60 MPH...achieveable? Who cares?!? Let blueprint an engine!

Discussion in 'Motorized Bicycle General Discussion' started by DVBikes, Mar 18, 2010.

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  1. Creative Engineering

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    60 mph isn't that fast...This bike will handle it fine. DV will be wearing full protective gear.

    It will probably be set-up to have a max speed of 40 mph for the customer. He will have awesome acceleration when pulling out of corners.

    For our top speed test, we will use a 30-32T rear sprocket.

    Get the engine to make 5-6 hp at 10,000 rpm and 60mph should be a breeze.

    Hawaii Ed's signature shows his bike, a trek with a 66cc and an SBP shift kit...57mph top speed.

    I'm making parts for customers, so progress on this project will not be daily. As soon as I finish the crank balancing "how to" I'll post it up.

    Charged...the speed run will be at a 1/4 mile track, not on city streets.

    Jim
     
  2. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Wow - I did just that. Read the whole thing. I had given up at page 3 or something and just posted to get the short crib notes or the link to hospital photos (hey that's NOT funny).

    Turns out this is an awesome thread. Subscribed!! Carry on.

    PS Sorry about the road pizza mental image.
     
  3. Gator Wrestler

    Gator Wrestler New Member

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    I have seen bicycles do 60MPH. I lived for many years in Enumclow WA. That's in the foot hills of Mt Rainier. There was a yearly race up to Paradise, in Mt Rainier Park. Those bikes just crawled uphill, but comming down they were sometimes puller over and ticketed by state police for exceeding the 55MPH limit! I have been passed by bikes while doing almost 60 and they were going faster than I was.
     
  4. tommyboy1442

    tommyboy1442 Member

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    alright,alright i think the title should say 70 MPH...JIM GOES FOR THE GOLD!!!-lol!!! jim your probably gonna just have to do 100 to quiet everyone down once and for all-lol!!
     
  5. Flight Risk

    Flight Risk Member

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    I would bet with a streamlined bullet at Bonneville 70 could be done, with a china girl engine, but not an upright bike in a 1/4 mile.

    I am wondering if those kevlar belted tires Jim is using will hold 100psi. I would almost be tempted to use skinny road bike tires. Also Jim, I wonder if you want those fenders.

    Rod S
     
  6. Elmo

    Elmo New Member

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  7. Technocyclist

    Technocyclist Motorized Bicycle Senior Technologist

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    96 km/h?... Totally achievable on an HT China Girl...
    and here's proof...

    Unfortunately, i have also burned 3 engines already... :(
     

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  8. stuartracing

    stuartracing New Member

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    Are we not to post a pic. of a bike on someone`s thread????
    Just checkin....
     
  9. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Well for this type of thread, I would venture to say that jim or DV should be the only ones on this one....agreed?
     
  10. NunyaBidness

    NunyaBidness Active Member

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    It would seem to me that, as with most threads, if someone has a pic that relates to the thread at hand in a direct manner, then it would be o.k. To just post a pic with one line that doesn't explain anything or even seem to be related to the thread is only contributing to ones post count, instead of contributing to the thread so to speak.
     
  11. jared8783

    jared8783 New Member

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    i think i just wasted my time reading about whethor this guy is justified in posting a pic
    i wasted my time typing this as well
     
  12. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Yes, you did, let's keep the thread on track alright?
     
  13. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    So, how about an update Jim?
     
  14. Creative Engineering

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    I was really busy this week making a big batch of the new motor mount design...although there is a lot of interest in this thread/project, there is an even greater interest in the motor mounts so I kinda have to budget my time so that I don't end up with a bunch of irate customers.;)

    Today and tomorrow I should be able to get the next post done.

    DV's father passed away recently...he will be visiting family and friends for the next 10 days.

    We are planning on having this bike ready at the end of the month.

    Jim
     
  15. dag_29307

    dag_29307 New Member

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    I am sure I speak for every member of this forum. Our hearts go out to DV in his time of sorrow. Please convey our condolences to him and his family. They are in our hearts an prayers. God Bless.

    Take all the time you need.

    Respectfully,

    Douglas A. Goldner
     
  16. fattboy

    fattboy New Member

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    Well said DAG. I echo your thoughts and condolences to DV and his family.
     
  17. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Thanks for the update Jim.
     
  18. flybytaco

    flybytaco Metal Molding Madman

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    jim I'm verry happy about the pinned and balanced bottom ends!! good luck on this adventure... 60 is a tough number but with time it will happen and all the work you are doing to the bike had my first motor melt down yesterday and slammed a half a piston ring through my protohead dang i like that head better than the new one but like i said I run vp not pump gas and jim if you can stay away from the crowded bearing lower crank the caged style is much better i think i lost a few needles out of that crank yesterday
     
    #238 flybytaco, Apr 11, 2010
    Last edited: Apr 11, 2010
  19. Creative Engineering

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    I expect the engine will be smooth and a lot more powerfull after these machining ops.

    I still have the CNC program for the high comp heads. I can run one in the next batch since you are already tuned for that compression ratio. I plan on using the same one and Sunoco 110.

    I have yet to find a crank with loose needles in the big end...they have all had the standard cage type. 3 PK's, 4 Grubees, and numerous others of unknown origin...all caged.

    Jim
     
  20. foureasy

    foureasy New Member

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    good, the crowded bearings suck
     
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