CP Carillo Forged Pistons for CP Carillo Forged Pistons for Nissan 86mm Bore, RB30/26 Compression Ratio 8.0:1, RB30/25 Compression Ratio 8.25:1 (CP Pistons SC7301)
Make
Nissan
Model
RB30/RB26DETT
Part Number
SC7301
Cylinders
6
Bore (in)
3.386
Bore (mm)
86
Size
STD
Stroke
85
Conrod
152.5
Comp Height (in)
1.28
Comp Height (mm)
32.5
Dom/Dish CC
0
Compression Ratio
8.2 FT
Weight (Grams)
334
Pin (mm)
21
Rings
CPN-3386
Ring Thickness
1.0 x 1.2 x 2.8mm
Pin included (Standard)
827-2250-20CP1C
Upgraded Pin
827-2250-20CP3C
Ultra Duty Pin
827-2250-25CP3C
Locks
827x063 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.
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
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 compression ratio do these pistons provide for RB30 engines?
The SC7301 pistons offer a compression ratio of 8.0:1 for RB30/26 engines and 8.25:1 for RB30/25 engines. Ensure your engine's setup is compatible with these ratios for optimal performance.
What is the recommended bore clearance for these pistons?
Bore clearance should be set according to the specific engine build and application. Typically, a clearance of 0.0025" to 0.0035" is common for forged pistons, but always verify with your engine builder for the best fit.
Do I need to modify my engine for these pistons?
These pistons feature deep valve reliefs designed to accommodate high lift camshafts and oversized valves. However, you should confirm compatibility with your specific camshaft and valve setup to avoid interference.
What type of wrist pins are included with the SC7301 pistons?
The SC7301 pistons come with standard wrist pins (part number 827-2250-20CP1C) included at no additional cost. Upgraded and ultra-duty pins are also available if you require additional strength.
How are these pistons balanced?
CP pistons are fully CNC machined and balanced to within +/- 1 gram, ensuring consistency and reliability in performance. It's still advisable to balance the entire rotating assembly for optimal engine performance.
