Best 2-stroke ever
#23
#24
Best 2-stroke ever
Originally posted by: DirtRyder420
yes i have rode a cr500 and there is no need for a power valve on one of those beast ..im just saying its a fairly simple but very genius how a power valve delivers useable horsepower ...and i have seen powervalve kits for a cr500 before ...
yes i have rode a cr500 and there is no need for a power valve on one of those beast ..im just saying its a fairly simple but very genius how a power valve delivers useable horsepower ...and i have seen powervalve kits for a cr500 before ...
#26
Best 2-stroke ever
Originally posted by: enFORCER
LOL!!!! 85 makes 50hp huh???????? hahahahhahahahhahahahahahah
Oh man good night!!!!!
Originally posted by: DirtRyder420
thats why a non powervalve 1978cr250 make about 20hp and a 85 makes 50hp ?? come on dude
thats why a non powervalve 1978cr250 make about 20hp and a 85 makes 50hp ?? come on dude
LOL!!!! 85 makes 50hp huh???????? hahahahhahahahhahahahahahah
Oh man good night!!!!!
#27
Best 2-stroke ever
Originally posted by: TheWeedman
i think he meant 1985, not an 85cc
Originally posted by: enFORCER
LOL!!!! 85 makes 50hp huh???????? hahahahhahahahhahahahahahah
Oh man good night!!!!!
Originally posted by: DirtRyder420
thats why a non powervalve 1978cr250 make about 20hp and a 85 makes 50hp ?? come on dude
thats why a non powervalve 1978cr250 make about 20hp and a 85 makes 50hp ?? come on dude
LOL!!!! 85 makes 50hp huh???????? hahahahhahahahhahahahahahah
Oh man good night!!!!!
#28
Best 2-stroke ever
Here is a picture of a CR 500 engine. I can't tell if it has a powervalve or not, so take a look.
DV
DV
#29
Best 2-stroke ever
Know how the higher your exhaust port is the more peak hp you make but the less grunt because it moves the powerband up? all a powervalve does is act like a movable roof for that port. At low rpms it drops down to give you more grunt, at high rpms it raises up to increase the hp. I think sometimes they do decrease overall top end power because they are in the way a bit but they let you run a higher roof at high rpms than you would have before because you dont have to compromise as much to keep the bottom end. In otherwords, for a pure drag motor it would be useless, for a low speed grunt motor it would be useless, for an all around motor its awesome.
The reason older models had less hp is because the ports werent as efficent, and the reason the powervalve motor probably had more power is because they were able to run a higher exhaust port for top end without sacrificing the essential bottom end. On a 500cc machine it isnt quite as essential, they are going to have torque either way.
The reason older models had less hp is because the ports werent as efficent, and the reason the powervalve motor probably had more power is because they were able to run a higher exhaust port for top end without sacrificing the essential bottom end. On a 500cc machine it isnt quite as essential, they are going to have torque either way.
#30
Best 2-stroke ever
Originally posted by: DesertViper
Here is a picture of a CR 500 engine. I can't tell if it has a powervalve or not, so take a look.
DV
Here is a picture of a CR 500 engine. I can't tell if it has a powervalve or not, so take a look.
DV