"Dhampir" motorized bicycle project

Avenger-Fighter

New Member
Joined
Oct 14, 2017
Messages
10
Good day to all! For a long time I wanted to post my topic on this forum.

First, by the name of this monster. What is a dhampir? We open google and find something like this: "Dhampir is half human, half vampire." Dampires is generally portrayed as one with all or most powers of a vampire, with few to no disadvantages."
If it is easier, then the concept of this bike is simple. Ideally, it should take the best from both kinds of transport and, if possible, not have their disadvantages. From bicycle - size, weight and the ability to ride pedals. From a light motorcycle - the dynamics of acceleration and cruising speed. All this - with weight and dimensions, under which it can be stored in the apartment. Of course, because is a single-speed engine, the ideal "balance" between "bicycling" and "motorcycling" is impossible. With a big rear sprocket we get a lot of traction, but a small speed. With the small rear sprocket - a high speed, but much less acceleration dynamics.

And therefore, in more detail on the engine. It is a two-stroke water cooling engine from ktm sx 50 dirt bike. A resonator tuve was welded now. And rotor of the water pump is made on the CNC. For the engine were purchased two radiators from KTM SX 65 and 19mm Dellorto PHBG carburetor.

045-1dz3BMYYoDE.jpg

055-FveEueQVsrE.jpg

IMG_3831.JPG

IMG_3801.JPG

IMG_3832.JPG


The frame of this bike was welded from a thick-walled steel profile. Main part (top, down and seat tubes) - from 50x50x3mm square tube, and for chain and seat stays - 40x20x2mm tube. Weight of a complete frame is 16kg. Weight of a complete bike is 56kg.

Canon PowerShot A530_20170905_225128.jpg

IMG_2451.JPG


Canon PowerShot A530_20170924_200931.jpg


Canon PowerShot A530_20171011_032553.jpg


IMG_3829.JPG


The head tube, the bottom bracket shell and top of the seat tube is made from steel on a lathe. Saddle - lepper primus.

029-bN7Kd0ZWdCE.jpg


027-7tbXd8hCIxA.jpg


Canon PowerShot A530_20171008_201716.jpg


IMG_2509.JPG


IMG_2497.JPG
 

Attachments



Avenger-Fighter

New Member
Joined
Oct 14, 2017
Messages
10
Fork - a Marzocci Monster 2003 in good condition.

IMG_3763.JPG


IMG_3764.JPG


Wheels based in a Sun Ringle MTX39 rims and DT Champion spokes. Front hub is Chosen 20mm hub, but rear hub is self made from steel an consist four bearings (total number of bearings is six, two in a drum). Tires is a Kenda Nevegal 2.7.

Canon PowerShot A530_20170913_212036.jpg


Canon PowerShot A530_20170928_003229.jpg


Canon PowerShot A530_20170928_020115.jpg


Gas tank from pitbike.

010-ryptGxRa4lI.jpg


And finally, brakes. Hope M6 is front and Hope M4 is rear brakes.

IMG_3810.JPG


With a 11t front and 60t rear sprocket maximum speed around 65 km/h.

Remade pipe

IMG_3897.JPG


IMG_3896.JPG


6-RmEfJcl98.jpg


ZwVvR9cgrNE.jpg


Dz9e98RHwu4.jpg


Due to the fact that this bike was originally assembled in the enduro style, I do not need a big maximum speed, and a 77-tooth rear sprocket has already made, which will give maximum traction for off-road.

Videos:



 

FurryOnTheInside

Well-Known Member
Joined
Sep 23, 2013
Messages
3,425
Marzocchi Monster T :D weighs like 8 kilograms, about the same as a whole road bike. I used to have one, and I miss it. :oops: The 40mm stanchions feel so solid and the open oil bath damping is sooo plush. :D
Have you done much to tune it to the heavy bike and the rigid rear frame? 190mm travel is a bit much to match zero travel on the rear. Have you changed the springs to heavier ones or used a custom shim stack? What about the oil? 7.5wt is the standard in Marzocchi forks and it can be blended with 10wt or 5wt to change the damping. :)
 

Avenger-Fighter

New Member
Joined
Oct 14, 2017
Messages
10
Big sprocket (77t) are installed. Pipe is again remade for bigger rpm. The dynamics of acceleration has become much better. Max speed around 65kmh.

IMG_3909.JPG

IMG_3906.JPG
 

Avenger-Fighter

New Member
Joined
Oct 14, 2017
Messages
10
Water pump shaft and ignition rotor nut totally destroyed. Pump not rotating((((

IMG_3915.JPG


IMG_3914.JPG


Its construction is so bad. I will think about repairing this part.

IMG_3910.JPG
 

Avenger-Fighter

New Member
Joined
Oct 14, 2017
Messages
10
Hi! My bike is again in working condition! New water pump is installed, new resonance pipe is welded.

Ignition rotor

IMG_3943.JPG


Cylinder after 10 hours of work

IMG_3937.JPG


Old (14mm) and new (15mm) output shaft. New shaft is bought in the USA.

IMG_3938.JPG


New resonance pipe

IMG_3944.JPG


IMG_3947.JPG


Complete bike.

IMG_3953.JPG


IMG_3954.JPG


Video:
 
Top