Category Archives: Questions and Comments

Stirling engine

A Stirling engine is a heat engine operating by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work.[1][2]

Like the steam engine, the Stirling engine is traditionally classified as an external combustion engine, as all heat transfers to and from the working fluid take place through the engine wall. This contrasts with an internal combustion engine where heat input is by combustion of a fuel within the body of the working fluid. Unlike a steam engine’s (or more generally a Rankine cycle engine’s) usage of a working fluid in both its liquid and gaseous phases, the Stirling engine encloses a fixed quantity of permanently gaseous fluid such as air.

Typical of heat engines, the general cycle consists of compressing cool gas, heating the gas, expanding the hot gas, and finally cooling the gas before repeating the cycle.

Originally conceived in 1816 as an industrial prime mover to rival the steam engine, its practical use was largely confined to low-power domestic applications for over a century.[3]

The Stirling engine is noted for its high efficiency (up to 40% in practice[4]), quiet operation, and the ease with which it can use almost any heat source. This compatibility with alternative and renewable energy sources has become increasingly significant as the price of conventional fuels rises, and also in light of concerns such as peak oil and climate change. This engine is currently exciting interest as the core component of micro combined heat and power (CHP) units, in which it is more efficient and safer than a comparable steam engine.[5][6]

Big Block GMPP Crate Motor

Although GM has been building and selling crate engines to the general public for years, many of its offerings have hardly been what we’d call “High Performance.” Sure, they were good engines. But what they had in quality, they lacked in gusto. Not anymore. GM Performance Part’s (GMPP) newest line of crate big blocks is a classic example of racetrack power transcending to the street. We’re talking about GMPP’s two new big-block Chevy crate engines. Each totaling 572 cubic inches with one for the street and one for the track, or maybe two for the street if you’re not against lashing valves and driving around breathing race gas fumes.

The coolest things about either one of these crate engines is that after you’ve bought one, you don’t have to do a thing, that is, except to drop it in your car and fire it up. They come delivered to your door already broken-in with all the necessary fixin’s to get you under way. There’s very little else you’ll need to buy to make these beasts run. Of course, you’ll need the standard items like fuel and oil, but you won’t have to buy spark plugs or ignition cause it’s already in there. Also, both of these engines come with roller cams; a hydraulic roller in the street engine, and a solid roller in the race engine, so there’ll be no cam break-in needed either. Both engines even come with their own carb that’s already dialed in. Although you may have to adjust it some, depending on where you live and your local weather conditions. But for the money, these things are really hard to beat. And don’t think for a minute that these engines are some old rebuilt Rat motors. Every part used in these beasts is 100 percent new and very heavy-duty to boot.

When GMPP set out to build the baddest crate engines around, they sparred no expense ensuring that the engines would live to fight for a long, long time. To that extent, GMPP equipped both big-blocks with 4340 forged steel cranks and rods. Forged aluminum pistons with full-floating wrist pins were also included, 9.6:1 compression for the street motor and 12:1 on the race version. And both engines have roller cams for power and durability. On top of that GMPP installed a new version of its proven rectangle-port aluminum cylinder heads, and then cast up a special single-plane intake manifold to fit the tall-deck Bowtie Sportsman Gen VI block. And to make sure there’d be no chance of any one of these engines not making the power they claim, GMPP installs its own specially made Demon double-pumper carb and a hi-perf HEI complete with wires and AC plugs.

How to maintain Engine.

There are number of upholstery cleaning agents available. Here I used a spray cleaner from Turtle Wax®. Simply spray evenly on the seat or door upholstery and rub vigorously. Then, wipe it thoroughly with a dry cloth.
If you don’t have an upholstery cleaner, a laundry detergent will work as well. Mix some detergent with warm water. Dip a clean cloth into it, squeeze out well – you want barely moist cloth. Work harder on dirty areas. When you finished, dry out well with a clean, soft dry cloth. I also recommend to check this car seat cushion review i discovered last week.
Be careful with water inside the car – if the water gets into electrical components it may cause problems. Similarly, you don’t want water to get inside your seats or under the carpet – it could cause corrosion, stains and mould smell.

Hard Tyres News

Over A Dozen Fuel-Efficient Diesel Car, Truck and SUV Choices Now Available

Washington, D.C. January 31, 2011; The newest and most advanced clean diesel cars are being showed at the 10-day Washington D.C. Auto Show which opened on last week at the Washington Convention Center and runs through February 6th.

The Diesel Technology Forum (DTF), a nonprofit association that advances the use of clean diesel technology, participated in the auto show’s “Advanced Technology SuperHighway�??, which highlighted the advancements in electric, diesel, natural gas, advanced petroleum, biofuels, ethanol, hydrogen and safety technologies.

Allen Schaeffer, the DTF Executive Director, offered some insight on the new clean diesel autos and some of the highlights of Washington D.C. event.

