Hey Paul,

 Would the oil injection hole just happen to be in the right spot, in
  relation to the rotor cycle phase, to serve as a good spot to
install a
  fuel injector for direct injection of fuel into the combustion
chamber?
   Is that spot subject to high temperatures?

 If the injector was located there could the fuel be injected close
 enough to the leading edge of the combustion chamber to mix well with
 the incoming air charge?  It wouldn't be good if all the fuel was
 concentrated at the trailing edge of the combustion chamber.

   Mark LaPierre

 Most direct injection attempts have shown no advantage.
 Best to put the injectors at the start of the runner so the
 fuel has time to evaporate.

 Perhaps with much higher pressure injectors on the order
 of 1000 psi.

 Those holes are  great for monitoring the actual  manifold pressure.
 They give a consistent number regardless of the typ of
 intake manifold used. If everybody used those holes
 it would be much easier to tune Tracy's EFI.

 Paul Lamar
 --

    The pictures of the direct injected Mazdas show the injector right
on
top.
   Murry


True but nobody other than Mazda has driven one yet.
The picture on the web site is of a prototype.

We also don't know the timing or pressure of the injection.
Obviously the pressure in that chamber is rapidly increasing.

Everybody is welcome to try but you will need a lot
more pressure than 50 psi. Note there are no direct injection
gasoline engines on the market at this time as far as I know.
Porsche among many others have done a lot of research on the
subject spending millions.


Paul Lamar



Paul,
Audi, VW Chevrolet, and Ford all have DI gas engines now. There are
probably
others, Hyundai probably, all report improved power and mileage. These
are
true DI systems injecting near TDC. This requires a pump with around 18k
psi.
Bill Jepson



Are they really doing better than the average Honda or Toyota econo box?
http://www.fueleconomy.gov/feg/bestworst.shtml

I have removed the diesels and electrics from this chart.
Diesels don't pay off that much as the price of diesel fuel is higher
by as much as 15% to 20%. Electrics because they don't sell.
The stupid range extender Volt is a failure as I predicated.

Which of these are DFI?


http://www.ford.com/cars/fiesta/features/

The Fiesta is not. It is all about rolling resistance, transmission and
aero
drag. What I have been saying for years.

"When equipped with the SFE Package, the Fiesta SE hatch and sedan can
get up to

40 hwy mpg.2 The SFE Package has cruise control, a spoiler and 15-inch
steel
wheels, plus aerodynamic features that help minimize air resistance
such as side

air deflectors, underbody shields and blockers on the lower grille."


Paul Lamar

Paul,
I believe all the eco boost Fords are DI. I could be wrong on that but
many of the
2011 models are DI. Hyundai Sonata, Kia Sorento, Audis 2011 gas line is
mostly
DI. They call it FSI and it is on A4s A6s and A8s 3.2L 6cyl, 3.0 Turbo,
4.2L V8.
More and more cars are using Direct Injection. Some of this is sure to
be because
of emissions of course, but power and economy is also claimed to be
improved.
Many of the VW line are DI since Audi owns them that is to be expected.
Most
carmakers are at least testing it, including Mazda on their Skytech
engine for hybrids.
Bill Jepson
--


The 2012 Ford Tarus with ecoboost not out yet. Only 25 MPG highway.
The RX8 will do that.

The  quasi van Flex ecoboost is only 21 MPG highway.

Where is the beef? :)

Paul Lamar