Small diesel engine on bicycle

Discussion in 'General Questions' started by ekramer, May 19, 2008.

  1. ekramer

    ekramer New Member

    Hello: This is my first thread. It's a pleasure being a new member of this group. I have read about the possible existence of a small diesel engine which is suitable for mounting on a bicycle. My internet research has uncovered such a diesel built in the 1940s or 1950s, but which has apparently now been discontinued. Estimates are that this engine is capable of mileage ratings in the neighborhood of 200 - 300 mpg. Is there a modern equivalent to this engine in existence, or under development?

  2. Esteban

    Esteban Active Member

    You probably saw a " Lohmann " engine. I don't know of any diesel kits available, today.
  3. graucho

    graucho Active Member

    Hi ekramer. Welcome to MBc!

    If you search and are unable to find your answers, don't hesitate to post your question. Someone will steer you to a link, or reply to your question. Were here for each other! Enjoy! :grin:
    You may have seen this, but here's a great MBc starter "link" to get you motoring.
  4. sjackson

    sjackson Member

    I have to say that I too looked for small diesel engines and the smallest one I could come up with was the Hatz 1B20. It's a 4.6hp, 243cc diesel that weighs in at about 50 pounds. Northern Tool sells them for quite a hefty price. Not worth it IMO.
  5. ducatiluke

    ducatiluke New Member

    Attached Files:

    Last edited: May 21, 2008
  6. sjackson

    sjackson Member

    That's pretty awesome. Here's some more information about the practica from this page.

    Displacement 18 cm3
    Power output 0,6hp at 6000rpm
    Cycle two stroke
    Compression Variable between 0 and 1:50
    Fuel Kerosene, diesel or vegetable oils
    Weight of bare engine (approx) 15kg
    Cooling Water cooled, air-cooling optional
    Speed control Internal governor
    Power take-off shaft 1500rpm, 1:4 ratio to crankshaft
    Starting Crank
    Power take-off (2, start shaft) 365 rpm
    Specific fuel consumption 300-400gr/hp.h
    Fuel cons. at 0,2hp/5700rpm 0.15 l/h

    Water cooled, eh? hmm... that could make it tricky. I'd love to get my hands on one though.
  7. industrialphreak

    industrialphreak New Member

    practica foundation.

    I've been trying to get in contact with those guys for the last three years or so trying to get one of the engines from them. So far i've gotten nothing back trying five different email addresses with different email content from two different machines. I dont think either these guys check their mail, have a extremely aggressive Spam filter, dont want to communicate in english to an American, or some super secret government agency thats in bed with the oil companies intercepted the communication. either way i am going to immediately wrap various amounts of tin foil around my head. wasnt their schematics on the site for building them?
  8. justinsidethegates

    justinsidethegates New Member

  9. happycheapskate

    happycheapskate Active Member

    Bump. A related thread (about biodiesel, with some interest in micro diesel bicycle engines) brought me here by google search.
    Rumour is the Practica company abandoned their microdiesel project (the one seen in the popular Youtube video, but today, this link was still working

    I really hope someone gets it together with a bicycle-specific micro-diesel engine. I would like to have one. At this point, diesel fuel is higher in price than gasoline (seems odd to me, esp with "bio diesel" being sold which includes all kinds of fillers and organic waste products). Still, a very durable and pleasant to operate diesel bike engine would be a wonderful idea, esp in some countries where diesel is more practical to buy, or where gov. exemptions exist/are drafted for motor bicycles.
    Last edited: Feb 15, 2012
  10. happycheapskate

    happycheapskate Active Member

    Here is a youtube video showing one, built, and running (powering a bicycle stationary trainer).
    Home Built Diesel Bicycle Engine FEATURES:
    - capacity: 38 cubic cm
    - power: without oil pump, injector, spark plug, 2-stroke carburettor.
    - compression ratio 80 kg per square centimeter
    - 5000-7000 RPM full speed
    - 50-60 km with a consumption liters of diesel
    - max speed 50 km per hour.
  11. happycheapskate

    happycheapskate Active Member

    Here is one of the original Lohmann engines, running! From the translation, it says it has a spring operated valve. I am not sure if this means a pressure actuated exhaust valve, or something to do with carbs.

    Here is one a motorcycle engineer built in his shop.

  12. Abhay

    Abhay Guest

    Can My Bicycle Be Modified Like That . If Yes Then Tell Me How Much It Will Cost Me . Contact Me - 9779734678
  13. theres a propane bike kit I seen a few years ago
  14. skyash

    skyash Active Member

    Can you raise the compression of a 66cc and put a glow plug in in stead of the spark plug like a rc nitro car I think thay run 85 present Diesel 15 percent nitro .I have put rc fuel straight in my 66cc it keep revving higher and higher till I picked up the bike and threw it like ten feet and ran away crazy
    zippinaround likes this.
  15. KCvale

    KCvale Motorized Bicycle Vendor

    I say that unless you are pretty much get Diesel fuel free where you live and have a shop for total customizing a mount, this is not a good thing to pursue, espeically for MPG,!
  16. Steve Best

    Steve Best Well-Known Member