Possibly the world’s most extreme motorbike ever?

Rewriting the book on extreme motorbikes…


Very few engines evoke more feelings of power, sound and emotion than a V8. EISENBERG Racing have pushed the boundaries of madness, by creating an extreme V8 for our most serious project to date. The worlds most ‘powerful and lightest ‘production’ V8 motorbike.

The special V8 engine has been designed in conjunction with some of the top engine designers in the UK to our special requirements. The V8 engine only weighs 80kg and is will be capable of producing 500hp in race spec at 10,500rpm running E85. The ‘road’ version will be just over 420hp to 480hp, according to fuel map.

The V8 engine has been designed to work and fit within a motorbike, as opposed to building a motorbike around a large V8 American muscle car engine, with all the poor handling and weight issues that creates. This bike will be designed without limitations or budget to create a genuine modern day muscle bike, with ‘normal’ weight, length and height.

So, how did we package such a small V8 into a motorbike? Most car V8’s, the ones you associate with ‘American muscle cars’ are a simple crossplane crankshaft design, which gives the typical ‘chevy v8’ burble, due to it’s uneven exhaust pulses. They are also much heavier and bulky by design due to a heavy balance shaft. True light weight race bred V8’s generally have a flatplane crankshaft, which gives perfectly even exhaust pulses – like a Ferrari V8. Flatplane V8’s can rev much higher and easier (often double that of your typical burbly Chevy V8), meaning more HP from less cc (torque x rpm)/5252 = HP. Flatplane V8’s don’t burble, they scream, like an F1 car or Ferrari (also flatplane V8). A flatplane V8 is a more freely revving engine which is lighter, smaller and better primary balanced. But we didn’t stop there. To make it sound really great, the bike is fitted with eight independent fly by wire, throttle bodies with tuned trumpet lengths to give the best possible airflow and throttle response, which is essential for a highly responsive motorbike.

The project has been 4 years in the making so far, with lots of challenges encountered along the way, far more than any of the team had thought. Everything on the bike had to be designed and made from scratch, especially with such extreme levels of ‘every day’ power. The gearbox has taken over 2 years of designing, dyno tested and fitted. (and patent pending.) It is a small, but strong compact gearbox offering 6 speeds, swappable primary gears like a GP race bike, counteracts gyroscopic inertia with a reverse spinning clutch, and the box is also combined with a very rare concentric swingarm design, with carefully designed anti-squat geometry, to reduce chain tension issues, a system proven on the world record MADMAX Turbine bike. This allows a smaller 530 chain to be used and not a far heavier 630 chain that would cause more friction and loss of horsepower.

The bike will achieve its amazing power without any nitrous or turbo, but be naturally aspirated and, will breath through 8 independent Jenvy throttle bodies, controlled by a bespoke ECU offering full ‘ride by wire’, thus allowing ‘regular’ riders to feel the awesome power of the bike without spitting them off by using various menu controlled power maps. Expect top speed and acceleration to be mind blowing and like nothing experienced outside of the best land speed racing or quarter mile drag bikes, yet at the ‘flick of a button’, be friendly enough to ride in town or the rain. For very experienced riders, there will be a special ‘red key’, that when activated, will allow full control of the bike without electronic intervention for insane acceleration and top speed – but only for the most experienced riders!

The prototype bike is under going continuous testing on our engine dyno and road testing to ensure the production bike is fit for purpose, especially in terms of clutch feel, handling, gearbox smoothness, ride-ability, engine cooling, etc….

Update 1: Elvington August 2015 – Land Speed Trials: The Eisenberg V8 made its first appearance with Rider Zef Eisenberg achieved 207mph in its first run, with the engine still being run in. The rest of the weekend, the bike performed many more runs, without issues. It was very well received.

Update 2: Prescott – 2016: The Eisenberg V8 with Rider Zef Eisenberg showed how the bike can navigate the tight, twisty hill of Prescott with ease. It was star of the show and well received.

Engineering was paused for over year to allow Zef Eisenberg the bike founder to recover from his 230mph land speed crash.

Update 3: July 2017 – Motorsport show: The MADMAX Paddock featured the Eisenberg V8 bike along with the best of the best in Guernsey. It was very popular and received keen interest from the biking and car community alike.

Update 4: 2018 – Considerable interest in the bike has been achieved, with people wanting to place a deposit. The bike will cost in excess of £100k and be built without compromise on quality, or specification. If you want the world’s most crazy, superb and powerful road legal motorbike, guaranteed to turn heads, the EISENBERG V8 will do that.

Update 5: May 2019 – Phase 2: To allow the bike to reach limited production, there is considerable amounts of; legislation hurdles to climb over. We have teamed up with Prodrive, one of the UK’s most experienced motorsport engineering companies, to work on taking the bike to production stage and ensure that every part of the bike is fit for ned users, as opposed to racing.  Full testing on safety, durability and duty cycles is now under way. The long road to production is getting shorter.

Update 6: Nov 2019 – Phase 2: The EISENBERG V8 bike has been nominated for the prestigious SIMMS award the RAC club. It has been placed in the centre of the Rotunda to much shock and delight of the press and members.

For further information on updates, PR or getting your name on the waiting list…

please send us an email at: info@eisenbergv8.com

EISENBERG V8 Webpage: eisenbergracing.com/eisenberg-v8

Note: MADMAX and EISENBERG are registered trademark held by Maxicorp Ltd
with the UK and EU patent office across numerous classes.

Latest update – Nov 2019 (Please contact us above for high res media photo’s)