Largest displacement friction dive? Or most HP?

Discussion in 'Friction Drive' started by Blackstar, Jul 29, 2013.

  1. Blackstar

    Blackstar New Member

    New guy here. Curious how much power has been ran through a friction drive, or the biggest engine you've seen driven this way? I'm Attempting something a little rediculous. Im getting ready to strap a built Honda GX200 onto the front wheel of a bike. The motor is a brand new GX200 with ported gx160 head, 26lb valve springs, 3 angle valve grind, 1.3 ratio rockers, flat top piston, governor system removed, billet flywheel, timing advanced 8 degrees, carb bored to .625, 140 e-tube, 92 main jet, etc. Havent dynoed the motor yet, but should make about 16hp @ 5k.


    Im building the front fork from scratch so I can support this monster and its 3" spindle. The header pictured will be ditched for something more low profile and a bit tamer sounding. This was just for bench tuning. The recoil will also be removed in favor of a screen, and the motor will be bump started.

  2. grinningremlin

    grinningremlin Active Member

    Crazy, but my hat's off to you.What you're concerned with first is: making sure the spindle is of sufficient diameter so as not to spin and burn a hole in the tire on high/quick throttles.With a 52cc I used a 1.25 inch spindle and still it spun on the tire.Second, PLEASE, if you get this working, go out to a BIG parking lot and do some slaloming and evasive maneuvers to see if you can handle it before you engage any caged traffic.I believe this will be the biggest problem, other than the fun of having to change a flat on the road.
    Best of luck, and document it here please, GG.
  3. darwin

    darwin Well-Known Member

    That's scary on the front with all the weight and torque.........let us know how it went when you get out of the hospital.
  4. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Largest displacement friction dive? Or most HP?

    you win..........maybe? if it is even driveable?
  5. seanshonda

    seanshonda New Member

    its been almost a yr., did it ride? you alive?
    that's a lot of weight on front tire, if I had that motor, id put it on a trike.
  6. butre

    butre Well-Known Member

    I was doing a belt drive hf212 build a while back but it cost too much money in tires so I had to scrap it. it was sitting at around 10 horsepower and with a 3 speed was good for at least 50. that engine and transmission are on a go kart now and it's still a little little ridiculous even with an extra 8 inches of contact patch
  7. seanshonda

    seanshonda New Member

    was it on your front tire? it would be cumbersome w/ 20# on front tire, plowed steering when wet/off road.
  8. butre

    butre Well-Known Member

    it was center mount, not rack.
  9. HeadSmess

    HeadSmess Well-Known Member

    pffft. some early cars were FD....

    so, 3 litres, 1/2 hp... :jester:
  10. rawly old

    rawly old Member

    Off the top of my head, I'd say about the max. practical hp. on a
    bicycle frame FD is 3 hp, maybe a stretch at 4, top rpm around 9000.
    Much over that, and you'll be putting a tire exec's kids thru college.
  11. Mountainman

    Mountainman Active Member

    My Station Honda 50 rear friction drive delivers all one would ever expect or want in a very nice riding motorized bicycle. Top speed is around 35 MPHIL and this rig never breaks down. I want to ride and not repair.

  12. 2old2learn

    2old2learn Member

    Hey Mountain Man , I've got a Staton 50 FD over with David right now getting converted over to his pedal axle shift system. Can't wait to get it. I've been crippled from doing some of my backpacking trips and canoe trips without a reliable drop off vehicle. Plan to use it on some of my hanggliding adventures too. In fact the winds are soarable right now at one of my local mountains and I'm bumming!
  13. Mountainman

    Mountainman Active Member

    That's cool. Will your motor stay in the same place (on the rack) or be moved. I guess that you live close to David ?

    My first friction drive from them was the Subaru 35cc and now the Honda 50cc.
    Been riding these for around 8 years now. (Strong with no break downs).

    Sounds to be exciting for you there --have fun.

  14. 2old2learn

    2old2learn Member

    David's a 4.5 hour drive from my home so I can get there by lunch and back home before dark. Here in the rural south everything's a bit of a drive away, but we learn to love the land and it's forests. Been to big cities, can't say I'd like to live in one. Neat to visit though. I'd love to do the PCT out there in your state. My son got to Fly out and do half dome last October, which messed up our plans to do a 180 mile backpacking trip up in NW Arkansas on the Ozark Highland Trail.
    The motor will be rear rack mounted as normal on a Specialized Hard Rock 29er. I have a China toy on my son's 26 inch cheap mountain bike which opened my eyes to the possibility of building a reliable drop vehicle for my adventure hobbies. Might even grab me a single wheel trailer for some long rides. I've already got a bunch of ultralight camping gear.
  15. Mountainman

    Mountainman Active Member

    Put a smile on my face. I wish that I could hike like that. Getting to be an old Mountainman here.

    But, I still love to ride that thing.

  16. 2old2learn

    2old2learn Member

    John Muir hiked the Yosemitee area in his 80's! One of our hikers in NW Arkansas did the AT after he retired at 65. Though he did remark that if he could do it over again, he'd have done it at an earlier age!

    Mountainman likes this.
  17. fooey

    fooey New Member

    2old2learn, do you mind if I ask you about Staton? It sounds like you have spoken with David recently.
    I ordered a FD kit from him last Thursday (4/23). The friendly guy who took my order had a young voice, so I assumed that wasn't Dave. I was told that the kit would go out at the latest on Friday, and when I questioned my bank, Staton had posted the purchase that day. It didn't go through on their end, or David withdrew the order.
    I had no message as to why that was, and nobody answers their phone when I've tried to call. I left a message yesterday before I knew that the payment wasn't posted, requesting a tracking number and I left my email address, but I've received no communication from Staton at all.
    It was people like you on the forum who gave me confidence to try this FD. I'm disappointed that it won't happen, but a little relieved, too because something didn't feel right, and some of the postings others have made about unresolved problems with Staton gave me reason to worry about having used my debit card (I'll never be that stupid again...) I had to change my debit card today because I don't know what happened and don't want some scammer having access to my bank info, if that's a possibility.
    All I can guess is that either he doesn't want my money or the business is going under. Some communication on his part would have been nice.
    Is there another manufacturer of decent FDs today?
  18. Mountainman

    Mountainman Active Member

    I have dealt with Station on several occasions with two large purchases. Note,they always come through. Nice solid kits.Run forever with next to no repairs. MM
    fooey likes this.
  19. 2old2learn

    2old2learn Member

    David has a young man working with him handling paper work. I know David has been swamped with orders. I have every reason to believe that David is a good man, a man that can be trusted. You may have better success by calling him.
  20. fooey

    fooey New Member

    Well, that's the problem. Nobody answers when I call.
    I have a funky phone that doesn't identify the phone number of those who leave voice mail messages. I've received a few since last week where the person hangs up and says nothing. If that was Staton, I assumed that he would say something like, "Hello, this is Dave Staton and we may have a problem with your order.... please call us as soon as possible so that we can get this shipment out to you..."
    If he can't or won't do that for some reason, I guess I will look elsewhere for a motor. If he doesn't want my business, I won't give it to him. Unfortunately, I think that now I will need a better car/better non-motorized bicycle combo because I don't know of FD vendors I can trust, and I don't want to wrench more than ride. It just isn't as much fun/isn't convenient putting the bike on the train/bus rather than riding it everywhere I need to go, especially when NM winds kick up in the afternoons.