What size are the valves on a Subaru?

Valve Sizes on a Subaru
The size of the valves on a Subaru can vary depending on the specific engine and model. The Subaru EJ20 and EJ25 Turbo engines are known to have 36mm standard intake valves available in the aftermarket. Additionally, the Subaru EG33 engine, a six-cylinder engine, is mentioned to have a four-valves-per-cylinder design with a bore of 96.9 mm and a stroke of 75 mm.
Valve Adjustment and Specifications
Subaru engines may require valve adjustments from time to time to ensure proper engine performance. The valve clearance specifications for some Subaru engines are as follows:
– Intake valves: 0.20 mm ± 0.02 mm
– Exhaust valves: 0.25 mm ± 0.02 mm
An assortment of 60 shims is available, in 0.01 mm increments, to facilitate precise valve adjustments.
Active Valve Control System (AVCS)
Subaru’s Active Valve Control System (AVCS) is an ECU controlled, hydraulically operated, adjustable camshaft gear that can alter the moment the valves open relative to engine load. Single AVCS adjusts only the intake camshafts, while dual AVCS adjusts both the intake and exhaust camshafts independently.
Conclusion
The valve sizes on a Subaru can vary depending on the specific engine and model. Additionally, valve adjustments and specifications, as well as the presence of systems like the Active Valve Control System (AVCS), contribute to the overall performance and functionality of Subaru engines.

What size is the exhaust valve on the EJ20?

32mm
GSC Super Alloy 32mm Standard Exhaust Valve Set for Subaru EJ20 / EJ25.

Which valves are bigger intake or exhaust?

Fresh air (intake) valves are larger than the exhaust valves, this ensures fresh air replaces as much of the exhaust gasses as possible within the combustion space when the cylinder is recharged. The type of valve shown below is sometimes referred to as a ‘poppet’ or ‘mushroom’ valve.

Are all intake valves the same size?

The valve diameters as well as the lift values depend on many design factors associated with the engine combustion chamber. Typically, for a 2-valve cylinder head, the intake valve head size is taken around 0.35 to 0.5 times the cylinder bore, and in case of exhaust valve, it is between 0.28 to 0.43 times the bore.

How much HP can a EJ25 hold?

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 size is the Subaru EJ25?

The Design of the EJ25 Engine
It has a displacement of 2.5 liters, which is where it gets its name. The bore and stroke of the engine are 99.5 mm and 79 mm, respectively. This configuration provides a good balance of power and efficiency, making it a popular choice for Subaru vehicles.

What size is the intake valve on a Subaru?

Standard Size (34mm Head)

What size valve is the EJ25?

Specifications:

CAR MAKE	Subaru
VALVE HEAD DIAMETER	33mm
ENGINE SPECIFICATIONS	EJ25 SOHC
STEM DIAMETER	5.96mm
VALVE LENGTH	121.7mm

What is intake valve diameter?

The valve diameters as well as the lift values depend on many design factors associated with the engine combustion chamber. Typically, for a 2-valve cylinder head, the intake valve head size is taken around 0.35 to 0.5 times the cylinder bore, and in case of exhaust valve, it is between 0.28 to 0.43 times the bore.

What diameter are Subaru EJ20 pistons?

92.51 MM
GTIN: 00193564088574

Product Series	Professional
Bore Diameter	92.51 MM
Compression Height	33.34 MM
Piston Volume	-17.80 CC
Piston Material	2618

Are bigger intake valves better?

Thinking that “bigger is better” many people install 1.90″ or 1.94″ intake valves in 305 heads. Well, the fact is, larger intake valves in a 305 head will hurt overall air flow of the head, especially under . 450″ lift. Losing air flow below .