v-twin 2 stroke?

Discussion in 'Performance Mods' started by motorpsycho, Jul 9, 2011.

  1. motorpsycho

    motorpsycho Active Member

    so when is someone going to come out with a v-twin, dual carb. 2 stroke for us to put on bicycles?

  2. james65

    james65 Member

    I have given up on Acme but will at least say they gave it a try.
    Really doubt that we will see a HT based twin motor.
    There may be a custom twin build but the cost would be way beyond most hobbiest means. But dam it would be cool.
  3. motorpsycho

    motorpsycho Active Member

    yeah it would look cool and it would sound REALLY cool.
  4. Neon

    Neon Member

    Could try jamming a Yamaha Banshee motor in a bicycle.
  5. motorpsycho

    motorpsycho Active Member

    ha ha yeah, but that would be overkill...and it would probably split the bike frame in half, and rip out the rear spokes on the first run.
    i was thinking more along the lines of an 80 -100 c.c. v-twin with the looks of the old indian or harley engines from the 40's & 50's
  6. shell shock

    shell shock Member

    i would kill to see one of these built. i know i would want one
  7. IbedaYank

    IbedaYank Member

    because the EPA and CARB won't let one be sold or imported in the usa so whats the point of making one that you won't be able to sell couple hundred thousand of them?

    that being said there was a V8 made some years ago for the 1/4 scale rc guys ran on rc nitro
    wonder if its still made?

    when you get to a certian power level the bike frame and other components can't take the stress and break/snap

    Last edited: Jul 29, 2011
  8. NewOrleansFlyer

    NewOrleansFlyer New Member

    Shouldn't some of the old twin patents be expired by now. Maybe the effort should be on building a tested motor rather than designing something from scratch. Just a thought. I'm certain, that with some incentive (and financing) the Chinese could crank one out in less than 6 months...
  9. motorpsycho

    motorpsycho Active Member

    I'm not talking about making a v-twin that will produce 15 or more horsepower.
    I'm saying someone should make a v-twin that is the same displacement as a single (66 c.c.) so that the same power output is acheived.
    sure, the pistons would be tiny, but then again so would the cylinders which would help with frame clearance problems.
    I'm just saying that it would be cool to have a little v-twin sitting in the frame of a bike to acheive"the look" of an old Indian or Harley board track racer. a v-twin looks more convincing than a single cylinder.
    forget about the epa and forget about carb.

    yes those little 1/4 scale v-8's are still being made and are available, but if you've got $5,000.00 just laying around to drop on one, it would be a waste of money to try and put one in a bike.
    there would be way too much engineering to even make it work because you would need a way to transfer the power from the flywheel to the bicycle wheel.
    you would have to design a jackshaft or transmission to make a right angle drive to get the power to the rear wheel.
    those little v-8's make some power but i doubt that they would be able to pull the weight of a bike and a rider. they don't make enough torque to get the job done.
    having one in an r/c car is one thing, and a lot less weight for it to move.
    having one in a bike wouldbe a major undertaking in designing a drivetrain and you'd end up with $10.000.00 in a bicycle.
    you might as well just go buy a motorcycle and be done.
  10. 5-7HEAVEN

    5-7HEAVEN Active Member

    Twin Happy Time Engines!

    Three years ago, I toyed with a project using TWO HT engines, side by side. Back then, no shift kits were in use.

    I believe it's do-able, at not too much expense.:idea:
  11. IbedaYank

    IbedaYank Member

    if it was easy it would not be as much fun.
    as far as making it work shaft drive motorcycle just make the parts a little smaller
    look up BOSSHOG cycles
    brigs does make a horz. vtwin motor but its like 25 horsepower
    would be hard to get a cop to believe its a assist motor of less than 2 horsepower lol
  12. IbedaYank

    IbedaYank Member

  13. DougC

    DougC New Member

    The Acme wasn't a v-twin, it was two single-cylinder engines connected by a common gearwheel. A v-twin would be a two-piston engine with both connecting rods sharing the same crank pin. .....Not that I blame Acme, building a true v-twin would have been way more work, using parts from a supplier that could alter their specs or halt production at any time.... But the only reason they took it as far as they did was that it was a fairly cheap and simple way to achieve something that looked kinda-sorta like a twin engine.

