I honestly didn't think they could pull it off in a passenger automobile.


2005 Tahoe - 135k
2003 Forester(the swagger wagon) - Rehomed
1999 Passat - Rehomed
Re: Review of Mazda SkyActiv X [Re: SnowDrifter] #4509641
09/07/17 12:57 AM
09/07/17 12:57 AM
Joined: Mar 2017
Posts: 8,155
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PimTac Offline OP
PimTac  Offline OP

Joined: Mar 2017
Posts: 8,155
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In my reading on the subject, it had been mentioned that the other automakers had dabbled with the idea but they stopped at some point. Perhaps they all came to a certain point in the process and could not get past it. It appears Mazda has come up with the solution.

The engine has a supercharger. Maybe that was the key?


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Re: Review of Mazda SkyActiv X [Re: PimTac] #4509644
09/07/17 01:38 AM
09/07/17 01:38 AM
Joined: Jun 2014
Posts: 1,755
Rijeka, EU
chrisri Offline
chrisri  Offline

Joined: Jun 2014
Posts: 1,755
Rijeka, EU
So everyone forget about Wankel and Mazda's fiasco even with latest and best RX8? If that car had charged four inline it would be brilliant. But no, we have to be different and change engines in the same intervals as cambelts in the 80s.


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Re: Review of Mazda SkyActiv X [Re: PimTac] #4509799
09/07/17 09:26 AM
09/07/17 09:26 AM
Joined: May 2003
Posts: 7,466
Oklahoma
Schmoe Offline
Schmoe  Offline

Joined: May 2003
Posts: 7,466
Oklahoma
got to give them credit for trying....wonder how miles this engine could last.


01 Supercrew Lariat 4X4
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Re: Review of Mazda SkyActiv X [Re: PimTac] #4509852
09/07/17 10:47 AM
09/07/17 10:47 AM
Joined: Sep 2008
Posts: 9,249
Ontario, Canada
IndyIan Offline
IndyIan  Offline

Joined: Sep 2008
Posts: 9,249
Ontario, Canada
I believe F1 engines have been using a similar spark controlled compression ignition system for a few years now, so maybe Mazda poached some engine designers from one of those engine manufacturers? Also I read that Toyota is a shareholder in Mazda now so maybe they are using Mazda to try some new tech without risking their reputation?
I really impressed that they are testing the system with a manual transmission as well, so there is hope for driver oriented cheap cars for a few more years!


07 Focus ZXW, 5spd manual, 230km M1 5W30
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Re: Review of Mazda SkyActiv X [Re: PimTac] #4509950
09/07/17 12:44 PM
09/07/17 12:44 PM
Joined: Aug 2002
Posts: 14,846
Silicon Valley
PandaBear Offline
PandaBear  Offline

Joined: Aug 2002
Posts: 14,846
Silicon Valley
Very impressive is an understatement.

I was always wondering how are they going to precisely control the timing of the ignition in HCCI without using a mechanical plunger, and how quickly they can switch between different ignition timing (or type) mechanically or thermally. Using just spark plug to be able to achieve this is very impressive.


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Review of Mazda SkyActiv X [Re: PandaBear] #4510133
09/07/17 03:53 PM
09/07/17 03:53 PM
Joined: Apr 2008
Posts: 13,185
Central NY
Miller88 Offline
Miller88  Offline

Joined: Apr 2008
Posts: 13,185
Central NY
Originally Posted By: PandaBear
Very impressive is an understatement.

I was always wondering how are they going to precisely control the timing of the ignition in HCCI without using a mechanical plunger, and how quickly they can switch between different ignition timing (or type) mechanically or thermally. Using just spark plug to be able to achieve this is very impressive.


The controlled ping thing is pretty cool. I like it and hope it ends up working out for them! Mazda seems to have a decent job with Skyactiv - I wouldn't say they were an early adopter, but I hope the Skyactiv-X ends up working out for them.

They're definitely trying. And it's available with a manual so the EPA hasn't fully restricted what they can do!


18 Forester 2.5I 6M
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01 F-350 4x4 5M
Re: Review of Mazda SkyActiv X [Re: Miller88] #4510495
09/07/17 10:45 PM
09/07/17 10:45 PM
Joined: Jun 2007
Posts: 462
Near Mobile
ffhdriver Offline
ffhdriver  Offline

Joined: Jun 2007
Posts: 462
Near Mobile
Hope they are smart enough to not have another Wankel type fiasco.

Re: Review of Mazda SkyActiv X [Re: ffhdriver] #4510538
09/08/17 03:29 AM
09/08/17 03:29 AM
Joined: Mar 2017
Posts: 8,155
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PimTac Offline OP
PimTac  Offline OP

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Originally Posted By: ffhdriver
Hope they are smart enough to not have another Wankel type fiasco.



I would like to think that they are smarter now. My opinion is that any Wankel engine would be limited to one model. That's my guess. Consumers shied away from Mazda because the rotary engine pretty much locked them to Mazda. That was one major reason I never considered Mazda in the past for vehicle purchases. The other was Fords involvement. Obviously I'm not a fan of Ford. However, today is different and Mazda is enjoying great success albeit in a small scale compared to the bigger automakers.


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