Forged Pistons for Subaru, EJ25 DOHC, 100mm, 8.5:1 (CP Pistons SC7410)
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|
Make |
Subaru |
|
Model |
EJ25 DOHC |
|
Part Number |
SC7410 |
|
Cylinders |
4 |
|
Bore (in) |
3.937 |
|
Bore (mm) |
100 |
|
Size |
+0.5mm |
|
Stroke |
79 |
|
Conrod |
131.25 |
|
Comp Height (in) |
1.193 |
|
Comp Height (mm) |
30.3 |
|
Dom/Dish CC |
-21.8 |
|
Compression Ratio |
8.5 |
|
Weight (Grams) |
397 |
|
Pin (mm) |
23 |
|
Rings |
RS1616-3937-0 |
|
Ring Thickness |
1.2 x 1.5 x 2.8mm |
|
Pin included (Standard) |
905-2500-18CP1S |
|
Upgraded Pin |
905-2500-20CP3S |
|
Ultra Duty Pin |
905-2500-26CP3S |
|
Locks |
905x055 SUB |
CP pistons are compatible with oversized valves and high lift camshafts. CP Pistons represent the highest quality and is engineered for maximum power. Standard features include: Deep valve reliefs accommodate high lift camshafts; Larger valve reliefs for +1mm valve sizes; Custom skirt cam and barrel design; Accumulator grooves; High strength aluminum forgings; High performance rings; Fully CNC machined and balanced to +/- 1 gram; Wrist pins included at no additional cost; Double pin oilers force fed from oil ring groove; Pin lock grooves for easy lock removal; Pin fitting included.
| Product Name | Forged Pistons for Subaru, EJ25 DOHC, 100mm, 8.5:1 (CP Pistons SC7410) |
|---|---|
| Brands | CP Carrillo |
| Engine | EJ25 |
| Make | Subaru |
Delivery & Freight
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended bore clearance for the SC7410 pistons?
For the SC7410 pistons, a typical bore clearance is around 0.0015" to 0.0020". However, it's essential to confirm this with your specific engine build and ensure proper fitting during installation.
What compression ratio can I expect with the SC7410 pistons?
The SC7410 pistons provide a compression ratio of 8.5:1 when used in an EJ25 engine. This ratio is suitable for moderate boost applications, but final performance will depend on tuning, fuel quality, and other engine parameters.
Can I use these pistons with upgraded valve sizes?
Yes, the SC7410 pistons feature deep valve reliefs designed to accommodate oversized valves, including +1mm sizes. This allows for enhanced airflow and performance when paired with high lift camshafts.
What type of wrist pins are included with the SC7410 pistons?
The SC7410 pistons come with standard wrist pins (part number 905-2500-18CP1S) included at no additional cost. Upgraded and ultra-duty pins are also available for those seeking additional strength.
Do I need to machine the piston skirts for my build?
While the SC7410 pistons are fully CNC machined and balanced, it's advisable to check the skirt clearance against your cylinder bore. Some builders may choose to further customise the skirt for specific applications, depending on their engine setup.
