CP Pistons is one of the most trusted names in the industry, and for good reason. Their extensive shelf catalog provides the user with many of the options that you'd normally be resigned to going to a custom piston for. Their standard offering already includes Dual Pin Oilers - providing double the amount of oil to the wrist pin, radiused valve relifs, and the pin fitting final hone on the wrist pin bore. They even include an Accumulator Groove as a standard option. This provides a small pocket for the combustion gasses to collect after the first ring, reducing ring flutter and providing a better seal allowing more downward force on the piston A.K.A. - make more power.
All pistons come balanced within one gram, include pin lock grooves and wrist pins at no additional charge.
CP Standard Shelf Pistons
Features
Dedicated forgings
Balanced to + or - 1 gram
Wrist pins provided at no cost
Pin fitting provided at no cost
Accumulator Grooves
Dual forced pin oilers
Pick lock grooves
Fully CNC machined
USA Made
Pistons come with wrist pins, pin fitted, and locks (except for Subaru).
CAM AND BARREL
The Cam is the shape around the skirt of the piston and the barrel is the shape from under the oil ring to the bottom of the skirt. Extensive research and development has been done to find the optimum skirt shape for each piston. These shapes have been found to seal up cylinders and reduce harmonics in the bore better than ever before. Depending on the forging and application, different cam and barrel profiles are utilized for maximum performance. Having the correect cam and barrel on a part promotes the following:
1. Tighter clearances
2. Less noise
3. Better ring seal
4. More power
5. Increased durability
ANTI DETONATION GROOVES (CONTACT REDUCTION GROOVES)
Also know as contact reduction grooves, which limit the piston/cylinder contact during high temperature and high RPM. These grooves also protect the top ring by disrupting detonation waves.
ACCUMULATOR GROOVE
V-shaped groove machined in the 2nd ring land that adds to the volume between the top and second ring. This groove accumulates residual gasses from combustion which alleviates top ring flutter and premature second ring wear, improving ring seal.
DOUBLE PIN OILERS
Double Pin Oilers (opposed to single pin oilers), in conjunction with our annular reservoir, can add twice the amount of oil from the cylinder wall to the wristpin bore. This is a standard option on any piston that receives forced pin oiling.
BROACHES
Broaches are horizontal slots in the pinbore designed to allow oil to enter between the wristpin and pinbore. Broaches are also used to accommodate the wristpin shape under compression, as it can become somewhat oval and needs room in order to alleviate galling.
PIN FITTING
The pin bore is precision honed to attain an exact pin clearance. Depending on the application clearances typically range from .0003 to as much as .003 between the wristpin and pin bore.
(CP Pistons 8472 vs 7472)
The CP Pistons 8472 and CP Pistons 7472 are very closely matched in terms of compression ratio, making either option suitable for both 1JZ and 2JZ performance builds.
On 2JZ applications, both piston sets deliver a 10.0:1 compression ratio.
On 1JZ applications, both are designed around a 9.0:1 compression ratio.
What’s the Difference?
The main distinction is in the piston construction and strength.
CP 8472 – Heavy Duty Design
The CP 8472 is engineered as a more robust, heavy-duty piston with:
Thicker ring lands for improved durability under high boost
Revised ring package design
Stronger wrist pin
Overall beefier piston construction for increased power handling
This makes the 8472 the preferred choice for high-horsepower, high-boost, or motorsport-oriented builds where additional strength and reliability are required.
CP 7472 – Proven Performance Option
The CP 7472 remains an excellent performance piston and shares the same target compression ratio as the 8472. It uses a slightly different crown and valve relief design, but is still perfectly suited for serious street and performance applications.
Crown Volume & Compression
8472 crown volume: -2.5cc
7472 crown volume: -4.5cc
The 2cc difference is largely accounted for by the valve relief design, meaning the real-world change in compression and combustion characteristics is minimal. Both pistons maintain the intended compression ratios and will work correctly in their respective 1JZ/2JZ applications.
Which One Should You Choose?
Choose the CP 7472 for a strong, proven performance piston suited to most street and moderate-power builds.
Choose the CP 8472 if you want additional durability and headroom for high-boost, high-power, or competition use.
In short: both pistons offer the same compression ratio and fitment, but the CP 8472 provides a stronger, more heavy-duty design with only a minimal 2cc crown-volume difference.
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