Tribute to Rex and Solex

Discussion in 'Rack Mounted Engines' started by Hammer, Nov 3, 2008.

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  1. Hammer

    Hammer Guest

    Hi! We called it Rhino HellDiver :shock:

    Front fork mounted engine, chain, and a lot of fun with burnouts :grin:

    Speed is above 50 km/h, top speed still unknown.

    From Russia with love.

    Attached Files:

  2. bluegoatwoods

    bluegoatwoods Well-Known Member

    Pretty cool build you have there.

    I can't be sure, but you might be our first member from Russia. So congratulations.

    We'll see you around.
  3. kerf

    kerf Guest

    Excellent work, you running a gear reduction or just a clutch housing.
  4. Mountainman

    Mountainman Active Member

    look at those happy guys in Russia as they ride that MB THING

    very cool MB --- hello over there

    from -- Mountainman --- on top the mountain in the USA
  5. Hammer

    Hammer Guest

    Reduction 5:1, sprockets 22:54
  6. SirJakesus

    SirJakesus Guest

    It has to have reduction. If you look at the direction the recoil starter pulls the engine it would run in reverse with just a clutch. The wheel sprocket would be too small for direct gearing as well. Neat stuff hammer, I've never seen an engine mounted that way, genius!
    It does look much smaller than I would like though. I like being able to fully extend my legs to pedal along.
  7. Egor

    Egor Guest

    Good looking bike. It has a seat like a early Schwinn Sting Ray from the 60's. I see a lot of those gear boxes on Ebay. Hammer does it pull from a stop on its own? Looks like you are having fun. Dave
  8. Hammer

    Hammer Guest

    No, there are centrifugal clutch.
  9. Privet hammer, love the bike quite similiatr to mine. how do you mount that sprocket on the wheel hub? i would love one of those. there are loads of the gearbox front sprocket and drive sprokets on ebay but cant find a compatible QUALITY hub, sealed bearings etc. how do find that small chain works? also could you please post some photos of the hub.


    im fireball btw :)
  10. Hammer

    Hammer Guest

    Pics of mounted sprocket will be later. Wide pocket quad chain works fine and quite!
  11. JemmaUK

    JemmaUK Guest

    I am liking that a whole lot - the thing that strikes me is that the build is so clean compared even to some of the actual kits on the market.

    I have to say that if that was made into a purchasable kit for a reasonable price I think alot of people would be interested..

    well done and welcome to the forum

    Jemma xx
  12. Hammer

    Hammer Guest

    HellDiver is test-bike, and we got a lot of mistakes here. Next bicycle will be with classic frame, wide tyres, 2HP engine, with silent-blocks. Also we planned to use 3 speed planetary hub on front wheel to make it more comfortable in city and on hills.

    But it's difficult to get some parts here in Russia to make final build and cost of them is too hight. Whole motorizred bicycle will be twice expensive than in US or in UK :(

    HellDiver will be testing in all weather and road conditions to determine how it reliable.

    Video from yesterday 100 km trip:
  13. JemmaUK

    JemmaUK Guest

    There is another option on the current set up... and that is to replace the 4-stroke engine with a piped two stroke motor... which should help solve your problem with hill climbing.

    You mention the 3 speed hub... you might be interested if you have a look on youtube for the Hudspith Steam Bike which uses the same system as your machine but with a single cylinder reciprocating steam engine and water tube boiler over the front wheel...

    Again, I am very impressed with the build

    Jemma xx
  14. Hammer

    Hammer Guest

    Thank you, Jemma!

    Hill climbing is not a problem, I just want to have 3-speed gearbox to move slowly in traffic congestion without pedals :)

    Here are 2-stroke 1.5 HP engine, we were tryed to find 4-stroke, but it was only as trimmer :)
  15. JemmaUK

    JemmaUK Guest

    Find a pipe that will fit that engine and you'll be amazed :) ... the traffic thing is a learned art... basically you have to read things in advance and blip the engine to keep you rolling fast enough that the bike is stable.. the only thing you have to watch out for is idiots who think everyone else on the road has dual circuit ABS... re the brakes by the way.. have a look if you can find some kevlar brake pads.. they will last alot longer and stop you better, although they are snatchy as all **** in the rain

    Jemma xx
  16. Hammer

    Hammer Guest

    Do you mean expansion chamber?

    Next Rhino will have pocketbike disc brakes on both wheels. After disc brakes on my mini sport bike, pit bike and quad I will never back to the v-brakes or drum brakes.
    Last edited by a moderator: Nov 6, 2008
  17. sparky

    sparky Active Member

    I LOVED the video. Flammable liquids + flame = FUN.

    Jemma is right... that is a very clean build. Are you still able to fold the handlebars down on HellDiver?? I only looked at the pics for a second, but it seems like the engine mounts would restrict the folding there.

    And thanks for the tip on kevlar brake pads, Jemma! Mine are wearing down now (much, much quicker than my tires), so I'll have to try those out for sure.
  18. JemmaUK

    JemmaUK Guest

    Yep.. an expansion chamber/tuned pipe are one and the same thing... any TP that is suitable for 30cc engines should fit up to yours and make a lot of difference although its advisable to get a silencer with it as without it it will make *alot* of noise.

    Re the brakes thing... the ones I use are Clarks WRC which come in a set of four pads and holders (the pads themselves can be taken out of the holder and replaced as required)

    As of now those brake pads have done about 800+ miles and are well up to stopping the bike at speed in a fairly good distance..

    A good tip when using such pads in the rain... DO NOT use the front brake first, you will get snatch and most likely bounce off the road surface.. use the rear ones at first and then the front brakes... for some reason while normal pads get weaker in the rain... kevlar based/impregnated ones get a *lot* stronger and harsher...:shock:

    Jemma xx
  19. Hammer

    Hammer Guest

    I may loose bolt on handlebars to fold it. Yes, bike is still foldable.

    Thank you for answer! Will it reduce engine resource?
  20. JemmaUK

    JemmaUK Guest

    Im not sure what you mean by that... a tuned pipe/RC increases power by creating an inverse pressure wave that resonates with the rpm of the engine in such a way as to create a pressure lock at the exhaust port and stop blow-by of fuel mixture between ignition strokes...
    It increases engine power in its active range (most pipes are tuned to a given range.. to provide either low, middle or high RPM assistance) although there will be a given amount of boost in all engine ranges.

    The downsides are it does make a substantial difference to fuel consumption if the engine is used high-RPMs for long journeys and an unsilenced pipe is *very* loud. For example.. my bike pre pipe would be flat out at 28-30 mph depending on conditions - now its cruising at 29-30mph with less than 1/3 throttle..

    The thing with your build is that you will need to choose a slimmer type of pipe since the bike is foldable or route it in such a way as to retain the folding capability.

    Important: Pipes are affected by the length of their manifold... this is generally used in model aircraft to tune the RPM range at which it will affect the motor. It is entirely possible to have a manifold reshaped but it is advisable if at all possible to keep the same length of manifold - only extending it if you really have no other choice... for example if the adjustments made are too extreme.. the engine may be providing peak power at idle (which is no good) or on the obverse providing peak power at 500RPM more than the engine actually manages..