“Today’s consumers are more discerning than ever – being driven by what’s valuable today and what will be valuable tomorrow. Clean diesel cars certainly fit that bill. The Washington Auto Show puts on display in one location the wide array of fuels and technologies we can drive today and what we’ll be driving in the future – from plug-in electric cars to hybrids and clean diesel cars. More than a dozen choices of clean diesel options are now available for consumers, and on display here.

Volkswagen Group’s entire clean diesel TDI line up is on stage in Washington, including the new Passat TDI, which will be rolling off the assembly line in Chattanooga in just a few months. Audi is displaying the 2010 Green Car of the Year the Audi A3 TDI, along with the refined and powerful Q7 TDI.

BMW’s successful X5 xDrive35d Sport Activity vehicle is on display. BMW’s CEO Jim O’Donnell highlighted the incredible success of their diesel options last year, noting that the BMW X5 enjoyed a 27 percent increase in sales in 2010. But, the X5 Advanced Diesel model sales were up 73 percent. Every one of these vehicles improved fuel efficiency on average more than 20 percent and provided better CO2 performance as well. In fact, nearly one in four X5s sold in 2010 were diesels. Sales of the 335d (diesel) sedan were up 130 percent over 2009. He also committed that ‘you’ll see more BMW Advanced Diesel models from us in the future’.

GM, Ram & Ford Highlight Why Diesel Power Is the Only Choice for Both Work & Play

Heavy-duty diesel-powered pick-up trucks from GM, Ram and Ford on display at the show highlight why diesel power is the only choice for both work and play. They offer incredible Towing performance and payload capabilities while still returning impressive fuel economy. And all three of these options can take biodiesel up to a 20 percent blend.

“Diesel Vehicles Are Better Value Than Gasoline Engines” Carnegie Mellon Tepper Study

In addition, anew study released January 28th by the Carnegie Mellon Tepper School of Business reveals that despite the slightly higher purchase price associated with diesel-engine vehicles, they are a better value compared to vehicles with gasoline engines because of their lower operating costs and higher resale value over time.

The study by researchers at CMU’s Tepper School of Business, underwritten by Bosch, noted diesel’s better fuel efficiency and a residual value up to 30 percent higher than traditional port-fuel injection (PFI) gasoline-powered vehicles.

According to Lester Lave, University Professor and Higgins Professor of Economics at CMU’s Tepper School of Business: “It’s been generally known that diesel vehicles typically post lower operating costs because of their increased fuel economy. But that’s only one element of the equation. Our study considered a vehicle’s initial price and resale value along with other operating and maintenance costs’.â€???

The study, titled “Comparing Resale Prices and Total Cost of Ownership for Gasoline, Hybrid and Diesel Passenger Cars and Trucks” also found that the price differential between a clean diesel passenger car and a traditional PFI gasoline-powered vehicle could be recouped in less than 18 months of driving. In addition, clean diesels deliver on average of 30 percent better fuel economy than their gasoline counterparts. All of this translates into savings for the consumer, Lave said.

Diesel Cars 20% to 40% More Efficient Than Gas Engines

Diesel autosare extremely fuel efficient, typically getting 20 to 40 percent more miles to the gallon than a comparable gasoline engine,” Schaeffer said. “In addition, they have significantly more power than hybrids and electric cars. And the new ultra-low sulfur diesel (USLD) required since December 1, 2010 has decreased diesel sulfur emissions by 97 percent since the 2006 levels.”

In a nutshell, clean diesel cars have the overall best combination of fuel efficiency, power and durability.�??

Diesel Auto Sales Are Growing

Schaeffer said the U.S. auto market provides, huge potential’ for increased diesel auto sales. While almost 50 percent of all new autos sold in Europe are diesel-powered, slightly less than three percent of U.S. cars and lights trucks were diesels.

But diesel sales are beginning to increase in the U.S. by impressive numbers,” Schaeffer said. “Sales of clean diesel cars increased by 37 percent in 2010, while hybrid sales fell about six percent in the same period ( Month over month sales of all clean diesel cars was up 14 percent in December over November 2009, and 18.6 percent over December 2009.”

There are 30 hybrid car choices and 12 clean diesel choices for consumers in 2010, but that number will be growing on both accounts.

In addition, Schaeffer said an increase in diesel care usage would help reduce America’s petroleum consumption. According to officials at the U.S. Environmental Protection Agency, America could save up to 1.4 million barrels of oil per day, an amount equivalent to the oil we currently import from Saudi Arabia, if one-third of U.S. cars, pickups and SUVs were diesel-powered.


The Diesel Technology Forum is a non-profit national organization dedicated to raising awareness about the importance of diesel engines, fuel and technology. Forum members are leaders in clean diesel technology and represent the three key elements of the modern clean-diesel system: advanced engines, vehicles and equipment, cleaner diesel fuel and emissions-control systems. For more information visit