Diesel Engines and Conversions

Discussion in 'Motorized Bicycle General Discussion' started by twowheeledfox, Apr 27, 2010.

  1. twowheeledfox

    twowheeledfox New Member

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    Has anyone thought of making a diesel motorbike? It would seem that an aircooled, single-cylinder diesel motor on a husky steel frame with a sprung seat and headlamp would make the ultimate "reliable" build.

    It could be done with an HF motor, they seem to sell 2 and 4-stroke diesels, but another possibility could be a conversion of a two or four-stroke made for gasoline. Of course for many of us this would mean the Chinese 2-stroke kits (or HTs). I am familiar with how diesels work, and a cold diesel would be impossible to use or even start on one of these bikes, but a hot diesel could possibly be feasible. On the slanthead or higher compression 60cc HTs, the compression seems to be somewhere between 6:1 and 8:1, and a hot diesel with a glow plug could possibly skimp by on 7 or 8:1 compression. I've seen it done on older cars before.

    Anybody have interest of experience with this? I'm fairly intrigued by it, and think of the benefits it would have- high reliablity, immense (well, relatively) torque, the ability to run on any fuel- important things to the survival-type builds and builders all over this community. It would be great if someone had already gotten into the idea stage on this at least.

    PS- Purpose-built motorcycles have already been modded to run on diesel. See www.dieselbike.net
     
  2. civlized

    civlized New Member

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  3. NunyaBidness

    NunyaBidness Active Member

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    That would be really nice converted to run on bio fuel. Nobody could complain about your exhaust fumes, unless they're saying it's making them crave french fries.
     
  4. palmclub

    palmclub New Member

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    civil,, hey look in E-bay someone from mich has those same diesels for sale at 373 free shipping look under antique moters or hit and miss moters
     
  5. mountain80

    mountain80 New Member

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    Look at the weight 70 lbs shipped, definitely need to reinforce the frame perhaps?
     
  6. palmclub

    palmclub New Member

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    heres the sitehttp://cgi.ebay.com/NEW-4-5HP-Diesel-Engine-E-Start-GO-KART-MINI-BIKE-/180499501638?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item2a069bd246
     
  7. meowy84

    meowy84 New Member

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    I like the idea of the diesel myself. But diesels are usually heavier than comparable gas engines due to the necessary bulkiness of the engine parts. Just not sure if the converted china engines would be feasable without heavier duty parts, at least the con rod.
     
  8. twowheeledfox

    twowheeledfox New Member

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    I was thinking that the HT would need a new head, cylinder, piston, conrod, and maybe crank. The electrical system would have to be modified as well. I don't know enough to tell whether or not the other HT parts would be too stressed by the conversion.

    What would be nice is if, while we are modding these motors one of us could do a belt drive conversion, ie place a similarly-sized belt drive sprocket (is that what belt drive wheels are called?) on the output shaft of the HT and have a cheap belt-driven motor with a clutch, another thing to think about.
     
  9. civlized

    civlized New Member

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    Thanks palmclub and Ted. I might have to order one of these.
     
  10. Ted

    Ted New Member

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    Something to find out about, CVT like to work at a given RPM and can be adjusted to work within that RPM, if you can find out where that little diesel had it's torque peak and find out if the CVT can be adjusted to that RPM, I had a Honda 250 Elite scooter and it would hit a preset RPM on take off and stay there, that thing was quick, it would leave most bikes and all cars setting there woubndering what's going on.
     
  11. ferball

    ferball New Member

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    As far as converting a chinese two stroke to diesel, I doubt it is possible, none of the compnents are heavy duty enough to handle it, I believe GM tried retrofitting gas to diesel engines back in the seventies, and that involved attaching copious amounts of steel to the existing engine, and still did not work safe and reliable. So I realy doubt the little china doll could handle it. However it is common to see diesels converted to gas in for high performance applications, couple of my buddies did an old VW rabbit to race it. But I would love a diesel bike engine that would be sweet, the electrical would be simplified, no need for a spark, but you would need to address the issue of pressurizing the fuel i believe.
     
  12. palmclub

    palmclub New Member

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    you know,, this mornin my kid hit the nail on the head ,, do a rear mount with your homemade mount nice and strong, one reason its very wide so you can offset the moter to work out with alinment and who knows what kind of gearin is going to work might need a countershaft or addapt a Q - matic
     
  13. shearbf

    shearbf New Member

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    I just looked at the motor. WAY cool little thing. Would not be for a bike for me, but a little wood hulled antique boat replica?
     
  14. palmclub

    palmclub New Member

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    my kids new diesel
     

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  15. palmclub

    palmclub New Member

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    Civlized,, well we did it what a hoot i think it,ll work for my kid cause hes a big strong boy but maybe trkes are were this big diesel well work the best,, its very top heavy but my kids got a smile ear to ear,, did i say hes a diesel mc. so hes in diesel pig heaven check the pic out
     
  16. john_the_great

    john_the_great New Member

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    I think it would be a good experiment, get a high comp head and then run the fuel through right next to the exhaust pipe, and then run glow plugs for starting.... Diesel has lubrication quality so you might not have to even mix oil... If it didn't blast the con rod in half it would prolly work.
     
  17. civlized

    civlized New Member

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    That's cool. I love the big smoke stack. How does it run? I've been thinking of a small bike car with 4 wheels and seats two. Do you think it would pull it ok? Thanks for doing that and sharing, palmclub.
     
  18. palmclub

    palmclub New Member

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    ya it,ll do good, for anything its a well made diesel very powerful ,, i cant believe how much moter it is for the buck,, ele. start, glow plug, all the bells and whistles for 373 del. what a deal i got a vidio of it i could send it to your cell phone its a crack up i cant figure out how to put a vidio on this forum but give me a pm if you want and i,llsend u a qick vid Poul
     
  19. rohan3ni

    rohan3ni New Member

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    i guess nothing cheap lol. im interested lol
     

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