V-twin juicer powere electric retro bike





If you think that you’ve spotted a strangely old-looking motorized bicycle cruising around the streets of Los Angeles, don’t worry, you’re not hallucinating. What you’re likely seeing is one of two hand-built Juicer e-bike models – both of which harken back to the very early days of motorcycle development, when engines and motors were fixed to bicycle frames. The Juicer 36 is fashioned like a stretch cruiser and the 48 is an homage to the board-track era. Retro styling aside, the stand-out feature for us has got to be the gorgeous battery/motor configuration, that’s been arranged like cylinders of a V-twin engine.
If you’re in the market for a hand-built electric bicycle but the luxury Terminusmodels from M55 cost just a tiny bit more than your budget allows, and Gabriel Wartofsky’s folding e-bike looks a bit too modern in the Gocycle design sense, then perhaps Dave Twomey’s Juicer e-bikes will fit the bill. Designed with a definite nod to the motorized bicycles of yesteryear, and using as many off-the-shelf parts as possible, these custom creations feature classic exposed machinery and something named the EV-Twin.

he first e-bike created by Twomey was the Juicer 36v electric cruiser with a Schwinn-style springer fork, a top speed of 37 mph (59.5 km/h) with no assistance from the rider, and a range of around 10 miles (16 km) at a speed of 20 mph (32 km/h). The Currie-style 1000-watt brushed DC motor was chosen so that the e-bike can remain classified as a bicycle in California. That eye-catching EV-Twin arrangement above the motor is home to a series of 12 Headway 10 amp-hour cells.
“LiFePO4 is a safer lithium chemistry in that they do not combust when they fail,” explains Twomey. “The Juicer 36 has a Signalab battery-management system in theoil-tank area behind the seat-post tube, and a controller, voltmeter, charge-plug and kill-switch in the gas tank.”
There’s a petcock-style 3-way switch between the EV-twin cylinders, caliper front brakes and coaster braking at the rear – which is described as an overrunning clutch and a drum-brake all in one.
The 70 pound (31.75 kg) Juicer 36 is available for custom order at a cost of US$3,000.
The latest design and the new flagship model is the Juicer 48v electric racer. Twomey told us that this model “started as a Worksman Newsboy frame, sectioned and grafted to a loop in order to cradle a Etek-style motor.”
It features a Manta brushed DC electric motor capable of an unassisted top speed of 46 mph (74 km/h), the same striking LiFePO4 battery configuration as the cruiser but increased to 16 Headway 16 amp-hour LiFePO4 cells (increasing the range to around 13 miles/20 km at 20 mph), and EcityPower battery management. The fuel tank is home to a Kelly controller rated at 400 amps (but currently limited to 100), a surface-mounted antique voltmeter, charging plug and ignition-switch.
The custom-made Hydroencephalac forks are based on designs by chopper builderJohn Brain, with rear-facing bicycle-necks


that function as adjustable risers. There’s disk braking at the front, a Y-brake at the rear, and Felt Thick Brick tires on the rims.
“Both Juicers achieve their gearing using a jackshaft,” says Twomey.” The Juicer 48’s jackshaft, however, is a free-coaster hub being used as an overrunning-clutch to reduce drag while coasting.”
The Juicer 48 is not yet up for sale, so no price is available at the time of writing.
Twomey also produces a few t-shirts sporting the Juicer logo, just in case onlookers are in any doubt about who made your cool ride.




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3 Generations of Confederacy -Confederate’s X132 Hellcat "affordable"

Confederate Hellcat III

Birmingham UK may be the birthplace of many an historic motorcycle marque but Birmingham Alabama is where we’ll find Confederate Motorcycles, builder of exclusive “heirloom” machines for the rich and famous. These aren’t custom choppers; not the Bondo-filled multi-lacquered fantasy machines of reality TV fame. These are properly engineered and prototyped limited-production models that in the past have sported prices tags of well over $100K. This time, with the X132 Hellcat, Confederate has created a machine that could almost be thought “affordable” whilst still retaining its obsession with detail and stunning design.

