Sport Today

     Did anyone see this "Beyond 2000" show about a week ago that
featured this 2-cycle engined car?  I think it was called an Echo
or something like that.  Anyway, they've done some outstanding work
on the fuel injection system and they compared the present day fuel
injection with the fuel injection that they have now.  The present
day EFI sprays a mist into the intake manifold before the cylinder
as normal.  Their fuel injection injects a gas vapor directly into
the cylinder.  Their "air sniffer" was showing extremely low exhaust
pollutants from the exhaust.  

Geez, I wish that I could remember the name of that thing.  I'm
pretty sure it was being done in California and presently, it's
in the works to be manufactured.  But it's just in the early stages
of getting that all worked out yet.  There were a couple of prototypes
already built though.

Mark Zimmerman, Indy 650, Central Wisconsin

While it has not made it into cars - seems like a good idea for
snowmobiles (whoops snow machines out here).

Terry Dobie
Hailey, ID

Michael

Scott Dowdall
Indy 600SS

: Is all present-day fuel injection done at the intake manifold?  On
: 4-cycle engines, this would be before the intake valve.  (I was really
: surprised when I helped my 16-yr-old son change an injector on his '77
: 280Z, and saw how the injector just connected to the intake manifold).

I have read several articles, some from rec.auto.tech and some from
magazines, that have talked about some very recent technology that
allows cost efficient injection into the cylinders. I don't know why
this is any different than diesel technology, but I think the main
problem has been injecting under the high pressure required by a two
stroke. On a two stroke with no valves, I think the fuel needs to be
injected after the exhaust ports close.

: Is there any fuel injection system that works like diesel
: engines--injecting directly into the cylinder at the top of the
: compression stroke?

Most of the major auto makers and several other companies have been
working on this over the last several years. I think it was either
Snow Week or American Snowmobiler that described about four
different aproaches that are in the R&D stages at different
companies. These were all two stokes, I don't know about four
stroke engines, or understand why it would be any problem.

: Last question, why is fuel injection more fuel-efficient than
: carburetor-fuel systems (where does the fuel get wasted)?  It seems
: like metering fuel through a carburetor wouldn't be too much different
: than injecting into the intake manifold.

I think the main difference is that it is just easier to change the
duty cycle on the injectors than to change the fuel flow thru fixed
jets in real time. Before fuel injection took over there were many
carberated vehicles that had some way to change the fuel flow to
compensate for elevation.

: : Is there any fuel injection system that works like diesel
: : engines--injecting directly into the cylinder at the top of the
: : compression stroke?

     This was the type of injection that was featured on the
television show.  So apparently, somebody is working on it.

: : Last question, why is fuel injection more fuel-efficient than
: : carburetor-fuel systems (where does the fuel get wasted)?

     Fuel injection works better because it is injected under
pressure from an injector nozzle that has a spray pattern (100 psi
sometimes) making for a more atomized fuel vapor than where a regular
carb pulls the fuel in from having airflow past some sort of tube, etc.
And with E.F.I., you can start and stop your fuel flow whenever you
program it to do so.  Not just when the vacuum is high enough to pull it
from the carb as in regular carburetion.

Mark Zimmerman, Indy 650, Central Wisconsin

On a related note, does anybody have any news about Yamaha's new "smokeless"
 2-cycle oil? I thought that I had heard that it would be coming out soon
 (at a high cost, however). Wondering if this type of oil is less polluting
 or what?

Anybody know anything about this?
Andy, '85 Excell III