Wood Gas - The Future Biomass-Derived Fuel

Let's assume, that you own a farm. You produce grain and have a lot of straw. You'd like to make your energy on site from the biomass you have available. You might plant your fields with rapeseed or canola and produce biodiesel. But you'd need to get methanol and lye first, since both of them can't be made there! And you can use your biodiesel only in compression ignition (diesel) engines. And what if you have an old genset powered by spark-ignition (gasoline / petrol) engine? I think I might have a solution for you...

You'll make use of a technology that's more than 200 years old. It's greatest development took place during World War II in 1940s in Europe. At that time most of petroleum-derived fuels were used by military and there was no fuel left for civilians. So they made their own fuel, the wood gas from wood or charcoal. In some countries 95% of civilian transport (trucks, buses, even fishermen's boats) were fueled with this gas.

What is this wood gas? From chemical point of view it's a mixture of combustible carbon monoxide (CO), hydrogen (H2) and methane (CH4), dilluted with some water vapor, carbon dioxide (CO2) and nitrogen (N2). This gas can be easily used for almost every internal combustion engine. Well... except for the most modern ones, they'd require to have their electronics to be modified.

How wood gas is made? When you heat wood it is pyrolysed, i.e. all the tars vaporize. When you add some oxygen, the carbon bound within the wood cells is burnt to carbon dioxide. The vapors burn too. When those burnt gasses pass through a layer of very hot char, they are reduced to carbon monoxide and hydrogen. A small amount of methane is also produced. When the gas is cooled and cleaned of any tars and particles, it can be used in internal combustion engine, boiler or any other device!

What do you need to produce your own wood gas? You'd need a device that's called gasifier. It consists of fuel hopper, gasifying chamber and a set of filters. It's very easy to build, the people during WWII made it out of old water heaters and stuff like that.

Is wood gas safe? Well, if you don't inhale it, you'll be OK. Carbon monoxide is very toxic and poisonous, so caution is required when using wood gas. From the engine point of view, if it's clean, it's safe. The tars might condense inside the engine, for example on valves, which might cause the engine to fail. The particles would probably destroy the contact surfaces on pistons and cylinders. If the gas is too hot the engine will not work (hot gas is diluted and has small energy content per unit volume), but it will not harm it.

Any drawbacks? One that's worth mentioning. Petrol engines will suffer 1/3 power loss -- the wood gas does have small heating value. Diesel engines will not suffer such power loss, since they work on stratified mixtures and because of that you can introduce more wood gas to recover the power loss. You'd need to leave some small amount of diesel to be injected to the cylinders to ignite the wood gas.

Interested? One liter of petrol / gasoline can be replaced with 2.5 - 4 kg (5.5 - 9 lbs) of wood. How cool is that!

by: Krzysztof Lis

The BWM HP2 Sport

The BWM HP2 Sport is the latest iteration of the Bavarian Motor Company's foray into producing performance driven motorcycles. The quiet, staid, and lets just admit it boring motorcycles that came out of BMW in years past is history.

The HP line is BMW's new high performance, cutting edge line up. It's the motorcycle equivalent of their M line of performance cars.

The HP2 Sport is the third motorcycle in the HP line following the releases of the HP2 Enduro and the HP2 Megamoto.

The HP-2 Sport is based on the R1200S but is out and out designed for sports riders who are looking for a machine that has performance as well as endurance.

The HP2 Sport keeps some of the concepts that BMW motorcycles have become known for such as the BMW Motorrad Telelever front suspension and the EVO Paralever rear suspension. Other components have been newly developed or highly modified for use in the motorcycle.

The HP-2 Sport is powered by a twin Boxer motor that has a capacity of 1170 cc. The engine's cylinder heads were completely redesigned which allows the engine to rev as high as 9500 rpm. The engine has a 101 mm bore and a 73 mm stroke and produces a maximum of 130 hp at 8,750 rpm and 85 lb-ft of torque at 6,000 rpm.

The bike has a close ratio six speed gear box, with first and second gear having higher ratios. This puts the gear increments closer to each other and results in less of a rev drop when progressing up through the gears.

The bike also has a gear shift assistant which allows the rider to shift gears without using the clutch. It works by sensing when the gear lever is activated. If it senses gear lever activation without the use of the clutch, it electronically reduces power to the engine which puts the engine in a low load state and makes it possible to shift without the clutch. If the rider uses the clutch, the system becomes inactive.

The riding position of the HP-2 sport can be described as relaxed. BMW has extensive experience with endurance racing and knows that for racers to be fast over a long period staying power is more important than a full racer's tuck.

The dashboard was developed by 2D Systems, which also provides analytic recording systems to Moto GP racing.

The dashboard has two modes and is switched by two controls on the left handlebar. In road mode, typical information such as speed, rpm, time, and distance are displayed. In race mode data such as top speed, circuit times, number of gearshifts and rpm is shown.

The HP2 Sport will push BMW further into the world of performance motorcycling.