Confederate Motorcycles X132 Hellcat


Named after the legendary F6F Hellcat fighter plane of WWII, the X132 Hellcat is the result of an uncompromising design and manufacturing approach that’s stretched to several years. The centerpiece of this approach is the Hellcat’s billet aluminum case. Instead of the usual casting method, the Hellcat’s case is machined from two blocks of billet 6061 aircraft grade aluminum. But the company’s uncompromising approach does not end with the case.

“Because we design and craft each Confederate motorcycle to be a multi-generational heirloom product, we require that each component, from the carbon fiber wheels to the smallest stainless steel bolts, be of the highest quality, no matter the cost. Our clients deserve nothing less.” says Clay Morrison, the company’s Director of Marketing.

We last looked at the Hellcat’s gradual gestation over a year ago, but now we can see the actual machine in all its glory. We also now know that the customized S&S 132 cu (2.163 litre) V-twin engine will be providing greater than 132 bhp (100 kW) and 150 foot pounds (200 Nm) of torque to push the 500 lbs (227 Kg) bike down the road at some ridiculous speed. The figures hardly seem to matter.

Now the words “affordable” and “production” were mentioned in the title. These terms are relative. Only 150 of the machines will ever be produced and with 43 units already pre-sold, you need to get your 10% deposit in now – the company is set to begin production in January at a rate of only two units per week. Hurry up and wait as they say in the Army. To get things rolling the X132 Hellcat is set at US$45,000 (€33,700) through February 29, 2012. and then the price will rise to US$49,500 (€37,000) on March 1, 2012. Orders may be placed online at workandcycle.com. What are you waiting for?

This isn’t the bike you buy to ride to work or go camping. The street drag-racing attitude is almost overwhelming. This is a once-in-a-lifetime purchase of a machine that is a pure expression of engineering, craftsmanship and design. Scare yourself stupid every now and then, pose outside cafés, and for the rest of the time just bask in the ownership glow of one of the most masculine objects on Earth. 

JAP : The Engine which powered everything that had a wheel


It’s been a long time coming but to the Card family it has never been gone, under the wing of Alec Card


Crankshaft (red), pistons (gray) in their cyli...Image via Wikipedia

who in his lifetime was second to none on the JAP front after acquiring the company some 2 decades ago, 


has built a number of engines – all documented and on the company register. 
However with his

engineering skills and knowledge of what makes things go bang better, the new engine is testament to his

lifetime’s work.

What we have now is exactly what a JAP V Twin would have been in those lost few years of the company.


Unfortunately Mr. Alec Card passed away on the 8th May 2010, but his work and commitment will be carried on by his family

So this great new name and engine will continue to stay in the motorcycle and

three wheel car industry.



ALL NEW JAP TWIN





    HISTORY OF JAP


JA Prestwich Industries, was an English engineering company named after founder John Alfred Prestwich, which produced cinematographic equipment, internal combustion engines (for which the company was generally abbreviated to “J.A.P.”), and other examples of precision engineering.

J. A. Prestwich, an engineer, founded the company in 1895, when he was in his early twenties, initially behind his father’s house at 1 Lansdowne Road, Tottenham. By 1911 he had moved to a new plant at Tariff Road, Northumberland Park, Tottenham. Prestwich came to be known as much for his creation of cinematography projectors as his engines. He worked with S.Z. de Ferranti and later the cinema pioneer William Friese-Greene.
The engines were used in many famous motorcycle marques and other devices, such as early aeroplanes, chainsaws, cultivators such as those produced by Howard Rotovators,and light rail maintenance trucks.The motorcycle engines were associated with racing success and were still used in speedway bikes well into the 1960s. During the Second World War Prestwich produced around 240,000 industrial petrol engines in support of the war effort, together with millions of aircraft parts, fuses, etc
After 1945 production was taken over by Villiers Ltd.and the company was completely absorbed by the Villiers Engineering Company in 1964 just as Villiers itself was to be taken over by Manganese Bronze Bearings.
The company’s engineering works in Northumberland Park closed in 1963.ProductsAircraft engines
Early aircraft were light and basic, and need a reliable and lightweight engine to power them. JAP motorcycle engines were often used in this application. A JAP engine was used in A V Roe’s 1909 triplane, regarded as the first all-British aircraft, and for a while Prestwich and Roe had a partnership. JA Prestwich at first would deliver the same engine to the aircraft manufacturer, allowing them to make local modifications – mainly larger venturi tubes for the carburettor, to allow for greater air intake at altitude.But in the late 1920s/early 1930s JA Prestwich produced various heavier engines under licence, including those for the UK market for Aeronca.Cinema
Cinematographic equipment including cameras, printers, mutoscopes, cutting and perforating machines, and projectors (eg the Bioscope projectors for the Warwick Trading Companyand Charles Urban) were produced by the company in the early part of the 20th century.Motorcar engines
1934 Morgan Super Sport with JAP engine

