| Author | Message | ||
     Rick_a |
The Kneeslider JJ2S X4 500 concept motorcycle  | ||
| Tmc |
I want one | ||
| Brumbear |
I'd hate to rebuild it and a 2 stroker probably is gonna need rings like 2 times a season | ||
| Citified |
looks pretty simple to me. | ||
| Gentleman_jon |
Isn't it great to see some really original design work? I hope this motorcycle sees the light of day. | ||
| Ft_bstrd |
I just want one hour alone with that bike. Man that looks fun. Four cylinder, 500cc, two-stroke. Once it hits the power band, look out! | ||
| Ft_bstrd |
The animation of the engine is intoxicating. | ||
| Hughlysses |
Once it hits the power band, look out! Yea, remember what Erik said about the RW750- "There were places in the powerband when it would pick up 40 horsepower in 500 RPM!"  | ||
| Ft_bstrd |
Sometimes it would be fun to get a hold of a bike that scared the crap out of you. I'd think this one would qualify. Since it's lubricated through a normal 4 stroke dry sump system rather than through the fuel delivery, it would seem that it would have the capacity to meet emissions requirements. | ||
| Hughlysses |
Chrysler looked seriously at building automotive 2-strokes like this around 1990. For some reason the project fell through, but the designs promised a lot of advantages- lighter weight, fewer moving parts, good powerband, etc. Read more here: http://www.allpar.com/neon/stroke.html | ||
| Rick_a |
The flyscreen reminds me of these aero helmets   (Message edited by Rick_A on July 27, 2008) | ||
| Brumbear |
rebuilding that is not simple and 500cc 4 cyl 2 stroke is a widow maker for sure that being said I would like to ride one just once | ||
| Spiderman |
That header has got to rob a ton of power from that beast... | ||
| Rick_a |
It's a streetbike. A two smoker tuned to the hilt won't last long, just like a competition four stroke doesn't either. There's a lot of street going two strokes in most other parts of the world. The only ones left here are scooters. Just because it's a two stroke variant doesn't necessarily mean it's going to be a hand grenade, or that it's going to flip off anyone that dares to ride it. (Message edited by RIck_A on July 27, 2008) | ||
| M1combat |
Couldn't you tune each cylinder for a different power band? Wouldn't that broaden the power curve (and smooth the power band)? Obviously that would reduce peak power, but if it's possible wouldn't the benefits be worth it? | ||
| Gentleman_jon |
Here is the link to their spec. sheet. http://www.jjsdesign.net/jj2sx4500/danetechniczne. html Unfortunately, I don't understand Polish, but it appears that the bike weighs about 155 Kilos. (341 lb.s). Power is 110Km @ 8000 rpm. I don't know what KM are. If they are anything like Kilowatts, that would be 146 horsepower! It appears to have sleeve valves that are shown in an animation, but that link isn't working now, and reed valves. Anyone on the board understand Polish? Love to know more about this thing. It is just a rendering at this point, but I like the way it looks. | ||
| 86129squids |
SICK looking bike! I've got a soft spot for 2-strokes fer sure... Quextion: Where are the expansion chambers? Otherwise, most of what I see makes sense. If this is a rendering/concept that is. I wish I had my RZ350 again- absoulutely a thrill to ride, specially cuz it was .40 over, with Spec II pipes, Boyesens, 1 tooth shorter on the countershaft sprocket, etc. It had the genetic defect in the ECM for the year- '84 I think? What I loved the moist about it was the YPVS- Yamaha Power Valve System. The exhaust valve height was variable according to throttle position- basically quadrupling the "powerband". Once I disconnected it- the bike reverted to classic 2-stroke puny/pipey/POWER/puny behavior. Too bad Bimota's V-Due was doo-doo. I had high hopes for that one, and a dirt variant that Honda once had running on the Paris-Dakar maybe? Nothing like the smell of Yamalube freshly cooked!! | ||
| Rick_a |
The engine animation is here http://www.jjsdesign.net/jj2s/video/jj2s05.avi It's a sleeve valve with a fixed piston. The crank looks more like an eccentric cam. Very cool and very simple. | ||
| Blasterd |
Rebuilding a two-smoker is a piece of cake, I have had a lot of them in the past and rebuilt several of them, but that one likley is a pain in the @#*. I have a Suzuki t350r right now, 2 stroke parallel twin street bike with a 51 inch wheelbase. Ken (Message edited by blasterd on July 28, 2008) |
