Forged Pistons for Subaru FA20 / Toyota 4U-GSE, 86mm, 10:1 (CP Pistons SC7405)
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|
Make |
Subaru |
|
Model |
FA20 / 4U-GSE |
|
Part Number |
SC7405 |
|
Cylinders |
4 |
|
Bore (in) |
3.386 |
|
Bore (mm) |
86 |
|
Size |
STD |
|
Stroke |
86 |
|
Conrod |
129.3 |
|
Comp Height (in) |
1.292 |
|
Comp Height (mm) |
32.8 |
|
Dom/Dish CC |
-11.4 |
|
Compression Ratio |
10 |
|
Weight (Grams) |
338 |
|
Pin (mm) |
22 |
|
Rings |
CPN2-3386 |
|
Ring Thickness |
1.0 x 1.2 x 2.0mm |
|
Pin included (Standard) |
866-2250-15CP1C |
|
Upgraded Pin |
866-2250-20CP3C |
|
Ultra Duty Pin |
866-2250-25CP3C |
|
Locks |
866x063 SWL |
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 FA20 / Toyota 4U-GSE, 86mm, 10:1 (CP Pistons SC7405) |
|---|---|
| Brands | CP Carrillo |
| Engine | FA20, 4U-GSE |
| Make | Subaru |
Delivery & Freight
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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 SC7405 pistons?
For the SC7405 pistons, a typical bore clearance of 0.0015" to 0.0025" is recommended. This ensures proper thermal expansion and prevents piston seizure under high load conditions. Always verify with your engine builder for specific requirements.
What compression ratio do the SC7405 pistons provide?
The SC7405 pistons have a compression ratio of 10:1. This is suitable for applications that require a balance between performance and reliability, but ensure your tuning and fuel quality match this setup.
Are the SC7405 pistons compatible with stock rods?
Yes, the SC7405 pistons are designed to work with stock conrods, provided the rods are in good condition and properly machined. However, it's advisable to check for adequate clearance with your specific setup, especially if using high lift camshafts.
What is the weight of the SC7405 pistons, and how does it affect engine performance?
The SC7405 pistons weigh 338 grams each. Lighter pistons can improve engine response and reduce inertia, which is beneficial for high RPM applications. However, ensure your engine is balanced with the full rotating assembly to maintain reliability.
What type of wrist pins are included with the SC7405 pistons?
The SC7405 pistons come with standard wrist pins (part number 866-2250-15CP1C) included at no additional cost. For higher performance needs, you can upgrade to heavier duty pins if required, but confirm compatibility with your setup.
