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Old 05-02-2012, 10:25 PM   #1 (permalink)
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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

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Old 05-02-2012, 11:37 PM   #2 (permalink)
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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.
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Old 05-03-2012, 02:26 AM   #3 (permalink)
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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.
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Old 05-03-2012, 03:52 AM   #4 (permalink)
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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.
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Old 05-03-2012, 02:10 PM   #5 (permalink)
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Quote:
Originally Posted by niky View Post
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
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Old 05-03-2012, 06:28 PM   #6 (permalink)
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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.
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Old 05-04-2012, 11:12 AM   #7 (permalink)
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Quote:
Originally Posted by genetuck1 View Post
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
That was the first thing I tried, they won't respond.
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Old 03-21-2013, 10:22 PM   #8 (permalink)
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Invennovations.com - Categories > Emissions Reduction

Very sad that the best products never go to the us?
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Old 04-21-2013, 08:38 AM   #9 (permalink)
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Quote:
Originally Posted by niky View Post
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.
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.
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Old 04-21-2013, 01:59 PM   #10 (permalink)
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Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
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?

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