Wednesday, December 25, 2013
Thursday, December 19, 2013
Monday, December 02, 2013
Both trucks were spotted at Largo da Epatur, in Porto Alegre, Brazil.
Wednesday, November 13, 2013
Saturday, October 19, 2013
There is still no water-cooled flexfuel motorcycle commercially available, altough that would improve the thermal management significantly. Another critical aspect with the current generation of flexfuel motorcycles is the usage of pressed-steel fuel tanks, more sensible to the ethanol corrosive effect than plastic-moulded tanks currently widespread in cars. But, as a trend which started just recently, it's already proven as an economically-viable alternative to decrease the usage of petroleum-based fuels...
Tuesday, September 17, 2013
For a long time, Diesel engines have been considered a good option due to their enhanced efficiency over spark-ignition (or older hot-bulb ignition) engines. Initially not so suitable for vehicles due to a poor power-to-weight ratio, further developments reduced this disadvantage in heavy-duty trucks, marine and agricultural machinery.
Since the 70's Diesel engines have been playing an important role in the automotive market, even leading some markets, mostly due to a demand for fuel savings after the oil crisys, but lately its adaptability to alternative fuels without performance changes or compromises to the efficiency while using heavier fuels such as straight vegetable oil in the days when biodiesel was still not taken so seriously.
In the medium-duty truck segment, the availability of spark-ignited engines became hard to justify, altough it still had some supporters in the American market for cultural reasons and easier cold-starts, and in Brazil due to the successful ethanol program. However, in the heavy-duty segments, Diesel prevailed, and it will hardly lose its leadership in a medium to long term...
Some old irons from that era, such as the early Volkswagen Passat (known in the U.S.A. as Dasher) and the Peugeot 504, are often deemed among the best options for experiences with SVO. The higher operation temperatures in the old-school indirect injection layout and the lower combustion speeds lead to a more complete combustion, reducing issues related to glycerin glazing inside the engines...
|That tank between the fuel tank and the air filter is for the DEF|
Alternatives such as water injection at the intake, usually blended with some alcohol (either methanol or ethanol) up to 50% to avoid freezing, are easy to implement and effective in matter of NOx reduction due to the lower exhaust gas temperatures, and instead of just increasing the purchase cost of a new Diesel-powered vehicle or machinery it would be actually providing a pay-off due to the lower fuel consumption. Even pure ethanol can be sprayed at the intake for the same effect, reducing the volume required. Also, due to the enhancement of the combustion process, it decreases the amount of particulate matter and the fuel consumption, making more sense than wasting both the extra fuel required in an engine fitted with EGR or the urea used in the SCR, and keeping the intake manifold cleaner from oily residues brought from the crankcase by its closed vents. The energy input required for industrial processes to meet an increased demand for Diesel fuel and the urea fluid would become lower, and also due to the combustion enhancement some alternative fuels such as pure vegetable oil can be used in a safer way. The DPF is often also deemed to actually have a prejudicial effect regarding respiratory diseases, since the particulate matter oxidized into smaller particles can go deeper into the lungs. Ironically, water+methanol injection was already experienced by Rudolf Diesel himself, altough not being so widespread among OEMs.
Tuesday, August 20, 2013
|Brazilian Army Toyota FJ-40 ambulance|
|It's almost impossible to spot a cash-in-transit van from the Brazilian branch of The Brink's Company fitted with air-conditioner, such as this Mercedes-Benz Sprinter|
Disclaimer: the usage of any of the pictures from this article for any purpose, either commercial or educational, without authorization from the author is a copyright infringement. All rights reserved to Daniel Girald.