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Larger displacement Atkinson cycle engines may be in the future for Toyota

A number of automotive manufacturers have begun to move away from larger displacement naturally aspirated engines to smaller displacement turbocharged engines. The general idea was that smaller and lighter engines would use less fuel while offering the same sort of performance thanks to the addition of a turbocharger. However, in the real world many drivers have discovered that turbocharged small displacement engines are often unable to deliver on their fuel efficiency claims.

Toyota is considering bucking the industry trend and rather than going with smaller turbocharged engines, is considering larger naturally aspirated engines to improve fuel efficiency. Senior managing officer in charge of drivetrain R&D for Toyota Koei Saga recently said that Toyota believes gasoline engines could benefit more from upsizing capacity in conjunction with Atkinson combustion cycles than going smaller with turbochargers.
 
Atkinson engines today are typically only used in hybrid vehicles like the Prius, Ford Fusion Hybrid, Hyundai Sonata Hybrid, and Honda Accord Hybrid.


Toyota Camry
 
Increasing the displacement of an engine using the Atkinson cycle would deliver a specific output less than that of similarly sized conventional combustion cycle engines, but fuel economy would be better. Toyota believes that fuel economy would be better than the smaller engines they replace.
 
Toyota has offered no timeframe for bringing larger displacement Atkinson cycle engines to market and hasn't hinted at which models might get the Atkinson cycle engines.
 
Mazda experimented with similar “delayed valve” Miller Cycle technology over a decade ago in the Millenia midsize sedan. But instead of using electric motors to make up for the reduced power density like today’s Atkinson-engine hybrid vehicles, the Millenia used a supercharger.
 
Saga also talked a bit about the next generation Toyota Prius saying that the vehicle will use a mixture of battery technology including lithium-ion and nickel batteries. The reason for mixing battery types is that lithium-ion batteries are better for performance, but the durability and lifespan is better for nickel batteries. 

Source: Green Car Reports



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RE: According to whom?
By FITCamaro on 10/16/2013 10:26:54 AM , Rating: 2
I have a 2013 Altima SV now and yes the fuel economy is quite good. I average 38 on the freeway as advertised and average around 35 in my daily commute.

I really like the way the fusion looks but yeah the fuel economy wasn't as good. I think that's because of weight though.

The Altima is 3182-3230 lbs for the 2.5L models.
The Fusion is around 3615 lbs. They don't have individual curb weights listed for particular models.


RE: According to whom?
By Brandon Hill (blog) on 10/16/2013 10:31:33 AM , Rating: 2
I hope I'm not getting you mixed up with Reclaimer (I think that he's the Subaru nut), but you seem to have gone through a lot of cars in the past few years ;)

IIRC, you've had a Cobalt SS, a GTO, the Cruze, and now an Altima in the span of maybe 3 or 4 years?


RE: According to whom?
By Monkey's Uncle on 10/16/2013 11:18:55 AM , Rating: 2
Perhaps he works in a car dealer?


RE: According to whom?
By SilthDraeth on 10/16/2013 11:33:24 AM , Rating: 2
"In a car dealer"

lol


RE: According to whom?
By syslog2000 on 10/16/2013 11:54:49 AM , Rating: 2
Lol! Busted! Fitcamaro, you better have a good excuse ;)


RE: According to whom?
By Brandon Hill (blog) on 10/16/2013 12:02:57 PM , Rating: 2
I wasn't trying to "bust" him. As a car guy, I just notice things like that when they are mentioned.


RE: According to whom?
By FITCamaro on 10/16/2013 1:33:40 PM , Rating: 2
In 8 years I've had 4 cars:

2005-2008 Cobalt SS 2.4L 5M
2008-2012 GTO 6M
2012-2013 Cruze Eco 6M
2013 Altima

Cruze was only replaced because of a semi backing into it.


RE: According to whom?
By Brandon Hill (blog) on 10/16/2013 1:39:55 PM , Rating: 2
OK, I got ya. I caught on at the tail end of your Cobalt days and then the mishap with the semi skewed things a bit.

Sorry to hear about your Cruze though :(


RE: According to whom?
By FITCamaro on 10/16/2013 2:52:12 PM , Rating: 2
I've been on this site since 2002 I think when I had an 87 IROC. Then was an 89 Camaro RS/Z28 clone with nothing stock.


RE: According to whom?
By Jeffk464 on 10/16/2013 5:24:25 PM , Rating: 2
quote:
replaced because of a semi backing into it

Yeah, thats pretty easy to do.


RE: According to whom?
By Reclaimer77 on 10/16/2013 1:44:57 PM , Rating: 2
Sorry Brandon I can barely hear you out here, bad signal. I'm still in line at the dealership personally reserving my spot for the first BRZ STI in my area!!

If you see my girlfriend, tell her I love her, and there's a spot for her in my tent. Also I'm pretty hungry...


RE: According to whom?
By Brandon Hill (blog) on 10/16/2013 1:49:03 PM , Rating: 2
You're hungry? I'll get you a full plate of torque. You're gonna need it ;)

Seriously though, congrats!


RE: According to whom?
By Spuke on 10/16/2013 7:52:09 PM , Rating: 2
quote:
BRZ STI
BRZ STI??? I needs to do some internets searching!


RE: According to whom?
By Brandon Hill (blog) on 10/16/2013 10:10:14 PM , Rating: 2
It's not what you think though (no turbo); it's more of a handling package AFAIK:

http://www.edmunds.com/car-news/subaru-teases-2014...


RE: According to whom?
By Reclaimer77 on 10/17/2013 1:39:26 AM , Rating: 2
Nope. It's already been confirmed. Big power increases.

Come on, you actually believed something would be badged "STI" and NOT be boosted? Tisk tisk :P

http://www.topspeed.com/cars/subaru/2014-subaru-br...


RE: According to whom?
By Spuke on 10/17/2013 3:51:12 PM , Rating: 2
I don't know Rec. Seems to be quite a bit of confusion on the BRZ STi still. Can't seem to get a straight answer anywhere. Guess it's just a wait and see. Even if it does exist, I need to see lap times. Tired of buying overly compromised "sports" cars.


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