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


 Mazdaspeed3 engine uses DISI; Direct Injection Spark Ignition. The regular
Mazda3 has port injection. On the new Skyactive technology they use the DI to
cool the intake air to help control detonation. I expect that is why they use
it on the turbo engine. For aircraft use, the injector just behind the
throttle plate is as Paul has stated, the best for better vapourization of the
fuel. Part of the exhaust emissions is fuel that is still in droplet form
during the burn. Only the surface combusts and the rest goes out the exhaust.

Dale Davies

Getting back to reality here is where we put them for best BSFC.

Paul Lamar