Subaru Forester Dohc

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Subaru Forester Dohc
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The 2010 Subaru Forester comes with the same engine options as the 2009 models. There are two to choose from: the 170 hp Boxer engine and the 224 hp Boxer.

The first engine is 2.5 Liters, SOHC aluminum alloy, 16 valve engine that will give 170 horsepower and 170 lb-ft of torque at 6,000 and 4,400 rpm, respectively. It also has the i-Active Valve Lift System, or AVLS. This is a computer program designed to give the best fuel economy when traveling at low speeds and high performance, aka horsepower, when traveling at highway speeds. This engine is available in the 2.5X, 2.5X Premium, and 2.5X Limited models of the Forester.

The other engine, available in the 2.5XT Premium and Limited models, is a 224 hp 2.5 Liter 4 cylinder engine. It has 16 valves, is DOHC intercooled, and produces 226 lb-ft of torque at 2,800 rpm. This engine also has AVCS, or Active Valve Control System, which works much like the AVLS to control the balance between fuel economy and high performance, while producing the lowest emissions it can.

Both engines are the Subaru Boxer model, which is unique in that the pistons are horizontal. In most 4 stroke engines (which includes the vast majority of cars on the road today) the pistons are upright or in a v shape. By placing the pistons horizontally, they work to reduce vibration in the engine, which in turn makes the engine last longer.

Both engines work hard to strike a balance between power and efficiency, while keeping the environment in mind.

Ronald W Tanner is a contributing writer at SWEngines.com. He writes about Subaru Forester Engine and other industry specific topics.

What You Need to Know About Buying a Subaru Engine

Subaru boasts that its customers love their Subarus. I agree with them, since over the years I have seen Subaru owners fix vehicles that the owners of other brands wouldn't have even considered fixing. In many cases, this is justified since a running Subaru maintains a higher resale value than other vehicles of similar age. Engine failure is the most expensive mechanical job a Subaru owner can face, and I've gotten a number of questions over the years about the best ways to go about replacing different Subaru engines.

 

The Subaru Legacy Engine

The Subaru Legacy engine is perhaps the most commonly repowered Subaru vehicle. Beginning in 1996, this vehicle was powered with the 4 cylinder, 2.5L EJ25 Subaru Legacy engine. While the EJ25 has undergone many changes over the years, it has been faced with one consistent source of failure: overheating. This isn't the fault of the engine, but rather the fault of the cooling system supporting the engine. With its wide bore and short stroke, this just isn't a very heavy engine – there is no way for it to absorb any heat if the radiator, cooling fan, or water pump don't do their job perfectly.

 

On 1996-1998 Subaru Legacys, I recommend you seek out a JDM (Japanese Domestic Market Engine) from a company that offers at least a 9 month warranty. On later model Legacies, you will want to seek out a good used engine with low miles from a wreck, preferably from a company that provides a vehicle history report to verify the miles. The engine should be carefully inspected to ensure that no damage has occurred to the timing cover, which is very brittle and can easily damage cam and timing gears. Many of these engines have been cheaply repaired with used, high mileage heads, and simply aren't the long term solution you're looking for. There are a few specialty Subaru rebuilding companies, but you will probably spend more money than is prudent at one of these places.

 

The Subaru Forester Engine

Introduced in 1998, the Forester has also used the 2.5L EJ25 engine with great success. The high performance boxer has allowed the Subaru Forester engine to maintain a low weight, compact, high performance engine – the best in its sparsely populated class. In 1999, the Forester switched to primarily putting SOHC heads on the EJ25. This was the first SOHC Subaru Forester engine, and in 2000 the DOHC was dropped completely. The SOHC served along faithfully until 2004, when a DOHC turbo engine (the EJ255B series) came out. The DOHC engine is not only more powerful (210 horsepower vs the 165 hp of the SOHC engine), but more reliable.

 

On 1998-1999 DOHC Foresters, you should again seek out a JDM. Your buying strategy on later model engines should again be to find a low mile used engine from a wrecked vehicle.

 

The Subaru Tribeca Engine

 

The Subaru Tribeca engine is the latest in a long line of Subarus. Bigger than the Forester or Legacy, it was introduced originally with a 3.0L engine, the EZ30. In 2008, the 3.6L EZ36 was introduced. It gained 11 horsepower over its 3.0L counterpart. Neither of these engines is currently available through JDM suppliers, and this author doubts they will ever be. Your best best is to purchase a replacement engine from a wrecked vehicle.

 

When searching for an engine supplier, you should keep in mind that there are good suppliers, and bad suppliers – and everything in between. You're not looking for a friend, but someone with the engine you need in the condition you need it in. Make sure you investigate the company's history thoroughly if you haven't done business with them before. You should look for a positive rating from the Better Business Bureau. A lot of people don't realize you should also be looking to deal with a company that provides a free vehicle history report with each engine that they sell. This report isn't specific to the motor, but rather verifies the miles on the vehicle the engine is from at the time of the wreck that took it off the road.

About the Author

You want used engines, not a worn out engine, and there are many companies that will lie to you about the number of miles on an engine just to get your business.

Subaru Hikes Prices on 2011 Forester
There are no major exterior changes to the 2011 Subaru Forester. The big news is under the hood with the new boxer engine on 2.5X models. | September 27, 2010 | Subaru America Inc.

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