RPMS? By oldscootcoot (Read 850 times)

[oldscootcoot]

Curious for those that have tachs what kind of rpms your scoot turns. With my current variator/ final drive/ tire size I seem to be turing on the average 1K/10mph once a constant speed is reached. Varies slightly with wind/ loading/ etc.

[redroush00]

7000-8000 from launch to 35...I cruise at 30 to keep rpms around 7500

[oldscootcoot]

Thanks for the reply. I haven't checked my 49cc but it sounds like its in a similar range as yours. Living in the flats I tune my variators with heavier weights to get into the high range fairly quickly. I have ordered some 10gm rollers for it, currently has 5.2gm. Hopefully will improve the acceleration a bit.

[redroush00]

Your thinking is backwards. The heavier the weights the slower the take off and lower rpms. You want to tune it so your in the powerband. You should get a tach. Example, If im running 5 gr weights (which i do) and you run say 7-8-9 or 10, and we drag race a city block your're in the dust. It will take you a lot o distance to catch up and eventually pass me because you have the ability to obtain higher speed with heavier weights. Its not practical to run that setup.

Most run 5-6 gram sliders. 10 is in the range of 150's!

[LUKE]

what? redouch00, 30mph on 7500rpm? gosh hows your gas mileage then??
Alley,red's scooter needs some cyber overhaul..lol pls help..ty maybe he's shy to ask.

i cruise 60mph on 62rpm... oh i love fuel injection..

[oldscootcoot]

Oct 29, 2013 9:20:30 GMT -6 @redroush00 said:

Your thinking is backwards. The heavier the weights the slower the take off and lower rpms. You want to tune it so your in the powerband. You should get a tach. Example, If im running 5 gr weights (which i do) and you run say 7-8-9 or 10, and we drag race a city block your're in the dust. It will take you a lot o distance to catch up and eventually pass me because you have the ability to obtain higher speed with heavier weights. Its not practical to run that setup.

Most run 5-6 gram sliders. 10 is in the range of 150's!

Actually it all depends on t a lot of variables. The faster you can get into high ranges the faster it will accelerate assuming you have the power to pull the higher ratios. My 49/80cc sounds as if the clutch is slipping because it takes so long for the lighter rollers to begin to enter the higher ranges. Eventually it gets there and we are finally going. I could see with a stock 49cc the lighter rollers being fitted for real world situations such as loading and hill climbing. As I have said I live in the coastal flats, I don't need the lower ratios supplied stock. Both my scoots have the needed power to enter the higher ranges as soon as the clutch is engaged. I run a 1K clutch and contra springs. This allows the engine to band up a bit. As soon as it bites the heavier rollers head into the higher ratios accelerating very respectably, because I have the power to pull them. If it didn't it would be a slug indeed. That's the beauty of a CVT it wont ratio up if the power is not there, at least immediately. I am running 16gm sliders in my 150/163cc and it has surprised a few M/Cs away from traffic lights because its so immediate.

[redroush00]

I need the higher rpms for launch because im not light. The downside is higher rpms at higher speeds too. Once i hit 40 it at 8000 so i dont go past 35...like alley said you cant have killer takoff and top end at the same time. Unlike 150s where higher rpms aren't needed, 50ccs can run a bit higher rpms.

[Alleyoop]

My 150/182cc Trike is setup with 12gram Sliders and it runs just about 10mph for every 1.2-1.3K rpms. At 50 my rpms are 5100--5200 at 60 my rpms are 6100---62000.
Alleyoop

[oldscootcoot]

Oct 29, 2013 20:03:53 GMT -6 Alleyoop said:

My 150/182cc Trike is setup with 12gram Sliders and it runs just about 10mph for every 1.2-1.3K rpms. At 50 my rpms are 5100--5200 at 60 my rpms are 6100---62000.
Alleyoop

Just about the same as my set up though arrived at by slightly different means. My scoot originally had 12gm rollers. When I went to the Dr Pulley variator I moved to 14gm sliders which were an improvement over the 12s. Currently running the 16s and have a set of 18s. Will probably experiment with mixing 14/16s. The traffic I normally cruise in averages 50/55. Its nice to be able to cruise at those speeds in the mid 5K range. I may benefit from spinning the engine a bit more as it probably never gets the full benefit from the A10 cam, but why? I have an honest 65mph top now. Also the lighter rollers in most 49s limit the speed to the 35mph range for legality. My advice is once the engine has been "cleaned up" for improved running start with heavy rollers and work down if necessary. They are cheap enough to experiment with.

[Guitarman]

8000 RPM? Wow.
I run 5k from 40 to 60mph and then it slowly climbs to 6000 for 70mph.

[redroush00]

Welcome to the world of the 150. If I have my rpms in the 6000-7000 range i mighgt as well push the damned thing...better yet, walk.

Its like a 4 cyl Honda and a V6 mustang...Smaller motor higher rpms needed to achieve a similar result.