What happened to the envirofit envirokit?
 

Just wondering, this seemed like a novel idea and supposedly they were going ahead with conversions but...

2-Stroke Retrofit Technology - Field Testing | Envirofit - Making the World Fit for Humanity

Nothing happened.

Any ideas if a method of getting fuel injection on a 2 cycle exists? (aka one that doesn't involve blowing through the port into the exhaust like the carb does anyway)

I notice some scooters already have a system like this, I wonder if I could locate a junker of a similar motor style to mine, drill and tap a few holes in the head and get a 2 cycle DI setup? Maybe too optimistic.

Ah well
Ryan

DI would take a bit of work and a high-pressure injection system. Remember, if it's DI, you're injecting into an already high pressure atmosphere while the cylinder is up.

You could set up a single cylinder EFI system that didn't inject fuel until (x)ms before the exhaust port was covered, thereby only letting fresh air flow out the exhaust. You've still got the oil issue, though, which I suppose can be made up for with synthetic/low E oils.

I saw a video on Youtube that they uploaded, and I think they were able to retrofit a few hundred or maybe a thousand or two bikes in Malaysia or something. No idea what happened after that.

They had a fuel pump, a replacement head with the injector, and probably some sort of replacement oiling system.

Ideally you'd have a separate supercharger ish thing rather than using the crankcase to pump air too, and at the expense of a small amount of pumping loss you can greatly diminish the importance of exhaust tuning. Two strokes have a lot of potential...I think I've seen somewhere that piston ring wear due to the uncovering and covering of ports is an issue for reliability as far as adapting them to cars goes however :/ Emissions control is obviously quite a bit tougher too, although using a timed exhaust valve would help.

They trialled this in the Philippines. Think they hit their targets and closed shop, since all new utility motorbikes here must be, by law, four-stroke.

Supposedly this kit was $250, I believe the same type of kit could be used on any oil injected 2 cycle, you would just need to drill and tap a hole in a safe location in each head, remove the carb and leave the oil injector.

Timing a 2 cycle is simple as it gets, the ports and exhaust should be tuned as is for the motor the spark, o2 and injection timing would be left but again would be simple.

My main interest was the 30-40% increase in economy, not the oil issue.

Too bad a kit like this does not exist, I could see many uses for one.

Cheers
Ryan

DI kit
 

You can try contacting Envirofit at envirofit dot org
but I don't think they will sell you a kit because they are
not approved for the US. I don't think they would have
any problem getting them approved, but there would be
no purpose in that as far as Envirofit is concerned.
I think they have abandoned that project and now are
concentrating on a new one, supplying highly efficient
wood and biomass burning cookstoves for undeveloped
areas of the World where indoor pollution is causing millions
of deaths and illness.
You might try buying one of the kits from the Philippines.
A taxi, or "tricycle" owner might sell one that is no longer
being used. They save a lot of gas and oil with the kits.
I think all the parts are off-the-shelf, but finding them may
be very difficult.
Orbital Corporation in Australia provides the low-pressure
technology used in the DI kits. It uses compressed air to
inject fuel into the combustion chamber after the ports are
closed.
Most of the air in the cylinder comes through the crank
case, as in a normal two-stroke, and the oil also goes into
the crank case.
You might try orbeng dot com dot au to try to get
some information. I think you would be able to modify a
head. The kits are made for Yamaha RS100 motorcycles
as well as a Kawasaki 125 and a Suzuki 100, all from the
seventies and eighties as far as the U.S. is concerned.
I have a 1975 RS100 and would have liked to have gotten
one of the kits. Instead, the bike has been converted to
LPG fuel.
Let me know what you find out about possibly buying one
of the kits.
I hope you can make out those addresses. I don't have
enough posts to allow urls.

That was the first thing I tried, they won't respond.

Invennovations.com - Categories > Emissions Reduction

Very sad that the best products never go to the us?

All that witch-hunting against 2-stroke engines is really dumb. Then can be made more efficient, and way cleaner at the long run if we take into account some factors like incorrect disposal of waste motor oil, which would be reduced with 2-stroke engines.

The original Dodge Neon was going to be a DI 2 cycle but because of the witch hunt against lean burn and Nox it got shelved at the last moment.

The car got tremendously better fuel economy as a DI 2 cycle but due to NoX it was shelved.

Dodge might have been viewed here in a better light had that design been produced but lean idle and midrange were considered defects and not celebrated,

Too bad really. Imagine all of the Dodge Neons on the road getting 10mpg better and weighing 100lbs less?

I believe it.
The very large low speed 2-stroke diesel engines used in ocean going ships use the most thermodynamicly efficient engines in the world.

I guess we are lucky to still have diesel engines since we seem to have an abondance of idiots that only seem worried about what comes out the tail pipe of the vehicle and nothing beyond that.

There are lots of those idiots everywhere. I know one who I had a few arguments with while used to brag about the supposed lower environmental impact of hybrids, but recently bought a Renault Clio II Campus (still available brand-new in Brazil). At least it can run on ethanol, while the currently-available hybrids usually can't :D

Anyway, we can't really neglect the effect of some tailpipe emissions, but there is also some huge energy expenses that come from industrial processes to refine petroleum, or to make chemicals like DEF, and also the logistics involved to make it available to the final customer.

I have an Aprilia SR50 that is actually a direct injected 2 stroke. It has a fuel injector that injects straight fuel into the head and there is an air injector in front of the fuel injector. There is an air pump that run off a cam on the crankshaft for the air injector. Oil is injected to the intake manifold right before the reed valves. Its a great system but I would love to find a way to get into the factory ecu and make changes to get more performance out of it.

Aftermarket support for direct-injection 2-stroke gassers has not been so strong. Well, the same system featured in Aprilia and Piaggio motorcycles is also used in many outboard motors, but I didn't even find any tuning device compatible with that application.

I always find it interesting when I read articles about Chrysler group doing research and development on things.

If they did all of this research and development ... howcome in the 90s and 00s they made pure garbage?

If they did make a two stroke DI neon ... the car would still fall apart in 50K miles.

There was a "Gameboy" cartridge that could tune Aprilia DI systems, you will need to search around a while, there is one place in the US that tunes these from an Motocross perspecitve.

Search around and you should be able to find it.

An interesting setup was recently introduced by KTM but, surprisingly, featuring port-injection instead of DI. Not sure if that would allow lean-burn in the same proportion, but seems more suitable to overcome the NOx issue.
KTM FI Two-Stroke Info: The Scoop on TPI (Transfer Port Injection) - Dirt Bike Test

TBI on a 2 cycle just adds power, fuel still can escape out the exhaust.

The funny part is my old neglected Subaru 360 that is carb'd goes lean at cruze and injects oil as needed can pass emissions.

It's harmonically tuned on intake and exhaust maximizing torque and minimizing fuel lost out the exhaust.

But it doesn't really rev past 7000 rpms, enforces economy over power

Even though 7000 RPM is quite high for a car engine, they usually operate at a narrower revving band compared to motorcycles, which might allow to improvements on torque and minimizing fuel loss.

A 2 cylinder 360 CC car engine needs all the revs it can get

Lean Cruze is around 5000rpm

Power band is quite narrow

Those who TBI the car can push 9000rpms and usually loose economy but gain a lot of power.

It's quite complicated to balance everything in order to improve the overall efficiency, there is always some compromise. No wonder nowadays, even with all the resources such as VVT available for 4-stroke engines, manufacturers are putting some effort into transmissions with a higher amount of gears and the CVTs.