Date: Fri, 29 Apr 2016 17:04:15 +0000
Reply-To: Jim Felder <jim.felder@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jim Felder <jim.felder@GMAIL.COM>
Subject: Re: Friday: New VW Engine--it's Miller (cycle) time
In-Reply-To: <CAPm0uf+Sk1ac6m9g_vG0VNayQvwrcPtndj+v0LCvOA=dqi4G4g@mail.gmail.com>
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I saw that to and attributed it to a typo. If not, it would appear in a lot
bigger news outlets than Gizmag.
Jim
On Fri, Apr 29, 2016 at 11:58 AM Brent Weide <brent.weide@gmail.com> wrote:
> I may not be reading it properly but does that really claim 235 mpg??
>
> On Fri, Apr 29, 2016 at 9:40 AM, David McNeely <davmcneely40@gmail.com>
> wrote:
>
> > The Mazda engine could never meet emissions standards, and was dropped,
> > iirc. True of their earlier rotary engine as well.
> >
> > On Fri, Apr 29, 2016 at 9:01 AM, Alistair Bel <albell@shaw.ca> wrote:
> >
> > > VW , where our heads are firmly buried in the sand.
> > >
> > >
> > >
> >
> http://www.theguardian.com/environment/2016/apr/28/vw-and-shell-try-to-block-eu-push-for-cleaner-cars
> > >
> > >
> > > And didn't Mazda sell a Miller cycle engine in a couple of models way
> > back
> > > in the nineties?
> > >
> > > Alistair
> > >
> > >
> > >
> > > > On Apr 29, 2016, at 8:39 AM, Jim Felder <jim.felder@GMAIL.COM>
> wrote:
> > > >
> > > > From Gizmag.com today:
> > > >
> > > > Manufacturers are leaving no stone unturned in the quest to improve
> the
> > > > efficiency of their internal combustion engines. Just this week,
> we've
> > > seen
> > > > a fastidiously engineered diesel engine
> > > > <http://www.gizmag.com/ford-ecoblue-diesel-engine/43016/> from Ford
> > > > and a camless
> > > > engine <http://www.gizmag.com/qoros-qamfree-camless-engine/43045/>
> > from
> > > > Qoros. Now Volkswagen, no stranger to doing whatever it takes to
> lower
> > > > consumption (figures), has joined the party by releasing a 1.5-liter
> > > Miller
> > > > Cycle <
> > > http://www.gizmag.com/audi-high-efficiency-two-liter-engine/37428/>
> > > > engine
> > > > tasked with improving fuel consumption and increasing low-down
> torque.
> > > >
> > > > Volkswagen's engineers say there are a number of improvements that
> come
> > > > courtesy of the improved thermodynamic efficiency associated with
> > Miller
> > > > Cycle engines. An increase in the geometric compression ratio has,
> > > > according to VW, allowed for improved efficiency in the load range
> most
> > > > customers will actually use, while the final compression temperature
> > has
> > > > been lowered through early closing of the intake valve and the
> > expansion
> > > > cooling that brings.
> > > >
> > > > Thanks to these improvements, VW claims its new engine offers up peak
> > > > torque from just 1,300 rpm, while also improving fuel economy by 1
> > l/100
> > > km
> > > > (235 US MPG) compared to the current 1.5-liter TSI engine.
> > > >
> > > > Working tandem with these big changes to the combustion cycle are a
> > > number
> > > > of small changes that, when combined, contribute to the longevity and
> > > > efficiency of the engine. On the 110 kW (148 hp) version of the
> engine,
> > > the
> > > > cylinder liners are coated with an atmospheric plasma spray to cut
> down
> > > on
> > > > friction, improve heat dissipation and improve corrosion resistance.
> > > >
> > > > The engine's cooling system has also come under the microscope, and
> now
> > > > will make sure the water in the crankcase and engine remains
> stationary
> > > > while the car is warming up. As well as cutting the amount of time
> > spent
> > > > without the engine operating at ideal temperature, VW says the system
> > > helps
> > > > warm the cabin more quickly on cold mornings.
> > > >
> > > > Although it's usually used on high end, big displacement engines, VW
> > has
> > > > even fitted cylinder deactivation to the new engine, allowing it to
> run
> > > as
> > > > a two-cylinder under light loads.
> > > >
> > > > An increasing injection pressure 350 bar has improved the mixture
> > > formation
> > > > in the engine, which should also lead to lower particulate emissions.
> > > >
> > > > Interestingly, the release makes it very clear the efficiency and
> > > emissions
> > > > improvements are unlikely to show up under test cycle conditions, but
> > > > argues that they're likely to have a "distinct impact on the
> customer's
> > > > everyday driving."
> > > >
> > > > The new four-cylinder engine will find its way into showrooms later
> > this
> > > > year in 96 kW (129 hp) and 110 kW (148 hp) guises. It's currently on
> > show
> > > > at the Vienna Motor Symposium.
> > >
> >
>
>
>
> --
> Brent Weide
> Portland, Oregon
> www.weidefamily.net/vanagon/
>
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