    If I was even dreaming of producing such a thing to sell, there would be no way I'd base it on 2-strokes. They're already banned in many countries, and soon will be in many others. Like it or not, oil-burning two-strokes are a dying market.

    Four-stroke engines don't combine as easily since each has its own valve train already.

    If you want a v-twin there are some lawn tractor engines, but most cost $1000+ and are at least 18-20 HP. They weigh 80-100+ lbs, but would last darn near forever if you cut the power output by 75% or so.
  14. motorpsycho

    motorpsycho Active Member

    This is exactly why i am thinking about a v-twin 2 stroke....4 strokes are too heavy and way too expensive.
    2 strokes have the ability to make way more power than a 4 stroke of the same c.c.'s unless you dump a ton of $$ into a 4 stroke.
    I just think it would be really cool to see a 66 c.c. 2 stroke v-twin..more for the looks than the performance. Heck, each cylinder would only be 32.5 or so c.c.'s and the pistons would be tiny....which would reduce the size of the jugs, making it easier for one to fit into a bike frame.
    I'm just thinking out loud, not like i'm going to try and design one...but it sure would be cool.
  15. V 35

    V 35 Member

    Back in the late 50 's - 60's E.J. Potter [ The Michigan Madman ] built a
    Flathead 6 powered bike for Bonneville duty. It had two controls, a throttle, and an on / off switch. Power was transmitted directly, the bike was jacked up, engine started, jack lowered with rear tire spinning.

    I personally saw a Chevy V8 powered Gold Wing, darn thing looked stock.
  16. motorpsycho

    motorpsycho Active Member

    actually e.j. potter did not use a flathead on his bike. He was a dragracer, not a bonneville racer
    He used a small block chevy with hilborn fuel injection and the bike was called the widowmaker. The very first version of that bike had a carburator on it but he built another bike with the fuel injection.
    The bike had an "in and out" box, meaning it was either in gear or out of gear like a sprint car. The bike was started on the kickstand, revved up and then dropped off the kickstand to get it moving. The 10 inch slick would smoke for most of the 1/4 mile.
  17. davewelch2000

    davewelch2000 New Member

    how did that work did you go crank to crank one or two carbs fireing on the same stroke or oppasit iv been wanting to do that but didnt know if it wold work i mounted a vacume cleaner impeller on the crank of a 2 stroke and plumed it into carb dont know if it helped or not but if i leaned the bike over to far it would suck up gravel
  18. motorpsycho

    motorpsycho Active Member

    wow, a vacuum cleaner impeller attached to the crank...that had to really suck :)
  19. 5-7HEAVEN

    5-7HEAVEN Active Member

    This is as far as I got:

    After buying two 80cc engine kits, I got two bolt-on Happy Time engine motor mounting plates made for OCCC chopper bikes. Then I bought an 1/8" steel plate. Also acquired was an engine plate for 4-stroke engine.

    Having two HT engines side-by-side made for a wide package. Having centrifugal clutches would've simplified engines' operation, but make for an even wider setup. A jackshaft was needed; freewheel sprockets would work to separate each engine's chain action. However, centrifugal clutches and pull starters would then be necessary.

    That's where I abandoned the twin-engine project. At that time, shift kits were not offered yet, so a single rear sprocket woud have been necessary.

    Looking back in retrospect, the flimsy OCCC engine mounts would not have been sturdy enough for the project.
  20. davewelch2000

    davewelch2000 New Member

    yae i think it took more power to spin the impeller than it gave me in boost idk it was a plasitc housing mounted to a plasitc pull start houseing with a socket to boilt on magnito i had it on a 49 cc mini chopper i ran it for about 150 miles got sick of it comming apart cause plastic and vibration gave a good kick and broke it off