Other MIT proves two stroke is better and cleaner than a 4 stroke

D-Roc

I forgot!
so true eh, lol. 2 strokes have twice the power stroke, we just have to learn to harness the potential of it. thank goodness we have some engine builders in the industry that will work on port timing and displacements and powervalves to give us engines that actually perform waaaaay better than engines that where being run 8-9 years ago. 2 strokes haven't even come close to being maxed out.

edit: sweet audi
 
Location
dfw
Twostrokes and fourstrokes have similar BSFC in their peak efficiency rpm range. Twostrokes need direct injection in order to maintain it below that. The outboard mfgs have been producing direct injected twostrokes for nearly a decade, why is everyone else so slow to embrace the obvious?
 
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the WaTeRhAwK

fryin' up a/m electrics..
Location
okc
so true eh, lol. 2 strokes have twice the power stroke, we just have to learn to harness the potential of it. thank goodness we have some engine builders in the industry that will work on port timing and displacements and powervalves to give us engines that actually perform waaaaay better than engines that where being run 8-9 years ago. 2 strokes haven't even come close to being maxed out.

edit: sweet audi

the x-scream pv's are getting pretty damned close..lol I mean what else you gonna do to one to get it to it's maxed potential? those things are crazy.
 

SXRguyinMA

Life's a beach
Location
Leicester MA
Twostrokes and fourstrokes have similar BSFC in their peak efficiency rpm range. Twostrokes need direct injection in order to maintain it below that. The outboard mfgs have been producing direct injected twostrokes for nearly a decade, why is everyone else so slow to embrace the obvious?

cuz its not cheap. have you seen the price of a 600 e-tec snowmobile? its well over $1k more than everyone elses 600 class sled. almost $2k in some cases. plus they're having recalls left and right, and a few have even set on fire for unknown causes. I'll pass for now
 

Scorn800

Ride for life
Location
North NJ
cuz its not cheap. have you seen the price of a 600 e-tec snowmobile? its well over $1k more than everyone elses 600 class sled. almost $2k in some cases. plus they're having recalls left and right, and a few have even set on fire for unknown causes. I'll pass for now


I own Skidoo 600 etec X. Great sled & gets awesome MPG & oil use. I use less gas than my boys that ride yamaha nitro's. I had 600 sdi X before hand & put 4800mls on it with no problems.
 

D-Roc

I forgot!
i would buy a 600 etec in a second. i have an olympic that i can wrap the cord backwards to reverse it outta the garage. try that on a 4poke.
picture.php
 

the WaTeRhAwK

fryin' up a/m electrics..
Location
okc
still missed it. :p



well, what was the point I missed?


you stated this:

so true eh, lol. 2 strokes have twice the power stroke, we just have to learn to harness the potential of it. thank goodness we have some engine builders in the industry that will work on port timing and displacements and powervalves to give us engines that actually perform waaaaay better than engines that where being run 8-9 years ago. 2 strokes haven't even come close to being maxed out.

edit: sweet audi


I responded with this:


the x-scream pv's are getting pretty damned close..lol I mean what else you gonna do to one to get it to it's maxed potential? those things are crazy.



augustaf throws this in:


Direct injection comes to mind! Not cheap but certainly needed to satisfy EPA in the long run.



just curious where I "missed the point" to asking you what you were getting at with YOUR post, that has absolutely nothing to do with fuel injection. you were referring to the internal machine work of the engine itself when you stated "port timing, displacements, and powervalves".


I'm asking you to elaborate on YOUR comments, not point to someone elses' comment about "fuel injection", as a means to avoid following up with your own comments, which are completely unrelated to the question you are being asked. are you missing the point with my question? or are you just confused about your own comment?






enlighten me, please......
 

rkm

Location
McCall, ID
I finally found my paper, Ill post it up later today.
Seriously two stroke development right now is where four stroke was in the forties.
The reason we havnt seen previous DIs is the injection system itself. Most systems run 150+ psi from the tank to the injectors which is so unsafe in a consumer recreationial vehicle.
The Etec injector is what will change the feasibility of two strokes to the everyday man.
It runs 25 pounds to the injectors, they are electromagnetic controlled to pressurize the fuel inside them, capable up to 20,000 psi.
Ive done the price analysis, ETec is about $400 more per unit than carbs. Plus development cost.
 

D-Roc

I forgot!
who knows what the point is, whatever it is i am sure we will both miss it. but, to elaborate a bit i will say the the x-scream motor you talked about is an amazing motor, i am not sure if they have layed all their cards out on it or if their is more to come. they have done an amazing job with porting a motor that works well for watercraft application. I will also say that it is nothing that hasn't been done already when talking about twin cylinder two stroke engines. snowmobiles have had this stuff for years. to see what the future of our engines would be, all we need to do is look at the outboard engines and the sled engines. that is where i see the future of two strokes going. 90% of people here do not need or want an expensive, high power, high maint, short life BB stroker motor . But i would bet that 90% would be interested in a 600cc 120hp DI motor that will run all day on a cart tank of fuel, use 1/4 of the expensive oil, and last for years and years. When your custom motor has problems you can be down for the entire season. dare to imagine with me if Seadoo made a semi lightweight, flat cornering, wavepopping, sharp turning hull. put adjustable trim to compensate for different rider weights, 600cc di motor with 120hp and can be service 5-10 min. down the road or get parts from the local dealer. now that would be something i am sure alot of us would be interested in. seadoo has everything they need to do it. they also have a marketing scheme of getting out on the water and having fun. this could appeal to all us recreation riders. as long as they don't make it to be a race coarse ski, they could pull it of. IMO of course.
 

smoofers

Rockin' the SQUARE!!!!
Site Supporter
Location
Granbury, TX
who knows what the point is, whatever it is i am sure we will both miss it. but, to elaborate a bit i will say the the x-scream motor you talked about is an amazing motor, i am not sure if they have layed all their cards out on it or if their is more to come. they have done an amazing job with porting a motor that works well for watercraft application. I will also say that it is nothing that hasn't been done already when talking about twin cylinder two stroke engines. snowmobiles have had this stuff for years. to see what the future of our engines would be, all we need to do is look at the outboard engines and the sled engines. that is where i see the future of two strokes going. 90% of people here do not need or want an expensive, high power, high maint, short life BB stroker motor . But i would bet that 90% would be interested in a 600cc 120hp DI motor that will run all day on a cart tank of fuel, use 1/4 of the expensive oil, and last for years and years. When your custom motor has problems you can be down for the entire season. dare to imagine with me if Seadoo made a semi lightweight, flat cornering, wavepopping, sharp turning hull. put adjustable trim to compensate for different rider weights, 600cc di motor with 120hp and can be service 5-10 min. down the road or get parts from the local dealer. now that would be something i am sure alot of us would be interested in. seadoo has everything they need to do it. they also have a marketing scheme of getting out on the water and having fun. this could appeal to all us recreation riders. as long as they don't make it to be a race coarse ski, they could pull it of. IMO of course.

Very good point. Sadly, with the direction Sea Doo is going they will produce a motor like that.... except it will be housed in a $20,000 dollar ski with hull suspension and a DESS controlled bidet...
 
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