New toyota technology

The powertrain compartment of the Toyota Prius contains a lot of sophistication, from the Atkinson cycle gasoline engine to the hybrid transaxle.

Every year, Toyota displays its new technological wonders to the automotive press. Here are three topics of interest for the gearhead in you.

The RAV4's New Engine

Toyota's RAV4 mini sport ute has had a 2.0-liter four-cylinder engine since its inception and this year is no exception. But with the trucklet's new look for 2001, Toyota decided to put a new 2.0-liter under the hood. The engine may not look very different from the outside, but inside it has all the newest Toyota technology. The bore and stroke remain the same at 3.39 x 3.39 in., but power is up 20 percent from 127 to 148 hp. The new Four also runs a lot cleaner. The RAV4 now meets Low Emissions Vehicle standards and the new engine design will permit it to meet the even tighter standards that soon will be required. Let's take a closer look.

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refer : http://www.popularmechanics.com/automotive/new_cars/1266531.html?page=1

New toyota technology2

The block is aluminum (versus cast iron for the previous engine) and it has a structural aluminum crankcase that helps eliminate vibrations. Also aiding engine smoothness is the block architecture. It's a compact design with the water pump chamber cast flush with the front, and the side shaped for bolting on the air conditioning compressor without brackets.

Toyota's "total flow" approach to improved engine cooling means all of the coolant flows in a continuous path around the block, then up to the cylinder head. Toyota (and General Motors) began using this technique several years ago, and now it's being phased into this and other new Toyota engines.

The pistons employ Toyota's new "taper squish" shape. The squish part of that name refers to the rising piston's tendency to swirl the air-fuel mixture for more complete combustion. Another neat engineering feature is the offset crankshaft, which - unlike conventional engines - is located 10mm (0.4 in.) laterally (toward the exhaust side of the engine) from dead center under the cylinder bores (illustration below).

The benefit? This allows each connecting rod attached to the crankshaft to still be at an angle (relative to the cylinder bore vertical centerline) when the piston reaches the top of its stroke. Then, as the crankshaft continues to turn, the rod finally lines up with the cylinder centerline just when the piston's power stroke is developing its peak pressure. As a result, the straight downward force from the piston to the connecting rod to the crankshaft is greater, and the side forces - versus a conventional design - are lower. This reduction in side forces means less friction. Other engines sometimes have the piston pin placed off-center to get a similar effect, but this offset crankshaft design is superior.

New toyota technology

The powertrain compartment of the Toyota Prius contains a lot of sophistication, from the Atkinson cycle gasoline engine to the hybrid transaxle.

Every year, Toyota displays its new technological wonders to the automotive press. Here are three topics of interest for the gearhead in you.

The RAV4's New Engine

Toyota's RAV4 mini sport ute has had a 2.0-liter four-cylinder engine since its inception and this year is no exception. But with the trucklet's new look for 2001, Toyota decided to put a new 2.0-liter under the hood. The engine may not look very different from the outside, but inside it has all the newest Toyota technology. The bore and stroke remain the same at 3.39 x 3.39 in., but power is up 20 percent from 127 to 148 hp. The new Four also runs a lot cleaner. The RAV4 now meets Low Emissions Vehicle standards and the new engine design will permit it to meet the even tighter standards that soon will be required. Let's take a closer look.

updat Next werk

refer : http://www.popularmechanics.com/automotive/new_cars/1266531.html

New toyota technology

The powertrain compartment of the Toyota Prius contains a lot of sophistication, from the Atkinson cycle gasoline engine to the hybrid transaxle.

Every year, Toyota displays its new technological wonders to the automotive press. Here are three topics of interest for the gearhead in you.

The RAV4's New Engine

Toyota's RAV4 mini sport ute has had a 2.0-liter four-cylinder engine since its inception and this year is no exception. But with the trucklet's new look for 2001, Toyota decided to put a new 2.0-liter under the hood. The engine may not look very different from the outside, but inside it has all the newest Toyota technology. The bore and stroke remain the same at 3.39 x 3.39 in., but power is up 20 percent from 127 to 148 hp. The new Four also runs a lot cleaner. The RAV4 now meets Low Emissions Vehicle standards and the new engine design will permit it to meet the even tighter standards that soon will be required. Let's take a closer look.

refer : http://www.popularmechanics.com/automotive/new_cars/1266531.html