In light of JAP’s development of high powered but light engines for speedway, some low volume pre-war car manufacturers, including theMorgan Motor Company and Reliant, used JAP engines to power their vehicles.
This use of the JAP extended into motor racing after the Second World War, with most were used in specialist UK lightweight formulas, or more extensively in Formula 3 racing after developments by John Cooper.
In its later life, JA Prestwich also produced components for other vehicle manufacturers, including the cylinder head for the Lotus Cortina and the early versions of the Ford-based Lotus Elan engine.[edit]Motorcycles
From 1904 to 1908 complete motorcycles were produced from the development of the first overhead valve motorcycle engine to be produced in the UK.
After that the factory concentrated on supplying its engines to other manufacturers, including 
Brough Superior,
Triumph Motorcycles,
A. J. Stevens & Co. Ltd, and HRD Motorcycles, 
the forerunner of Vincent Motorcycles.
Machines that incorporated its engines included theAJS Model D, fabricated for the Russians in the First World War.
JAP exported significant numbers of engines to foreign motorcycle manufacturers including Dresch and Terrot in France, and Ardie, Hecker and Tornax in Germany.
Latterly, JAP engines (under Villiers control) were used in motorcycle racing, and most commonly speedway or dirt track

1948 Elstar JAP Grasstrack, National Motor Museum Monorail in Beaulieu 
1950 Rotrax JAP Speedway, National Motor Museum Monorail in Beaulieu



To Have one of these built contact
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The Next GENERATION CAFE RACER –

Mo2or cafe racer bike is a concept design study of what our next generation cafe racer should look like according to the respect of dream specification.

This cafe racer design is actually based on the classic theme but at the same time modern in term of human sitting position and some essence of today’s visual appeal.
This bike uses the 800cc v-twin engine with totally new and different design approach. It’s a perfect blend of classic look with hi-tech technology.


Designer : Rahul Rathore

Mo2or Cafe Racer Design Proposal by Rahul Rathore
Mo2or Cafe Racer Design Proposal by Rahul Rathore

Mo2or Cafe Racer Design Proposal by Rahul Rathore
Click the image above for bigger view
Mo2or Cafe Racer Design Proposal by Rahul Rathore
Mo2or Cafe Racer Design Proposal by Rahul Rathore
To get featured pls Submit A Design‘ feature, where we welcome our readers to 
submit,their-design/concept 
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Royal enfield V-twin

From Aniket Vardhan:
I was born in and lived in Delhi, India till 1999 when I came to the USA – ostensibly for a Masters in Industrial Design, but here’s the dirty truth- I came because of the sound of a Harley Davidson. Saw one once in Delhi, long ago, belonged to some filthy rich type, heard it start up and rumble away, wet myself publicly and resolved that one day, I would visit their homeland.
That didn’t seem likely at the time I was studying architecture in Delhi so the next best thing was to see what I could do with my Bullet, dearly loved as the only real motorcycle available in India back then (and perhaps even now). Thats when the idea was sort of baked into mybrain, in the heat of 115 degree Delhi summers, over cigarettes, the smell of steaming cow dung and chats with biking buddies in the college cafeteria. I would build a V twin Enfield- it should feel right, with its long stroke, heavy flywheel, beautiful cylinder and head. Looked for any and every book I could find on vintage motorcycles, V twins, engine design, metal casting, machining- all of it. Bought an old enfield engine to use as reference.
700cc Royal Enfield V-Twin - The Musket

