We don’t keep STD bore pistons in stock and if you order these in we will not exchange or accept returns.
STD bore size pistons are not recommended in a used bore for any performance engine unless re-sleeving the block back to std bore size. All piston manufacturers have a specific piston to bore clearance that they recommend. When using a used std bore there is already wear in the bore, hence the manufacturers piston to bore clearance cannot generally be met due to the existing wear in the used bore, especially after honing the used bore. Excessive piston to bore clearance tends to cause early and excessive blow by issues.
Most piston manufactures recommend going to the first oversize and having the cylinder block bored to suit the new pistons with the recommended piston to bore clearance.
More Information
Product Name
CP Pistons RB25DET
Brands
CP Carrillo
Engine
RB25
Make
Nissan
Delivery & Freight
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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 is the recommended bore size for CP Pistons in the RB25DET?
CP Pistons for the RB25DET are available in several bore sizes: 86mm (STD), 86.5mm (+0.5mm), and 87mm (+1mm). It is crucial to note that STD bore pistons are not recommended for use in a worn bore unless the block is re-sleeved to the standard size.
What compression ratios are available for these pistons?
These CP Pistons come in two compression ratios: 9.0:1 and 8.5:1. Ensure you select the appropriate compression ratio based on your engine's tuning and intended use.
Why are STD bore pistons not recommended for used bores?
Using STD bore pistons in a used bore can lead to excessive piston to bore clearance due to wear, which may cause early blow-by issues. It is advisable to use the first oversize and bore the block accordingly to achieve the recommended piston to bore clearance.
What should I consider when installing these pistons?
When installing CP Pistons, ensure that the cylinder block is bored to the correct size for the selected piston. Additionally, follow the manufacturer's specifications for piston to bore clearance and ring gap settings to ensure optimal performance and reliability.
Are there any specific machining requirements for these pistons?
Yes, proper machining is essential. The cylinder bores must be honed to match the selected piston size, and attention should be given to achieving the correct piston to bore clearance as recommended by CP Carrillo to avoid performance issues.
