Valve Clearance of the Subaru EJ25
The valve clearance for the Subaru EJ25 engine varies slightly depending on the specific model and year. However, based on the information available, the valve clearance for the EJ25 engine is typically as follows:
– Intake Valve Clearance: 0.006 to 0.010 inch
– Exhaust Valve Clearance: 0.008 to 0.012 inch
It’s important to note that the valve clearance specifications may differ slightly based on the specific model and year of the Subaru EJ25 engine. Therefore, it’s recommended to consult the specific service manual or documentation for the exact valve clearance specifications for a particular vehicle.
If you have any further questions or need additional information, feel free to ask!
Contents
- What is the spec of the EJ25?
- What happens if valve clearance is too big?
- Do Subarus need valve adjustments?
- How much is too much valve clearance?
- How much HP can a stock EJ25 handle?
- What is the valve clearance of a Subaru 2.5 engine?
- What happens if valve clearance is too little?
- What is the recommended valve clearance?
- Is too much valve clearance bad?
- What is the weakness of the EJ25?
What is the spec of the EJ25?
The EJ25 engine has impressive power ratings, especially in the turbocharged version. The EJ25T produces 305 horsepower and 290 lb-ft of torque in the WRX STI model. The non-turbocharged version produces 170 horsepower and 174 lb-ft of torque in the Legacy and Outback models.
What happens if valve clearance is too big?
Too much clearance causes the intake and exhaust valves to open late, impacting performance a bit. It also causes the valves to slam onto their seats, causing unnecessary wear.
Do Subarus need valve adjustments?
The FSM has an extensive write-up for checking and adjusting cam clearance as well as for determining the correct shim thickness. In the PDF’s opening paragraph, it mentions that the valve clearance “does not require inspection and/or adjustment until 105,000 miles.”
How much is too much valve clearance?
On the intake side, if the clearances are too high(More than . 013″), then the valve won’t open all the way. This causes the engine to run rich, which will damage your catalytic converters over time.
How much HP can a stock EJ25 handle?
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 the valve clearance of a Subaru 2.5 engine?
The valve clearance specifications for these engines are: Intake valves 0.20 mm ± 0.02 mm. Exhaust valves 0.25 mm ± 0.02 mm.
What happens if valve clearance is too little?
Effect of valve clearance： If the valve gap is too small, the valve is held up after being heated, so that the valve opens early and closes late, or even can’t be closed. The valve and the valve seat do not cooperate closely, resulting in valve leakage.
What is the recommended valve clearance?
Opinions may vary between piston and valve manufacturers, but a popular consensus is a minimum clearance of . 080-inch for the intake and . 100-inch for the exhaust. The exhaust valve expands more due to heat from combustion, and therefore needs additional clearance.
Is too much valve clearance bad?
Too much clearance causes the intake and exhaust valves to open late, impacting performance a bit. It also causes the valves to slam onto their seats, causing unnecessary wear.
What is the weakness of the EJ25?
The biggest downfall to the EJ25 is the cast pistons and small ringlands. Others occasionally have spun bearings but that is much less frequent.
