Chainsaw Bike

Suzzan
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Chainsaw Bike
« on: June 06, 2009, 01:17:24 PM »

This bike is powered by 24 Dolmar chainsaw engines...

Watch it here: http://www.youtube.com/watch?v=DDWqJe1dCgY&feature=related

« Last Edit: June 08, 2009, 01:49:33 PM by Suzzan »

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Speed doesn't kill. The sudden stopping does.

yubaraj
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Re: Chainsaw Bike
« Reply #1 on: June 06, 2009, 01:21:37 PM »

thanks Suzzan,

I never saw this kind of bike anywhere though quite innovative but the riding position seems quite awkward. I remembered caterpillar looking at this bike hehehe

thanks again Suzzan

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Aparichit
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Re: Chainsaw Bike
« Reply #2 on: June 06, 2009, 05:51:33 PM »

Really a good bike And great piece of work

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swarna
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never ride like there's no tommorrow!!!

Re: Chainsaw Bike
« Reply #3 on: June 06, 2009, 05:58:37 PM »

nice info bro..
similar kind of technique are used in nepal too..
in different parts people use bike motor as a water pump kin of thing...

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Bijay Bhai
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Re: Chainsaw Bike
« Reply #4 on: June 06, 2009, 06:29:48 PM »

Massive bike bro.Anyways nice find out there.Do you have the specification list for this monster?

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Raiphang
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Re: Chainsaw Bike
« Reply #5 on: June 06, 2009, 08:03:40 PM »

Never seen such a bike before!!!!!!

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Suzzan
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Re: Chainsaw Bike
« Reply #6 on: June 08, 2009, 12:12:55 PM »

Alrite everyone some more infos regarding the chainsaw bike:

The engine

Its 24-cylinder 2-stroke power plant. Nothing quite like it has been seen before. The combined power of 24 DOLMAR chainsaw engines is fed into to a 5-speed Harley-Davidson transmission by a series of twelve toothed belts.
The engine in question is the one used in the PS-7900 professional chainsaw, which currently boasts the best power-to-weight ratio of any professional petrol chainsaw in the world – just 1 kg per PS. In standard trim each of these high-performance air-cooled 79 cc units generates 4.6 kW of power (6.3 PS) at 9500 rpm. A specific output of 59 kW per litre is outstanding for a chainsaw, and the secret lies in DOLMAR’s High Performance Combustion (HPC) technology. This term refers to the special design of the six gas exchange ports in combination with the asymmetrical combustion chamber head and the crankcase configuration: the result is a highly efficient combustion cycle with low exhaust emissions.
For use in the Dolmette the engines were tuned and tweaked to deliver 5.2 kW of power (7.1 PS) at 10,000 rpm. Maximum torque delivery is 5.5 Nm at 7,750 rpm. When all 24 are combined, the result is a 24-cylinder power plant with a total displacement of 1.9 litres, a power output of 125 kW (170 PS) and 130 Nm of torque at the centrifugal clutches.

The combined power plant

The heart of the combined power plant is the central drive belt casing of aluminium construction. As well as encasing the eleven belts used to couple up the individual engines, it also houses the exhaust ducts for the cooling air. Twelve engines are mounted in two rows of six on either side of the drive belt casing. Each engine is held in place by means of two threaded studs that normally serve to secure the guide bar to the chainsaw power head. The individual motors are coupled together in sets of three by means of a double-sided drive belt, making up eight modules in all. The individual engines are not rigidly connected; instead they deliver their torque through the centrifugal clutch that is a standard feature of every chainsaw.

Through a sequence of three more toothed belts the power of the eight modules is transferred to a single output shaft, which in turn drives the clutch for the 5-speed transmission via a twelfth belt. The toothed belt drive also serves to gear down the speed of the high-revving chainsaw engines in the ratio 3.45 : 1, producing a manageable maximum of 4,500 rpm at the transmission unit. The friction loss that is inevitable with belt drives is less than 10%, which means that the maximum torque available at the transmission input shaft to power the bike is a massive 400 Nm.
As a consequence of the non-rigid coupling of the individual engines via their centrifugal clutches, the combined power plant has a self-determining – i.e. totally *Spoiler*m – firing sequence. In this case, because of the way a 2-stroke engine works, there are 24 ignition points during each engine revolution, or roughly one every 15º. In other words, this power plant fires four times more often per revolution that a 12-cylinder 4-stroke engine!

The chassis

The central element of the frame is the self-supporting drive belt casing with an overall length of 2,495 mm. Bolted onto this is the front section of the frame, constructed from 32 mm tubing. Sitting in the steering head is the Techno Plus front fork, machined from the solid, with telescopic dampers. The bolted-on back fork assembly is likewise constructed from 32 mm tubing and accommodates the back wheel with no suspension travel. The back wheel is a massive 8½” solid disc wheel fitted with a 240/40 × 18” tyre. At the front is a more conventional 3½” aluminium spoked wheel shod with a 120/90 × 18” tyre.
The fully assembled bike measures 3,870 mm from front to back and is 590 mm wide. As the power plant is largely built from aluminium and magnesium, and consequently weighs a modest 188 kg despite its 24 cylinders, the overall weight of the Dolmette has been held down to a touch over 300 kg. This has resulted in a very favourable power-to-weight ratio of just 1.8 kg/PS.

A machine that goes this fast also needs to stop fast. The front wheel is fitted with 292 mm twin disc brakes with 16-piston calipers. The back wheel has a single 292 mm disc teamed with a 4-piston caliper

Source: http://www.dolmar.com

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swarna
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Re: Chainsaw Bike
« Reply #7 on: June 08, 2009, 09:48:04 PM »

nice info bro....keep it up!!
safe ride!!

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darksoul3374
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If U rIdE liKe ThErE's No 2MoRrOw..ThErE wOn'T bE

Re: Chainsaw Bike
« Reply #8 on: July 31, 2009, 06:56:25 AM »

nice info bro....

ride safe

merobike.com

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if u ride like there's no tomorrow there won't be...

Aparichit
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Re: Chainsaw Bike
« Reply #9 on: July 31, 2009, 09:20:38 AM »

thanks for the info suzzan bro

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ctwriderz
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Re: Chainsaw Bike
« Reply #10 on: July 31, 2009, 07:41:19 PM »

k ho yesto!!!!!!!! really suprised bro ne k ho sutera chalaune ho ki k ho hehehe.........neway nic info bro thankx 4 sharin

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NIMESH
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Re: Chainsaw Bike
« Reply #11 on: July 31, 2009, 09:10:43 PM »

thanks for d info bro....really gud info...

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safe ride live long!!!!!!

shashwat_rossi
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I am not Ridin fast,Its just that i m flying 2 low

Re: Chainsaw Bike
« Reply #12 on: August 12, 2009, 11:14:00 PM »

thanks for the info..its good ..

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Suzzan
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Re: Chainsaw Bike
« Reply #13 on: August 13, 2009, 07:55:25 AM »

@ everyone

The pleasure is all mine...

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Speed doesn't kill. The sudden stopping does.

A@SHP
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Re: Chainsaw Bike
« Reply #14 on: August 17, 2009, 07:30:33 PM »

how many engine r there in that bike

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