700cc Royal Enfield V-Twin – The Musket

Jump ahead to 2002. I did in fact find myself in the USA, now an industrial design faculty member at an art and design college. On a trip to Delhi in 03, I picked up my old engine and brought it back Began to work on the idea on weekends, sketching, 3d computer modeling, measuring all internal parts, figuring out how to make the whole thing work using only standard enfield parts. You guessed it – came across the Norcroft V twin Enfield online, sort of destroyed me for a week. Then I figured, this is sort of fun anyway, so lets keep at it. I guess a couple more years passed, about 18 developments of my CAD model later, I was ready to start building patterns, and then, what do you know, the Carberry comes to my attention! By now, I was beginning to suspect that my next door neighbors were working on an Enfield V twin as well. As you’d expect, after a month of depressed moping, it was back to the basement again and I also noticed that my approach was rather different anyway, so why not put forward the way I thought made sense to me? Here is my rationale:
1. Keep it as ridiculously simple as the original Bullet engine. Therefore, no modern updates to major engine internals, so it still has the stock tappets, no hydraulics, and the stock piston oil pumps. Vintage bike lovers really like to tinker and tappet adjustment is almost a religous ritual for many.
2. Improve the oil filter – I machined a new filter housing which uses a standard modern cartridge type filter available at Advance. This is not a screw on car type filter – that doesn’t look right, so I have a finned aluminum housing I made.
3. Aesthetically, and this was very important to me being an industrial designer- keep the “vintage” and “Enfield” cues strong. I thought I would pick up from the last Enfield big twin- the Interceptor. The rounded profile of the front of the crankcase and pleasingly smooth and gently radiused forms of the castings and the cooling fins on the side of the wet sump. A wet sump simplifies matters and also ties in with the last Enfield big twin- the Interceptor Mark 2, which also had a wet sump.
4. I love the external copper oil pipes that are such beautiful visual elements on vintage engines, so I decided to incorporate that as well. This also helps to keep the oil cool as it travels through them, exposed to the air.
5. Keep the frame mods to a minimum and again keep the “vintage” feel going by keeping the single down tube- the Enfield big twins of yore had single down tube frames and handled well. The look of the “vintage V twin” I think is the very simple and elegantly “cradled” engine between two tubes- front sloping forward and rear sloping back.
700cc Royal Enfield V-Twin - The Musket

700cc Royal Enfield V-Twin – The Musket

I ended up quitting my teaching job last year, was getting the feeling that my heart was in projects like this. Since I wasn’t a machinist, I had to learn that too. This is where the stars lined up – a student’s family business is a machine shop close to my home, and his dad, Mr. Boggs was sufficiently amused by the project and my excitement to allow me to come in and start working on my project, early last year.
Well, it took about a year for the machining to get done, I learned everything as I went along and here we are. I have skipped all the “oh darn!” moments but there weren’t too many, just one huge one, when the first foundry I went to pretty much destroyed my patterns built over 3 years by leaving them near an open window in the rain…still get stressed out when I think of that- had to cut away and repair the whole thing after a couple of months of very evil thoughts.
But…the holy rider in the sky must have smiled upon me because from the very first firing, it runs like it WANTS to! It starts first kick every time! It isn’t quite as explosive as my 750 Triumph Bonny, but it has the very mild Bullet cams and stock 7:1 compression and small carbs, so a healthy increase in output can be expected with the usual mods. But, the torque is really lovely- cleanly pulls top gear at around 20 mph (!!) and accelerates from there without any snatching! I’m keen to try the new 5 speed gearbox the new Enfields have – my old one has 1-2-3 really low and a huge gap to top. My final ratio is 4.22 to 1 right now and she feels like she could pull even taller.
The amazing part is that its SMOOTH! It shakes much less than my Triumph and I think less than my old 350 single engine! That second piston is really helping to cut the vibes.
The sound? Beyond my wildest dreams, from those baking hot summer days in Delhi, ten years ago.
700cc Royal Enfield V-Twin - The Musket

700cc Royal Enfield V-Twin – The Musket