What do you think of these new "CNC" manufactured engines?

Discussion in '2-Stroke Engines' started by iron_monkey, Dec 10, 2010.

  1. iron_monkey

    iron_monkey Guest

    Below is an interesting offering...

    http://cgi.ebay.com.au/66cc-CHROME-...pt=AU_Sport_Cycling_Bikes&hash=item230c2fb4ea

    Very cheap price for something CNCed, what do you think?

    Just a normal happytime simply painted over with good chrome paint or does it look like it genuinely has better materials but cheap because its made in China?

    Would be nice if someone from Sydney, Australia is interested enough to drive to Southwest Sydney to have a look in person (assuming the seller lets you).
     
    Last edited by a moderator: Dec 10, 2010

  2. RingTing

    RingTing New Member

    I think CNC is standard practise these days. If it ain't CNC then maybe it's 'Hand Crafted' an you'll be payin extra?
     
  3. gothicguy64

    gothicguy64 Member

    welcome

    not only do i live in sydney but my motor is a genuine billet rock solid engines motor ...

    now that dll looks stock with a bit of polish ...
    u do have 3 choices ...

    1 buy a rocksolid engine
    2 buy a eziridecycle engine
    3 buy zbox


    brad
    sydney
    :detective:
     
  4. HeadSmess

    HeadSmess Well-Known Member

    thats what i wanna hear!

    everything is now CNC, or at least NC.

    quality comes down to program, operator, and machine.

    repetivity to .0001 mm, etc etc...been used since the 50's at least (they was using punchcards! like a freakin player piano!)

    before the use of electronics, they used "cam" lathes(turrets, capstans, etc)... and everything was worked out with pen and paper, slide rules, and brains.

    ppl who knew what they were doing, unlike today...

    so, cnc should be MUCH CHEAPER as its a MASS PRODUCTION TOOL.


    (though in certain circumstances the old cam lathes can actually be faster and more precise...just noone knows how to set them up anymore. and "CNC" sounds fancy)
     
  5. HeadSmess

    HeadSmess Well-Known Member

    iron monkey? isnt it "steel monkey"? (jethro tull, awesome song :) )
     
  6. RingTing

    RingTing New Member

    Our factories are now located in China and they will do whatever and prosper. CNC is what delivvers and they know. We can be delighted with the price but refuse to know the cost.
     
  7. give me vtec

    give me vtec Active Member

    Uhhh..... Come on guys. I can see the rough castings on the cooling fins from my iPhone. There is no way producing something by a cnc machine is the cheapest and not everything is made by cnc machines. They make a chrome painted version of this engine... It goes by the name phantom.

    The only cnc products for these motors are billet aluminum and are sold by rock solid out of Australia. Their stuff is ridiculously expensive...

    Here is a cheap lesson... Don't believe everything you read on eBay.
     
    Last edited: Dec 11, 2010
  8. GearNut

    GearNut Active Member

    That is just a chromed engine. There is nothing special about it as far as CNC is concerned.
    As far as I know, Manic Mechanic still produces CNC parts as well. They are sold through Pirate Cycles.
     
  9. iron_monkey

    iron_monkey Guest

    I've scoured rock solid cycles and even the only CNC stuff they do are the cylinder head and the actuator. The rest of the engine is standard casting.


    Anyway, its not too big a deal CNC or not. Just curious at any new developments in how they are made in the Chinese factories.
     
  10. give me vtec

    give me vtec Active Member

    That's pretty much what I said.

    Only new developments are the ones madated by the EPA... You can bet on it.
     
  11. HeadSmess

    HeadSmess Well-Known Member

    hate saying it guys, but...

    the screw holes and studs, threads etc... done by cnc.

    the main crank bearing housing in the cases. cnc.

    the crank...cnc.

    bearings...cnc.

    clutch pressure plate...stamped...but the stamp is invariably...cnc!

    lets seee now...

    cylinder bore, exhaust and inlet valve flanges... cnc. oh, and stud holes.

    cylinder head...sealing face and stud holes...cnc.

    every part of these engines, will have been through some type of cnc process.

    just that the basic part shape is usually cast. ie, cases, cylinders....

    CNC IS NOT MAGIC! it is a cheap way of securing repetivity!

    look, my freakin beer bottle is cnc!

    (and actually, any machinist will tell you "cast" is far better than "billet"(6061 t1-6)...when dealing with alloy...it machines sooooo nicely)
     
  12. GearNut

    GearNut Active Member

    I completely agree with you, HeadSmess.
    However the whole thing came across as though the entire engine was CNC'd out of billet.
    A billet, CNC'd bicycle engine with lots of shiny chrome.
    Darned near everything that is manufactured with some sort of mechanical assistance can be considered CNC'd these days. The robots that have been welding cars and trucks together for the last 15 years or more are all CNC machines. CNC does not necessairly have to refer to milling, lathing, or any kind of metal cutting.
    Robots are after all, Computer Numerically Controlled.
    Servos, sensors, motion counters, ect.
     
  13. DuctTapedGoat

    DuctTapedGoat Member

    I do like the CDI, fuel line & filter. But the fins look like **** - bent, not cleaned up before chromed. They chose some bad jugs to show in their retailer pics. When it's chromed as well, you can't see the minor imperfections below the nickel plating, so who knows how clean a job they did with their CNC machine. Lastly, that's a JACKED up price for a 66.

    http://www.rawmotors.com/80cc-Bicycle-Engine-Kits-c10/

    66cc motor is 139, 66cc with pull start is 199.
     
  14. Dave C

    Dave C Member

    I'm pretty sure they have always used CNC machineing. It's just that someone in Marketing discovered the "magic" of useing the term in advertizing. We're supposed to be so impressed by a "new developement" that we dump our old motors(made the exact same way)and buy the

    *NEW DOUBLE THROW-DOWN CNC MOTOR!!!*

    Marketing, pure and simple.
     
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