Mazda announces 70mpg gasoline-engine (not a diesel) Mazda2 in 2011.

that's roughly 58mpg. cool

 

I hope the reports prove to be true .... but let's not forget GM's 230 mpg claim.
Having previously owned a Mazda Rx-7 .... and feeling that was a most amazing vehicle, I would love to see Mazda pull off a major victory.

 

That may be under Japanese test cycle. Prius gets 94 MPG for reference. That's pretty good for a non-hybrid that size. Any word on horsepower and acceleration numbers?

 

I wonder how that japanese test translates to American?

The engine seems to be quite a good one, although ford has said when it uses the engine it will use 13:1 compression instead to use regular gasoline.

It would be really cool to see a prius's hsd with an atkinson version of that engine in a mazda 2.

Here is some more details about the engine (assume the 1.4L is the same tech as the 2) and transmission from car and driver.

Mazda Engine News: Mazda Sky Gas and Diesel Details

 

hp is 163 for a 2L version. If it scales it should be just over 110hp for the 1.4L.
How do they do that Japanese test? Thanks for the comparison number so around epa 37mpg. car and driver said the mazda 3 burning premium with a 2 liter version would get 30 city 39 highway.

 

14:1 compression ratio is remarkable, as the whole reason Toyota went with Atkinson cycle for the Prius engine was to be able to use 13:1 expansion ratio. This engine should be even more efficient, close to diesel efficiency!

 

The EFFECTIVE compression ratio of the Prius ICE is only 10:1. Base/native CR is 13:1 but after using the delayed intake valve closing technique duirng the compression stroke the EFFECTIVE CR is back in the range for the use of regular fuel, ~10:1.

Should the Prius ICE be adapted to DFI those numbers could change to 15:1 and 12:1 respectively.

Note that Mazda doesn't say that this isn't some form of Atkinson, or even Miller, engine. In which case 14:1 would be substandard.

 

DFI I gather.
We have been reading about it for years. Kudos to Mazda for getting it to market, but price and reliability are outstanding questions.

 

I owned a Mazda RX-2, RX-4 and Rotary Pick-up and loved all of them. That was back when they were having some issues with the apex seals. I just read that Audi is now coming out with a Hybrid using lithium batteries and a single rotor rotary engine. It is claimed to be even smoother than the Mazda two rotor rotary engine.

 

Porsche has been installing DFI engines in the 911/997 and the Cayenne for 2-3 years already, and now the new Panamera too. VW is following Porsche's lead. Holden in AU seems to have DFI pretty much across the product line.

I suspect DFI will soon get a couple of throttle body fuel injectors to be used only if the throttle is not at WOT or nearby. There seems to be a problem with PCV (and maybe EGR) residue depositing and congealing on the backside of the intake valves.

That would also help to clean up the PCV/EGR residue deposited throughout the intake manifold even on SFI engines.

 

I laughed when I read this part. The reporter's tone is that hybrid technology is bad and to be avoided. Like: "we are trying to maintain kidney function without resorting to transplant surgery".

 

Hi All,

If like USBseawolf said, the Prius gets 94 mpg on the Japanese cycle, and 50 on the US EPA City/Hwy combined, then this car gets something like 37.5 (= 70 * 50/94)mpg combined US EPA. Not bad, but not Prius class. Part of that is slower speeds. Another part is the Imperial gallon being 1.2 times the size of the US gallon.

 

let me guess - imperial gallons.