two options for the moddified F/D im working on

Discussion in 'Rack Mounted Engines' started by dchevygod, Nov 11, 2011.

  1. dchevygod

    dchevygod Member

    Ive modified a daemon friction kit because of design flaws and now have two options i could work with. For one thing im staying away from gear reductions. Iv found a 9t sprocket for a 5/8 shaft and 48 is the largest rear sprocket ive seen that i can make work so i need a larger rear sprocket made or something. I also thought about the belt drive stuff ive seen on electric scooters and such but the tall gearing is an issue here as well except for the dual rim hoop pulley idea i saw some people do. In the friction setup its ok but im ambitious to say the least. The engine for this build is a CY460R no matter what configuration it is upon completion. The first thought was to just leave it friction but im pretty sure that ill eat tires really bad with 2.8 ft/lbs of torque and 4.2hp.
     

  2. 5-7HEAVEN

    5-7HEAVEN Member

    Eat tires real bad? I ran a 460 engine on friction drive. On one occasion, every inch of the rear tire was covered with deep grooves...in a matter of one week.

    When I swapped to chain drive/shift kit, I never replaced the rear tire again.:detective:
     
  3. lowracer

    lowracer Member

    dchevygod,
    I experienced the same tire chewing problem running friction drive with a high powered pocketbike engine. I switched both pocket bike engine bikes to v-belt drive. I still have one of my MB's setup as friction drive but with a low powered Subaru Robin EH035 & it seems to do fine. It hasn't eaten a tire yet.
    -Lowracer-
     
  4. 5-7HEAVEN

    5-7HEAVEN Member

    How's your project coming along? What size chain does your 9t/48t sprockets use? JMO, but I would avoid custom sprockets until you decide if you're going sprocket, friction , belt or CVT drive. Experimenting gets expensive, I know from experience. Try using OEM stuff for pocket bikes, scooters, etc. They're cheap. Then when you're satisfied with the results, custom machine your specific drive components.

    Hey, how's that modified daemon friction drive project coming along? Got it running yet?
     
  5. dchevygod

    dchevygod Member

    Well 5-7 im sure it would work pretty good but the spindle is slightly off causing binding with the outer support bearing installed. I had a pedding buddie offer me a gebe drive/wheel sprocket and belt soo that is an option that needs some thought before proceding but im just pipe dreaming a lil bit. once my motobecane is on the road youll be the first to know!
     
  6. dchevygod

    dchevygod Member

    yay!

    I was given the sheave, belt and drive cog from a GEBE kit for free! And my F/D i might sell it and put the $ towards the 460 purchase. but ill need to figure out a rack for my engine, because the F/D doesn't line up for that at all. I would have to flip it around and space it to one side, I think it would look funky. I do have disc brakes and that is a limiting factor i have to deal with. I cant just use the axle as a mounting point for a strut system :confused: thats still the biggest issue ive had so far. Today i made the unused existing brackets for the v brakes a usable strut mount, with some turnbuckles and a few pieces of threaded rod. I still need to weld a small steel piece onto the mount for the goped tank and right side turnbuckle/strut to bolt on.
     
  7. 5-7HEAVEN

    5-7HEAVEN Member

    Looks like you have at least two motorized bike projects going for you.

    Any pics?
     
  8. dchevygod

    dchevygod Member

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    Last edited: Jan 18, 2012
  9. 5-7HEAVEN

    5-7HEAVEN Member

    Ingenious support/turnbuckele location!

    How are you retaining the outboard bearing?

    Are those two holes to mount your goped tank? That's where I mounted mine.:detective:

    You'll ride 4 times farther with a 4-liter HT tank on the top tube.:idea:
     
    Last edited: Jan 22, 2012
  10. dchevygod

    dchevygod Member

    thanks man! That was the only option i could see working.

    The bearing has a retaining clip.

    Acctually those holes are to access the mounting bolts easier, the plate im holding Is the mount location for the tank

    I need a fuel return and the cables are on the top tube or id do a ht teardrop tank for sure.
     
  11. 5-7HEAVEN

    5-7HEAVEN Member

    When I ran my 460 engine w/HT tank, I simply plugged the return line.

    My pal Rick did the same on his 460/HT tank.

    My other pal's bike had cables on the top tube. He added lengths of cable housings where it ran under his HT tank.
     
  12. dchevygod

    dchevygod Member

    I made the FD mount useable for my belt drive. I flipped it over and cut a large slot for the belt to pass thru. Ill have to modify the spindle to accept the drive gear but everything lines up. Ill post pics later.
     
  13. 5-7HEAVEN

    5-7HEAVEN Member

    Yeah, I think the belt drive will work better for you.

    Waiting for pics!
     
  14. dchevygod

    dchevygod Member

  15. 5-7HEAVEN

    5-7HEAVEN Member

    Looks FANTASTIC!

    What size is the sheave, and what size is the small pulley?
     
  16. dchevygod

    dchevygod Member

    17" sheave but I don't have a pinion for it yet :( I'm not sure what size to get or from what type of other application. The gebe one won't work without modification to both spindle and sprocket. I am thinking that a piece of belt epoxied to the spindle could work. If it does then the pinion will be about 7/8" maybe larger. When I flipped the mount the turnbuckles aren't long enough now and the one one the belt side had to go cause the belt was touching it. so i need a longer better quality turnbuckle on the engine side and that should be sufficient I hope, the only other option is to use some clamps on the frame down tubes to attach some strut straps similar to the axle mounted ones.
     
  17. dchevygod

    dchevygod Member

    Thanks man! I cut and widened that slot with a dremel! Do you know anyone with a gebe sprocket they can measure for me? I need to know what diameter the different teeth count sprockets are as well as inside diameter and width.
     
  18. dchevygod

    dchevygod Member

    Ok ok where do i find a 4 L HT tank on the cheap? I want to put a basket on the other side of the rack mount for apperance and weight distribution. I guess im going to make a spacer and use the brake caliper mount tab to attach a strut too. I just cant bring myself to leave it one sided if not for strength for cosmetics.
     
  19. 5-7HEAVEN

    5-7HEAVEN Member

    A couple year's ago, I tried to do what you're doing now. I got some sprockets from an online site. When I drilled them to accept a .5" BMP driveshaft, there wasn't enough meat to notch the keyway. So I gave up the project in favor of a center/mount shift kit assembly.

    Come to think of it, I shoulda welded the sprocket directly to the BMP shaft. Shafts and sprockets weren't that expensive, so I coulda made a couple with different gear sizes.

    I forget where I got the sprockets, but you can google here or on the other website.

    Throw out that question regarding GEBE size. Someone's bound to answer.

    I asked that same question, so it's prolly in that same thread of mine.
     
  20. dchevygod

    dchevygod Member

    I plan on just using a set screw and a shaft with a flat section, Instead of a keyway. I need to know how big the 13 and 14 teeth gebe sprockets are. The evo scooters use a 19-23 tooth 5m sprockets for their belt reduction setup so that is an option as well. Ill need the i/d to be no smaller than .59" with enough material left for a set screw " it should be easy if the 14 t is just over an inch in diameter " witch is what im hoping for. Im just going to use the moddified spindle ive got modded again to accept the gear.
     
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