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FUEL INJECTION MODIFICATION


Gulfstream1
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http://www.envirofit.org/?q=our-products/2-stroke-retrofit

Retro Fit Direct Injection for two stroke engines.

Snow mobiles have direct injection on some of there 2 strokers.

I contacted them about 18 months ago and they said that it will not be generally available for at least a few years as it is mainly for really congested two stroke countrys ie Asia area.

thios is the way to go but the cost of doing on a small scale is toooooooo expensive.

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Not being very technically minded -what's the advantage of fuel injection? :shock:

Tj

More power

Less fuel

No carb to have to set up and alter

No choke

No expansion box

And you could have it so as when you are cruising it only fires every other rotation (same as the four stroke)so you would get great economy then

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and no carb icing issues.

I can't see how FI removes the need for the expansion chamber. Can you explain.

Im no writer but I can talk a lot :D

With a normal two stroke due to the design a certain amount of fuel/air flows straight through in to the exhaust after it pushes the burnt fuel mix out of the combustion chamber.

http://science.howstuffworks.com/two-stroke2.htm

The expantion box is designed to send a shock wave back up the pipe to force this wasted fuel mix back in to the combustion chamber

http://science.howstuffworks.com/framed ... pipes.html

with fuel injection the fuel is injected in to the compressed air after the piston has closed the ports so no fuel is wasted.

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and no carb icing issues.

I can't see how FI removes the need for the expansion chamber. Can you explain.

Im no writer but I can talk a lot :D

With a normal two stroke due to the design a certain amount of fuel/air flows straight through in to the exhaust after it pushes the burnt fuel mix out of the combustion chamber.

http://science.howstuffworks.com/two-stroke2.htm

The expantion box is designed to send a shock wave back up the pipe to force this wasted fuel mix back in to the combustion chamber

http://science.howstuffworks.com/framed ... pipes.html

with fuel injection the fuel is injected in to the compressed air after the piston has closed the ports so no fuel is wasted.

just to add to what Pete has said, you also get a much more accurate fuel / air mix wich also enhances economy.

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Aha, went back and looked properly at the original link. Hadn't realised that the injection was into the head and not a straight carb replacement. Couldn't see how you could eliminate the expansion chamber if the injection was in crab replacement form to the crankcase and then via transfer port to the cylinder. I guess then that is what the 'direct' part means.

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I don't understand why it is so difficult, chip controlled injector directly into the cylinder head. Drill big hole, tap thread, bolt in suitable injector.

I do know the direct diesel injectors are expensive.

How long before we can see a 4 stroke TURBO... or even an electric supercharger, I know they are about for cars.

I looked a building a diesel trike a while back. Needed a variable pitch prop due to limited rev range and got to complicated to take it off the drawing board.

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I don't understand why it is so difficult, chip controlled injector directly into the cylinder head. Drill big hole, tap thread, bolt in suitable injector.

I do know the direct diesel injectors are expensive.

How long before we can see a 4 stroke TURBO... or even an electric supercharger, I know they are about for cars.

I looked a building a diesel trike a while back. Needed a variable pitch prop due to limited rev range and got to complicated to take it off the drawing board.

Read your last line and you have answered your own question

its a lot more than a chip controlled injector directly into the cylinder head. Drill big hole, tap thread, bolt in suitable injector.

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