What are the different types of Subaru blocks?

Types of Subaru Blocks
There are several types of Subaru blocks, each with its own characteristics and applications. Here are the main types:
1. EJ Series: The EJ series is one of the most common Subaru engine blocks used in the US. It has been used in many Subaru models and is still prevalent today. The EJ series has undergone various iterations and improvements over the years. Most Subarus on the road today have an EJ engine.
2. FA Series: In 2011, Subaru introduced the F series, which includes the FA engine. The FA engine is a completely redesigned engine that is gradually replacing the EJ engines in Subaru vehicles. The FA series offers improved performance and efficiency compared to the EJ series.
3. Closed-Deck Blocks: Closed-deck blocks were used in the first generation of Subaru EJ20 Turbo engines. These blocks provide increased strength and rigidity, making them suitable for high-performance applications.
4. Open-Deck Blocks: Open-deck blocks are the least desirable and weakest variation. They are commonly found in non-turbo Subarus but have also been used in some turbocharged models. Open-deck blocks have less support space between the cylinder wall and the block, which can limit their power handling ability.
5. Semi-Closed Blocks: Semi-closed blocks are another type of block used in Subaru engines. They offer a balance between the strength of closed-deck blocks and the weight savings of open-deck blocks. Semi-closed blocks have some reinforcement around the cylinder walls, providing improved durability and power handling compared to open-deck blocks.
Please note that this is not an exhaustive list of all Subaru blocks, but it covers the main types commonly found in Subaru engines.
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Which EJ engine is best?

An easy way to tell if it’s an early or later model EJ is by looking at the engine code. The earlier models end in a letter (Like EJ20G for example) while the later ones end in a number (Like EJ205). For performance builds, the most desirable EJ would probably be the EJ207.

What does a Subaru short block consist of?

If you’re looking to replace your Subaru engine, you might be considering a short block. The short block is the lower half of the engine that includes the crankshaft, connecting rods, and pistons. It’s the foundation of the engine and is responsible for producing power.

What’s the difference between a Subaru short block and long block?

Key Differences Between Long and Short Blocks
Short blocks include, and fully assembled, the block, crank, rods, and pistons. Short blocks may include other items such as the camshaft, timing chain, and covers. Long blocks are short blocks with the heads and typically the valvetrain installed.

How much HP can a EJ25 block handle?

300 whp
300 whp:The EJ20/EJ25 engines can handle 300 whp maximum with stock internals with no further modifications other than a proper fuel management tune. 400 whp:We suggest a set of forged AMR pistons and billet rods to safely boost up the engine.

What is better short block or long block?

Long block engines are generally best in situations where your vehicle needs a complete engine overhaul. You’ll get better reliability and performance from a long block vs. a short block.

What is the strongest EJ20 block?

The IAG 950 EJ20 Short Block is the ultimate “weekend racer” block. Built to withstand up to 950 BHP, this is our strongest “Street” short block offering.

What is the most powerful Subaru engine?

Easily the most powerful and most expensive Subaru ever made, the 2019 Subaru WRX STI S209 is also rare with only 209 examples, all sold in the USA. Its EJ25 2.5-liter Turbo SUBARU BOXER engine erupts with 341 horsepower at 6,400 RPM and 330 lb. -ft.

What are the different Subaru engines?

2.0 liter 4 cyl DOHC engine w/ 200 hp and 151 lb-ft torque [BRZ] 2.5 liter 4 cyl DOHC engine w/ 173 hp and 174 lb-ft torque [Forester, Outback, Legacy] 2.0 liter 4 cyl DOHC turbocharged engine w/ 250 hp and 258 lb-ft torque [Turbo Forester] 2.0 liter 4 cyl DOHC turbocharged engine w/ 268 hp and 258 lb-ft torque [WRX]

Which Subaru engine is the best?

Considered “bulletproof,” the EJ22 is often called Subaru’s most reliable engine. It’s a 2.2-liter four-cylinder boxer engine with an estimated life of over 250,000 miles. The EJ22’s many variations were used in some form from the 1990 Legacy’s EJ22E all the way up to the 2001 Impreza’s EJ222.

How do I know if I have a long block or short block?

While a short block assembly is comprised of the engine block with assembled rotating assembly (crankshaft, connecting rods, and pistons), a long block includes assembled cylinder heads and valvetrain and can include additional external engine components.