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#4492254 - 08/18/17 07:42 PM Will Mazda HCCI tech be the end of car diesels?
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California

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#4492267 - 08/18/17 08:12 PM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
pbm Offline


Registered: 04/19/04
Posts: 7600
Loc: New York
Mazda is an engineering giant, IMO....I was disappointed that Ford sold their share back to Mazda because I liked Ford having access to their engineering.
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#4492268 - 08/18/17 08:13 PM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
PimTac Offline


Registered: 03/04/17
Posts: 4285
Loc: Soviet State of Washington
Hard to say at this time. If the engine does get that extra fuel economy they predict plus being reliable, then chances are very good. A 30% gain in fuel economy is nothing to sneeze at.
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#4492309 - 08/18/17 09:10 PM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
Reddy45 Offline


Registered: 08/15/08
Posts: 2968
Loc: USA
No. It has its place but a compromise is always a compromise...

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#4492343 - 08/18/17 09:53 PM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
rooflessVW Offline


Registered: 12/24/11
Posts: 4046
Loc: North Carolina
Will it replace diesels in passenger cars? Probably. Diesel is dead in that regard.

In HD trucks? No way.
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#4492420 - 08/18/17 11:32 PM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
HondaRULZ Offline


Registered: 06/12/17
Posts: 81
Loc: Honda land
I still do not hear anyone asking "What do you drive"..guess that's coming up?

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#4492470 - 08/19/17 12:44 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California

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#4492482 - 08/19/17 01:30 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: HondaRULZ]
PimTac Offline


Registered: 03/04/17
Posts: 4285
Loc: Soviet State of Washington
Originally Posted By: HondaRULZ
I still do not hear anyone asking "What do you drive"..guess that's coming up?



Does it matter? The Mazda SkyActiv HCCI is a pretty good advance for the internal combustion engine. If they can take a 30mpg engine and get almost 40mpg with this technology, then why not? Mazda SkyActiv engines have very good reliability compared to some other manufacturers that have had issues. There is an active thread on BITOG on the Ford EcoBoost 2.7's that are having problems. The new Honda 1.5 TGDI engine has fuel dilution issues.

This new engine of Mazda will also be going into some Toyota cars in the upcoming future now that Mazda and Toyota are linked together.
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#4492490 - 08/19/17 02:08 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
Shannow Online   content


Registered: 12/12/02
Posts: 39858
Loc: 'Stralia
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4437582/Re:_42___efficient_IC_engine_o

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#4492509 - 08/19/17 04:07 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
skyactiv Offline


Registered: 03/02/13
Posts: 4395
Loc: The Midwest
I'm going to guess these engines will NOT have the lifespan of traditional spark ignited gas engines and wont tolerate
much leakdown loss before needing overhauled. This will truly be an engine will the oil used will matter for long term longevity.
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#4492523 - 08/19/17 06:17 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: skyactiv]
4WD Offline


Registered: 09/21/10
Posts: 6369
Loc: Texas
Think mean time between rebuilds was a downside of some company's rotary engines ...

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#4492542 - 08/19/17 06:58 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
Eddie Offline


Registered: 12/07/03
Posts: 9563
Loc: Florida, Cape Coral
I am a Mazda fan and presently drive a SkyActiv CX5, However; I remember the Mazda Diesel and the teething issues it has and, maybe till has had for years. I do hope Mazda doesn't push this HCCI out to the public too quick and loose their fan base. Ed
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#4492560 - 08/19/17 07:30 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
LoneRanger Offline


Registered: 07/02/07
Posts: 4058
Loc: Midwest USA
HCCI/electric hybrids could attain some serious fuel economy while putting out decent power levels, not to mention ultra low emissions. 75 mpg?
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#4492580 - 08/19/17 07:59 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
Scdevon Offline


Registered: 09/07/09
Posts: 325
Loc: Rockies
I'd be surprised if it lives up to the hype. I can see even the loss of a few percentage points of compression being a real problem on this engine.
Wouldn't the pistons / ring lands have to be at least as tough as a true Diesel to survive in what is essentially a compression ignition gasoline engine? We're talking some heavy internal parts for a "gas" engine.

Mazda has gotten better since they've started to build "normal" piston engine cars in recent decades, but they've had some real engineering flops.
If you like rotary engines, then fine. Hardly anyone else does like them though and they were real POS's in the 70's.


Edited by Scdevon (08/19/17 08:02 AM)
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#4492589 - 08/19/17 08:07 AM Re: Will Mazda HCCI tech be the end of car diesels? [Re: OneEyeJack]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
Switzerland just announced it will no longer register any more Porsche Cayennes with the diesel motor. This is a direct result of the diesel emissions scandal.

Germany has said that the diesel motor's days are numbered.

France and the UK have said that the internal combustion motor's days are numbered, and you can bet the first type to die will be diesel passenger car motors.

Diesel passenger cars have barely began to get traction in North America before being eyed suspiciously by regulators.

The Mazda motor won't help matters, but it's just another nail in the coffin.
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