I heard again today at the dealership as I was picking up my new rx1 that Yamy is coming out with a 2 cylinder turbo 4-stroke in 06
Any truth to this snip-it I found on another site guys?
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Mighty
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Would you care to make a wager 8)spray25 said:
That would be interesting to have a 2 cylinder 4 stroke with a turbo for a smaller displacement sled. It would be like having a three cylinder 2 stroke. How effective is a turbo when you only have the 2 cylinders??? Can you put a turbo on a 1 cylinder. The 1 cyliner could be like the Bravo. Would like Yamaha to get into the smaller displacements. Looking for a sled for my 14 year old son and a small 4 stroke would be great.
I meant to say that the 2 cyliner 4 stroke would weigh the same as a 3 cylinder 2 stroke. I realize that the power would not be similar but it would be interesting if it could. Do I hear Snow X/ditch banger???? After what Yamaha has done with all of thier 4 strokes I think it is possible. My dealer said before the 4 stoke can out that he could not see a bike engine in a sled... WELL!!!! So if there is rumours to the fact let Yamaha try.
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I think that you will likely see Yamaha do something similar to what they do with the PWCs.
In the watercraft, they use variations of the same engine to get different power levels.
They have 110, 140 and 160 hp engines that are all very similar. They all are 20-valve 4-cylinders but have slight differences such as bore size, compression ratio and maximum rpm that give different power levels.
I think you will see something similar in sleds. Yamaha will probably come out with a variation of the triple that the Vector, Rage and Venture use and make some slight changes to drop it down to 100 hp. This would make for a good replacement for the Venom.
I think its very likely that Yamaha will use a 2-valve cylinder head for this engine because it will limit the high-rpm efficiency of the engine but by keeping the displacement big it will still have lots of low-end torque.
Also, by only having 8 valves they will be able to drop some more weight.
I like the idea of a twin, but I have my doubts as to whether it will really happen.
Lately Yamaha has been build engines that have smaller pistons which move at a higher rpm. I dont see them building a big twin because Yamaha owners are used to smooth engines.
Ride a Yamaha triple or a 4-stroke and then go ride anything else and you will see what I mean.
Hebi
In the watercraft, they use variations of the same engine to get different power levels.
They have 110, 140 and 160 hp engines that are all very similar. They all are 20-valve 4-cylinders but have slight differences such as bore size, compression ratio and maximum rpm that give different power levels.
I think you will see something similar in sleds. Yamaha will probably come out with a variation of the triple that the Vector, Rage and Venture use and make some slight changes to drop it down to 100 hp. This would make for a good replacement for the Venom.
I think its very likely that Yamaha will use a 2-valve cylinder head for this engine because it will limit the high-rpm efficiency of the engine but by keeping the displacement big it will still have lots of low-end torque.
Also, by only having 8 valves they will be able to drop some more weight.
I like the idea of a twin, but I have my doubts as to whether it will really happen.
Lately Yamaha has been build engines that have smaller pistons which move at a higher rpm. I dont see them building a big twin because Yamaha owners are used to smooth engines.
Ride a Yamaha triple or a 4-stroke and then go ride anything else and you will see what I mean.
Hebi
Who said it would need to be a "big" twin. I think a 600-700 cc twin turboed on a light sled could be the sled a great number of us would want as long as the suspension and handling were dialed in for a change.
JDKRXW
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Hebi said:
I think you're right about the two valve head, but your reasoning is not correct. If we're talking about factory turbos, boost takes care of the engine's breathing efficiency, and 2 valves can be made to perform the same way a 5 valve head does....... so two valves can run great at 10,000+ rpm (and I'll take HP over torque every time)
Bakemono
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Not me. Id much rathar have an engine that makes 100 ft-lbs of torque and only makes 80 hp than to have one that makes 100 hp and 80 ft-lbs of torque.JDKRXW said:
You dont feel horsepower but you do feel torque.
Also, you NEED something with a lot of torque in a snowmobile. There is a lot of drag in the track and the skis and without lots of torque you would need a 3 mile run just to break 100 mph.
Look at it this way, a Toyota Celica GT-S puts out 190 hp but most of them are pretty slow off the line because they make very little torque. They dont seem fast because of this. Compare that to a 5.0L Mustang which makes similar power numbers but seems a lot faster because it has the torque going for it.
Gimmie torque over horsepower any day.
Hebi
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