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Old 10-05-2010, 08:00 AM   #11
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I just thought it was a strange concept, just wanted to see what ya'll thought. And your right, they should've sold the idea to someone like Volvo.
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Old 10-05-2010, 08:11 AM   #12
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doesn't surprise me... Mazda brought us that wonderful creation.... The Rotary !!

this seems close to that
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Old 10-05-2010, 09:57 AM   #13
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And who'* capital props up Mazda. Hmmmmmmm, Ford. heheheh.
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Old 10-05-2010, 01:08 PM   #14
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I really don't understand the reasoning of doing this except for a single piston engine application where there aren't other pistons providing the inertia to allow the engine to utilize all the compression possible. And then you have to use a supercharger for it to work? Well then if you have to boost, wouldn't you want to make the most of it? The whole thing smacks of being different for no other reason to be different. Maybe Mazda should have sold the idea to Volvo. They like to do stuff just because.
It doesn't really make sense till you can understand it mapped out on a P-v diagram with the area being work. Same with the diesel cycle.

The key here is pumping loss. It takes energy to compress the air. This alleviates some of this energy input and results in a boost in efficiency. Remember that efficiency doesn't equal power when it comes to mpgs.. at the cost of power, you get mpgs basically.

The compression ratio in a miller cycle engine is not the same as a typical engine. The 2.3l mazda engine is constructed as a 3.0 That .7l loss is a result of the swept volume that isn't compressed. (from intake valve open longer) A high static CR is limited to the intake valve opening timing and IMO much boost is better since you're loosing a third of your dynamic compression ratio to start with. Boost and direct injection is the way to go.

The concept is very sound, works, and used more often than you think. Hybrids use a similar cycle to boost mpgs. They just don't use forced induction.
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Old 10-05-2010, 04:51 PM   #15
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... at the cost of power, you get mpgs basically.
Thats it. Very hard to think inside that box. I guess is you are an engineer satisfying a Government demand or be King of MPG stats it'* a plus. for the other 99% of us
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Old 10-05-2010, 05:22 PM   #16
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Thats it. Very hard to think inside that box. I guess is you are an engineer satisfying a Government demand or be King of MPG stats it'* a plus. for the other 99% of us
Same 'box' as diesels.. Reduce pumping loss at the expense of power..

I don't think 99% of us fall into the group association you're making.

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Old 10-05-2010, 05:40 PM   #17
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Do NOT link other Forums here.
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Old 10-05-2010, 09:12 PM   #18
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Do NOT link other Forums here.
I've definitely seen this not enforced even with myself before. Had I not, I wouldn't have linked.

For the OP and anyone interested, the link was to a non GM forum that talked about a newer 1.3l Mazda engine that used the Atkinson cycle with CVT to make up for the low end torque loss. It also had great info on the Miller and Atkinson cycles.
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Old 10-05-2010, 09:44 PM   #19
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When I saw a new thread called "Miller Cycle" in the Lounge, I was expecting a beer joke.

But let'* see: 60% the displacement of a 3800, 40% better fuel economy (SSEi: 20 mpg, according to Edmunds), with only a 12% loss of horsepower. It'* not designed for performance, but by the numbers, that'* some efficient engineering.

Of course, the Miller engine falls flat on its face when the dealer explains to Joe Sixpack that the fuel-efficient car that will use less gas only runs on expensive gas.

Like a supercharged (Otto) engine, the Miller engine may catch on, but I don't see it becoming anything more than a niche.
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Old 10-05-2010, 10:11 PM   #20
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Do NOT link other Forums here.
Wait... what?

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...but I don't see it becoming anything more than a niche.
And that'* ok, uniqueness is good, usually.
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