Does anyone have some insight into the future of the beloved ring-ding? I really love mine and don't want to give them up yet. Are they really as bad for the environment as they tree-huggers say they are? I was told that the factories are dictating the change because they don't want to make two different types of engines anymore. Is this indeed true? Weighing the pros and cons of 2 and 4 strokes always brings me back to the 2 stroke. Am I on an island on this or are there others out there who agree with me? I still think that mixing fuel is easier than valve adjusting and whatever else is involved with keeping a thumper happy. What is the general consensus?
Future of Two Strokes
- Thread starter gascanuck
- Start date
tm_enduro
New member
Much of the motorcycle industry seems to have given up on 2T's, but 2T's are alive and well in the snowmobile industry. You will be hard pressed to find a 4T snowmobile on the trails around here, and the one you do find will have $5K plus in turbo and performance parts, and will weigh 100 or more pounds than the other sleds on the trail / mountain.
Given that 4-strokes cost at least a grand more than two strokes, adding the EFI shouldn't price them out of reach. Then again, I have heard garden variety four stroke EFI won't work on a two stroke. Because a two stroke needs fuel injected on the compression stroke, you need a much higher pressure system than you do on a four stroke that gets injected on the intake stroke. I am tempted to get a two stroke and if they were injected, it would really push me over the edge.
Greg
skid jackson
New member
Skid doo makes a semi direct injection sled thats a two stroke. It also has some fancy injection on it's evinrude 2t boat motors. The epa gave it an award for clean burning technology on the evinrude motors. Less pollution than 4t boat motors. Seems to me that the technology is there
I don't understand why , with all this positive 2t information, that 2t's in general seem to have gotten a bad rap as of late. One really has to wonder exactly what is going on with the manufacturers as well as the buying public. Does the old saying money talks, b.s. walks still come into effect? With this whole 4t influx, there must be literally thousands of 2t bikes out there and all of them at decent prices. Who, in their right mind wouldn't want to pick up one then? From an environmental aspect, it seems the jury is still out on the so-called negative effects of a 2t. I know things here in Canada and especially here in Manitoba, the MX racers are now starting to turn back to 2t's for ease of manitenance. What I want to know is, is noise pollution more of an issue over exhaust pollution? Here in Canada, the restrictions are a little more relaxed than the U.S. but noise seems to be a way bigger issue over emissions. It seems the braaap is more appealing than roarrrr.
TooFastTim
New member
I can't remember where I saw it but some people have a TM 250 2T motor running with FI.
skid jackson
New member
4T noise is a big issue here in the states. No honda 125 2t's state side either. Don't think they are shipping the 250's either but not 100% sure on that. I believe you can still get yz 250 2t's. The woods racers in my area love the yz.
Here's some great info on Direct injected two stroke engines.
http://www.orbeng.com.au/orbital/flash_index.htm
http://www.orbeng.com.au/orbital/flash_index.htm
TooFastTim
New member
Looks like Aprillia have it right: http://www.speed-sports.com/motorscooters/scooter_models/aprilia_scooters/ditech.html
We discussed the 2T fuel injection stuff on the smackover forum a while ago and Jim was saying that one of his mates (who works for a snow mobile co) had converted his KTM200 to fuel injection based on the snowmobile injectors and mapping/software.
Apparently the bike is running well with no issues.
It would be awesome to just dial in the jetting.
And it would in my opinion make a strong sales point for a 2T, both being more "green" but also provide more miles per gallon.
Might be lighter as well, but not sure on that one.
The company that introduces the first model and get approval for street legal use in the states, is going to be counting a lot of money as it is still the preferred bike for a lot of racing dudes, especially when the going gets tuff.
So hurry up GG
Cheers
Kim
Apparently the bike is running well with no issues.
It would be awesome to just dial in the jetting.
And it would in my opinion make a strong sales point for a 2T, both being more "green" but also provide more miles per gallon.
Might be lighter as well, but not sure on that one.
The company that introduces the first model and get approval for street legal use in the states, is going to be counting a lot of money as it is still the preferred bike for a lot of racing dudes, especially when the going gets tuff.
So hurry up GG
Cheers
Kim
d2w
New member
Not trying to hijack this thread from a discussion of future two strokes, but I remember reading about a (Colorado-based, I think) company working on electro- or pneumatic-actuated valves for four-strokes. Basically, no timing chain or cams. Combine that with fuel-injection and you'd have a totally programable engine system. Now throw in Windows to control it all and you're screwed (as you'd have to reboot your motorcycle every 20 miles) ;-)
TooFastTim
New member
Seems like you could just inject into the case during the compression stroke. With a fast blast, you could probably get a bigger charge than with reed valves.
Using the crank case injection version, you would have to fire the injector on the down stroke of the piston.
The mixture will then be forced up thru the transfer ports to the combustion chamber.
The reed valves prevent the fuel mixture from blowing back into the intake when the piston is traveling downwards.
The mixture will then be forced up thru the transfer ports to the combustion chamber.
The reed valves prevent the fuel mixture from blowing back into the intake when the piston is traveling downwards.
