Jan 24, 2008

The Unique Dream Houses

Multi Purpose Car ( Amazing )

Jan 23, 2008

Beautiful Nature Wallpaper

Jan 19, 2008

The Cheapest Car in the World - Tata Nano

Tata Motors, Indian car manufacturer presented a new car model, Tato Nano that costs only about $2,500 that makes it the cheapest car in the world. The low price is justified by the absence of air-conditioner, radio or anything else that can make driving in the car at least a bit more comfortable!

Jan 17, 2008

The Most Powerful Diesel Engine in the World!

The Wartsila-Sulzer RTA96-C turbocharged two-stroke diesel engine is the most powerful and most efficient prime-mover in the world today. The Aioi Works of Japan 's Diesel United, Ltd built the first engines and is where some of these pictures were taken. It is available in 6 through 14 cylinder versions, all are inline engines. These engines were designed primarily for very large container ships. Ship owners like a single engine/single propeller design and the new generation of larger container ships needed a bigger engine to propel them. The cylinder bore is just under 38" and the stroke is just over 98". Each cylinder displaces 111,143 cubic inches (1820 liters) and produces 7780 horsepower. Total displacement comes out to 1,556,002 cubic inches (25,480 liters) for the fourteen cylinder version.

Some facts on the 14 cylinder version:

· Total engine weight : 2300 tons (The crankshaft alone weighs 300 tons.)
· Length: 89 feet
· Height: 44 feet
· Maximum power: 108,920 hp at 102 rpm
· Maximum torque: 5,608,312 lb/ft at 102rpm

Fuel consumption at maximum power is 0.278 lbs per hp per hour (Brake Specific Fuel Consumption) . Fuel consumption at maximum economy is 0.260 lbs/hp/hour. At maximum economy the engine exceeds 50% thermal efficiency. That is, more than 50% of the energy in the fuel in converted to motion. For comparison, most automotive and small aircraft engines have BSFC figures in the 0.40-0.60 lbs/hp/hr range and 25-30% thermal efficiency range. Even at its most efficient power setting, the big 14 consumes 1,660 gallons of heavy fuel oil per hour. A cross section of the RTA96C:

The internals of this engine are a bit different than most automotive engines. The top of the connecting rod is not attached directly to the piston. The top of the connecting rod attaches to a "crosshead" which rides in guide channels. A long piston rod then connects the crosshead to the piston. I assume this is done so the the sideways forces produced by the connecting rod are absorbed by the crosshead and not by the piston. Those sideways forces are what makes the cylinders in an auto engine get oval-shaped over time. Installing the "thin-shell" bearings. Crank & rod journals are 38" in diameter and 16" wide:

The crank sitting in the block (also known as a "gondola-style" bedplate). This is a 10 cylinder version .Note the steps by each crank throw that lead down into the crankcase:

A piston & piston rod assembly. The piston is at the top. The large square plate at the bottom is where the whole assembly attaches to the crosshead
Some pistons And some piston rods:

The "spikes" on the piston rods are hollow tubes that go into the holes you can see on the bottom of the pistons (left picture) and inject oil into the inside of the piston which keeps the top of the piston from overheating. Some high-performance auto engines have a similar feature where an oil squirter nozzle squirts oil onto the bottom of the piston. The cylinder deck (10 cylinder version). Cylinder liners are die-cast ductile cast iron. Look at the size of those head studs!:
The first completed 12 cylinder engine:

Jan 16, 2008

Detroit Motorshow 2008

Motorshows in Detroit are the world’s most anticipated every year! 2008 is not an exception! Unfortunately, we don’t have enough skills to talk about any of the new autos in depth. We’ll leave it to the expert magazines and web-sites! What we can do is to share with you some photos of the most stylish and innovative cars from the show!