While it wasn’t the only car company to make use of a rotary engine, it was certainly the only one to be competitive with them when pistons and pushrods would easily have sufficed. However, those days are gone. Mazda’s SkyActiv technology is well suited for squeezing out an engine’s true potential, but it doesn’t feel particularly quirky or unique.
That could change with the company’s second generation of SkyActiv engines. Mazda is one of only two automakers planning to introduce a motor with homogenous charge compression ignition (HCCI) sometime next year. If you’re unfamiliar, that’s a direct-injection gasoline-powered motor that uses compression, not spark, to ignite fuel — something typically reserved for diesel powerplants. (Read More…)
Hi Sajeev & Steve,
“You have not covered extensively the problems encountered by GDI engines, especially Mitsubishi Dion (the engine is 4G63). As the revs go beyond the 2000 rpm, the ‘check engine’ light comes on, then eventually the engine — if forced — cuts off. After a few minutes, the engine can start but it does not take long before it repeats. I was told by a mechanic to buy a new pressure pump. This was fitted but the problem has not gone away. Please help!”
Ummm… we think your mechanic needs to keep away from Runaround Sue.
Changes are coming to FCA’s HEMI engine family, ranging from increased fuel economy, to higher horsepower.
Looks legit. (photo courtesy: n0str9 @ forums.tdiclub.com)
I have a 2003 Jetta TDI with 178k miles. Runs 100%. My mechanic recommends a carbon cleaning. What are the positives and negatives? To be more succinct, what can go wrong?
You can tune a piano but you can’t tuna fish. (Good to know! – SM)
A new option available to the Toyota Auris today, the automaker debuted the second turbocharged piece of its new engine family.
Aside from rebuilding itself in North America, Alfa Romeo is set to introduce a new family of high-performance engines into the lineup, the first of which will come in the next six months.
Fiat Chrysler Automobiles’ Chrysler Group has big plans for its venerable Pentastar engine family, all in the name of improved fuel efficiency and power.
I read your blog about the problem in BMW. I have a 2009 BMW 535i X drive with turbo. The car just ran out of warranty and has 45000 miles only. My car started having engine problems last week. First, the BMW said it needs new spark plugs as they were dirty. That cost me $740 dollars. That did not work. They said it needs new fuel injectors. That was another $2100 dollars. (Read More…)
Engine downsizing is all the rage. Making the engine smaller increases fuel efficiency, reduces emissions and cuts vehicle weight. With ever tightening fuel economy legislation in the United States and CO2 emissions regulation in the European Union, mainline manufacturers are turning to turbochargers like never before. In 2009 just 5% of cars sold in America sported turbos, and that 5% consisted largely of European brands like Volvo and BMW with a long history of forced induction. By 2013 that number had more than doubled to 13%. Honeywell expects the number to rise to 25% in the next four years and the EPA tells me that by 2025 they expect 90% of cars sold in America to sport a turbo engine. With turbos becoming so ordinary, what’s a turbo pioneer like Volvo do to keep a competitive edge? Add a supercharger of course.
I have a piston slap question for a friend at work. She drives an ’11 Mazda CX-7 2.3. For over a year she has had an issue with fuel in the oil. Enough that the oil level has been as much as 1″ above the full mark on the dipstick as a result (oil level was checked after service, and frequently between services). This is noticed within weeks of service/oil change. (Read More…)
I’ve heard from maintenance shops and oil additive producers that DI engines, especially Audi and BMW, have severe problems with carbon buildup in their valve systems. Might be good to chat about this and also poll readers to see if other vehicles have the same issue. Thank you. (Read More…)
Once upon a time, in a country known as America, SUVs roamed the land with large-displacement inline 6s, optional V8s, and locking axles. Nobody had heard of a “cute ute.” Of course, gasoline was also under a buck a gallon. Today the landscape is different. While the last energy crisis caused entire vehicles to downsize, the response to the latest energy “crisis” (and government pressure) has been to downsize engines while leaving the rest of the vehicle intact. Case in point? The Ford Edge EcoBoost. No, this isn’t the 3.5L fire-breathing twin-turbo you’ve heard about before, this is the all-new 2.0L engine that puts the Eco in EcoBoost.
“Ask an Engineer” is hosted by Andrew Bell, a mechanical engineer and car enthusiast. Andrew has his MASc in Mechanical Engineering from the University of Toronto, and has worked on Formula SAE teams, as well as alternative fuel technologies in Denmark and Canada. Andrew’s column will explore engineering topics in the most accessible manner possible.
TTAC Commentator edgett writes:
I’ve got a 2007 BMW 335 which has a direct injection system. Although I enjoy the car, it has been through three fuel pumps in 35,000 miles and BMW has thankfully extended the warranty on the fuel pump to 100,000 miles and seven years. The benefits, however, are extraordinary. This engine gets excellent fuel mileage and makes fantastic power. So tell me why DI systems are so difficult that mighty Honda has yet to take the plunge! (Read More…)
TTAC commentator cacon writes:
I’m a long time reader, but not much of a poster. Anyway, I currently own a 2009 SEAT Leon (bought new, I’m from Mexico if you wonder how I got this car), which is basically a 5th gen VW Golf in drag, 1.8 TSI engine and 6 speed manual, 32k km in the odometer (about 20k miles) almost 100% of city stop and go traffic. Currently, there’s nothing wrong with the car, but today I took it to the dealership for the vehicle emissions tests (all good) and looking at all the services that they provide I found this: Engine Carbon Build Up Cleaning with Hydrogen, so I ask the service representative what it was, in he basically told me that a machine is connected to the fuel system of the car and they feed it with hydrogen and keep the car running for about half an hour, and that should remove all the carbon build ups in the system.
Reading this and other forums I learned about the propensity of major carbon build in the valves, regarding the direct injected engines, so I found this interesting. Googling this cleaning system, I rapidly found about it: OxyHydrogen Engine Carbon Cleaning, although I just barely read about using it in scooter engines.
Then it came to me!! Ask Master Sajeev about it!! So I’m wondering if you ever heard of this system and if it’s really effective in removing carbon build ups, or if it is a bad idea to ever think about it. Dealership charges about $50 to perform this service by the way….
Saludos desde México!!